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06/21/2026
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We developed an OPC-UA server for internal use. Our goal is to communicate with this OPC-UA server using an OPC-UA Client adapter of Siemens Opcenter Connect MOM. During tests with MOM we discovered that when we try to call the OPC-UA method we get the following exception "Method Call Exception: The DataType does not have a DefaultBinary Encoding.".
To validate if our OPC-UA server is compliant with the OPC-UA standard I started testing with the 'UACTT Lite' test tool. However as soon as I try to execute a method call test script I get the error CallService does not exist. After some digging I discovered that I do not have the Call.js file which should be in the following location according to the documentation which is included with the 'UACTT Lite' test tool:
Location: /project>/library/Base/ServiceBased/MethodServiceSet/Call.js
So now I'm wondering is it even possible to test an OPC-UA method call with UACTT Lite or is this only supported in the full version?
Any help is appreciated.
Regards,
Erik
05/30/2017
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You can use any UA client such as UAExpert to connect to Server and call the method.
If that works it is client side issue.
The issue is you have likely created a DataType Node which is used as an argument in the Method.
This DataType Node needs to have an associated DataTypeEncoding Node. If your Server does not return a HasEncoding reference when the DataType is browsed then that would explain the issue.
06/21/2026
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Hi Randy,
We already tested with UAExpert and with that tool we are able to execute the method call. However according to Siemens the method call executed by Opcenter Execution MOM fails because our custom created 'DataType -> BaseDataType -> Structure -> FieldObject' does not return HasEncoding. This is also confirmed when browsing to FieldObject with UAExpert.
Because we now have internally a discussion in whether or not the problem is on the OPC-UA server side or in Siemens Opcenter Connect MOM I wanted to use the UACTT Lite test tool so that it maybe would confirm the feedback of Siemens that the OPC-UA Server is not compliant to the standard.
Is it possible to also answer my initial question if it is possible to test an OPC-UA method call with UACTT Lite?
Regards,
Erik
05/30/2017
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Ok - if HasEncoding is not present in the Server then the Server is the problem.
Not every client will look for it but it is required if you are returning exchanging instances over the wire.
Specification is fairly clear:
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