Multiple Groov EPIC Response to Power Loss Event

groov EPIC
1

Hello Forum,

My setup involves one EPIC running the PAC Control Strategy, this EPIC is battery backed up. The EPIC running the strategy controls the I/O of the other EPICs in the plant. In the event of a power loss at site the other EPICs will loose power. On power restart, the EPICs that lost power will reboot, during the reboot sequence they energize points that were sent “On” or “HI” from the control strategy before power loss. The problem is that some of these points control contactors, VFDs, etc. This is an issue as the process should be completely idle until all PLCs have powered up. What I’d like to be able to do is have the points remain off until the the I/O enabler is responding with all good comms across all EPICs. I can’t find anything in the documentation about this, but I could be pointed to the wrong spot. Has anyone else had this issue? Please let me know how you resolved it.

Thanks, Dan

2

We’ve set ours up to have an auxiliary feedback to show power states as a digital input to the main EPIC running the strategy, then when power goes OFF, in the strategy we latch those important points to stay OFF until human intervention changes a bit from the HMI for a “reset”.

I’m sure you could do something similar using the function command “IsIoUnitReady”. Then if you want those points to automatically turn true once power is restored to all units, just use an “and” statement for all IsIoUnitReady are True.