PLC高可靠性体现在
1）所有的I/O 接口电路均采用光电隔离，使工业现场的外电路与PLC内部电路之间电气上隔离。
2）各输入端均采用R-C滤波器，其滤波时间常数一般为10~20ms。
3）各模块均采用屏蔽措施，以防止辐射干扰。
4）采用性能优良的开关电源。
5）对采用的器件进行严格的筛选。
6）良好的自诊断功能，一旦电源或其他软、硬件发生异常情况，CPU立即采用有效措施，以防止故障扩大。
7）大型PLC 还可以采用由双CPU 构成冗余系统或有三CPU 构成表决系统,使可靠性更进一步提高。
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