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樓主  發(fā)表于: 2016-10-11 11:56
歐姆龍PLC使用DeviceNet總線(xiàn)控制遠程模塊，如果出現遠程模塊掉電源，通信線(xiàn)斷掉等故障，DRM21單元都會(huì )報警，請問(wèn)PLC程序怎么DRM21讀取單元的故障（單元錯誤標志位是多少）？

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