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PLC的故障類型有哪些？
外部設(shè)備故障
外部設(shè)備就是與PLC實際過程直接聯(lián)系的各種開關(guān)、傳感器、執(zhí)行機構(gòu)、負載等。這些設(shè)備發(fā)生故障，會直接影響PLC系統(tǒng)的控制功能。因此，維修PLC，首先要分清是外部設(shè)備故障，還是PLC本身故障。
系統(tǒng)故障
1）系統(tǒng)故障是影響PLC系統(tǒng)運行的全局性故障。
2）PLC系統(tǒng)故障可以分為固定性故障、偶然性故障。
3）故障發(fā)生后，可以重新啟動使系統(tǒng)恢復(fù)正常，則就是偶然性故障。如果重新啟動不能恢復(fù)，而是需要更換硬件或軟件，系統(tǒng)才能夠恢復(fù)正常，則認為是固定性故障。
硬件故障
PLC硬件故障主要指PLC系統(tǒng)中的模板、電路損壞而造成的故障。
軟件故障
PLC軟件故障包含軟件錯誤、操作錯誤等。PLC軟件故障一般可以通過PLC本身的自診斷測試功能或者軟件來查看、檢查。
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