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Programmable Logic Controller is a programmable logic controller, enables flexible implementation of logic control algorithms through a programming language. The user can program to execute a sequence of events. These events are triggered by the stimulus (input) acting on the PLC or by delayed operations such as time or event counting. PLCs are used to replace relay circuits in practice. The PLC operates by scanning the state of the output and input. When there is a change in input, the output will change accordingly. Programming languages ​​of the PLC can be Ladder or State Logic. There are many PLC manufacturers such as Siemens, Allen-Bradley, Mitsubishi Electric, General Electric, Omron, Honeywell.