Siemens Az S350 U

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System Description

Az S 350 U

Microcomputer Axle Counting System

(Amended for use on Indian Railways)

Date of Amendment: 7th November 2006

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Confidentiality: None Issuing department: TS RA SD 7 Author of German document Springorum TS RA SD 73 Translation released by Argiel TS RA SD 75 2004-09-30 sgd. Argiel Translation checked by Dawson TS RA SD 75 2004-09-29 sgd. Dawson Translation prepared by Argiel TS RA SD 75 2004-09-28 sgd. Argiel

Name Department Date Signature

For the original signatures see Verification Record with the number M0110340606,A.

Note

The contents of this translation correspond to the German document with the number M0110044940,B.

The text following this symbol indicates changes / adaptation of the document for use on Indian Railways to achieve the suppression of trolley wheels, rail dolly, motor trolley, etc.

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1 Introduction

The safety of rail operations is based on the safety of many individual

components. This is ensured by the use of signalling and safety systems and devices that interoperate smoothly.

Track vacancy detection systems provide reliable information on the clear and occupied states of track sections and thus make a decisive contribution towards virtually trouble-free operation.

This System Description describes the Az S 350 U microcomputer axle counting system from Siemens (referred to as Az S 350 U in the following). The microcomputer axle counting system offers outstanding

cost-effectiveness, compactness and easy extendibility of functions.

It provides a universal interface for connection to any interlocking system. The interface is a parallel interface using floating relay contact outputs and

optocoupler inputs.

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1.1 Principle of Track Vacancy Detection

Automatic track vacancy detection systems provide continuous and reliable information on the clear and occupied states of points, crossings or track sections and supply the necessary output information in the form of binary-coded electric signals (yes / no statements). There are different track vacancy detection systems in use for vacancy / occupancy detection on railway lines. The decision on which is the most efficient system in a special case depends on technical and economic criteria.

Technical criteria of decisive importance are the topography of the track (e.g. the number of track vacancy detection sections to be established, length of the sections) and the state of the track (e.g. ballast, insulating capacity of the permanent way, type of sleeper).

There are two different technical systems in use:

· Track circuits

Track circuits transmit electric energy from a transmitter to a receiver via the two insulated rails of a track section. While current is flowing (i.e. if no train uses the track section), a track section is indicated as being clear. If the track section is occupied or used by a train, the circuit is short-circuited via the vehicle axles and the current does not reach the receiver.

· Axle counting systems

Axle counting systems are based on the principle of axle counting. There are counting heads at the beginning and end of each track section to be detected. These units are connected to an evaluation computer which processes the information generated by the counting heads. If the number of axles counted in matches that counted out, the respective track section is indicated as being clear. Axle counting systems can be used for points, crossings and station and open-line tracks.

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1.2 Principle of Axle Counting

Axle counting systems are based on the principle illustrated below:

ZP 43 wheel detection equipment (double wheel detector

and TCB incl. cable) TCB

Evaluation computer

Generates axle counting data from WDE signals, compares axle counting results and issues a track clear or occupied indication

TCB

TCB = Trackside connection box WDE = Wheel detection equipment TVDS = Track vacancy detection section

TVDS

Outdoor equipment

Indoor equipment

ZP 43 wheel detection equipment (double wheel detector

and TCB incl. cable)

Fig. 1 Principle of axle counting

Az S 350 U is employed for the automatic detection of open-line tracks (block sections) and station tracks (routes). The clear and occupied states of track vacancy detection sections (TVDS) and points are detected.

Az S 350 U includes ZP 43 wheel detection equipment (counting heads). The counting heads are installed at the limits of a track vacancy detection section. Each counting head comprises a double wheel detector (two transmitter and two receiver sections) and a trackside connection box which together form a single functional unit. Any wheels using the track section are detected by the double wheel detector mounted on a rail.

The evaluation computer

· evaluates the signals transmitted from the counting heads,

· compares the number of axles counted into a track vacancy detection

section with the number of axles counted out,

· monitors the track vacancy detection sections and generates a track clear or occupied indication.

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Compared with track vacancy detection via track circuits, the use of an axle counting system permits the detection of much larger track sections.

Az S 350 U can also be used for track vacancy detection on lines where trains come to a halt. The evaluation computer is able to identify axles oscillating over a double wheel detector, thus avoiding any counting errors.

1.3 Wheel Detection Equipment

Key:

DEK 43 = Double wheel detector Rx1, Rx2 = Receivers

T = Transformer

TCB = Trackside connection box Tx1, Tx2 = Transmitters Rx1 Rx2 VDC VDC VDC Vf1 f2 V Evaluation computer DEK 43 DC DC T Generator 43 kHz Voltage converter f1 f2 ZP 43 Signalling cable, paired or star-quad Connecting cables V f Receiving amplifier Filter Amplifier Rectifier Voltage-frequency converter Band-pass filter TCB V f Tx1 Tx2 VDC = Supply voltage Vf1 = Signal voltage f1 Vf2 = Signal voltage f2

ZP 43 = Wheel detection equipment

Fig. 2 Block diagram of the ZP 43 wheel detection equipment

The ZP 43 wheel detection equipment operates according to the proven method of electromagnetic wheel detection. When a wheel enters the sensing range of the double wheel detector, it modifies the strength of the alternating electromagnetic field, thereby generating pulses. These pulses are transmitted via cable to the evaluation computer located in the interlocking.

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When a wheel enters the sensing range of the double wheel detector, the magnetic coupling between the transmitter and receiver increases.

Consequently, the induced voltage in the receiving coil increases. The receive voltages are transmitted via the connecting cable to the two receiving

amplifiers in the trackside connection box. After filtering, the amplitude of the interference-free receive signals is raised to the appropriate level in the downstream amplifier and the signals are rectified.

Up to this point, both channels operate identically. The voltage-frequency converter generates a square-wave voltage whose frequency depends on the amplitude of the rectified receive voltages. The downstream band-pass filters only let the fundamental wave of this square-wave voltage pass. This

corresponds to the idle state of the system (no wheel within the sensing range of the double wheel detector).

If a wheel enters the sensing range of the double wheel detector, the increased magnetic coupling between transmitter and receiver makes the receive voltage rise above the quiescent voltage (voltage when no wheels are passing). The voltage-frequency converter reacts by increasing the frequency beyond the upper band limit of the band-pass filter. The band-pass filter attenuates the signal. This corresponds to the occupied state of the double wheel detector.

The subsequent transformer combines the signals of both channels and feeds them into the signalling cable. In addition, the transformer separates the supply voltage received from the interlocking from the signals to be transmitted to the evaluation computer.

