Placeholders STAG^ and ETAG^
Placeholder STAG^ substitutes start tags of SymbolExpression %s%, %pp%, etc.
Placeholder ETAG^ substitutes end tags of SymbolExpression %/s%, %/pp%, etc.
an example of a value assignment inside the PLC attribute using STAG^ and ETAG^ can look like this:
nUnit:=STAG^THIS^::nUnitETAG^