Electrical Ladder Diagrams. Convention 2 each rung on the ladder defines one operation in the control process. Ladder diagrams have horizontal lines of control logic called rungs and vertical lines at the start and end of each rung called rails.
Logic green output or switching command red. To understand how to read ladder wiring diagrams lets start with a simple electrical schematic consisting of a power supply switch and light then you will move on to our control panel sample wiring diagrams. Diagram below with the following input and outputs so stop xlo start 1012 1012 reset setl 10pressed stop button pbi pressed start button pb2 12 motor overload condition ol 01 start motor m only 1 state variable required for two conditions x 10 or xl output equation m 01 resetl xl 1012 xl11ñ12.
A line diagram is used to show the relationship between circuits and their components but not the actual location of the components.
The structure of a ladder diagram actually looks like a ladder hence the name ladder diagram. The rails are power be it 24 volt 120. Ladder diagrams have horizontal lines of control logic called rungs and vertical lines at the start and end of each rung called rails. The example shows how loads get used in parallel.