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科技改變未來(lái)
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樓主  發(fā)表于: 2017-11-22 19:34
請教各位師父一個(gè)問(wèn)題 用臺達SA2系列PLC做485通信   查了手冊M1127是通信接受完成會(huì )置位   但是實(shí)際上我已經(jīng)完成通信了  怎么它還是沒(méi)有反應  
wjpcat
悟：沒(méi)有能力拿什么守護！
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1樓  發(fā)表于: 2018-02-04 10:57
PLC做RS485通訊時(shí)，要注意很多方面，硬件方面要連接緊固，正負線(xiàn)不能反；波特率、地址、通訊格式要一致；通訊不能被干擾等等，這些做通訊時(shí)都要注意，還有一點(diǎn)就是不知道是否發(fā)出接收通訊信息，用USB-RS485通訊接頭連接PLC，或者變頻器，在PC上使用RS通訊監測軟件監控來(lái)判斷通訊異常。

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