Main Ring Diagnostics

Diagnosing the RIO Main Ring

You can monitor breaks in the 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.

main ring

The main ring of an Ethernet RIO network. The ring contains RIO modules and a local rack (containing a CPU with Ethernet I/O scanner service) and a power supply module.