It’s worth a mention that new PLC’s are entirely capable, can be fault tolerant and completely redundant, with hot swap modules and redundant fiber optic network and I/O connections. Some have web servers built in and can speak many, many protocols for communication. They’re programmed in standard text based languages if need be. It’s not fair to give a bad impression of something by using old technology and only giving a one sentence mention to the newer models(which aren’t actually too new) that do things well beyond the capabilities of those ancient dinosaurs. I work on Siemens S7-400H systems all day so I may be a bit defensive. But it deserves more a mention then what new PLC’s got.
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