Programmable logic controller(Programmable Logic Controller,PLC),which uses a type of programmable memory for its internal storage of programs,executes user-oriented instructions such as logical operations,sequence control,timing,counting and arithmetic operations,and uses digital or Analog inputs/outputs control various types of machinery or production processes.
Programmable logic controllers(PLCs)have been an integral part of factory automation and industrial process control for decades.Applications ranging from simple lighting functions to environmental systems to chemical processing are all inseparable from PLC control.
可编程逻辑控制器（ProgrammableLogicController，PLC），它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算、顺序控制、定时、计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。
数十年以来，可编程逻辑控制器（PLC）始终是工厂自动化和工业过程控制有机组成的一部分。从简单的照明功能到环境系统、再到化学加工等各种应用，都离不开PLC控制。
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