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getting null (was: OPC UA Syntax for Simatic.NET UA server)

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05 Sep 2019 06:46 #7704 by support
Hello,

there probably is an error, you just do not see it. In order to get the error information, add a mapping with Kind set to Exception (the type of the .NET property then needs to be an Exception) or ErrorMessage (the type of the .NET property then needs to be a String).

See:

- opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...rame.html#Mapping%20Kinds.html
- opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...n%20the%20Mapper%20Object.html


Best regards

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04 Sep 2019 10:23 - 05 Sep 2019 06:41 #7700 by Giuseppe12
I've to read data from Siemens Panel TP 900 Comfort with OPC UA.

I've set
UAEndpointDescriptor endpointDescriptor = "opc.tcp://192.168.107.12:4870";

After I've set
var mapper = new UAClientMapper();

After
mapper.Map(datiseghetto, new UAMappingContext
            {
                EndpointDescriptor = endpointDescriptor,
 
                NodeDescriptor = new UANodeDescriptor
                {                                    
                    BrowsePath = UABrowsePath.Parse("[ObjectsFolder]/WinCC Panel RT/[nsu=urn:HmiWebLink:VarProvider;ns=3;s=Tags]",  "")
                },
                MonitoringParameters = 1000, 
            });
where datiseghetto is a class
var datiseghetto = new Lettura_Seghetto();
 
[UANamespace("nsu=urn:HmiWebLink:VarProvider;ns=3")]
    [UAType]
    public class Lettura_Seghetto
    {        
        [UANode(BrowsePath = "/CED_TriggerScritturaVersoUffici"),
            UAData(Operations = UADataMappingOperations.ReadAndWrite, ValueType = typeof(string))]
        public string CED_TriggerScritturaVersoUffici;
    }
When I invoke the method
mapper.Read();

no error occurs but the value of "CED_TriggerScritturaVersoUffici" is always null.

Why ? What is wrong ?

Thanks
Giuseppe
Last edit: 05 Sep 2019 06:41 by support.

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