國產(chǎn)PLC—Haiwell（海為）PLC與VB通訊源程序講解

2008-05-07 11:09:14 haiwell 1030

在做自動化工程項目時常常需要用上位機對PLC進行監(jiān)控，如果是大的工程項目可以使用組態(tài)軟件來完成，但對中小項目為了節(jié)約成本，可以采用自己寫上位機程序來完成對PLC的監(jiān)控。

海為提供了一個海為PLC的通訊控件，通過這個控件實現(xiàn)上位機與海為PLC之間的通訊十分方便，它封裝了Modbus通訊協(xié)議和HaiwellBus協(xié)議，以點的形式實現(xiàn)對海為PLC的數(shù)據(jù)訪問，對每個點可以定義它的名稱/數(shù)據(jù)類型/小數(shù)長度/點注釋等，不必去了解Modbus通訊協(xié)議和HaiwellBus協(xié)議的具體內(nèi)容，只要有上位機編程經(jīng)驗就可以完成。

海為PLC的通訊控件和例子源程序可以到海為網(wǎng)站（http://www.www.ccgew.cn/download.asp）的“下載中心”下載。

下面以VB為例介紹該控件的使用，新建一個VB工程，添加2個窗口:

lQLPJxaJeo9MmU3NATLNAjCwLOMkAFDexwEC4k-9_sAnAA_560_306.png

lQLPJxaJeo9MmT_M2M0BdLAEmitl4IqTugLiT74KgNIA_372_216.png

窗口1的程序如下：

Option Explicit

'啟動跑馬燈按鈕

Private Sub Command1_Click()

'啟動跑馬燈，M0置1，點序號30

HWPLCComm1.HWPLCs(1).SetPointValue 30, 1

End Sub

'停止跑馬燈按鈕

Private Sub Command2_Click()

'停止跑馬燈，M1置1，點序號31

HWPLCComm1.HWPLCs(1).SetPointValue 31, 1

End Sub

'啟動采樣按鈕

Private Sub Command3_Click()

' HWPLCComm1是海為PLC通訊控件名稱，Timer1是畫面刷新定時器

HWPLCComm1.Run Not HWPLCComm1.RunFlag

Timer1.Enabled = HWPLCComm1.RunFlag

If HWPLCComm1.RunFlag Then

Command3.Caption = "停止采樣"

Shape2.FillColor = vbGreen ‘采樣指示燈綠色

Else

Command3.Caption = "啟動采樣"

Shape2.FillColor = vbWhite ‘采樣指示燈紅色

End If

End Sub

'窗口1裝載

Private Sub Form_Load()

Dim i As Long

'添加1臺PLC，PLC地址為1，名稱為“1號PLC”

HWPLCComm1.HWPLCs.AddPLC 1, "1號PLC"

'在“1號PLC”下增加采樣點

For i = 0 To 15

HWPLCComm1.HWPLCs(1).AddPoint "y" & i '增加采樣點Y0-Y15

Next i

'在“1號PLC”下增加其他離散的采樣點

HWPLCComm1.HWPLCs(1).AddPoint "sv0", , "當(dāng)前掃描時間單位0.1ms"

HWPLCComm1.HWPLCs(1).AddPoint "sv1", , "最小掃描時間單位0.1ms"

HWPLCComm1.HWPLCs(1).AddPoint "sv2", , "最大掃描時間單位0.1ms"

HWPLCComm1.HWPLCs(1).AddPoint "sv12", "Year", "年"

HWPLCComm1.HWPLCs(1).AddPoint "sv13", "Month", "月"

HWPLCComm1.HWPLCs(1).AddPoint "sv14", "Day", "日"

HWPLCComm1.HWPLCs(1).AddPoint "sv15", "Hour", "時"

HWPLCComm1.HWPLCs(1).AddPoint "sv16", "Minute", "分"

HWPLCComm1.HWPLCs(1).AddPoint "sv17", "Second", "秒"

HWPLCComm1.HWPLCs(1).AddPoint "sv18", "Week", "星期"

HWPLCComm1.HWPLCs(1).AddPoint "sm3", , "10ms時鐘脈沖"

