本文对电磁干扰及其对PLC控制系统干扰的原理进行分析,指出在PLC应用时必须综合考虑的抗干扰性能及影响,并结合港机场桥电控PLC应用提出相应抗干扰措施。 In this paper, the electromagnetic interference and its interference principle of PLC control system are analyzed. It is pointed out that the anti-interference performance and its impact that must be considered in PLC application are pointed out and the corresponding anti-interference measures are put forward in combination with the application of PLC in Hong Kong Airport Bridge.