Note that the AX ST compiler complies with the IEC standard whereas the compiler in the TIA Portal is backward-compatible for the long history of PLC families. Functionality accordingly differs between the two compilers. Not all features of the STC can be supported in the TIA Portal and others will be ignored or may be transformed so that they conform to the TIA Portal feature set.
Warning
Please read the current restrictions carefully. A detailed version can be found here.