[Cause]
Not all data for variable timers, counters, keep relays, and data tables could be saved at the last power-off. Some of this data may be old. Executing the PMC program in this state would be dangerous, so the PMC program was not started automatically at this power-on.
[Countermeasure]
It could be the failure of the main printed circuit board, the PSU printed circuit board. Replacement of these printed circuit boards. In addition, please load the PARAM.PMC that saved the correct value.