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1.4 Data Flow between Components

Digital double usage M o d e m M o d e m F A S I T Az S 350 U Indoor equipment Outdoor equipment Az S 350 U Az S 350 U Az S (M) 350 B, Az S (M) 350 M or Az S 350 U

AzGrH = Auxiliary axle count reset button AzGrT = Axle count reset button CH = Counting head

FASIT = Fail-safe single-channel transmission of status information R = Section with remote counting heads (via FASIT) vAzGrT = Preparatory axle count reset button

BLEA12 board BLEA12 board F A S I T BLEA12 board OUTPUTS

Clear / occupied indications (Cl, ¬Cl), reset restriction (RR), reset acknowledgement (RA),

user-defined information (e.g. block information)

INPUTS

Axle count reset (AzGrT + AzGrH, vAzGrT),

user-defined information (e.g block information) Interlocking

Null modem cable < 15 m (optional)

SIRIUS2 board SIRIUS2

board

Data transmission via null modem cable £ 30 m

F A S I T Cable £ 12 m (TTL level) Az S 350 U or Az S (M) 350 T max. CH 5 max. CH 5 SIRIUS2 board max. CH 5 max. CH 5 SIRIUS2 board Service PC M o d e m M o d e m max. CH 5 R R R R R R R R M o d e m

Remote data transmission Remote data transmission

Fig. 3 Data flow between components

Az S 350 U transmits the track vacancy detection section data to the

interlocking circuits via a parallel interface. Information is transmitted via the BLEA12 board (block input / output board). The process uses floating relay contacts and optocouplers for information input and output.

In addition to the dual-channel track clear / occupied indications (CI, ¬CI), a single-channel reset restriction (RR) and reset acknowledgement (RA) are issued for each track vacancy detection section.

The process data (passage of a wheel) is collected by the ZP 43 wheel detection equipment, evaluated and transmitted to the VESBA board at two signal frequencies (amplitude and frequency – f1, f2).

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In the interlocking, a dual-channel reset is issued via the AzGrT or vAzGrT reset procedure. There is an optional auxiliary axle count reset button (AzGrH) connected via two channels, which, on dual-channel activation, cancels the reset restriction. By means of single-channel activation of the AzGrH button, various statistical and diagnostic functions can be called up.

User-defined binary-coded data can be exchanged between systems. This data (e.g. block information) is transmitted from one evaluation computer (EC) to another in transparent form, i.e. there is no evaluation by the respective axle counting system. Information input / output is performed via the BLEA12 board.

The FASIT data transmission procedure (fail-safe single-channel transmission of status information) provides the connection between the Az S 350 U

systems. The transmission software enables the exchange of safety-related status information between the communication partners. Information is exchanged regularly and in both directions.

The FASIT data transmission method connects the Az S 350 U systems via a modem link (any length, restricted only by transmission medium). Over a shorter distance, two Az S 350 U systems may also be connected via a cable

(£ 15 m) without modem. The evaluation computer is connected via the

SIRIUS2 board.

Each Az S 350 U evaluation computer is equipped with a SIRIUS2 (serial computer interface universal) board with two V.24 interfaces for remote data transmission between evaluation computers.

When the double-usage function is used, the WDE data of a counting head can be processed by more than one evaluation computer. There are two types of double usage: analogue double usage and digital double usage.

A service PC can be connected to the indoor equipment. Data is transmitted via the V.24 interface of the SIRIUS2 board. The connection is established via modem or, as an option, via a null modem cable (£ 15 m).

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2 System Overview

Az S 350 U from Siemens Transportation Systems meets the highly demanding requirements of many main-line and mass transit operators regarding safety, reliability and economic efficiency.

Az S 350 U has been designed for main-line, regional and industrial railways as well as light-rail transport systems and offers outstanding

cost-effectiveness, compactness and easy extendibility of functions. It can be used:

· on main and secondary lines and in station areas

· on single- and multiple-track lines

· on lines with and without a block system

· with all types of traction and all common vehicle types

· on track sections of any length

· for speeds of up to 400 kph

2.1 Connection to Any Type of Interlocking

Az S 350 U provides a universal interface for connection to any interlocking system. All inputs and outputs to and from the interlocking circuits are done via a parallel interface using floating relay contact outputs and optocoupler inputs. Az S 350 U transmits the data of the track vacancy detection sections (TVDS) to the interlocking circuits. Information is transmitted via the BLEA12 board (block input / output board).

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2.2 Flexible Configuration

CH 2

AzGrH Auxiliary axle count reset button AzGrT Axle count reset button CH Counting head

Cl Clear / occupied indication RA Reset acknowledgement RR Reset restriction

TVDS Track vacancy detection section vAzGrT Preparatory axle count reset button ZP 3 TVDS A Az S 350 U TVDS D TVDS B TVDS C (B) AzGrT, AzGrH (A)

Cl, RR, RA (A) vAzGrT (A) (C) (D) CH 3 CH 1 CH 4 CH 5 TVDS A _{TVDS B} TVDS C _{TVDS D}

Fig. 4 Configuration with one computer

One of the key features of the Az S 350 U evaluation computer is its ability to process the signals of up to five directly connected ZP 43 counting heads. Up to four track vacancy detection sections per evaluation computer can be detected.

AzGrH Auxiliary axle count reset button AzGrT Axle count reset button CH Counting head Cl Clear / occupied indication EC Evaluation computer RA Reset acknowledgement RR Reset restriction TVDS Track vacancy detection section vAzGrT Preparatory axle count reset button

SIRIUS2 SIRIUS2

SIRIUS2

Remote data transmission M o d e m M o d e m CH 2 ZP 3 TVDS C TVDS F TVDS D TVDS E CH 3 CH 1 CH 5 TVDS B CH 1

AzGrT, AzGrH (A) Cl, RR, RA (A) vAzGrT (A) CH 2 CH 3 CH 3 TVDS A TVDS D TVDS C TVDS E TVDS G

Data transmission (max. length £ 15 m)

TVDS F (Extension) M o d e m (Extension) Example: CH 2 is a "remote" CH of EC 2 EC 2 TVDS A GFM G TVDS B TVDS C EC 1 TVDS G GFM G GFM D GFM E EC 3 CH 4 CH 1 CH 2

£ 18 items of information each (e.g. block information)

Fig. 5 Configuration of an overall system consisting of more than one computer

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Each Az S 350 U can be connected to two other evaluation computers via two serial V.24 interfaces (SIRIUS2 board). The WDE data of up to six “remote” counting heads can be evaluated by interconnecting evaluation computers. “Remote” counting heads are counting heads whose data is transmitted via the serial interfaces of the “adjacent” evaluation computers.

For data transmission (without modem), the evaluation computer is connected to its “left-hand” and “right-hand” partners using front connectors. When using modems (remote data transmission), the track vacancy detection section length is unlimited. This permits very long track vacancy detection sections to be detected.

By configuring three evaluation computers to form an axle counting system, the signals of up to 15 counting heads can be evaluated in one evaluation computer and up to 12 track vacancy detection sections can be detected.

M o d e m (Extension) M o d e m M o d e m M o d e m M o d e m M o d e m (Extension) M o d e m M o d e m Az S 350 U Az S 350 U Az S 350 U Az S 350 U CH 5 CH 1 CH 1 CH 5 CH 1 CH 5 CH 1 CH 5

Fig. 6 Cascading of Az S 350 U systems

Any number of Az S 350 U systems can be linked by cascading. This permits the evaluation of information from direct neighbours.

