run, rem or prog

Original thread is over 12 years old, I'm sure everyone has learn't a lot since then.

Sreyes said:

I was told that if you power down a machine, turned the plc's key to prog and wait for the machine to fully restart, some glitches could be fixed. Thoughts??

Click to expand...

I'll be one of the voices that say that: "A well developed and well maintained PLC program should not 'fix itself' on a power cycle. PLCs are not PCs, and the 'operating system' is specifically made to manage and it expects to be powered down from time to time."

I would add that IF powering down and repowering a PLC actually 'fixes' the problem, it should be investigated...because...what's to say that the same event might actually CREATE a problem. Both are the same mechanism.

RANT=OFF