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SYNTAX:
 
xpxTestAttr (instanceId , attrId : GENERIC;
              VAR isSet           : BOOLEAN)             status              : INTEGER;
 
The xpxTestAttr function returns TRUE in the isSet argument if the specified attribute attrId in the specified instance instanceId has a value, else the isSet argument is set to FALSE. An attribute is assigned a value by a put function like xpxPutAttr, xpxPutAttrs etc.
This function is equivalent to the EDMinterface function sdaiTestAttr

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