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2.3 Procedure-protected Data Transmission

Two Az S 350 U evaluation computers can be linked via the modem

connected to each computer (serial V.24 interface). The modem-to-modem connection may be implemented via a copper cable, fibre-optic cable or radio-relay system.

Data is exchanged between the modem-connected axle counting systems via the FASIT method.

The single-channel bidirectional point-to-point connection allows status information to be transmitted between both evaluation computers. The status data is transmitted in the form of telegrams at a transmission rate of

9,600 bit/s or 1,200 bit/s and is protected by a 64 bit error detection suffix (Hamming distance 9).

WDE signals and operator-specific, binary-coded data (user-defined, e.g. block information) as well as status information are transmitted using the FASIT procedure.

The behaviour of Az S 350 U for a broken connection is configurable. Either the track section information can be updated or a permanent track occupied indication can be issued on the restoration of data transmission. In the event of a permanent occupied indication, the section must be cleared by an AzGrT operation.

In closed transmission systems, the FASIT procedure can be used without any restrictions. EN 50159-1 specifications for operator-provided closed

transmission systems rule out the possibility of non-authorised access to the transmission system.

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2.4 Double Usage of Counting Heads

When using the double-usage function, the WDE signals of one counting head are jointly used by two adjacent evaluation computers. This function results in fewer counting heads, ensuring at the same time continuous track vacancy detection.

There are three types of double usage:

· analogue double usage

· digital double usage

· double usage via SIRIUS2 board

Analogue double usage

The connection of a counting head (outdoor equipment) to two evaluation computers (indoor equipment) is called analogue double usage. A

supplementary board in the trackside connection box of the counting head permits the analogue WDE signals to be transmitted to both evaluation

computers. An additional cable is required between the counting head and the second evaluation computer.

Digital double usage

For digital double usage of a counting head (outdoor equipment), digitised WDE signals are transmitted between two interconnected evaluation

computers (indoor equipment). By interconnecting evaluation computers, the signals of a counting head can also be used by a second evaluation computer. No additional cabling between indoor and outdoor equipment is required for this multiple usage of WDE signals.

The following evaluation computers can be interconnected for digital double usage:

Sending EC Receiving EC Remark

Az S 350 U Az S 350 U Via internal connector 22

(Az S 350 U)

Az S 350 U Az S (M) 350

Version B Az S (M) 350

Version M

Via internal connector 22 (Az S 350 U)

or

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Az S (M) 350 Version B Az S 350 B1 Az S 350 B5

Az S 350 U Via DIGIDO board

(optional) Az S (M) 350 Version M

Az S (M) 350

Az S 350 U Not possible, as the sending

systems do not generate test pulses

Digital double usage is implemented by connecting a “sending evaluation computer” to a “receiving evaluation computer”. The evaluation computer to which the counting heads are directly connected and which transmits the WDE signals to the receiving evaluation computer is called the “sending evaluation computer”. The “receiving evaluation computer” evaluates the digital WDE signals transmitted by the “sending evaluation computer”.

TVDS

B

CH 1

AzGrT, AzGrH (A) Cl, RR, RA (A) vAzGrT (A) TVDS A _{TVDS B} Length £ 12 m 2 CH 2 TVDS A

CH 2 is jointly used (signal as TTL level)

CH 3 CH 5 CH 4 CH 3 CH 4 CH 2 CH 1

Three further CH possible (max. 5 CH can be connected) Connector 20 Connector 22 Az S 350 U (sending) Connector 22 Az S 350 U

(receiving) Connection of CH 5 via digital double-usage function; 5th VESBA board is not required!

2nd VESBA 5thVESBA

CH 5

Three further CH possible (max. 4 CH can be connected)

Fig. 7 Digital double usage between two Az S 350 U

The counting heads are connected to the “sending evaluation computer” via internal connector 20. Five counting heads can be directly connected to the “sending evaluation computer”. The “sending evaluation computer” and the “receiving evaluation computer” are interconnected using internal connector 22. As an option, the evaluation computers can also be interconnected via the DIGIDO board (see table above). When using the double-usage function, the number of counting heads that can be directly connected to the “receiving evaluation computer” is lower. If, for example, one counting head is jointly used, only a maximum of four counting heads can be directly connected to the “receiving evaluation computer“. This, however, also reduces the number of VESBA boards required. The WDE signals are transmitted at TTL level using a two-core shielded cable (£ 12 m).

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Double usage via SIRIUS2 board

WDE signals can also be jointly used by connecting two evaluation computers via a SIRIUS2 board (V.24 interfaces). In addition to the WDE data of up to five directly connected counting heads, this mode of connection permits the WDE information of up to six counting heads of an adjacent evaluation computer to be also used.

2.5 Transmission of Operator-specific Information

In addition to WDE and TVDS data, Az S 350 U is able to transmit binary-coded data (operator-specific data, user-defined, e.g. block information) in both directions.

The input and output of binary-coded data is performed via the BLEA12 board. If the outputs are not required for track vacancy detection sections, a

maximum of 12 user-defined, operator-specific items of information can be transmitted (first pair of BLEA12 boards).

If fitted with the maximum possible number of boards (optional second pair of BLEA12 boards), Az S 350 U can transmit up to 24 user-defined binary-coded data items (input / output), provided that no outputs are required for track vacancy detection sections.

The table below shows the number of user-defined operator-specific items of information possible (with the optional second pair of BLEA12 boards

inserted):

Quantity First pair of BLEA12

boards

Second pair of BLEA12 boards (optional)

Use of two pairs of BLEA12 boards

Track vacancy detection sections

Total number of user-defined items of

information

Additional user-defined items of information

Total number of user-defined items of information

0 12* 12 24*

1 10 12 22

2 8 12 20

3 6 12 18

4 4 12 16

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The information is read in via floating optocoupler inputs and output via floating relay contacts.

In an overall evaluation computer system, operator-specific information is transmitted bidirectionally.

2.6 System Compatibility

Az S 350 U is functionally compatible with the following axle counting systems:

· Az S 350 U

· Az S (M) 350 Version B

· Az S (M) 350 Version M

· Az S 350 B1

· Az S 350 B5

An Az S 350 U evaluation computer is connected to another Az S 350 U evaluation computer using internal connector 22. Az S (M) 350 Version B / M is connected to the Az S 350 U evaluation computer via either internal connector 22 or the DIGIDO board. The Az S (M) 350 Version B and

Az S 350 B1 / B5 axle counting systems can be connected to the Az S 350 U evaluation computer using the DIGIDO board only.

The redundant reset function of Az S (M) 350 Version B is also implemented in Az S 350 U. This compatibility permits the replacement of Az S (M) 350 Version B by Az S 350 U.

Az S 350 U also provides a redundant track clear indication output and reset option for a second (additional) interlocking.

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2.7 Fail-safety

Channel 1

Process data input

Processor and memory Synchro-nisation Processor and memory Synchro-nisation Data ex-change Data ex-change Compa-rison Compa-rison Output Output Input Input Channel 2 Micro-computer A Micro-computer B

Fig. 8 SIMIS 2-out-of-2 configuration

Az S 350 U is operated as a fail-safe computer in a 2-out-of-2 configuration on

the basis of the proven SIMIS® fail-safe microcomputer system from Siemens.

