Contacts

Contacts are graphic components of Ladder Diagram (LD) diagrams that can be used in Functional Block Diagram (FBD) programs. Depending on the type of contact, it represents the value or function of an input or internal variable.

These contact types are available from the FBD stencil:

Change the type of a contact at any time after insertion.

When inserting contacts in program organization units (POUs), assign variables using the

Variable Selector

. Names of assigned variables are displayed above the contact elements within POUs. Replace existing variables by double-clicking the variable names to access the

Variable Selector

or by single-clicking variable names to select from drop-down combo boxes containing the global and local variables. Also, single-click existing variables, then type literal values in the text boxes provided. When inserting literal values beginning with a letter or an underscore, enclose the variable name in single quotes as follows: 'abc'.