What is Ladder Logic & Ladder Diagram? Ladder Logic is one of the top 5 most popular types of PLC programming languages used in manufacturing environments. Before Programmable Logic Controllers, manufacturing plants employed relay-based circuitry to energize different loads based on how the relays were wired together.. Ladder logic diagrams are structured to look like an electric circuit schematic. The logic flow is from left to right and simulates the current flow in an electric circuit. The basic logic expressions can be arranged to form AND, OR and NOT logic operations by implementing normally open/closed contacts and series/parallel connections.
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Part of a ladder diagram, including contacts and coils, compares, timers and monostable multivibrators Ladder logic is widely used to program PLCs, where sequential control of a process or manufacturing operation is required.Ladder logic is useful for simple but critical control systems or for reworking old hardwired relay circuits. As programmable logic controllers became more sophisticated.. Ladder Diagram (LD) is the official name given in the international PLC programming standard IEC-61131. But, these days the terms ladder diagram, ladder logic diagram, ladder drawing, ladder control, ladder circuit, control logic diagram and logic diagram (to name a few) are all used to describe relay logic circuits and ladder logic programming.
![[DIAGRAM] Reading A Ladder Logic Diagram](http://automationprimer.com/wp-content/uploads/2013/04/Outputs.jpg "[DIAGRAM] Reading A Ladder Logic Diagram")
