西門子 200plc 通過 modbus 協議與組態王通訊，需要注意哪些事項？
需要注意如下幾點：
1）需要向 PLC 中下載對應的初始化程序（KVmoddbus.mwp），由亞控提供。此程序默認的 plc 通訊端口為 port0，地址為 2，波特率 9600，無校驗（地址和波特率可由程SBR0 中的 VB8，SMB30 進行修改）；
2）由于 PLCModbus 協議程序占用 V1000 及以前的地址，所以用戶在編寫邏輯控制程序中用到的寄存器不能和亞控提供的協議中所占用的 V 區地址沖突；
3）西門子 S7200PLC 和通過 modbus 協議和組態王通訊時，CPU 上的開關必須撥在RUN 狀態，否則 PLC 中的 modbus 通訊程序沒有處于運行狀態，組態王和設備通過自由口協議肯定通訊失敗。
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