Programmable logic controller (PLC) or programmable controller is a digital computer used for automation of electromechanical processes. We still use the "ladder logic" which resembles the relay logic of earlier systems.
CLICK Programming Software is used to program the CLICK PLCs. This is a freeware. The company produces many low cost PLCs and are a good way to start learning PLCs.
It allows you to create enterprise web applications by drawing visual diagrams
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