Option Explicit
Private Sub Form_Load()
'设置本地任意可用端口，这样系统会自动分配一个未被占用的端口
Winsock1.LocalPort = 0
Winsock2.LocalPort = 0
'设置通信协议为 TCP 协议
Winsock1.Protocol = sckTCPProtocol
Winsock2.Protocol = sckTCPProtocol
'开始监听，等待客户端连接
Winsock1.Listen
Winsock2.Listen
'初始化PLC地址，IP，端口数据
Open App.Path & "\data\add.ini" For Binary As #1
Add = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
Open App.Path & "\data\ip.ini" For Binary As #1
ip = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
Open App.Path & "\data\port.ini" For Binary As #1
port = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
reg.Text = "0"
high.Text = "0"
low.Text = "0"
End Sub
Private Sub SendData_Click()
'如果 Winsock 处于已连接状态
If Winsock1.State = sckConnected Then
'构造 Modbus TCP 请求数据
Dim PLC_Add As Long
Dim dataToSend As Integer
Dim dataToSend1 As Integer
Dim dataToSend2 As Integer
'Add PLC起始地址，reg:寄存器地址，high/low高低字节位（数据）。
PLC_Add = Val(Add.Text)
To_reg = Val(reg.Text)
To_high = Val(high.Text)
To_low = Val(low.Text)
'MODBUSTCP报文
Dim request As String
request = Chr(&H0) & Chr(&H1) & Chr(&H0) & Chr(&H0) & Chr(&H0) & Chr(&H6) & Chr(&H1) & Chr(&H6) & Chr(PLC_Add - 40001) & Chr(To_reg) & Chr(To_high) & Chr(To_low)
'发送构造好的请求数据给 PLC
Winsock1.SendData request
Exit Sub
Else
'如果未连接到 PLC，弹出消息提示
MsgBox "Not connected to PLC."
End If
End Sub
Private Sub Timer1_Timer()
'定时器事件，用于周期性检查连接状态并更新界面
If Winsock1.State = sckConnected Then
'如果连接成功，将标签的背景色设置为绿色（十六进制颜色值 &HC000&）
connection.BackColor = &HC000&
Else
'如果未连接，将标签的背景色设置为红色（十六进制颜色值 &HFF&）
connection.BackColor = &HFF&
End If
End Sub
Private Sub Timer2_Timer()
'定时器事件，用于周期性检查连接状态并重新连接
If connection.BackColor = &HFF& Then
'检查 Winsock 的状态，如果不是已关闭状态
If Winsock1.State <> sckClosed Then
'关闭当前连接，以便重新连接到 PLC
Winsock1.Close
'确认连接IP地址及端口
Timer3.Interval = 1
End If
If Winsock2.State <> sckClosed Then
'关闭当前连接，以便重新连接到 PLC
Winsock2.Close
'确认连接IP地址及端口
Timer3.Interval = 1
End If
'变量
Dim plc_ip As String
Dim plc_port As Integer
'读取IP及端口参数
plc_ip = ip.Text
plc_port = port.Text
'连接到指定的 PLC IP 地址和端口号，这里需替换为实际的 PLC IP 和端口
Winsock1.Connect plc_ip, plc_port
Winsock2.Connect plc_ip, plc_port
'停止IP地址及端口确认
Timer3.Interval = 0
End If
End Sub
Private Sub Command1_Click()
'打开通讯设置窗口
Form2.Show
End Sub
Private Sub ConnectToPLC_Click()
'判断通讯是否启动连接
If Timer2.Interval = 0 Then
'开始连接
Timer2.Interval = 1
ElseIf Timer2.Interval = 1 Then
'判断通讯是否启动连接
If Winsock1.State <> sckClosed Then
'停止连接
Timer2.Interval = 0
'断开连接
Winsock1.Close
Winsock2.Close
End If
End If
End Sub
Private Sub Timer3_Timer()
'读取起始地址
Open App.Path & "\data\add.ini" For Binary As #1
'更新起始地址
Add = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
'读取IP地址
Open App.Path & "\data\ip.ini" For Binary As #1
'更新IP地址
ip = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
'读取端口
Open App.Path & "\data\port.ini" For Binary As #1
'更新端口
port = StrConv(InputB$(LOF(1), 1), vbUnicode)
Close #1
'停止更新
Timer3.Interval = 0
End Sub
Private Sub TCP0_Click(Index As Integer)
'对齐寄存器地址
If reg.Text <> 0 Then
reg.Text = 0
End If
'开关量转换
If reg.Text = 0 Then
If low.Text = 0 Then
low.Text = 1
SendData_Click
ElseIf low.Text = 1 Then
low.Text = 0
SendData_Click
End If
End If
End Sub
Private Sub TCP1_Click(Index As Integer)
'对齐寄存器地址
If reg.Text <> 1 Then
reg.Text = 1
End If
'开关量转换
If reg.Text = 1 Then
If low.Text = 0 Then
low.Text = 1
SendData_Click
ElseIf low.Text = 1 Then
low.Text = 0
SendData_Click
End If
End If
End Sub
Private Sub TCP2_Click(Index As Integer)
'对齐寄存器地址
If reg.Text <> 2 Then
reg.Text = 2
End If
'开关量转换
If reg.Text = 2 Then
If low.Text = 0 Then
low.Text = 1
SendData_Click
ElseIf low.Text = 1 Then
low.Text = 0
SendData_Click
End If
End If
End Sub
Private Sub TCP3_Click(Index As Integer)
'对齐寄存器地址
If reg.Text <> 3 Then
reg.Text = 3
End If
'开关量转换
If reg.Text = 3 Then
If low.Text = 0 Then
low.Text = 1
SendData_Click
ElseIf low.Text = 1 Then
low.Text = 0
SendData_Click
End If
End If
End Sub
Private Sub TCP4_Click(Index As Integer)
'对齐寄存器地址
If reg.Text <> 4 Then
reg.Text = 4
End If
'开关量转换
If reg.Text = 4 Then
If low.Text = 0 Then
low.Text = 1
SendData_Click
ElseIf low.Text = 1 Then
low.Text = 0
SendData_Click
End If
End If
End Sub
Private Sub TCP5_Click(Index As Integer)
'对齐寄存器地址
If reg.Text <> 5 Then
reg.Text = 5
End If
'开关量转换
If reg.Text = 5 Then
If low.Text = 0 Then
low.Text = 1
SendData_Click
ElseIf low.Text = 1 Then
low.Text = 0
SendData_Click
End If
End If
End Sub
Private Sub end_Click()
End
End Sub
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