This microcomputer system has been specially developed for all tasks involving fail-safety issues, as they are required, for example, in railway signalling systems. It checks all safety-related indications and processes them using two channels.

The SIMIS fail-safe microcomputer system from Siemens comprises two independent microcomputers of identical structure. The microcomputers are supplied with the same input information which, because they run the same programs, process in an identical manner thus generating the desired output information on two channels.

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Only if the output information is the same in the two independent comparators is it output to the follow-on circuitry. A cut-off unit is connected downstream of the comparators for this purpose and de-energises the output circuits if the output data does not agree.

The SIMIS system includes test programs which ensure in-time failure detection. The SIMIS on-line test program, SOPP, is a background program with low priority. It is interrupted by an interrupt for processing. SOPP is responsible for continuously checking all SIMIS functions on a channel-by-channel basis.

The system's safety is based on the fact that the dual-channel SIMIS principle is applied to all safety-related subsystems.

2.8 Easy Configuring

DIP (dual in-line package) configuration switches allow Az S 350 U to be flexibly configured, providing a wide range of applications. The DIP switches are located on the BLEA12 board.

The functions of the set DIP switches are determined by the software of the axle counting system. During computer start-up, the system reads the DIP switch positions and performs a plausibility check. If the plausibility check fails, the evaluation computer adopts a safe state.

The DIP switches can also be used to perform modifications during operation (e.g. when modifying or extending the system) rapidly and at low cost.

The DIP switches provide the following configuration options for example:

· setting of system parameters, such as data transmission and oscillation behaviour

· output of track clear and occupied indications (Cl and ¬Cl) of up to four detected track vacancy detection sections with additional output of reset restriction (RR) and reset acknowledgement (RA)

· configuring of direction information

· input of immediate or preparatory axle count reset (by actuating the AzGrT or vAzGrT button) per evaluation computer

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2.9 Multiple-axle Counting Method

The multiple-axle counting method evaluates batches of several axles, thus being less susceptible to faults.

The multiple-axle counting method permits trains to pass at a speed of up to vmax = 400 kph with wheel diameters of d ³ 865 mm.

With the multiple-axle counting method, the evaluation of more than one axle at a time improves interference suppression and increases the availability of Az S 350 U.

2.10 Reset Options

Axle counting systems must allow reset of a track vacancy detection section to the clear state.

Two methods are used for resetting the system:

· immediate axle count reset

· preparatory axle count reset

With immediate axle count reset, the track vacancy detection section is immediately indicated as being clear after the axle count reset button (AzGrT) has been pressed, provided that no reset restriction (RR) is active. A reset restriction is active if the last axle registered by the axle counting system has been ‘counted in’. If a reset restriction is active, operation of the AzGrT button has no effect. The reset restriction can be cancelled by a relief operator action using the auxiliary axle count reset button (AzGrH). Subsequently, the track can be given a clear indication by pressing the AzGrT button. Actuation of the AzGrT button must be preceded by track clear proving. The respective

procedure is to be specified in the operator regulations.

With preparatory axle count reset, the track vacancy detection section in question is not immediately indicated as being clear after pressing the

preparatory axle count reset button (vAzGrT). It only causes the axle count of the track vacancy detection section to be reset to 'zero'. A clear indication is issued only after the track vacancy detection section has been subsequently passed by a train. The passage of the train must comply with the relevant railway operator’s regulations.

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The following can be configured for the preparatory axle count reset:

· After an axle count reset operation, the train must pass at least two different counting heads in order to establish the clear status for the respective section.

· After an axle count reset operation, the train must pass all counting heads at the beginning and end of the track vacancy detection section in order to establish the clear status for the respective section. This may involve several individual train passages.

· After an axle count reset operation, the train must pass all counting heads passed during the last train passage in order to establish the clear status for the respective section.

Outputs per TVDS Channel 1 Channel 2 Channel 2 Channel 1 Az S 350 U Fail-safe output: clear indication (Cl) Fail-safe output: occupied indication (¬Cl) Non-fail-safe output: reset acknow-ledgement (RA) Non-fail-safe output: reset restriction (RR) Single-channel Dual-channel Single-channel

User-defined binary-coded information, e.g. block information (operator-specific)

AzGrT only

(not for vAzGrT)

Inputs per TVDS Dual-channel Channel 1 Channel 2 Channel 2 Channel 1 Dual-channel Az S 350 U AzGrH (can cancel RR) AzGrH (can cancel RR) Fail-safe input: AzGrT or vAzGrT User-defined binary-coded information, e.g. block information (operator-specific)

Fail-safe input:

AzGrT

or

vAzGrT

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In addition to the fail-safe, dual-channel output of clear or occupied indications, AzGrT or vAzGrT operation is input, for each track vacancy detection section, in a fail-safe manner via two channels. The AzGrT or vAzGrT button is electrically isolated from the computer core via floating optocoupler inputs on the BLEA12 board. As different applications use

different operating voltages, there is a wide range of possible input voltages. If neither of the AzGrT and vAzGrT buttons are pressed, the input has to be voltage-free. If one of the buttons is pressed, the output directed towards the computer system makes the voltage rise from 0 V to +5 V. Az S 350 U

provides terminals for the axle count reset buttons. The operator must connect these terminals to the interlocking circuits.

The operator may also request an output about track vacancy detection section resettability to be generated (reset restriction active?). For each of the max. four track vacancy detection sections to be detected by the evaluation computer, a non-fail-safe relay output for the reset restriction can be provided (not with vAzGrT). Cancellation of the reset restriction by means of a dual-channel operation of the AzGrH button can also be provided.

The operator has the option to output information on whether the AzGrT or vAzGrT button has been operated successfully. Pressing the axle count reset buttons triggers a reset acknowledgement. Az S 350 U acknowledges the reset operation and this reset acknowledgement is indicated in the

interlocking. As the reset acknowledgement is non-vital, it is provided on a single-channel basis (channel 1) as a freely connectable relay contact. The output is permanently through-connected and is only interrupted during AzGrT or vAzGrT operation. The reset acknowledgement is available for each track vacancy detection section to be detected.

As this information is only used for indication purposes, it is provided by the BLEA12 board on a single-channel basis. The corresponding output signal switches a freely connectable floating relay contact on channel 2. This contact may be open or closed (both variants possible) as long as there is a reset restriction in the Az S 350 U system.

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2.11 Flexible Power Supply

Az S 350 U can be flexibly adapted to the existing power supply system due to a large input voltage range from 24 V DC to 60 V DC. The SVK2150 power supply board generates the following operating voltages required by

Az S 350 U:

· 5 V DC for internal operation

· 70 V DC for external operation of max. five counting heads

As an option, the counting heads can be supplied with power directly from an on-site voltage source via an additional band-pass filter board for external supply (in the ZP 43 wheel detection equipment).

2.12 Maintenance

As the hardware components used are highly reliable, the system requires only little maintenance.

The front panels of the boards are fitted with light-emitting diodes (LEDs) indicating the status or cause of possible faults of the axle counting system. In addition, the LEDs provide statistical information, e.g. the number of track section occupancies or the number of axles having passed a counting head. With its additional service PC, the system enables maintenance activities to be carried out in a most effective manner.

