Diagnosing the RIO Main Ring

You can monitor breaks in the main ring by diagnosing the REDUNDANCY_STATUS bits in the CPU with Ethernet I/O scanner service on the local rack DDT. The system detects and reports in this bit a main ring cable break that persists for at least 5 seconds.

Within the REDUNDANCY_STATUS bit:

  • 0 = A cable is broken or a device has stopped.

  • 1 = loop is present and healthy.

NOTE: Refer to the M580 RIO guide for a list of diagnostic status bits.