基于vb的臺達plc與監(jiān)控計算機的串行通信實現(xiàn)(參考版)
2025-06-28 14:44本頁面
【正文】 。臺達PLC采用標準的目前廣為流行的MODBUS協(xié)議，為實現(xiàn)PLC與監(jiān)控計算機的通信提供了簡化的平臺。D256，D512數(shù)據(jù)寫入的操作類似，限于篇幅其它代碼就不再列出了。13為D，10為A = strout = TrueEnd Sub39。strout = : + str + LRCC + Chr$(13) + Chr$(10) 39。LRCC = LRC(str) 39。39。M1072 為PLC起動停止標志位。redEnd IfEnd Sub（4） PLC的起動與停止39。PLC為停止標志End IfIf plc = 1 Then = PLC正在運行...... = RGB(0, 255, 0) 39。PLC為停止標志End IfEnd Sub（3） 下面一段為用指示燈表示PLC的運行狀態(tài)Private Sub Timer5_Timer()Dim s1 As StringDim s2 As StringDim s22Dim s3 As StringDim s4 As Strings2 = 01010C300001s22 = LRC(s2)s1 = : + s2 + s22 + Chr$(13) + Chr$(10) = s1s3 = s4 = Mid$(s3, 8, 2)If s4 = 31 Thenplc = 1 39。初次運行打開串口，并顯示PLC運行狀態(tài)Private Sub Form_Load()Dim s1 As StringDim s2 As StringDim s22 As StringDim s3 As StringDim s4 As String = Trues2 = 01010C300001s22 = LRC(s2)s1 = : + s2 + s22 + Chr$(13) + Chr$(10) = s1s3 = s4 = Mid$(s, 6, 8)If s4 = 0C30FF00 Thenplc = 1 39。H100End Ifh_lrc = Hex(amp。H + c_data)c = c + 1
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