Re: Sounds familiar...
> I got called in to sort it out, had to use packet sniffing to find out what they were doing (as the PLC guy was too clueless to be helpful),
I've found this time and time again with PLC twats. The fact that one such installation controls a couple of 1MW generator/UPS setups and has direct control of such things as overspeed control should be enough to cause sleepless nights, given the company in question has $verylarge multiMW installs with $extremelylarge companies across the UK - including a couple of airports and supermarket chain head offices that I know of.
Biting the hand that feeds IT
