Good grounding is an important condition to ensure that the PLC can work safely,and it can avoid accidental voltage shock hazards.The ground wire is connected to the ground terminal of the machine,and the basic unit is grounded.If an expansion unit is to be used,its ground point should be connected to the ground point of the base unit.In order to suppress the interference added to the power supply and the input and output ends,a dedicated ground wire should be connected to the programmable controller,and the grounding point should be separated from the grounding point of the power equipment(such as the motor).If this requirement is not met,it must also be grounded in common with other equipment,and it is forbidden to be grounded in series with other equipment.The grounding point should be as close as possible to the PLC.
良好的接地是保证PLC可*工作的重要条件,可以避免偶然发生的电压冲击危害。接地线与机器的接地端相接,基本单元接地。如果要用扩展单元,其接地点应与基本单元的接地点接在一起。为了抑制加在电源及输入端、输出端的干扰,应给可编程控制器接上专用地线,接地点应与动力设备(如电机)的接地点分开。若达不到这种要求,也必须做到与其他设备公共接地,禁止与其他设备串联接地。接地点应尽可能*近PLC。
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