Hi All,
We face to an enigmatical event of PLC.
This PLC had operation in good condition for 10 days before this enigmatical event happen. Suddenly, the PLC switch off all the I/O, reload the program and turn on the I/O. After 2 minutes, PLC repeat this few step again. Its frequently happen in two minutes time without rhyme or reason.
After that, we transfer a BLANK program into PLC, that few step switch off and on the I/O was not happen again. After monitoring in one hour, we transfer back the original program into PLC, and it also doesn't have any abnormity happen untill now.
Before this abnormity happen untill it operation back to good condition, all wiring for I/O, analog I/O, power supply and RS485 unchanged and no unpluged.
Does anybody have an experience with this event before?
Our customer request: "Please investigate the actual route cause to eliminate the problem to the future. Please narrow down to the detail."
Thank You,
Regards,
FQ