西门子 200Plc 通过 PPI 协议与组态王通讯失败，为何？
请检查如下设置是否正确：
1）用户编程电缆的拨码设置：在编程电缆的拨码中，第 5 个端子是设置通讯协议的：拨码设置为 0，表示 PPI/Freeport ；拨码设置为 1，表示 PPI(master)；用户使用 PPI 协议和组态王通讯时，拨码选择 PPI/Freeport 对应拨码值即可；
2）PPI 通讯传输的是 11 位的数据，也就建议客户拨码选择 8 数据位 1 停止位偶校验（拨码默认为 11 位），并且 PLC 的波特率和 PPI、组态王要一致；
3）要求编程软件必须是离线时启动运行组态王。
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