Well, I leave the video of the application in vb.net working.
Web washing machine 2.0
I have modified the class in charge of communicating with the plc. In this case we will call the variables by their name. This is the class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | Imports TwinCAT. Ads PublicClass ClassAds PrivateAs TcAdsClient DimAs AdsState Enum AdsState Disconnected ErrorConnectconnectedOk EndEnum "PLC ADS" PublicFunction Connect()AsString Try =New TcAdsClient adsClient. Connect("192.168.255.2.1.1"801) adsClient. Timeout=5000 If adsClient. Readstate. AdsState. ToString="Run"Then = AdsState. ConectadoOk else = AdsState. ErrorConect EndIf Return adsClient. Readstate. AdsState. ToString Catcherras exception = AdsState. ErrorConect Return"Error" EndTry EndFunction PublicFunction ValorIntPorName(ByValAsString) DimAs AdsStream DimAs AdsBinaryReader Try 'Recover Var Number DimAsInteger = adsClient. CreateVariableHandle(Name) =New AdsStream(2) adsClient. Read(Var, dataStream) =New AdsBinaryReader(dataStream) Return Read. ReadInt16 catcherras exception = adsState. ErrorConect Return0 EndTry EndFunction PublicFunction txtName(ByValAsString) DimAs AdsStream DimAs AdsBinaryReader DimAsString DimAsInteger Try 'Recover Var Number DimAsInteger = adsClient. CreateVariableHandle(Name) =New AdsStream(31) = adsClient. Read(Var, dataStream) =New AdsBinaryReader(dataStream) 'txt = Read.ReadString =NewString(Read. ReadChars(length)) 'txt = txt. Substring(0, txt. IndexOf("\0")) Return txt catcherras exception = AdsState. ErrorConect Return0 EndTry EndFunction PublicSub WriteBoolPorName(ByValAsStringByValAsBoolean) DimAs AdsStream DimAs AdsBinaryWriter Try'Recuperar Numero Var DimAsInteger = adsClient. CreateVariableHandle(Name) =New AdsStream(1) =New AdsBinaryWriter(dataStream) Write. Write(Value) adsClient. Write(var, dataStream) Catcherras exception = AdsState. ErrorConect EndTry EndSub PublicSub Disconnect() If= Adsstate. ConectadoOkThen adsClient. Dispose() = AdsState. Disconnected EndSub PublicFunction StateAds()AsString If= AdsState. ConectadoOkthen return1 else return0 endif endfunction #End region endclass |
To be able to read the variables by name, what we do is retrieve the Value that identifies this variable. We do this with the following function:
Var = adsClient.CreateVariableHandle(Name)
Name is the name of the variable. For global variables we will call them by . VariableName and for the rest ProgramName.VariableName.
I have created an enumeration to define the states of communication. And a new function to retrieve text from the plc. Specifically I am interested in the variable MAIN.txtWarning, this variable informs us of the current state of the sequence.
This is the code of the main form:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | PublicClass Form1 DimAsNew ClassAds PrivateSub buConectar_Click(ByValAs System. ObjectbyValas system. EventArgs)Handles buConnect. Click Plc1.Connect() Timer1. Enabled=True EndSub PrivateSub buDesconectar_Click(ByValAs System. ObjectbyValas system. EventArgs)Handles buDesconnect. Click If Plc1.StateAds=1Then Plc1.Disconnect() EndSub PrivateSub Timer1_Tick(ByValAs System. ObjectbyValas system. EventArgs)Handles Timer1. Tick Timer1. Enabled=False If Plc1.StateAds 1Then MessageBox. Show("Error Ads") ExitSub EndIf laTemp. Text="Temperature= "& Plc1.IntValueByName(". Temperature")&"ºC" laNivelAgua. Text="Water Level= "& Plc1.ValueIntByName(". Water Level") theState. Text= Plc1.txtByName("MAIN.txtWarning") pbM1. Visible= plc1.ValueIntByName(". M1") pbPump. Visible= pbM1. Visible pbM2. Visible= plc1.ValueIntByName(". M2") pbY1. Visible= plc1.ValueIntByName(". Y1") pbY2. Visible= plc1.ValueIntByName(". Y2") pbX1. Visible= plc1.ValueIntByName(". X1") ImgFondo(Plc1.ValueIntPorName(". CajonCerrado")) Timer1. Enabled=true endsub privatesub imgFondo(byValasinteger) ifthen pbFondo. ImageLocation=".. /.. /Resources/LavPreparada.png" Else pbFondo. ImageLocation=".. /.. /resources/TodoParado.png" EndIf EndSub PrivateSub buMarcha_Click(ByValAs System. ObjectbyValas system. EventArgs)Handles buMarcha. Click If Plc1.StateAds 1ThenExitSub Plc1.WriteBoolByName(". End Sub PrivateSub Sub buCerrarCajon_Click(ByValAs System. ObjectbyValas system. EventArgs)Handles buCloseBox. Click If Plc1.StateAds 1ThenExitSub Plc1.WriteBoolByName(". CajonClosed"True) Plc1.WriteBoolByName(". DoorClosed"True) EndSub PrivateSub buAbrirCajon_Click(ByValAs System. ObjectbyValas system. EventArgs)Handles buAbrirCajon. Click If Plc1.StateAds 1ThenExitSub Plc1.WriteBoolByName(". CajonClosed"False) Plc1.WriteBoolByName(". DoorClosed"False) EndSub PrivateSub Form1_Disposed(ByValAsObjectByValAs System. EventArgs)HandlesMe. Disposed If Plc1.StateAds=1Then Plc1.Disconnect() EndSub EndClass |
This code doesn't have much history. It's about establishing the connection. Using a timer, read the status of the motors and valves, to show or not the pictureBox. The background image is changed using the ImgFondo function, depending on the state, showing one or another image. The rest of the code is the events of the Buttons to open/close or start the washing machine.
Here, I leave both the plc program and the application in vb.net. Remind you to change the AMS address in ClassAds. To continue with our project we will have to start the web server and create the functions (vb.net) to record in the database.
Authors: David
