The expander processor module, shown in Figure 5-3, resides in the two leftmost processor slots of the expander chassis and provides the interface between the expander and controller chassis. The module is fault tolerant with HIFT TMR architecture.
Comprehensive diagnostics, monitoring and testing provide rapid fault
identification. A standby module configuration is supported, allowing automatic and manual repair strategies.
The expander processor modules are connected to the expander interface
modules by the expander interface hot link cable TC-301 (described in greater detail in section 7) via the expander interface
adaptor unit T8312. The data transfer rate is 250Mbps.
The expander processor module derives its internal voltages from dual redundant +24V dc power supplied via the module
connector from the expander chassis backplane.
Figure 5-3:
Expander Processor
The expander processor module status LED states and their meanings are:
Table 5-1: Expander Processor Module LED Indications LED Indication
Healthy
Three LEDs, one for each of the three slices, indicating the overall health of each slice.
Steady green - a healthy slice.
Flashing red - a fault in the corresponding slice.
Active Green when the module is in the Active mode.
Standby Steady green when the module is in the Standby mode.
TxRx
Three LEDs, one for each of the three channels, indicating the communications activity on each processor channel.
When the module is active:
Green - Receive activity Red - Transmit activity Off - no activity or failed
When the module is in standby, no Transmit activity (red LED) will be observed.
the LED will appear amber when both receive and transmit activities are occurring.
Test Your Knowledge
1. What slot number is the leftmost Expander Processor?
2. How (from where) do modules get internal power?
3. What slot number is the rightmost slot in the Expander Chassis?
4. What would be the chassis number of the first Expander Chassis in a system?
5. What does an amber Tx/Rx LED mean on an Expander Processor?
I/O Modules
Purpose
To describe the input and output modules in greater detail.
Objectives
• To understand the various I/O modules that are available.
• To understand the difference between companion slot and smart slot arrangements.
Chapter 6
I/O Modules
All I/O modules share common functionality and form. All modules have a label on the side detailing their build issue and serial number. The serial number should be provided with all inquiries so the module’s history can be traced.
Type I/O Voltage Current Channels Comments
T8402 Digital Input 24Vdc - 60 No channel LEDs
T8403 Digital Input 24Vdc - 40
T8423 Digital Input 35-120Vdc - 40
T8424 Digital Input 120Vac - 40 Uses resistive divider on special FTA
T8431 Analog Input 0-6V - 40 AIs use external 250Ω resistor T8432 Analog Input 0-6V - 60 No channel LEDs
T8433 Analog Input 0-6V - 20 Isolated channels. Uses special FTA
T8451 Digital Output 24Vdc 50mA-2A 40 2A maximum but must be 1A average
T8461 Digital Output 24 to 48Vdc 25mA-0.75A 40 T8471 Digital Output 120Vdc 20mA-0.5A 32 T8472 Digital Output 120Vac 10mA-0.5A 16
T8480 Analog Output - 4-20mA 40
Table 6-1: Common I/O Modules
Specialized modules include:
• T8442 Speed Monitor: for speed and over-acceleration trip of rotating equipment
• T8448 Zone Interface: for fire & gas applications
• T8449 Valve Monitor: for partial stroke testing of valves Most modules allocate three separate field circuits to each point allowing measurement voting and fault tolerant output control.
60 channel modules are ‘dual’ and are used for lower integrity
I/O Module Status LEDs
There are six module status LEDs on the module front panel;
three Healthy, one Active, one Standby, and one Educated. The module status LED states and their meanings are:
LED State Description
Healthy Off
No power applied to the module.
Slice is in the start-up state (momentary after installation or power-up).
Slice is healthy.
Fault present on the associated slice but the slice is still operational.
On installation – power applied to the associated slice.
The associated slice is in the fatal state. A critical fault has been detected and the slice disabled.
Active Off Green
Red – flashing Red – flashing
Module is not in the Active state.
Module is in the Active (or Maintain) state.
Module is in the shutdown state if the Standby LED is off.
Module is in the fatal state if the Standby LED is also flashing.
