Description
All TMR digital input modules maintain a complete, continuous diagnostic channel for each system. Any diagnosis failure activates the Fault indicator of any channel module, which in turn activates the chassis alarm signal. The module fault indicator indicates a channel fault, not a module failure. Ensure that the module runs properly in the presence of a person with a single error, and may continue to operate correctly for some kinds of multiple faults. Models 3502E, 3503E, and 3505E can be self-checked to detect a stuck condition where the circuit cannot determine a point into the Off state. Since most safety systems have a tripping capability the ability to detect departure points is an important feature. To test the card input, the switch in the input circuit is turned Off to allow the input (Off) to be read through the optical isolation circuit. The last read data is frozen in I/O
At the same time, the communication processor is being tested. All TMR digital input modules support hot spare capability requiring a separate external Terminal panel (ETP) with cable interface to the Tricon backplane. Each module is mechanically bonded to prevent incorrect mounting on a configured chassis.
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