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2.13 Applications

2.13.1 Application Variant with One Counting Head per

Evaluation Computer

ZP 3 CH 1 CH 1ZP 3 TVDS A AzGrT (A) Cl, RR, RA (A) vAzGrT (A)

TVDS A (long track vacancy detection section)

Remote data transmission

M o d e m M o d e m

Az S 350 U

EC 1 _{Az S 350 U}

EC 2 10/22* user-defined inf. 12/24* user-defined inf.

* Number of user-defined items of information when using one pair (left figure) or two pairs (right figure) of BLEA12 boards

Station A Station B

Fig. 10 Application variant with one counting head per evaluation computer for long track vacancy detection sections

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2.13.2 Application Variant with One Track Vacancy Detection

Section and more than One Counting Head

* Number of user-defined items of information when using one pair (left figure) or two pairs (right figure) of BLEA12 boards

CH 2 ZP 3 Az S 350 U CH 3 CH 1 CH 4 CH 5 TVDS A ZP 3 CH 1 TVDS A AzGrT (A) Cl, RR, RA (A) vAzGrT (A) Az S 350 U EC 1 Az S 350 U EC 2

10/22* user-defined inf. 12/24* user-defined inf.

Null modem cable (£ 30 m)

Fig. 11 Application variant with one track vacancy detection section and more than one counting head

2.13.3 Application Variant with Two Track Vacancy Detection

Sections Detected by One Evaluation Computer

ZP 3 CH 1 CH 2ZP 3 Az S 350 U ZP 3 CH 3 TVDS A AzGrT (A) Cl, RR, RA (A) vAzGrT (A) Az S 350 U EC 1 ZP 3 CH 4 TVDS B TVDS A TVDS B

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2.13.4 Application Variant with Two Track Vacancy Detection

Sections (Points) and Jointly Used Counting Head

ZP 3 Az S 350 U CH 1 CH 2 CH 4ZP 3 TVDS A AzGrT (A) Cl, RR, RA (A) vAzGrT (A) Az S 350 U EC 1 CH 3 CH 5ZP 3 TVDS B TVDS A TVDS B

Fig. 13 Application variant with two track vacancy detection sections (points) and jointly used counting head

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3 Structure and Mode of Operation of

Az S 350 U

3.1 System Structure

STEU STEU SIRIUS2 Inputs: AzGrT, vAzGrT; AzGrH Indoor equipment Inter- _locking TVDS A VAU VAU Outputs: Cl, ¬Cl, RR, RA

Inputs and outputs:

user-defined information 3rd BLEA12 1st BLEA12 4th BLEA12 2nd BLEA12 Az S 350 U Other Az S 350 U systems Service PC Outdoor _equipment Via m o d e m

Null modem cable

Optional

AzGrH Auxiliary axle count reset button AzGrT Axle count reset button Cl Track clear / occupied indication RA Reset acknowledgement RR Reset restriction

TVDS Track vacancy detection section vAzGrT Preparatory axle count reset button ZP 43 Wheel detection equipment (counting head) TVDS D

TVDS C TVDS B

ZP 43

1st VESBA 2nd VESBA 3rd VESBA 4th VESBA 5th VESBA

ZP 43 ZP 43 ZP 43 ZP 43 1st BLEA12 pair 2nd BLEA12 pair SIMIS Channel 1 SIMIS Channel 2 Other Az S 350 systems

DIGIDO Internal connector 22

Two-core shielded cable

Fig. 14 Az S 350 U system structure

Az S 350 U consists of two main components:

· outdoor equipment

· indoor equipment

The outdoor equipment is the ZP 43 wheel detection equipment (counting head) comprising a double wheel detector and a trackside connection box. Counting heads are installed at the limits of a track vacancy detection section. The indoor equipment consists of the evaluation computer.

The process data (passage by a wheel) is acquired by the counting head, evaluated and transmitted to the VESBA board of the evaluation computer.

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Following electrical isolation, the VESBA board forwards the WDE data via two independent channels. If the signal exceeds a defined limit after band-pass filtering (this is the case if the counting head is not band-passed – closed-circuit principle), a trigger stage responds and generates a digital "high" signal at the output of this board. In the case of wheel passage or signal failure, a "low" signal is generated.

The STEU control and diagnostic board receives the signal data. It temporarily stores the WDE signals and transfers them to the VAU processing and

monitoring board. The SIMIS C microcomputers process and evaluate the axle counting data and forward the results to the higher-level interlocking circuits via the BLEA12 input / output board (relay outputs).

The SIRIUS2 (serial computer interface universal) board is used to transmit WDE signals between two Az S 350 U.

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3.2 Outdoor Equipment

3.2.1 ZP 43 Wheel Detection Equipment

The ZP 43 wheel detection equipment (counting head) is installed at the limits of a track section. It comprises:

· DEK 43 double wheel detector with connecting cables to the trackside

connection box (approx. 5 m long, optionally 10 m)

· trackside connection box

The ZP 43 wheel detection equipment is connected to the evaluation computer via two wires of a star-quad railway signalling cable. This cable is used to transmit the WDE signals to the evaluation computer and to supply the counting head with power (if it is not supplied from an external voltage

source).

The ZP 43 wheel detection equipment has the following main features:

· detection of all wheels with dimensions conforming to the German Railway

Building and Operation Regulations (EBO)

· compatibility with all common rail profiles

· integration of lightning protection elements

· high mechanical stability

· reliable operation even with very short detection times (train speeds of up to 400 kph for wheel diameters of 865 mm)

· fault-free operation at an ambient temperature range from –40°C to +80°C

as well as under conditions of ice, snow and humidity (including flooding)

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3.2.2 DEK 43 Double Wheel Detector

The DEK 43 double wheel detector (IP68) consists of two electronic sensors. Each sensor has a transmitter and a receiver section. The transmitters and receivers of both sensors are accommodated in one housing each. The transmitter housing is located on the outer side and the receiver housing on the inner side of the rail. In order to reduce interference from the rail, e.g. through traction return currents, the transmitter and receiver are provided with a reducing plate on the side facing the rail. The reducing plate is shaped to match the rail profile and extends from the base of the rail across the web to underneath the rail head. The double wheel detector is attached by means of two mushroom-head screws through centred holes in the neutral zone of the rail web.

3.2.3 Connecting Cables

Shielded connecting cables are used to connect the double wheel detector and the trackside connection box. The connecting cables have a unilateral permanent connection with the parts of the double wheel detector and form a unit. They are approx. 5 m long (alternatively 10 m). This results in maximum distances between the double wheel detector and the trackside connection box of approx. 4.2 m and approx. 9 m respectively.

3.2.4 Trackside Connection Box

Two variants of the trackside connection box are available, variant E (cast-aluminium housing) and V (plastic housing). Both variants of the trackside connection box are air-tight (IP67) and have a removable, lockable cover. For trackside installation, pipe supports of various heights are available. The connection box is equipped with cable glands of various diameters to allow cables to be led into or brought out of the box. A mounting rack is installed in the trackside connection box. The electronic components required for

controlling the double wheel detector and pre-processing the detector information are accommodated on plug-in circuit boards.

