Have so interesting problem. I want to use PID inside function block. PID needs parameters area which contains internal varibales of PID. Indirect addressation in FB is not working (I tryed to write commands like MOV #1 @D0 - compiller not understand it.) Sending each parameter to FB as words is not best solution, because PID have so many parameters. But in this choice I can't make one area of words, FB compiler can make parameters in different places. Have I use internal FB arrays or there are any other solutions for that situation?