Hi Friends,

I want to make the Parameter Passing Instruction Program in STEP 7. 

Right now, I'm working in "Chiller System" Project-Unit 2" by S7 400 system. The Unit-1 was developed by Rockwell System.

Our Client asking to use that same (unit-1) logic in unit-2.

That Logic was developed by using "Parameter Passing Instruction (JSR, SBR, and RET)". I have attached sample program for your reference. 

I don't know, how to use this JSR, SBR and RET instruction in STEP 7.

Anybody can help me? How to make the Parameter Passing Instruction Program in STEP 7?

Thanks & Regards,

Prakash.M