Chapter 3 Ladder Diagram (LD) elements
50 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Instruction block names
Functions and function blocks are represented by a box that displays the name of
the instruction, and the short version of the parameter names. For function blocks,
the instance name is displayed in italics.
Instruction block return parameters
• The return parameter of a function has the same name as the function. The
return parameter is the only output.
• The return parameters of a function block can have any name. Multiple
return parameters can provide multiple outputs.
• You can define the parameters of programs for multiple devices by
navigating the tabs for individual devices displayed in the Parameter view.
How elements are added to a ladder diagram
When you add items to a rung in the LD program, they are added according to the
following criteria.
• The first element on a rung is inserted at the position you select in the
ladder diagram.
• Subsequent elements are inserted to the right of the selected item on the
rung.
• If the element is too large for the current rung, the element is placed on the
next rung.
Working in the LD language
editor
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