PLC控制系统是在传统的顺序控制器的基础上引入了微电子技术、计算机技术、自动控制技术和通讯技术而形成的一代新型工业控制装置，目的是用来取代继电器、执行逻辑、记时、计数等顺序控制功能，建立柔性的远程控制系统。具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。
PLC内部工作方式一般是采用循环扫描工作方式，在一些大、中型的PLC中增加了中断工作方式。当用户将用户程序调试完成后，通过编程器将其程序写入PLC存储器中，同时将现场的输入信号和被控制的执行元件相应的连接在输入模块的输入端和输出模块的输出端，接着将PLC工作方式选择为运行工作方式，后面的工作就由PLC根据用户程序去完成
PLC control system is a new generation of industrial control device based on the traditional sequential controller, which introduces microelectronics technology, computer technology, automatic control technology and communication technology. Its purpose is to replace the sequential control functions such as relay, executive logic, time recording and counting, and establish a flexible remote control system. It has the characteristics of strong universality, convenient use, wide adaptability, high reliability, strong anti-interference ability, simple programming and so on.The internal working mode of PLC generally adopts the circular scanning working mode, and the interrupt working mode is added in some large and medium-sized PLCs. After debugging the user program, the user writes the program into the PLC memory through the programmer. At the same time, the on-site input signal and the controlled actuator are correspondingly connected to the input end of the input module and the output end of the output module. Then, the PLC working mode is selected as the operation working mode, and the subsequent work is completed by the PLC according to the user program
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