1783-SFP100LX
1783-SFP100LX
1783-SFP100LX
对电磁干扰较强、而对PLC可靠性要求又较高的场合，PLC的供电应与动力供电和控制电路供电分开；必要时，可采用带屏蔽的隔离变压器供电、串联LC滤波电路等。在设计时，外接的直流电源应采用稳压电源，供电功率应留有20%~30%的余量。对由控制器本身提供的直流电源，应了解它所能提供的***大电流，防止过电流造成设备的损坏。
1.3 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，采用专用接地；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。
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