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PLC的电源、I/O电源一般采用不带屏蔽层的隔离变压器供电，在较强干扰源环境中使用时接地截面积不小于2，接地电阻不大于100kΩ，接地线采用独立接地方式；可编程控制器电源线、I/O电源线、输入信号线、输出信号线、交流线和直流线尽量分开布线，开关量信号、模拟量信号要分开布线，模拟量和数字传输线采用屏蔽线并屏蔽接地。大多数PID控制都是基于单片机进行，但单片机控制的DDC系统软硬件设计较为复杂，特别是涉及到逻辑控制方面更不是其长处，而PLC在这方面却是公认的最佳选择。随着PLC功能的扩充，许多PLC控制器中都集成了PID控制功能，因此在逻辑控制与PID控制混合的应用场所中采用PLC控制是较为合理的。近年来，随着我国自动化技术的提高，工厂自动化也上了一个新台阶。可编程逻辑控制器（PLC）作为一个从八十年代发展起来的新兴的工业控制器，是自动控制、计算机和通讯技术相结合的产物，是一种专门用于工业生产过程控制的现场设备。PLC以其体积小、功能齐全，价格低廉，可靠性高等方面具有独特的优点，在各个领域获得了广泛应用。
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