滤波，这是抗干扰的另一个主要措施。在PLC的电源电路和输入/输出电路中设置了多种滤波电路，用以对高频干扰信号进行有效抑制。对PLC的内部电源还采取了屏蔽、稳压、保护等措施，以减少外界干扰，保证供电质量。另外使输入／输出接口电路的电源彼此独立，以避免电源之间的干扰。内部设置了连锁、环境检测与诊断、Watchdog(“看门狗”)等电路，一旦发现故障或程序循环执行时间过了警戒时钟WDT规定时间(预示程序进入了死循环)，立即报警，以保证CPU可靠工作。
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