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PLC可編程控制器

PC與歐姆龍CPM1A系列PLC的通信過程

發(fā)布日期:2022-04-26 點(diǎn)擊率:54 品牌:歐姆龍_Omron

    通信開始先由上位機(jī)依次對PLC發(fā)出一串字符的測試幀命令。為充分利用上位機(jī)CPU的時(shí)間,可使上位機(jī)與PLC并行工作,在上位機(jī)等待PLC回答信號的同時(shí),使CPU處理其它任務(wù)。某PLC在接到上位機(jī)的一個(gè)完整幀以后,首先判斷是不是自己的代號,若不是就不予理睬,若是就發(fā)送呼叫回答信號。上位機(jī)接到回答信號后,與發(fā)送測試的數(shù)據(jù)比較,若兩者無誤,發(fā)出可以進(jìn)行數(shù)據(jù)通信的信號,轉(zhuǎn)入正常數(shù)據(jù)通信,否則提示用戶檢查線路重新測試或通信失敗。

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