Honeywell 621-9937C Parallel I/O Module Processor Rack Power Supply

Honeywell 621-9937C Parallel I/O Module Processor Rack Power Supply

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While the processor is in the DISABLE mode, the RUN LED is turned ON. The scan loss timer is cleared at the beginning of every PLC scan unless a timeout occurs. If a timeout occurs, the RUN LED is

turned OFF.

All local I/0 are cleared or frozen according to the DIP switch settings on the processor board. The hardware of the processor module sends a power fail signal to the I/0 system. Outputs are cleared or held in the last state in the DISABLE mode, depending on the PIOM setting for each I/0 rack and the processor module DIP switch selections.

FORCE functions are permissible if they are ENABLED by the processor DIP switches. Timer and counter modifications may be made.

To change the processor from the DISABLE mode to any other mode of operation, one of the following conditions must be met: 1) the keyswitch is changed, 2) the Loader /Terminal generates a request for Software Program Mode, 3) a CIM generates a Software Program Mode request, or 4) the processor fails diagnostics and defaults to the Diagnostics Fail Mode.