The two vertical lines are called rails and attach to opposite poles of a power supply usually 120 volts ac. 1a ladder diagram translates similarly to a book.
Ladder Logic
Ladder wiring diagram. The load is the last component connected to the right side of the rail unless. The power flow is taken to be from the left hand vertical across a rung. In drawing a ladder diagram certain seven conventions are adopted. A ladder or line diagram is a diagram that shows the function of an electrical circuit using electrical symbols. Usually drawn like a ladder hence the name ladder diagram. Ladder diagrams sometimes called ladder logic are a type of electrical notation and symbology frequently used to illustrate how electromechanical switches and relays are interconnected.
Therailsare the two dark vertical lines that represent the power source to the control circuit. Read the ladder diagram from left to right then up to down in order. It does not show the actual locations of the components. Ladder diagrams allow a person to understand and troubleshoot a circuit quickly. The ladder diagram shown in figure 4 is easy to read since there are only two basic parts the rails and the rungs. Convention 1 the vertical lines of the diagram represent the power rails between which circuits are connected.
The loads in a ladder diagram are always and shall be connected in parallel on the rungs. Convention 2 each rung on the ladder defines one operation in the control process. The control circuit voltage is usually rated at 12v 120v depending on the rated values of the loads connected in the circuit.
Gallery of Ladder Wiring Diagram
