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xiazaiya
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樓主  發(fā)表于: 2020-05-12 05:50
S7 226本體無(wú)擴展，因為上位機用MOdbusRtu方式通訊無(wú)法讀寫(xiě)輔助繼電器M點(diǎn)，所以用無(wú)實(shí)際物理點(diǎn)的Q4.0以后的輸出點(diǎn)作為輔助繼電器使用，監視跑程序無(wú)問(wèn)題，對相應虛擬Q點(diǎn)右鍵寫(xiě)入值時(shí)程序也正常，但通過(guò)串口調試助手寫(xiě)相應虛擬Q點(diǎn)時(shí)，程序未如期響應，如果通過(guò)串口助手寫(xiě)實(shí)際Q點(diǎn)時(shí)能會(huì )看到相應Q點(diǎn)會(huì )有非常短暫的接通輸出，請教這是為什么，要通過(guò)modbus 控制程序還有什么方法
tkggtdkjpl
工欲善其事，必先利其器！
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1樓  發(fā)表于: 2020-05-18 10:31
讀不到M點(diǎn)用V0.0代替
自動(dòng)化單機，生產(chǎn)線(xiàn)，項目編程調試！

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