What could be the recommended setting of Hold Up Time for M580 Distributed Equipment.

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The hold up time represents the time that device outputs are maintained in their current states after a communication disruption and before taking their fallback values. Because distributed devices are not connected to the primary CPU during a switch-over, set the hold up time to a value greater than the expected duration of the communication interruption.

For Modbus TCP devices:
Set the hold up time to exceed: 4.4 x (MAST period) + 600 ms.

For EtherNet/IP devices:
Set the hold up time to exceed: 4.4 x (MAST period) + 5000 ms.