Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 29
Chapter 2
Ladder Diagram (LD) language
Ladder diagram language reference.
Element Description
LD program on page 29 Graphical representation of Boolean equations which combines contacts (input arguments) with coils (output results) using
graphic symbols.
LD program development
environment on page 30
Example showing the language editor for an Ladder Diagram (LD) program.
Ladder Diagram (LD)
elements on page 31
Components used to build a Ladder Diagram program.
Instruction blocks in LD
programs on page 49
IEC 61131-3 compliant instruction blocks collectively include function blocks, functions and operators.
Working in the LD language
editor on page 50
Adding elements to a LD program.
Ladder Diagram (LD)
program examples on page
52
Examples of Ladder Diagram (LD) programs.
LD Keyboard shortcuts on
page 54
Keyboard shortcuts available for the Ladder Diagram (LD) language.
A Ladder Diagram (LD) is a graphical representation of Boolean equations that
combines contacts (input arguments) with coils (output results). Using graphic
symbols in a program chart (organized like a relay ladder wiring diagram), the LD
language describes 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.
Connected Components Workbench™ support for Ladder Diagram (LD)
Connected Components Workbench™ provides an LD language editor and
supports the elements and instructions that are supplied with the Connected
Components Workbench software only.
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