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永不放棄hhj
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樓主  發(fā)表于: 2024-12-03 11:17
用三菱3u 做Modbus通訊時(shí),用m8002上電初始化,自動(dòng)檢測從站數量,這個(gè)程序如何寫(xiě)。我準備用for循環(huán)向從站發(fā)送開(kāi)機狀態(tài)報文,依據有沒(méi)有返回報文,來(lái)確定從站是不是存在。不知道前輩們是怎么處理這個(gè)問(wèn)題的
格林
我聽(tīng)到了花開(kāi)的聲音,也看到了花落的結局.
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1樓  發(fā)表于: 2024-12-13 16:29
已知MODBUS從站的站號范圍是1-247,首先向1號站發(fā)送命令,得到1號站回應后將計數變量+1,然后站號+1繼續發(fā)送命令,得到2號站回應后計數變量又+1,如果某個(gè)站號通信失敗則不對計數變量進(jìn)行自加,從1-247全部跑完一遍后觀(guān)察計數變量的值是多少就說(shuō)明有多少個(gè)從站應答,周而復始,別忘了對計數變量清零哈。

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