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omron opc reading and writing variables
29 Nov 2022 11:03 #11255
by Fietta
Replied by Fietta on topic omron opc reading and writing variables
Ok
that's the code
Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
Dim COMINCAZIONEOPCUA As String
Dim ATTRIBUTO_REQCOMMAND As UANodeDescriptor
Dim VAL_INT As Int32
VAL_INT = Val(TextBox4.Text)
COMUNICAZIONEOPCUA = "opc.tcp://172.16.253.6:4840"
ATTRIBUTO_REQCOMMAND = "nsu=http://Rxx5/UA ;ns=4;i=1168"
client.WriteValue(COMUNICAZIONEOPCUA, ATTRIBUTO_REQCOMMAND, VAL_INT)
End Sub
that's the error:
OpcLabs.EasyOpc.UA.OperationModel.UAException: An OPC-UA operation failure with error ID 'Opc.UA.ServiceResult=0x80740000' occurred, originating from 'OpcLabs.EasyOpcUA' and with depth of 1. The inner OPC-UA service exception with service result 'BadTypeMismatch' contains details about the problem. ---> OpcLabs.EasyOpc.UA.UAServiceException: OPC UA service result - {BadTypeMismatch}. The value supplied for the attribute is not of the same type as the attribute's value.
+ The attribute Id used was 'Value'.
+ The node descriptor used was: NodeId="nsu=http://Rxx5/UA ;ns=4;i=1168".
+ The client method called (or event/callback invoked) was 'WriteMultiple[1]'.
that's the screen
that's the code
Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
Dim COMINCAZIONEOPCUA As String
Dim ATTRIBUTO_REQCOMMAND As UANodeDescriptor
Dim VAL_INT As Int32
VAL_INT = Val(TextBox4.Text)
COMUNICAZIONEOPCUA = "opc.tcp://172.16.253.6:4840"
ATTRIBUTO_REQCOMMAND = "nsu=http://Rxx5/UA ;ns=4;i=1168"
client.WriteValue(COMUNICAZIONEOPCUA, ATTRIBUTO_REQCOMMAND, VAL_INT)
End Sub
that's the error:
OpcLabs.EasyOpc.UA.OperationModel.UAException: An OPC-UA operation failure with error ID 'Opc.UA.ServiceResult=0x80740000' occurred, originating from 'OpcLabs.EasyOpcUA' and with depth of 1. The inner OPC-UA service exception with service result 'BadTypeMismatch' contains details about the problem. ---> OpcLabs.EasyOpc.UA.UAServiceException: OPC UA service result - {BadTypeMismatch}. The value supplied for the attribute is not of the same type as the attribute's value.
+ The attribute Id used was 'Value'.
+ The node descriptor used was: NodeId="nsu=http://Rxx5/UA ;ns=4;i=1168".
+ The client method called (or event/callback invoked) was 'WriteMultiple[1]'.
that's the screen
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21 Nov 2022 16:15 #11224
by support
Replied by support on topic omron opc reading and writing variables
Hello,
the AttributeId is not such a big deal, in 99% of the cases what you need is UAAttributeId.Value, and that is a default that does not have to specified anyway.
But, the second argument to ReadValue should describe the UA *node* you want to read. In most cases, this is done by specifying the Node ID in its expanded string form.
Try this:
1. Start the Connectivity Explorer application that comes with QuickOPC (to get it you need to use the QuickOPC installer, not just the NuGet packages; or, it can be run from here: kb.opclabs.com/Tool_Downloads#Connectivity_Explorer ).
2. In the "Point Editor" tool window, under "Points (Composite) -> OPC Unified Architecture (Client-Server) Points", double-click on "< Double click to: Add OPC UA Endpoint >".
3. In the text area for the new node, enter opc.tcp://192.168.1.251:4840 , and press Enter.
4. Expand the new node. If the connection succeeds, you will see various nodes in a tree, and will be able to browse through them.
5. Whenever you select some node in the OPC UA server, the node info pane (below the tree) will show the title "OPC-UA Node", and some details about the node. What you are looking for is the first line, labeled "Node Id". Copy the text in there into your program (there is even a little icon do the Copy), and make it (as a string) the 2nd argument to your ReadValue call.
For example, with our sample server, you may see
and for the selected "Int16Value" node, your second argument to the ReadValue method would be "nsu=http://test.org/UA/Data/ ;ns=2;i=10847". With your server, the Node Id will be different, of course.
If your OPC Server enforces security, the connection may fail and there will be extra steps to do. This is expected, and if it happens and you do not know what to do, report the behavior and I will help to resolve it too.
Best regards
the AttributeId is not such a big deal, in 99% of the cases what you need is UAAttributeId.Value, and that is a default that does not have to specified anyway.
But, the second argument to ReadValue should describe the UA *node* you want to read. In most cases, this is done by specifying the Node ID in its expanded string form.
Try this:
1. Start the Connectivity Explorer application that comes with QuickOPC (to get it you need to use the QuickOPC installer, not just the NuGet packages; or, it can be run from here: kb.opclabs.com/Tool_Downloads#Connectivity_Explorer ).
2. In the "Point Editor" tool window, under "Points (Composite) -> OPC Unified Architecture (Client-Server) Points", double-click on "< Double click to: Add OPC UA Endpoint >".
3. In the text area for the new node, enter opc.tcp://192.168.1.251:4840 , and press Enter.
4. Expand the new node. If the connection succeeds, you will see various nodes in a tree, and will be able to browse through them.
5. Whenever you select some node in the OPC UA server, the node info pane (below the tree) will show the title "OPC-UA Node", and some details about the node. What you are looking for is the first line, labeled "Node Id". Copy the text in there into your program (there is even a little icon do the Copy), and make it (as a string) the 2nd argument to your ReadValue call.
For example, with our sample server, you may see
and for the selected "Int16Value" node, your second argument to the ReadValue method would be "nsu=http://test.org/UA/Data/ ;ns=2;i=10847". With your server, the Node Id will be different, of course.
If your OPC Server enforces security, the connection may fail and there will be extra steps to do. This is expected, and if it happens and you do not know what to do, report the behavior and I will help to resolve it too.
Best regards
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