91黄动漫 I 欧美 日韩 国产 成人 在线 I a级成人毛片 I 农村黄色片 I 男生捅女生的肌肌 I 精品99一区二区三区 I 妃光莉av I 日日夜夜操操 I 性中国古装videossex I 久久不卡av I 美女高潮动态图 I 极品美女开粉嫩精品 I 牛牛精品一区二区 I 91精品福利视频 I 成人刺激视频 I 91国内精品视频 I 中国一级特黄毛片大片 I 校长狠狠挺进校花体内小说 I 欧美激情黄色片 I 欧美久久久一区 I 爱豆国产剧免费观看大全剧苏畅 I 麻豆国产人妻欲求不满谁演的 I 亚洲一区二区在线免费观看视频 I 国产超碰av人人做人人爽 I 精品国产第一国产综合精品 I 久久免费看av I 欧美一区二区三区白人 I 国产精品夫妻激情 I 校花被肉干高h潮不断 I 欧美最猛黑人xxxx黑人表情 I 国产欧美日韩一区二区搜索 I 极品女神露脸呻吟啪啪 I 人人天天久久 I 亚洲动漫在线 I 日本91福利区 I 五月天 桃色 开心 I av在线免费观看国产 I 男人添女人的免费视频 I 夜夜穞天天穞狠狠穞

'在窗體的Load事件中加入下列代碼對(duì)串口進(jìn)行初始化:
Private Sub Form_Load()
  MSComm1.CommPort = 1                  ' 設(shè)置通信端口號(hào)為COM1
  MSComm1.InputMode = 1                 ' 接收二進(jìn)制型數(shù)據(jù)
  MSComm1.RThreshold = 1                ' 設(shè)置并返回要接收的字符數(shù)
  MSComm1.SThreshold = 1                ' 設(shè)置并返回發(fā)送緩沖區(qū)中允許的最小字符數(shù)
  MSComm1.Settings = "9600,E,7,1"       ' 設(shè)置串口1通信參數(shù)
  MSComm1.PortOpen = True               ' 打開通信端口1
  Timer1.Enabled = False
End Sub
'向PLC發(fā)送指令：02 30 31 30 30 30 32 30 03 35 36，功能是從D0開始讀取32個(gè)字節(jié)數(shù)據(jù)
Private Sub Cmdsend_Click()
  MSComm1.Output = Chr(&H2) & Chr(&H30) & Chr(&H31) & Chr(&H30) & Chr(&H30) & Chr(&H30) & Chr(&H32) & Chr(&H30) & Chr(&H3) & Chr(&H35) & Chr(&H38)
  Timer1.Enabled = True
End Sub
'獲得各輸入端口狀態(tài)
Private Sub Timer1_Timer()
  Dim Inbyte() As Byte
  Dim buffer As String
  ReDim Inbyte(100)
  Inbyte = MSComm1.Input                         '返回的數(shù)據(jù)串
  For i = LBound(Inbyte) To UBound(Inbyte)
     buffer = buffer + Hex(Inbyte(i)) + Chr(32)
  Next i
  'Text1.Text = buffer                            '顯示返回的數(shù)據(jù)串，需自己添加TextBox
  If Hex(Inbyte(2)) = "31" Then                  '31表示觸點(diǎn)閉合
    Shape1(0).FillColor = QBColor(12)
  Else                                           '30表示觸點(diǎn)斷開
    Shape1(0).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(6)) = "31" Then
    Shape1(1).FillColor = QBColor(12)
  Else
    Shape1(1).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(10)) = "31" Then
    Shape1(2).FillColor = QBColor(12)
  Else
    Shape1(2).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(14)) = "31" Then
    Shape1(3).FillColor = QBColor(12)
  Else
    Shape1(3).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(18)) = "31" Then
    Shape1(4).FillColor = QBColor(12)
  Else
    Shape1(4).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(22)) = "31" Then
    Shape1(5).FillColor = QBColor(12)
  Else
    Shape1(5).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(26)) = "31" Then
    Shape1(6).FillColor = QBColor(12)
  Else
    Shape1(6).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(30)) = "31" Then
    Shape1(7).FillColor = QBColor(12)
  Else
    Shape1(7).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(34)) = "31" Then
    Shape1(8).FillColor = QBColor(12)
  Else
    Shape1(8).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(38)) = "31" Then
    Shape1(9).FillColor = QBColor(12)
  Else
    Shape1(9).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(42)) = "31" Then
    Shape1(10).FillColor = QBColor(12)
  Else
    Shape1(10).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(46)) = "31" Then
    Shape1(11).FillColor = QBColor(12)
  Else
    Shape1(11).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(50)) = "31" Then
    Shape1(12).FillColor = QBColor(12)
  Else
    Shape1(12).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(54)) = "31" Then
    Shape1(13).FillColor = QBColor(12)
  Else
    Shape1(13).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(58)) = "31" Then
    Shape1(14).FillColor = QBColor(12)
  Else
    Shape1(14).FillColor = QBColor(10)
  End If
  If Hex(Inbyte(62)) = "31" Then
    Shape1(15).FillColor = QBColor(12)
  Else
    Shape1(15).FillColor = QBColor(10)
  End If
  Timer1.Enabled = False
End Sub
'當(dāng)退出程序時(shí)，關(guān)閉串行口
Private Sub Cmdquit_Click()
  MSComm1.PortOpen = False           '關(guān)閉串口
  Unload Me
End Sub
// 讀不到PLC 輸入點(diǎn)，下標(biāo)越界，望高手指點(diǎn)修改

收藏了

反饋數(shù)據(jù)是8位數(shù)據(jù)  用串口監(jiān)測(cè)軟件看一下數(shù)據(jù)結(jié)構(gòu)應(yīng)該很好理解

為什么不用專用協(xié)議做呢？格式一或格式四都可。

不要這樣寫程序 給你推薦個(gè)官方使用的控件即可 使用方便
MX Component

用4樓方法編寫簡單

ASCII 跟 HEX 要先搞清楚。