Simon, I'm a newbie to Unitronics, but not with other plc's, specifically Omron and Koyo. My preferred method of programming is sequence control. Omron: STEP\SNXT, Koyo: SG\JMP. Would you be willing to share a small program you have written in this style (using as you say, subroutines) in Visilogic, to help me learn how to do it with Unitronics?