Standby Off Green Red – flashing
Module is not in the Standby state.
Module is in the Standby state.
Module is in the fatal state. The Active LED will also be flashing red.
Educated Off Green
Green – flashing
Module is not educated.
Module is educated.
Module is recognized by the Processor but education is not complete.
Table 6-2: Common I/O Module LED Indications
24 Vdc Digital Input Module - 40 Channel (T8403)
Each field input of the 40 channel 24Vdc digital input module, shown in Figure 6-1, is triplicated. The input voltage is measured and compared to user configurable
threshold voltages to determine the reported field input state.
The module can detect open and short-circuit field cables when a line-monitoring device is installed at the field switch. Line monitoring functions are independently configured for each input channel.
The module provides on-board sequence of events (SOE) reporting with a resolution of 1ms. A change of state triggers an SOE entry. States are determined by voltage thresholds that can be configured on a per channel basis.
Figure 6-1:
24Vdc Digital Input Module
Status LEDs
There are input channel status LEDs on the module front panel, one for each field input. The input status LED mode is
dependent upon the voltage level of the field I/O signal. Each field input voltage is measured and compared to six threshold levels (four configurable and two fixed) which produce seven threshold bands, as described in Section 10. Each threshold band can be defined to have a particular indicator mode: off, green, red, flashing green, or flashing red.
The configurable voltage thresholds and LED modes allow users to customize the input measurement and status indications to suit individual application requirements. Without
customization, the default indicator modes are suitable for digital inputs without line monitoring and are:
Table 6-3: Default Digital Input Module LED Indications Indicator State Description
Off Green Green – flashing Red – flashing
Open field switch (contact) Closed field switch (contact)
Associated channel input voltage out of range (i.e., either below the lowest trip threshold or above the highest)
Associated channel faulty
Analog Input Module - 40 Channel (T8431) The TMR 24V dc analog input module, shown in Figure 6-2, interfaces to 40 sourcing field input devices. The module is designed to monitor input signals in the range 0-6V (0 to 24mA via a 250R resistor on the field termination assembly). The module acts as a current sink for the devices.
The module can detect open and shorted field cables using the built-in line-monitoring feature. Line line-monitoring functions are independently configured for each input channel.
The module provides on-board sequence of events (SOE) reporting with a resolution of 1ms. A change of state triggers an SOE entry (not an application logic action). States are determined by voltage thresholds that can be configured on a per channel basis.
Figure 6-2:
Analog Input Module
Status LEDs
The input status LED mode is dependent upon the voltage level of the field I/O signal. Each field input voltage is measured and compared to six threshold levels (four configurable and two fixed) which produce seven threshold bands, as described in Section 10. Each threshold band can be defined to have a particular indicator mode: off, solid or flashing green, or solid or flashing red. One example of LED indications for analog inputs would be:
Table 6-4: Example of Analog Input Module LED Indications
Indicator State Description Off
24 Vdc Digital Output Module - 40 Channel (T8451)
The TMR 24V dc digital output module, shown in Figure 6-3, interfaces to 40 field devices. The module tests for stuck on and stuck off failures.
The module provides automatic line-monitoring of field devices. This feature enables the module to detect both open and short circuit failures in field wiring and load devices.
Output modules read back current and voltage, which can be used in application programs or for troubleshooting.
The module utilizes automatic over-current protection (per channel). No fuses are required.
The module provides on-board sequence of events (SOE) reporting with a resolution of 1ms. An output change of state triggers an SOE entry. Output states are automatically determined by voltage and current
measurements on board the module.
Variable names connected to output points (not states) will be time tagged at the main processor, not at the output module.
Figure 6-3:
24Vdc Digital Output Module
Status LEDs
The default indicator modes for digital outputs are:
Table 6-5: Default Digital Output Module LED Indications Indicator State Description
Off Green
Green – flashing Red
Red – flashing
Output is Off Output is On
No Load, output open circuit
Field short circuit, output over current protection triggered and output channel is latched off Channel fault, or no field supply voltage