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A PLC looks like it reacts instantly. You press a button, a light turns on. A…

A safety relay that refuses to reset can make a machine feel completely locked up. The…

A 4–20mA signal is one of those things that looks strange when you first meet it.…

A 0–10V signal looks simple. Zero volts means minimum. Ten volts means maximum. Somewhere in the…

A PLC and HMI connection should be boring. That is the dream, anyway. The operator presses…