1492-IFM40D241492-IFM40D24

接地和接线    1） PLC的良好接地是正常运行的前提。在设计时，PLC的接地应与动力设备的接地分开，采用接地；如不能分开接地时，应采用共用接地；禁止采用共通接地方法。如图1所示，接地点应尽可能靠近PLC，接地线的线径应大于4mm²，接地电阻一般应小于10Ω。
            

图1 接地方法
    2） PLC的接线包括输入接线和输出接线。输入接线的长度不宜过长，一般不大于30m；在线路距离较长时，可采用中间继电器进行信号的转换。输入接线的COM端与输出接线的COM端不能接在一起。输入接线与输出接线的电缆应分开设置。必要时，可在现场分别设置接线箱。集成电路或晶体管设备的输入信号和输出信号的接线必须采用屏蔽电缆；屏蔽层的接地端应为一点接地，接地点宜在控制器侧。

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