Get Value of Variable with Datatype 'NonatomicRead'

[ghost]

Hi,

I want to read a value of a variable with "get_value()" like i did before with other variables.
Now i get a error message with one value.

"opcua.ua.uaerrors._auto.BadAttributeIdInvalid: "The attribute is not supported for the specified Node."(BadAttributeIdInvalid)"

I compared two Variables in UA Expert and there is a difference in "AccessLevelEx" in "DataType"

The variable that worked has "CurrentRead, CurrentWrite" in AccessLevelEx
The variable with the error has "CurrentRead, CurrentWrite, NonatomicRead, NonatomicWrite"

The OPC UA Server runs on a Siemens S7. The Manual said that Nonatomic means the data is not consistent.

Can someone tell me how can i read out the Value of this type of Variables ?

I can not change the server.

Hope someone can help me.