HWPLCComm1.HWPLCs(1).AddPoint "sm4", , "100ms時鐘脈沖"

HWPLCComm1.HWPLCs(1).AddPoint "sm5", , "1s時鐘脈沖"

HWPLCComm1.HWPLCs(1).AddPoint "m0", "Start", "跑馬燈啟動"

HWPLCComm1.HWPLCs(1).AddPoint "m1", "Stop", "跑馬燈停止"

HWPLCComm1.HWPLCs(1).AddPoint "v0"

HWPLCComm1.HWPLCs(1).AddPoint "v2"

HWPLCComm1.HWPLCs(1).AddPoint "v100", , "實數(shù)例子", [REAL ] '實數(shù)類型為5

HWPLCComm1.HWPLCs(1).AddPoint "ccv50", , "32位計數(shù)器"

HWPLCComm1.HWPLCs(1).AddPoint "ccv100", , "16位計數(shù)器"

'將點加到Listview中顯示, Y0-Y15 16個點不加入，用指示燈來顯示狀態(tài)

Dim Newitem As ListItem

For i = 17 To HWPLCComm1.HWPLCs(1).PointCount

Set Newitem = ListView1.ListItems.Add(, , i)

Newitem.SubItems(1) = HWPLCComm1.HWPLCs(1).iPoints(i).PointAddress

Newitem.SubItems(2) = HWPLCComm1.HWPLCs(1).iPoints(i).PointName

Newitem.SubItems(4) = HWPLCComm1.HWPLCs(1).iPoints(i).PointNote

Next i

'將PLC地址和名稱用標(biāo)簽顯示

Label3(0) = HWPLCComm1.HWPLCs(1).PLCAddress

Label3(1) = HWPLCComm1.HWPLCs(1).PLCName

'將16只指示燈的標(biāo)簽以點名稱顯示（Y0~Y15）

For i = 1 To 16

Label1(i - 1) = HWPLCComm1.HWPLCs(1).iPoints(i).PointName

Next i

End Sub

'雙擊列表中的點打開窗口2，對該點的值進行修改

Private Sub ListView1_DblClick()

Dim i As Long

If Not ListView1.SelectedItem Is Nothing Then

i = ListView1.SelectedItem.Index + 16

Form2.vPointIndex = i

Form2.Caption = "寫入值 " & HWPLCComm1.HWPLCs(1).iPoints(i).PointName

Form2.Label1.Caption = "寫入值 " & HWPLCComm1.HWPLCs(1).iPoints(i).PointName & "："

Form2.Text1 = HWPLCComm1.HWPLCs(1).iPoints(i).PointValue

Form2.Show 1

End If

End Sub

' Timer1是畫面刷新定時器

Private Sub Timer1_Timer()

'刷新值

Dim i As Long

'刷新Y0-Y15值

For i = 1 To 16

If HWPLCComm1.HWPLCs(1).iPoints(i).PointValue = 1 Then

Shape1(i - 1).FillColor = vbRed '值=1，為真

Else

Shape1(i - 1).FillColor = vbWhite '值=0，為假

End If

Next i

'刷新其他點值

For i = 17 To HWPLCComm1.HWPLCs(1).PointCount

ListView1.ListItems(i - 16).SubItems(3) = HWPLCComm1.HWPLCs(1).iPoints(i).PointValue

Next i

End Sub

窗口2的程序如下：

Option Explicit

Public vPointIndex As Long '公共變量，存儲被雙擊點的序號

'確定按鈕

Private Sub Command1_Click()

If Text1.Text = "" Then Exit Sub

'按確定，則寫入點的值

Form1.HWPLCComm1.HWPLCs(1).SetPointValue vPointIndex, Text1.Text

Unload Me

End Sub

'取消按鈕

Private Sub Command2_Click()

Unload Me

End Sub

Private Sub Text1_GotFocus()

Text1.SelStart = 0

Text1.SelLength = Len(Text1)

End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)

If KeyAscii = 13 Then

Command1_Click

End If

End Sub

運行結(jié)果如下圖：

lQLPJxaJeo9Ml9DNAUrNAjCwcnyozf1ciXgC4k-92ICEAA_560_330.png