Digital Input and Output Modules (I/O):

The following section describes the various I/O modules used in the SIMIS S system. The system allows modular configuration of all standard boards available.

(a) Digital Input Module (Vital). (b) Digital output Module (Vital). (c) Digital Input Module 326 (Vital). (d) Digital output Module 322 (Non-Vital). (e) Digital Input / Output Module 323

(f) Digital Input Module – Standard (Non-Vital) (g) Digital Output Module – Standard (Non-Vital) (h) Optical Link Module (OLM).

(i) Repeater Module. (j) Interface Module IM 151

(k) Electronic Terminal (ET) Station Module.

(a) Digital Input Module (Vital) :

Fig No : 6 Digital Input Module (Vital)

The digital input board (Vital) converts the external binary signals from the process into the internal signal levels of the SIMIS S. The green LEDs indicate the signal states. Signal cables can be connected with front connectors and can be labelled in a lettering field next to the LEDs.

As per SIL4 safety requirement every input reading has to be done by sensing two contacts, generally one front and one back of the same relay input that has to be sensed. Hence 8 digital input contacts can sense 4 numbers of inputs in a failsafe manner.

The general practice is to sense the front contact through Vs1and back contact through Vs2.

The address switch is a ten-position dipswitch that has to be set in the required position, so that the processor is able to identify the correct Input card.

The processor logic contained in the Input card multiplexes the input information and sends it to the main processor through "Back Plane Bus".

The module also has "SF" (System Fault) to indicate group fault. A high input is indicated through a green LED Display on the module.

Galvanic separation is provided through optical isolation of signals between "Processor logic" and "Back Plane Bus Interface".

The technical specs are as below:

(i) Suitable for 8 digital inputs equivalent to 4 nos. of SIL4 inputs. (ii) Rated input voltage 24 V DC.

(iii) Two sensors for each of the four inputs 1 Vsf & 2 Vsf (Vsf : Voltage supply fault).

(iv) Group fault display SF (System Fault).

(v) Status display for each input. Input delay 3 Milli seconds. (vi) Internal optic isolation in data link.

(vii) Hot swapping of module.

(viii) Low power consumption of 4 W.

(ix) Length of unshielded cable connection 200 m. (x) Normal voltage 24 VDC. Range 20.4 V to 28.8 V.

(xi) Sensing range: “1” = 15V to 30 V & “0” = –30V to + 5V. (xii) HW Coding.

(xiii) SW (dipswitch) coding.

(b) Digital output Module (Vital) :

Four relays can be driven by one module. The outputs are grouped as 2 outputs on the left side and two on the right side.

The address switch is a ten-position dipswitch that has to be set in the required position, so that the processor is able to identify the correct Output card.

Galvanic separation is provided through optical isolation of signals between "Processor logic" and "Back Plane Bus Interface".

DIGITAL INPUT/OUTPUT MODULE

The digital output Module converts the internal signal levels of the programmable logic controller into the external binary signal levels needed for the process.

Fig No : 7 Fig No : 8

Digital Output Module (vital) Digital Input Module 326 (Vital ),

Digital output modules are characterized by the following features: (i) Suitable for driving 4 failsafe out puts.

(ii) Rated drive voltage 24 VDC. Range 20.4 V to 28.8 V (iii) Load resistance range 12 Ohms to 1K Ohms. (iv) Power dissipation 3.5 W typical.

(v) Suitable for driving relays or indications. (vi) Status display for each driven output. (vii) Optic isolation with Profibus.

(viii) Hot swapping feature. (ix) Output indication. (x) HW coding.

(c) Digital Input Module 326 (Vital) :

Digital Input Module 326 (Vital ), SM326:DI 24 X DC24V has the following features:

(i) 24 inputs, isolated groups of 12. (ii) 24V DC rated input voltage. (iii) Suitable for switches.

(iv) 4 short circuit-proof sensor (isolated in groups of 2) supplies for 6 channels. (v) Group error display (SF)

(vi) Safety mode display (SAFE)

(vii) Status indicator for each channel. (Green LED)

(viii) Reconfiguration in Run (CIR) – possible in standard mode. (ix) Assignable diagnostics.

(x) Diagnostic alarm with assignable parameters. (xi) Usable in standard and safety modes.

(xii) Configure 1-out of –1 and 1-out of –2 for each channel (xiii) Simplified PROFI safe address assignment.

(d) Digital output Module 322(Non-Vital) :

Fig No : 9 Fig No : 10

Digital output Module 322(Non-Vital) Digital Input / Output Module 323

Digital Output module 322(Non-Vital) i.e SM 322: DO 8 x 24 VDC /2A has the following salient features:

(i) 8 Outputs, isolated in groups of 4. (ii) 2A output current.

DIGITAL INPUT/OUTPUT MODULE

(e) Digital Input / Output Module 323 :

The following mechanical features characterize digital input/output modules:

(i) Compact configuration.

(ii) Green LEDs to indicate signal states at the inputs and outputs. (iii) Front connector protected by the front cover.

(iv) Labeling area on the front cover.

(v) Easy installation. There are no slot rules. The output addresses are defined by the slots. When they are used in the ET 200M in combination with active bus modules, hot-swapping is possible.

(vi) User friendly wiring. Digital input/output modules convert:

- The levels of the external digital signals from the process into the internal signal level of the PLC.

- The internal signal level of the PLC into the external signal levels required for the process.

- 8 nos. of Digital Inputs and 8 nos. of Digital Outputs at 24 VDC / 0.5A.

(f) Digital Input Module – Standard (Non-Vital) :

Fig No : 11 Fig No : 12 Digital Input Module Digital Output Module Standard (Non-Vital) Standard (Non-Vital)

The digital input board (Non-Vital) converts the external binary signals from the process into the internal signal levels of the SIMATIC S controller. The green LEDs indicate the signal

states. Signal cables can be connected with front connectors and can be labelled in a lettering field next to the LEDs.

(i) Shows green indication of “high” input channel Module failure manifests when operation of button on panel is not effective.

(iii) Check if the Interlocking is accepting the command by observing the “button operation indication” on the panel

The technical specs are as below:

- Suitable for sensing 4 standard inputs (push buttons). - Optic isolation of inputs.

- Rated drive voltage 24 VDC.

- Unshielded cable length at input - 1000 m - Power dissipation 0.7 W typical.

- Input signal “1” = 15V to 30V and “0” = –30V to 5V - Input current for ‘1’ signal 7mA @ 24VDC

- Status display of high input.

(g) Digital Output Module – Standard (Non-Vital) :

The digital output Module converts the internal signal levels of the programmable logic controller into the external binary signal levels needed for the process.

The following features characterize digital output modules: (i) Suitable for driving four standard out puts (LEDs) (ii) Optic isolation of outputs

(iii) Status display of high output (iv) Power dissipation 0.8 W typical

(v) Unshielded cable length at output - 600 m (vi) Rated drive voltage 24 VDC

(vii) Shows green indication of “high” output channel