I/O模块的更换

当需要替换某个模块时，用户应确认要安装的模块是否同类型。有些I/O系统允许带电更换模块，而有些则需切断电源更换。若更换完，在相对较短时间后又发生故障，那么应检查产生电压的感性负载。若更换后，保险丝易被烧断，则有可能是模块的输出电流超限，或输出设备被短路。

PLC的故障诊断十分重要，本文对常用的故障诊断方法进行了探讨。在实际工作过程中，应充分考虑到各种对PLC的不利因素。对PLC进行定期检查和日常维护，是保证PLC控制系统正常、安全、可靠运行的关键。

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