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西門子 200plc 通過(guò) modbus 協(xié)議與組態(tài)王通訊，需要注意哪些事項(xiàng)？
需要注意如下幾點(diǎn)：
1）需要向 PLC 中下載對(duì)應(yīng)的初始化程序（KVmoddbus.mwp），由亞控提供。此程序默認(rèn)的 plc 通訊端口為 port0，地址為 2，波特率 9600，無(wú)校驗(yàn)（地址和波特率可由程SBR0 中的 VB8，SMB30 進(jìn)行修改）；
2）由于 PLCModbus 協(xié)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(xié)議中所占用的 V 區(qū)地址沖突；
3）西門子 S7200PLC 和通過(guò) modbus 協(xié)議和組態(tài)王通訊時(shí)，CPU 上的開關(guān)必須撥在RUN 狀態(tài)，否則 PLC 中的 modbus 通訊程序沒(méi)有處于運(yùn)行狀態(tài)，組態(tài)王和設(shè)備通過(guò)自由口協(xié)議肯定通訊失敗。
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