所有PLC错有问题还是只一个PLC有问题[?试着与多站系统中其它PLC连接。如果与任何-一个都不能连接,检查常见的问题如电缆本身缺陷。如果能与其它PLC连接,只是与某个PLC不能连接。采用直接连接方式如下一-段落所述。同样,如果只是多站链路中最后一个PLC出现问题,可能是最后一部分的电缆有问题。或者,你能与某一点上游的所有PLC连接,但与该点下游的所有PLC都不能连接,那么强烈建议检查是否这部分电缆有问题。
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