Backup NIS module did not take over when primary module failed
We have Symphony Harmony installed at plant with 5 . We faced an issue a few days back whereby we received a 8 power fault and Loop error alarms. On the , all the values turned purple. On visiting the panel, we found both primary and secondary modules in stopped state. We started the module 3 , however, module 5 did not start, therefore, we replaced it.
specification: Network Interface Module, Type: INNIS21 (Make: )(Network Interface Module,
After replacement of module, all the errors and faults normalized. In the past, on the same PCU8, we have had instances when secondary did not take over from primary module.-Net to Node Communication Interface SPNIS21
Therefore, your support is needed regarding following questions:
- Why does PCU8 backup module not take over from primary? Any checks recommended?
- Any steps to rectify this issue?
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