ABB SA811F
General
All I/O modules can be exchanged online and with the process power supply connected, except for relay outputs with normally closed contacts. This is possible because the module deactivates when the I/O module lock switch is turned to unlock. The system software in the ModuleBus master checks automatically that all I/O modules function correctly. In the event of module fault, and module exchange, the module and associated signals are marked as faulty. The system software checks that the module that is inserted is correct. If this is the case, the Fault LED is turned off, and after the initial configuration, and the R(un) LED is activated, and the module resumes its normal function.
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ABB SA811F Images
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