Programmable logic controller (PLC) is a control system consisting of electronic equipment used to control certain processes (read the previous article here). PLC is part of the control system that is connected to control components such as switches, solenoids, and other sensors. PLC which is part of the control system is directly connected to the control process which is carried out according to the program in the memory. PLC will receive input signal data, process it and produce output as output data.
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