![]() ![]() With such a diagram the power supply for the circuits is always shown as two vertical lines with the rest of the circuit as horizontal lines. Figure 1 – Ways of drawing the same electrical circuit The circuit shown in Figure 1b is termed a ladder diagram. ![]() Both circuits have the switch in series with the motor and supplied with electrical power when the switch is closed. We can redraw this diagram in a different way, using two vertical lines to represent the input power rails and stringing the rest of the circuit between them.įigure 1b shows the result. PLC Ladder Diagrams for Electrical Engineers - Beginners (photo credit: )
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