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CRA93200 Remote IO Head shows "Error A"

Published date: 24 September 2019

Issue:
CRA93200 Remote IO Head Module shows "Error A" (communication error on channel A). In the past, cycling power by removing and re-installing fuses has cleared the error, but that isn't working now.

Product Line:
Quanum PLC Hot Standby
CRA93200 Remote IO Head Module

Cause:
Transferred the system to manual, then checked all of the coax on channel A (which is what the error referred to in the manual). A misaligned coax cable conductor was found at one of the splitters. 

Resolution:
If you twist and turn the coax connector, an audible click is heard indicating that the conductor was misaligned and was placed back in alignment. At the same time, both errors on the PLCs reset. Had to hard cycle the PLCs to get the HMI error to clear and get a healthy system indication.

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