LOGO! control circuit a

(a) is the LOGO! wiring diagram; Figure (b) is the control system function block diagram. In the figure, sl~S4 are the local control switches
of the four fluorescent lamp groups Ei~E4 , and SA is the control switch of all fluorescent lamps . The light-sensitive switch can be connected directly to one of the LOG GO ! input points, or an additional switching schedule can be set ( to alternately switch off the lighting at the end of the day).