ICS TRIPLEX T8480C 24Vdc

ICS T8480C is a powerful module with triple redundancy design to ensure that the system can operate normally even if a single channel fails, maximizing the system usage; fast response speed, able to capture transient events in time; can adapt to various harsh industrial environments, wide operating temperature range, ensuring stable operation under different working conditions.

Updated for T8480 Series C TUV certification

 

Changed Trusted 24 Vdc Analogue Output Module to Trusted 4-20mA Analog Output Module
Changed Output Field Termination Unit (OFTU) to Field Termination Unit (FTU)
Changed Analogue Output Field Interface Unit (AOFIU) to Field Interface Unit (FIU)
Description: Updated Figure 2 Functional Block Diagram
Line Monitoring and Output States: Updated table and added recommendation to use a dummy load resistor
Output Driver Structure: Updated Figure 3 Output Driver Structure
Group Fail Safe Switches: Changed OFIU to FIU
Rack 7: HKEEPING: Updated table
Field Wiring Faults: Removed short-circuit
Specifications: Updated Calibration Accuracy and Overall Accuracy

There are 40 output channel status indicators on the Module Front Panel, one for each field output. These indicators are controlled by the FPU. The FPU receives data from each of the Module slices. The FPU performs a 2oo3 vote on each data bit from the slices and sets the indicators accordingly.

The output status indicator mode is dependent upon the numerical state of the output channel. Each output state can be defined to have a particular indicator mode: off, green, red, flashing green, or flashing red.

The configurable indicator modes allow users to customize the output status indications to suit individual application requirements. Without customization, the default indicator modes are suitable for line-monitored analog output devices as described in this table:

1. Fault Reporting

Output Module faults are reported to the user through visual indicators on the Front Panel of the Module and through status variables, which may be automatically monitored in the application programs and external system communications interfaces. The user must remedy these two types of faults in general: external wiring and Module faults. External wiring faults require corrective action in the field to repair the fault condition. Module faults require replacement of the Output Module.

2. Field Wiring Faults

By measuring the output channel voltage and current, the Module automatically detects field wiring and load faults. When a field signal fails an open circuit,t or there is no field supply voltage connected, the output status indicator will display the configured LED mode, the corresponding output state will be reported, ed and the line fault status for that channel will be set to '1'. All other output channels will be unaffected, except in the case of common cause wiring and supply voltage faults in the field.

The field output voltage and current variables can be monitored to determine the actual operating conditions of each output channel. This additional information assists the user in determining the specific type of wiring fault.

Once the specific field wiring fault has been identified and corrected, the output status variables and output status indicator will display the normal on/off status of the field device.

3.Module Faults

Extensive diagnostics provide the automatic detection of Module faults. The TMR architecture of the Output Module and the diagnostics performed verify the validity of all critical circuits. Using the TMR architecture provides a fault-tolerant method to withstand the first fault occurrence on the Module and continue normal output controls without interruption in the system or process. Faults are reported to the user through the Healthy status indicators on the Front Panel of the Module and through the INFO and HKEEPING variables. Under normal operations, all three Healthy Indicators are green. When a fault occurs, one of the Healthy Indicators will flash red. It is recommended that this condition be investigated, and if the cause is within the Module, it should be replaced.

Module replacement activities depend on the type of spare Module configuration chosen when the system was configured and installed. The Module may be configured with a Dedicated Standby Slot or with a SmartSlot for a spare replacement Module.

Procurement suggestion:
If the original model of the system is T8480 Suggestion:
Give priority to purchasing T8480C (the upgraded model) It can usually be directly substituted for T8480.