PeekabuPi:
Yeah thats interesting too. I always wondered what chips industrial PLCs use. Do they use commercial ones manufactured by large fab houses or do they program their own controllers with FPGAs, ASICs, etc?
They use also FPGAs and ASICs on PLC boards but this does not mean they are implementing their own processors in ASICs. That would be highly inefficient as long as there are proven processors on the market with good compilers and IDE.