The FBD editor enables the drawing of LD rungs. A particular object, the "OR" rail can be inserted on a rung in order to connect parallel contacts together. Press the following button in the FBD toolbar for inserting a new "OR" rail:

 

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Insert OR rail: In this mode, the mouse is used for inserting a rail that collects several Boolean data flows for an OR operation, in order to insert parallel contacts such as done in Ladder Diagrams.

 

The OR rail has exactly the same meaning as an OR block regarding the execution of the diagram.

FBD "OR" vertical rail

IEC 61131-3 Automation platform > IEC 61131-3 Programming Environment > Editing programs > Function Block Diagram (FDB) Editor > Using the FBD toolbar > FBD "OR" vertical rail

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