Failure module when turn off/on Compact HMI System
We have a implementation with compact hmi 800 system integrated by follow devices:
I/O modules: AI801, AO801, DI801, DO801
When we turn on/off the system, all I/O modules become failure and we can't go online to PLC, we have to download the program to PLC again for clear the failure.
We don't understand the cause of this failure. We appreciated so much any help that you bring to us.
What do you turn off? Everything (i.e. a complete blackout), or?
Without battery backup, the application will go lost and IO assume predesigned values (OSP).
Note: the built-in lithium battery and the older external battery SB821 are both subject to "lithium passivation" (covered by ABB Technical Description # 3BSE043762) and may cause loss of application if the battery is not able to supply enough voltage and current when power is switched off. The new external battery SB822 does not have the same problem.