What is PLC ladder diagram?
Answers
Ladder diagram, better known as ladder logic
Answer:
Ladder Diagram (LD) Programming
The most common language used to program PLCs is Ladder Diagram (LD), also known as Relay Ladder Logic (RLL).
This is a graphical language showing the logical relationships between inputs and outputs as though they were contacts and coils in a hard-wired electromechanical relay circuit.
This language was invented for the express purpose of making PLC programming feel “natural” to electricians familiar with relay-based logic and control circuits. While Ladder Diagram programming has many shortcomings, it remains extremely popular in industries automation.
Every Ladder Diagram program is arranged to resemble an electrical diagram, making this a graphical (rather than text-based) programming language.
Ladder diagrams are to be thought of as virtual circuits, where virtual “power” flows through virtual “contacts” (when closed) to energize virtual “relay coils” to perform logical functions.
None of the contacts or coils seen in a Ladder Diagram PLC program are real; rather, they act on bits in the PLC’s memory, the logical interrelationships between those bits expressed in the form of a diagram resembling a circuit. being edited on a personal computer.
Explanation:
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