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Frequency tuning board

1: Connection for WDE service equipment 2: Lightning protection board (core-to-core) 3: Generator board

4: Band-pass filter board or

band-pass filter board for external supply

Si1 f2 6,52 f1 3,6 0,1 A 5: Supplementary board for WDE double usage

or jumper board

Fig. 15 Board arrangement of ZP 43 E (cast-aluminium housing)

Location Used for Function

1 Plug-in connection for WDE

service equipment

Commissioning and test measurements

2 Lightning protection board or

jumper board (for older counting heads)

Limits overvoltage induced in connecting cable to harmless levels (core-to-core) or replaces lightning protection board (without overvoltage protection)

3 Generator board Transmitting generator, conditioning of signals from

receiver

4 Band-pass filter board (with /

without external supply)

Band-pass filters, power supply

5 Supplementary board Reserve location for boards required for WDE double

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Adjusting control for signal frequency 2 (6.52 kHz) Rotary switch (S1) for transmitter frequency (43 kHz)

Adjusting control for signal frequency 1 (3.60 kHz)

3 4 5

1

1: 3: 4:

Wiring backplane including overvoltage protection and tuning components (core-to-core)

Connection for WDE service equipment Band-pass filter board or band-pass filter board for external supply

Generator board with adjusting controls for signal frequencies

2:

5: Supplementary board for WDE double usage

2

Fig. 16 Board arrangement of ZP 43 V (plastic housing)

Adjusting control for signal frequency 2 (6.37 kHz) Adjusting control for signal frequency 1 (3.50 kHz)

Location Used for Function

1 Backplane (double-layer) Limits overvoltage induced in connecting cable to

harmless levels (core-to-core)

and tuning elements (rotary switch S1) for the 43 kHz transmitter frequency

2 Plug-in connection for WDE

service equipment

Commissioning and test measurements

3 Band-pass filter board (with /

without external supply)

Band-pass filters, power supply

4 Generator board Transmitting generator, conditioning of signals from

receiver

5 Supplementary board Reserve location for boards required for WDE double

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3.2.5 External Power Supply for ZP 43 (Optional)

The wheel detection equipment can also be supplied externally with DC voltage or AC voltage. External supply is required if evaluation computer and wheel detection equipment are a great distance apart. In this case, the wheel detection equipment cannot be supplied via the core pair which carries the WDE signals. Power must be supplied via a second core pair or a different cable. It must be uninterruptible.

3.2.6 Double Usage for ZP 43 (Optional)

Using a supplementary board (mounting location 5) in the trackside

connection box, the analogue WDE signals are provided twice, allowing wheel detection equipment to interoperate with two neighbouring evaluation

computers, i.e. double usage of the wheel detection equipment is possible.

3.2.7 Overvoltage Protection for ZP 43

Some users of axle counting systems have particularly high electromagnetic interference, due to atmospheric conditions, e.g. thunderstorms, and technical conditions, such as traction currents.The overvoltage protection units already available in the wheel detection equipment (overvoltage protection in

connecting cables – core-to-core) can be supplemented by additional overvoltage protection measures (core-to-earth).

When using axle counting systems in regions with frequent thunderstorms, we recommend the installation of an additional core-to-earth overvoltage

protection system. This is also recommended when the cable between counting head and interlocking is very long or the cable is routed above ground. The effectiveness of overvoltage protection depends on a good earth connection and is thus restricted at installation sites with poor earthing

conditions (e.g. rocky ground).

Irrespective of whether or not the additional overvoltage protection system is used, the trackside connection box must always be earthed. Overvoltage protection components are available for both variants of ZP 43 equipment.

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3.2.7.1 Overvoltage Protection for ZP 43 E

Lightning protection module 4 V25131-A1-A282 Mounting rail Block varistor V25131-A1-A403 Retaining clip Basic terminal block C25165-A63-B70 Module holder

Fig. 17 Lightning protection unit for ZP 43 E

The additional lightning protection components are accommodated in the type 4 lightning protection module and the block varistor. The lightning protection modules are plugged onto basic terminal blocks. The entire assembly is called the lightning protection unit. The basic terminal blocks are locked onto a mounting rail which is mounted to a support in the ZP 43 E wheel detection equipment via a module holder. The lightning protection unit can be retrofitted to existing ZP 43 E wheel detection equipment.

The existing cable to the evaluation computer for WDE signal transmission and WDE power supply can be connected to the basic terminal blocks. These terminal blocks are connected to earth or the railway earthing system. If cables for external supply and / or WDE double usage are to be connected, additional lightning protection modules must be provided.

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3.2.7.2 Overvoltage Protection for ZP 43 V

Lightning protection module board

Fig. 18 Lightning protection module board in the ZP 43 V trackside connection box

The lightning protection elements are accommodated on an additional lightning protection module board. The board is attached to the rear of the wiring backplane in the ZP 43 V trackside connection box. The lightning protection module boards can be retrofitted to existing ZP 43 V wheel detection equipment.

The cables to the evaluation computer for WDE signal transmission and WDE power supply as well as for external supply and / or WDE double usage can be directly connected to the lightning protection module board.

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3.3 Indoor Equipment

The evaluation computer is the heart of the Az S 350 U axle counting system. It consists of the proven SIMIS fail-safe microcomputer system from Siemens which is used in many electronic interlockings. As to safety, Az S 350 U complies with the Technical Principles for the Approval of Safety-related Systems for Signalling (Mü 8004) of the German Federal Railways Office (EBA) and is provided with an EBA-authorised safety case.

3.3.1 Az S 350 U Axle Counting Cabinets

The cabinets accommodate the required number of evaluation computer mounting frames (EC MF). Optional components such as ventilator subassemblies, compartment bases and terminal modules are installed

depending on the cabinet type. The cabinet types are listed in the table below:

EC cabinet

Siemens code number S25552-J605-

U1

S25552-J605-

U2

Cabinet type Knürr; type Miracel with

door, side panels (optional)

Knürr; type Miracel with door, side panels (optional) Dimensions

(width x depth x height)

600 x 600 x 2200 mm 600 x 600 x 2200 mm

EC MF (quantity) Max. 6 Max. 9

Ventilator subassembly (quantity) 1 (from 3 EC MF) 1 (from 3 EC MF) 2 (from 6 EC MF) Compartment bases for accessories, optional

(use of compartment bases depends on number of EC

MF)

Possible from < 6 EC MF Possible from < 9 EC MF

Terminals Terminals for WDE

connection

(quantity depends on number of EC MF)

-

Terminal modules (MOKAU)

Terminal blocks for inputs and outputs of BLEA12

(quantity depends on number of EC MF)

-

Terminal strip Connection of supply

voltage, additional units

Connection of supply voltage, additional units Terminal strip

(optional)

- For connecting cable, CH

to intermediate distribution rack

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3.3.2 Axle Counting Cabinet S25552-J605-U1

Fig. 19 Axle counting cabinet S25552-J605-U1

The cabinet type Miracel / 19'' from Knürr corresponding to IEC 297 is used for Az S 350 U. The components such as evaluation computer mounting frames, ventilator subassembly, compartment bases, cabling and terminal strip can be easily installed thanks to a very flexible modular system.

