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They are called ladder diagra. Draw a ladder diagram that will cause the output pilot light pl2 to be on when selector switch ss2 is closed push button pb4 is closed and limit switch ls3 is open. The process composed of three steps.
The two vertical lines are called rails and attach to opposite poles of a power supply usually 120 volts ac.
Logic gates in plc ladder logic we can construct simply logic functions for our hypothetical lamp circuit using multiple contacts and document these circuits quite easily and understandably with additional rungs to our original ladder if we use standard binary notation for the status of the switches and lamp 0. Chapter 6 ladder logic pdf version we can construct a simple logic functions for our hypothetical lamp circuit using multiple contacts and document these circuits quite easily and understandably with additional rungs to our original ladder. They are called ladder diagra. They are called ladder diagrams because they resemble a ladder with two vertical rails supply power and as many rungs horizontal lines as there are control circuits to represent.
