Yes, it is possible. Safety-rated PLC-based control systems are currently in use. Category 3 is common, Cat. 4 is possible. The PLC uses redundant processors manufactured by different vendors and all communication signals are checked and back-checked prior to processing. What are you trying to accomplish?
__________________
Aequam memento rebus in arduis servare mentem.
Electronic control systems for mass transit railways are backed up by supervisory interlocking in the UK. In that sense there is a level of redundancy.
__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Redundacy in DCS and PLC
Re: redundancy in DCS & PLC
