Ladder diagram language

A ladder diagram (LD) is a graphical representation of Boolean equations that combines contacts (input arguments) with coils (output results).

The LD language uses graphic symbols in a program chart that is organized like a relay ladder wiring diagram to describe the tests and modifications of Boolean data.

LD graphic symbols are organized within the chart as an electrical contact diagram. The term "ladder" comes from the concept of rungs connected to vertical power rails at both ends, where each rung represents an individual circuit.

FactoryTalk Design Workbench

includes an LD language editor and supports specific elements and instructions that are provided exclusively by the

FactoryTalk Design Workbench

software.