AC500/PM573 freezing at 'boot' startup sequence
I have a few PLCs out in the field (about 4-5) that are freezing in their start-up sequence at the 'boot' stage after a power cycle.
There are no error lights, only the power light and 'boot' on the screen. Problem only clears once there have been a few further power cycles.
The programs are the same in each, however there are more identical units around the world which do not have this problem. Additionally, the PLC serial numbers are not sequential, so it doesn't look like a hardware problem.....
The on-site tech's dont have access to the PLC fault logs so there's no chance of clearing it up that way, and not sure I'll see anything in there anyway.
Anyone had something similar?