Unity pro; determine address register of a variable

Hi, I'm working on a project and building a dfb. What I need is the address-register of a variable and using it for a start-adress. (see "READ_U_PCMCIA".RCPT). I know in IEC-developer you can use "GET_INT_ADDR" and Simatic_S7 "LAR1".
Tnx,

Or is an instructionlist available for unity pro, can't find beside the help-function

Not quite sure this is the answer u r looking for. Press CTRL + I then it will open the Function Input Assistant. Now you can just type the function you want or pick from the pull down menu.