Variable cannot be recorded in a trace (corrected from V3.24)

Corrected from:
PLC Designer V3.24

Response of the new version:
The values of variables declared as VAR_IN_OUT variables of a function block can be recorded in a trace.
 
What happens?
The following message appears when starting a trace in the PLC Designer:
Invalid trace variable (Invalid expression (No external access to 'VAR_IN_OUT' parameter 'Variable name' of 'POU name')) 
 
When does this behaviour occur?
The above message appears if you want to record a VAR_IN_OUT variable of a function block in a trace.
 
Which products are affected?
PLC Designer from V3.0
 
Short-term measures: 
Use the variable assigned to the VAR_IN_OUT variable outside the function block for recording in a trace.
 
Evaluation/recommendations:
VAR_IN_OUT variables cannot be recorded in a trace. An applicative solution is described under 'Short-term measures'. 

URL for linking this AKB article: /en-de/go/akb/201700320/1/
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