Hello nikolaj@automatio...

Do not throw things at me but this is a system behaviour. Check the Manual:

https://support.industry.siemens.com/cs/ww/en/view/109813306/109377913227

--------------

Note

Current system behavior for dynamic access to elements of a user data type

When you compose the tag name of a user data type element dynamically in Runtime, the composed tag name isnotrecognized under the following condition:

• Tag of the data type of the user data type is created.

• Tag isnotused, e.g. at an I/O field

Example:

You have configured a user data type "Motor" with the elements "RPM" (Int), "On" (Bool) and "Off" (Bool). In the project, you have configured the tag "Motor1" as instance of the user data type. You want to output the values of the elements in only one I/O field in runtime. You have configured an additional I/O field for input of the element name. The value you enter is saved to the internal tag strElementName. With the following script you output the value of an element in the I/O field "IOFieldOutputValue":

Dim strDynElementName, objIOFieldOutputValue

Set objIOFieldOutputValue = objscreen.ScreenItems("IOFieldOutput")

'Get element name from tag value

strDynElementName = SmartTags("strElementName").Value

'Create tag name

objIOFieldOutputValue.ProcessValue = SmartTags("Motor1."+strDynElementName).Value

Help:

Configure a separate I/O field for each user data type element, for example, in an additional screen. Interconnect the "process value" with the respective user data type element.

 ---------

Bye Murof