The cabinet can accommodate a maximum of six evaluation computer mounting frames. The SIPAC-Inch modular system is used for board

installation. The SIPAC-Inch modular system has a standardised and flexible design. It complies with the requirements of the current standards of

interlocking and control technology.

A ventilator subassembly is required when using more than two evaluation

computer mounting frames.The mounting frames in the middle of the cabinet

can be replaced with compartment bases to accommodate modems,

multiplexers, etc. The mounting frames and compartment bases to be installed in a cabinet are specified on a project-specific basis.

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The counting heads and BLEA12 boards are connected via terminals located on a mounting plate in the lower part of the cabinet. When installing max. three evaluation computer mounting frames in a cabinet, the plate is mounted in the front area of the cabinet. Two mounting plates are required when installing more than three evaluation computer mounting frames. The second mounting plate is installed at the same level as the first one, but is accessible from the rear of the cabinet.

Connection of counting heads:

Within the cabinet, connecting cables lead from the backplane connectors of the evaluation computer mounting frame to the counting head terminals on the mounting plate. The cable connection to the intermediate distribution rack is made during installation on site.

Connection of BLEA12 boards:

Within the cabinet, connecting cables lead from the front connectors of the BLEA12 boards to terminal blocks (MOKAU). On the MOKAU modules, there are fuse holders for the outputs of the BLEA12 board. The cable connection from the terminal blocks to the intermediate distribution rack is made during installation on site.

The front connectors for connection to the first pair of BLEA12 boards have four optional buttons for connection of the auxiliary axle count reset button (AzGrH) – for each configured track vacancy detection section. The front connectors for the second pair of BLEA 12 boards have no buttons. All modules and cables can be coded and are project-specific.

The terminal strip in the lower part of the cabinet is used to provide the supply voltage for the max. six mounting frames and the additional units (e.g.

ventilators, modems). All cable shields of the connecting cables are connected to cabinet potential using a contact bar on the rear.

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3.3.3 Axle Counting Cabinet S25552-J605-U2

Fig. 20 Axle counting cabinet S25552-J605-U2

The cabinet type Miracel / 19'' from Knürr corresponding to IEC 297 is used for Az S 350 U. The components such as evaluation computer mounting frames, ventilator subassembly, compartment bases, cabling and terminal strip can be easily installed thanks to a very flexible modular system.

The cabinet can accommodate a maximum of nine evaluation computer mounting frames. The SIPAC-Inch modular system is used for board

installation. The SIPAC-Inch modular system has a standardised and flexible design. It complies with the requirements of the current standards of

interlocking and control technology.

A ventilator subassembly is required when using more than two evaluation computer mounting frames, two ventilator subassemblies are required when

using more than five evaluation computer mounting frames.The mounting

frames in the middle of the cabinet can be replaced with compartment bases to accommodate modems, multiplexers, etc. The mounting frames and compartment bases to be installed in a cabinet are specified on a project-specific basis.

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Two variants for connecting counting heads:

The first variant permits connection via cables with backplane connectors directly to the intermediate distribution rack. Ready-made connecting cables of different lengths are provided, which are connected to the intermediate

distribution rack during on-site installation.

For the second variant, the counting head connections are run via an optional terminal strip in the lower part of the cabinet using backplane connectors already during cabinet assembly. The cable connection to the intermediate distribution rack is made cost-effectively during installation on site.

Connection of BLEA12 boards:

Ready-made connecting cables with front connectors in the required cable lengths permit the BLEA12 boards to be directly and cost-effectively

connected to the intermediate distribution rack (different cable variants for the first and the second pair of BLEA12 boards).

The front connectors for connection to the first pair of BLEA12 boards have four optional buttons for connection of the auxiliary axle count reset button (AzGrH) – for each configured track vacancy detection section. The front connectors for the second pair of BLEA 12 boards have no buttons. All modules and cables can be coded and are project-specific.

All cable shields of the connecting cables are connected to cabinet potential using a contact bar on the rear.

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3.3.4 Overview of Boards

Fig. 21 Front view of Az S 350 U evaluation computer (including slot numbers)

The plug-in circuit boards are accommodated in a single-tier mounting frame with wiring backplane. Dummy boards are inserted in free slots for optional boards.

The SIRIUS2 (serial computer interface universal) board enables

communication between the connected evaluation computers. It provides two serial, bidirectional interfaces for data transmission, each equipped with a V.24 output. The SIRIUS2 board is used on one channel only.

All inputs and outputs (CI, ¬CI, AzGrT or vAzGrT, RR, RA, user-defined block information) to and from the interlocking are done via the BLEA12 block input / output board. Two BLEA12 boards (first pair of BLEA12 boards) are required for the dual-channel Az S 350 U, one for channel 1 and one for channel 2. A second, optional pair of BLEA12 boards can be inserted.

Each computer channel has a STEU control and diagnostic board, which evaluates the WDE signals received (counting head- and section-specific data).

The VAU processing and monitoring board, a CPU board, constitutes the fail-safe microcomputer system (SIMIS C computer core). The VAU board provides monitoring and comparator functions for synchronous dual-channel microcomputer operation.

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Each directly connected counting head requires one VESBA amplifier, trigger and band-pass filter board (numbering of counting heads: CH 1 to CH 5). It provides electrical isolation between indoor and outdoor equipment (counting head). The VESBA board splits the signal frequencies f1 and f2 into two independent channels and filters, amplifies, rectifies and evaluates (trigger) the data transmitted from the counting head.

The DIGIDO digital double-usage board is used if WDE information is to be jointly used by two evaluation computers.

The SVK2150 power supply board provides 5 V for the evaluation computer and 70 V for the counting heads.

Az S 350 U consists of the following components:

Quantity Short name Designation Order no.

1 MF Mounting frame S25552-C605-U1

2 VAU* Processing and monitoring board S25552-B600-U1

2 STEU* Control and diagnostic board S25552-B601-B1

2 or 4 BLEA12* Block input / output board S25552-B603-D1

0 or 1 SIRIUS2 Serial computer interface universal board S25395-B171-A3

0 to 5 VESBA Amplifier, trigger and band-pass filter board S25552-B604-C1

0 or 1 DIGIDO Digital double-usage board S25552-B699-U1

1 SVK2150 Power supply board S25552-B651-C1

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4 Brief Description of Az S 350 U Boards

4.1 VAU Board

Processing and monitoring board

VGL = Comparator (yellow LED)

SPW = Voltage controller (red LED)

PAB = Program-controlled shutdown (red LED)

ANL = Start-up (red LED)

Red button = System reset

VGL SPW PAB ANL

Fig. 22 Front view of VAU board

The two VAU processing and monitoring boards with their 2 MHz 8085 microprocessors are the central circuit boards of the microcomputer system. They have an 8 kB RAM and a 32 kB EPROM. Due to the dual-channel layout of the evaluation computer, there is one VAU board per channel.

