SVCREQ功能模塊有三個輸入?yún)?shù)和一個輸出參數(shù)。當(dāng)SVCREQ接受能流后,則要求PLC完成指定的功能FNC。有關(guān)功能模塊的參數(shù)從為PARM給出的參考地址開始。除非是–不正確的功能號數(shù)。不正確的參數(shù)或超出特定的參考地址范圍，SVCREQ功能模塊均將通流。其它故障原因?qū)⒃诤蠖右越榻B。

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