SVCREQ功能模块有三个输入参数和一个输出参数。当SVCREQ接受能流后,则要求PLC完成指定的功能FNC。有关功能模块的参数从为PARM给出的参考地址开始。除非是–不正确的功能号数。不正确的参数或超出特定的参考地址范围,SVCREQ功能模块均将通流。其它故障原因将在后而加以介绍。
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