Simple Ladder Diagram. Circuits are connected as horizontal lines ie the rungs of the ladder between these two verticals. Assuming that there is a cylinder a sensor is attached to itThe cylinder has a reed switch for detecting the forward end and the backward end.
Anatomy of Ladder Diagram Input instructions are entered on the left Output instructions are entered on the right The power rails simulate the power supply lines L1 and L2 for AC circuits and 24V and ground for DC circuits Most PLCs allow more than one output per rung The processor or controller scans ladder. A ladder diagram is used to point out relationships between circuit components not the actual location of the components. The ladder diagram consists of two vertical lines representing the power rails.
The two vertical lines are called rails and attach to opposite poles of a power supply usually 120 volts AC.
And there is a push button switchActivate this cylinder and check if there is an object first. The below figure illustrates an example of a simple ladder program with the NO and NC contacts driving an output rung. A filling a tank to a predetermined level b agitating the liquid for 30 minutes c draining the tank for use in another part of process Does the ladder logic schematic that follows perform. Look at the ladder logic diagram how simple it is.
