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...Unit programming of plc structure introduction objectives relay circuits and ladder diagram sequential control using plcs charts grafcet advanced summary key words answers to saqs the language for was a carryover from diagrams used by factory technicians wiring trouble shooting hard wired cabinet basic form commonly with is this involves each program task being specified as though rung there are some graphical methods also in method what required structured approach specifying called gpl analogous flow chart high level after studying you should be able get familiar logic prepare programs techniques low power device that changes state when voltage applied coil figure shows symbolic representation application current flows magnetic motive force mmf created energize circuit once present flux air gap between steel armature core forced closed changing set s contacts i e recognized change normally open no nc opened mechatronics lighting on off lamp momentary contact push button pb switches r...