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西门子s7-200通讯问题

2025-03-15 16:43:00

推荐回答（1个）

回答1：

这里的通讯连接主要注意这几点
1这里的端口你有没有被其他占用比如西门子224xp 有2个com口如果你第一次写带有modbus的程序俩个是都可以下载的但是在你下进去之后第二次就只能通过其中一个没有设置modbus的口下载了这里需要注意
2 你的通讯的波特率也要一致
3 你看你的端口哪里是不是选择的usb pc/PG 接口那里选择了 ppi 然后在属性里看本地连接那是不是usb
要是还不行你就重新插拔试试。能想到的暂时就这么多了。

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