The VAU board is a SIMIS C CPU board, in which two independent MES80 microcomputers are connected without additional circuits to form a clock-synchronised dual-channel microcomputer system providing SIMIS core functions.

Each VAU board monitors and compares the synchronous and identical

operation of both microcomputers and, in case of a fault, transmits a switch-off control signal (SCS) in order to disconnect the connected signalling and safety peripherals. After a system reset, the standard sequence of operations starts on the VAU boards.

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4.2 STEU Board

Control and diagnostic board

The STEU control and diagnostic board buffers the signals transmitted by the counting heads. Due to the dual-channel layout of the evaluation computer, there is one STEU board per channel. The LEDs on this board display the following:

· normal display: display of the operating states of the four track vacancy detection sections (during operation; operating state display)

· statistics display (diagnostics): display of operating states for a certain counting head or track vacancy detection section (switchover / selection via AzGrH button)

· display after emergency shutdown: display of operating states in case of emergency shutdown

4.2.1 Normal Display

Lit LEDs 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

0 - System reset performed, pressing of AzGrT required 1 - Minus axle blocking effective; counting capacity exceeded; undefined counting pulse 2 - Count monitoring

3 - Faulty telegram transmission between evaluation computers or the second evaluation computer is shut down 4 - Reset restriction (RR) effective 5 - Section occupied, axle count not equal to 0 or another LED is on 6 - As for LEDs 0 to 5 of TVDS 1 7 - " 8 - " 9 - " 10 - " 11 - " 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. Display TVDS 1 Display TVDS 3 STEU 1 Channel 1 (left board) 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. Display TVDS 2 Display TVDS 4 STEU 2 Channel 2 (right board) TVDS 4 not configured Display of telegram transmission state

Meaning of LEDs for TVDS 1 Meaning of LEDs for TVDS 3 Lit LEDs 0 - As for LEDs 0 to 5 of TVDS 1 1 - " 2 - " 3 - " 4 - " 5 - " 6 - As for LEDs 0 to 5 of TVDS 1 7 - " 8 - " 9 - " 10 - " 11 - " Meaning of LEDs for TVDS 2 Meaning of LEDs for TVDS 4 TVDS 4 not configured 7 - LEDs 7 to 9: 8 - Display of telegram 9- transmission state

Fig. 23 Front view of STEU board; display of operating states for TVDS 1 to 4

The two STEU boards display the operating states for track vacancy detection sections 1 to 4 (normal display). STEU 1, channel 1 displays TVDS 1 and TVDS 3. STEU 2, channel 2 displays the states of TVDS 2 and TVDS 4.

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4.2.2 Statistics Functions / Diagnostics

STEU 1 Channel 1 (left board) STEU 2 Channel 2 (right board) 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

LEDs for statistics function selection STEU 1 Channel 1 (left board) STEU 2 Channel 2 (right board) 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. Display of selected statistics function Display of result for selected statistics function LEDs for display of results LEDs for object selection Select with AzGrH button Result

Display of selected object

(CH, TVDS, block information or system information selectable)

Fig. 24 Front view of STEU board; statistics display

For example, the following statistical and diagnostic data can be displayed:

· WDE-related data

- total number of axles since the last system start-up and number of

axles detected by the counting head

- total number of supply voltage failures since the last system start-up

· TVDS-related information

- operating state for a TVDS

- total number of occupancies since the last system start-up

· block information

- distribution of block information (contents defined by the railway operator)

· system information (e.g. software version, software variant)

Note

For more detailed information, see Az S 350 U Maintenance Instructions; A25552-C605-U1-*-7620.

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4.3 BLEA12 Board

Block input / output board with 12 relay outputs

T1

T2

T3

T4

Fig. 25 Front view of BLEA12 board (left); front connector with buttons (right)

The BLEA12 board is the input / output interface of Az S 350 U. It has 12 floating relay outputs and 12 floating optocoupler inputs. Inputs and outputs are made via a 48-pin connector on the front panel of the board.

The BLEA12 board is a single-channel board. For the dual-channel

Az S 350 U, two BLEA12 boards (first pair of BLEA12 boards) are required – for channel 1 and channel 2.

A maximum of four track clear / occupied indications (non-equivalent and equivalent) with the associated reset restriction (RR) and reset

acknowledgement (RA) are output. The remaining inputs and outputs can be used for user-defined, operator-specific information (e.g. block information). If the outputs are not required for track vacancy detection sections, a maximum of 12 user-defined, operator-specific items of information can be implemented. The four buttons (T1 to T4) on the front connector of the first pair of BLEA12 boards permits connection of the AzGrH button.

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The relay output concept provides for dual-channel output of the track clear and occupied indications, which can be configured as a normally open contact chain or a normally closed contact chain:

Non-equivalent output Equivalent output Channel 1 Channel 2 C1 C2 C3 C4 C1 C2 C3 C4 Channel 1 Channel 2

Fig. 26 Output variants for track clear / occupied indications

In the dual-channel Az S 350 U, four relays contribute to each fail-safe output (track clear / occupied indications and user-defined, operator-specific

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Indications: clear / occupied e.g. relay circuit

BLEA12 board Interlocking V = 60 V DC 0 V Az S 350 U V Channel 2 Channel 1

Fig. 27 Example of a relay circuit with double-cut

The outputs have to be linked and evaluated by the higher-level interlocking system, i.e. they have to be checked as to their equivalence or

Siemens Az S350 U

System Description

Az S 350 U

Microcomputer Axle Counting System

(Amended for use on Indian Railways)

Note

Contents

1

Introduction

1.1

Principle of Track Vacancy Detection

1.2

Principle of Axle Counting

1.3

Wheel Detection Equipment

1.4

Data Flow between Components

2

System Overview

2.1

Connection to Any Type of Interlocking

2.2

Flexible Configuration

2.3

Procedure-protected Data Transmission

2.4

Double Usage of Counting Heads

2.5

Transmission of Operator-specific Information

2.6

System Compatibility

2.7

Fail-safety

2.8

Easy Configuring

2.9

Multiple-axle Counting Method

2.10

Reset Options

2.11

Flexible Power Supply

2.12

Maintenance

2.13

Applications

2.13.1

Application Variant with One Counting Head per

Evaluation Computer

2.13.2

Application Variant with One Track Vacancy Detection

Section and more than One Counting Head

2.13.3

Application Variant with Two Track Vacancy Detection

Sections Detected by One Evaluation Computer

2.13.4

Application Variant with Two Track Vacancy Detection

Sections (Points) and Jointly Used Counting Head

3

Structure and Mode of Operation of

Az S 350 U

3.1

System Structure

3.2

Outdoor Equipment

3.2.1

ZP 43 Wheel Detection Equipment

3.2.2

DEK 43 Double Wheel Detector

3.2.3

Connecting Cables

3.2.4

Trackside Connection Box

3.2.5

External Power Supply for ZP 43 (Optional)

3.2.6

Double Usage for ZP 43 (Optional)

3.2.7

Overvoltage Protection for ZP 43

3.2.7.1

Overvoltage Protection for ZP 43 E