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M580 ERIO architecture and swap behaviour - ERIO Input management

Published date: 07 March 2019

In a M580 ERIO architecture, let’s considered 3 differents use cases for Hot Standby hotswap:

1 - Send swap command via DDT control bit -> swap is OK, inputs are properly managed by default / by design
2 - Power off primary rack -> swap is OK, inputs are properly managed by default / by design
3 - Disconnect / remove both ERIO cables on the Primary CPU
Standby will take over, but Inputs bump to 0 could be visible depending on task duration.

If you are concerned by the 3rd use case, to work around this behaviour you need to consider the drop health bit: e.g. RACK1_MOD_COM.DROP_COM_HEALTH
 

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