ixo65

In attachment a possible solution.

 thanks a lot, I'm checking your program. please see attachment.

for example when operator select 30v for output of power, the electronic board needs to 5v from controller(LOGO), at the welding process if voltage decreases, LOGO must increase Analog Output Value and if voltage increases, LOGO must decrease Analog Output Value. we need a constant voltage.

thank you

ixo65

My opinion:

Forget your idea to solve the problem (welding machine) with a LOGO!.

That's why I had already asked you for details about the process.

 what do you think? is it possible?