西门子S7-200与上位机通讯，读取温度值的

MSComm1.InBufferCount = 0                 '清空接收缓冲区
End Sub
Private Sub Timer1_Timer()                               '定时器1有效，触发接收事件 
字串8

MSComm1.PortOpen = True                                  '打开端口
ReDim aa(0 To 5)                                         '定义动态数组
k1 = 0                                                   '识别PLC站号，为1
If k1 = 0 Then MSComm1.Output = "1" + Chr(10) + Chr(13)  '发送
Do While MSComm1.InBufferCount = 0                       '准备接收数据 
字串4

Loop
aa = MSComm1.Input                                        '接收数据存入数组
If aa(0) > 64 Then GoTo xxx:
k2 = Int(aa(0) * 255 + aa(1) * 1)
Select Case k2
Case 1
p11 = Int(aa(2) * 255 + aa(3) * 1)
p22 = Int(aa(4) * 255 + aa(5) * 1)
Case Else
End Select
k1 = k1 + 1
If k1 > 2 Then k1 = 0
xxx:
MSComm1.PortOpen = False
End Sub
Private Sub Timer2_Timer()                      '绘制各中频炉的温度曲线
x1 = x1 + 1                                     '时间增加为1S
Picture1.PSet (x1, p11), vbRed                  '绘制1#炉的温度曲线，为红色 
字串9

Picture1.PSet (x1, p22), vbBlue                 '绘制2#炉的温度曲线，为黄色
Text1.Text = Str(p11)                           '输出1#炉温度值
Text2.Text = Str(p22)                           '输出2#炉温度值
Text3.Text = Str(x1)                             '输出监控时间
End Sub

 

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本文关键字：西门子  西门子plc应用，plc技术 - plc应用 - 西门子plc应用