# Ladder Diagram

Wednesday, January 29, 2020

*Edit***Ladder Diagram**. The ladder diagram has and continues to be the traditional way of representing electrical sequences of operations. Ladder logic was originally a written method to document the design and construction of relay racks as used in manufacturing and process control.

Ladder logic (also known as ladder diagram or LD) is a programming language used to program a Just as in electrical diagrams ladder logic have symbols for contacts and relays (which are called. In Ladder diagram, the horizontal lines called Rungs. The ladder diagram consists of two vertical lines representing the power rails.

### The ladder diagram has and continues to be the traditional way of representing electrical sequences of operations.

Ladder diagrams help you to formulate the logic expressions in graphical form that are required to program a PLC.

Each device in the relay rack would be represented by a symbol on the ladder diagram with connections between those devices shown. The figure shows the scanning motion employed by the. The ladder diagram consists of two vertical lines representing the power rails.