Ladder Diagrams are graphical programs that are similar to 'relay ladder' programs. Traditionally, 'relay ladder' programs have been used to program PLCs and similar devices. They are ideally suited to programs that provide complicated AND and OR logic.
If you are familiar with 'relay ladder' programs, you will soon become accustomed to working with Ladder Diagrams as they use similar symbols and features.
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For information on the properties of the Ladder Diagram database item, see Logic Program Properties and Values.