The Schematic Diagram Resembles A Ladder In That It Is Made Up Of Two Vertical Lines. The ladder diagram shown in figure 4 is easy to read since there are only two basic parts the rails and the rungs. The schematic ladder diagram resembles a ladder in that it is made up of two vertical lines representing the incoming electrical sources.
Circuits are connected as horizontal lines i e the rungs of the ladder between these two verticals. A very commonly used method of programming plcs is based on the use of ladder diagrams. Writing a program is then equivalent to drawing a switching circuit.
9 3 illustrates a typical ladder diagram and its conventions.
A graphical representation of the programming elements. 9 3 illustrates a typical ladder diagram and its conventions. It resemble a ladder which is why it is named ladder diagram. The control circuit voltage is usually rated at 12v 120v depending on the rated values of the loads connected in the circuit.
