I like PLC's as well. I don't know much about them, but our company has installed, and worked on a few. We installed an AB PLC 5. for a conveyor system. Relay logic is slowly becoming a thing of the past. I have a friend who works for a traffic signal company, and he says that all new traffic signals that they install have a PLC in them with a modum so troubleshooting and signal ajustments can be made from a remote location.
Programmable Logically Yours,
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