The PLC has a certain resistance to the interference caused by the power line.In environments with high reliability requirements or particularly severe power supply interference,an isolation transformer with a shielding layer can be installed to reduce the interference between the equipment and the ground.Generally,the PLC has a DC 24V output to provide the input terminal.When the input terminal uses an external DC power supply,a DC stabilized power supply should be selected.Because of the common rectifier filter power supply,it is easy for the PLC to receive wrong information due to the influence of the ripple.
PLC对于电源线带来的干扰具有一定的抵制能力。在可靠性要求很高或电源干扰特别严重的环境中,可以安装一台带屏蔽层的隔离变压器,以减少设备与地之间的干扰。一般PLC都有直流24V输出提供给输入端,当输入端使用外接直流电源时,应选用直流稳压电源。因为普通的整流滤波电源,由于纹波的影响,容易使PLC接收到错误信息。
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