Coils

Coils are graphic components of Ladder Diagram (LD) programs used in Function Block Diagram (FBD) programs representing the assignment of Boolean outputs. A coil represents an action. It must be connected on the left to a Boolean symbol, like a contact or the Boolean output of a block.

Types of coils available from the FBD toolbox are:

Direct Coil

Reverse Coil

Set Coil

Reset Coil

Change the type of a coil at anytime after insertion.

When inserting coils in program organization units (POUs), assign variables using the Variable Selector
. Names of assigned variables display above the coil 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'.

Select a variable from the drop-down combo box:

Type a literal value in the text box:

Task	Procedure
Insert an FBD coil	From the Toolbox , drag the desired coil type into the language container and place it on the rung. The Variable Selector is displayed. In the Variable Selector , select the required variable, then click OK . The coil element and its associated variable name are displayed in the language container.
Insert a parallel FBD coil	From the Toolbox , drag the coil element into the language container while placing it parallel to the existing coil. Drag the left and right connections to the respective connection points on the rung. The required coil is displayed on the parallel branch.
Change the type of a coil in FBD	In the language container, select the coil, and then select the required type in the Modifier property of the Properties window.

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