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This paper provides both Theory and Programmable logic controller (PLC) in Automation engineering. According to various manufacturing company, the nature and useful area of PLC may be different and this paper mainly supports step by step approaching methods to be familiar with what is PLC and how PLC work. Automation purpose is the main application of PLC and the programmers or control supervisors will be able to learn easily with the four levels or steps that perform in this paper.doi:10.31142/ijtsrd15743 fatcat:bhbdnhosuraofpv2hbzkyuftom