PM866 controller memory suddenly become blank and only cold restart option was enabled
please find the controller log file. the controller memory become blank in a running plant and needs cold restart. OPC data access was healthy but alarm event was error. when going for controller download, only cold restart option was enabled. after download it become healthy.
can anybody tell me the exact reason behind this ?
The log is full of errors indicating power failure issues. For example ...
> PwrFail 00C599D8 01 00000000 000004D0 PEND
> This PM has been automatically restarted.
> - POWER_FAIL, Power fail signal from power supply
> PowerFails: 2
> No memory dump due to missing compact flash card
> Initiating log upload...
> Log uploaded