PLC作用：
PLC是多数工业控制和工厂自动化系统的核心组成部分，通常被称为工厂的“大脑"，PLC 通过接收和处理来自传感器和机器的数据来实现广泛的功能，然后使用这些数据来控制和制动外部设备。除此之外，成功的设计必须具备可靠性、系统稳定性以及与连接的自动化系统的互操作性。
现在工业上使用可编程逻辑控制器已经相当接近于一台轻巧型计算机，甚至已经出现集成个人计算机(采用嵌入式操作系统)与PLC结合架构的可编程自动化控制器(Programmable Automation Controller，简称PAC)，能透过数字或模拟输入/输出控制机器设备、制造处理流程及其他控制的电子系统。
1、用于开关量控制
目前，PLC的首要目标，也是别的控制器无法与其比拟的，就是它能方便并可靠地用于开关量的控制。用PLC进行开关量控制实例是很多的，冶金、机械、轻工、、纺织等等，几乎所有工业行业都需要用到它。
2、用于模拟量控制
模拟量，如电流、电压、温度、压力等等，它的大小是连续变化的。工业生产，特别是连续型生产过程，常要对这些物理量进行控制。用PLC实现模拟量控制是*可能的。
PLC进行模拟量控制，要配置有模拟量与数字量相互转换的A/D、D/A单元。它也是I/O单元，不过是特殊的I/O单元。
3、用于运动控制
实际的物理量，除了开关量、模拟量，还有运动控制。PLC可接收计数脉冲，加上PLC有数据处理及运算能力，若再配备相应的传感器(如旋转编码器)或脉冲伺服装置，则*可以依NC的原理实现种种控制。
4、用于数据采集
随着PLC技术的发展，其数据存储区越来越大。PLC还可配置上小型打印机，定期把DM区的数据打出来。PLC也可与计算机通讯，由计算机把DM区的数据读出，并由计算机再对这些数据作处理。这时，PLC即成为计算机的数据终端。
5、用于信号监控
PLC自检信号很多，内部器件也很多，多数使用者未充分发挥其作用。其实，*可利用它进行PLC自身工作的监控，或对控制对象进行监控。
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