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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
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'programmer so I do not know what is going on. 'As you see label1 is using values(1), it should be values(0).
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'I added 6 items with success but I cannot read the six items. 'There seems to be some issue with zero based arrays and one based arrays. Opc_Group.SyncRead(OPCDataSource.OPCCache, 5, ServerHandles, Values, Errors, Qual, TimeValue) ServerHandles(i) = opc_items(i).ServerHandle If Not (opc_Server.ServerState = OPCServerState.OPCRunning) Then 'safety Private Sub ReadTimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ReadTimer.Tickĭim ServerHandles As Array = Array.CreateInstance(GetType(Int32), itemCount) 'item ID (server side)ĭim Values As Array = Array.CreateInstance(GetType(Object), itemCount) 'return valuesĭim Errors As Array = Array.CreateInstance(GetType(Int32), itemCount)ĭim Qual As Array = Array.CreateInstance(GetType(Object), itemCount)ĭim TimeValue As Array = Array.CreateInstance(GetType(Object), itemCount) Opc_Server.Disconnect() 'disconnect from the OPC Server Private Sub DisconnectBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DisconnectBtn.Click ReadTimer_Tick(sender, e) 'we can start reading MsgBox("OPC server connection failed", vbCritical, "") MsgBox("Server not created", vbCritical, "") Private Sub ConnectBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ConnectBtn.Click 'you must have the OPC DA Automation wrapper has a reference. I have never written one in VB that uses the custom interfaces. Here is a sample that uses the automation interface.
KEPWARE KEPSERVEREX FAILED TO CONNECT CODE
Can anyone guide me with Data Read/Write Code ? So far there are no problems with this code. MessageBox.Show("OPC server disconnect failed: " + ex.Message, "Exception", MessageBoxButtons.OK) MessageBox.Show("OPC Server is disconnected") If Not ConnectedOPCServer Is Nothing Then MessageBox.Show("OPC server remove group failed: " + ex.Message, "Exception", MessageBoxButtons.OK) MessageBox.Show("OPC server add group failed: " + ex.Message, "Exception", MessageBoxButtons.OK) MessageBox.Show("OPC server connect failed: " + ex.Message, "Exception", MessageBoxButtons.OK)Ĭ = TrueĬ = 0ĬonnectedGroup = ("A") MessageBox.Show("OPC Server is Connected") I have written the following code for connection/ disconnection of OPC ServerĬonnectedOPCServer = New OPCAutomation.OPCServerĬonnectedOPCServer.Connect("OPC.SimaticNet.1") _Tag is a tag known to exist in the Kepware server (e.g.I am using MS Visual Studio 2010 for creating a OPC DA Client (VB).
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Invalid class string + The client method called was 'ReadMultipleItemValues'. The inner exception contains details about the problem. Searches at OPC Labs for the error code (0x800401F3) have not proven very helpfulĪn OPC operation failure with error code -2147221005 (0x800401F3) occurred, originating from '' and with depth of 1. Server is Kepware (6) running on the same computer
KEPWARE KEPSERVEREX FAILED TO CONNECT WINDOWS
Windows 10, Visual Studio Enterprise 2019, Winforms, c# Private readonly EasyDAClient _client = new EasyDAClient() This is the culprit: object x = _client.ReadItemValue( _Machine, _Server, _Tag )