Coils

Coils are graphic components of Ladder Diagram (LD) programs that can be 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, such as a contact or the Boolean output of a block.
These types of coils are available from the FBD stencil:
  • Direct Coil
  • Reverse Coil
  • Set Coil
  • Reset Coil
Change the type of a coil at any time after insertion.
When inserting coils in program organization units (POUs), assign variables using the
Variable Selector
. Names of assigned variables are displayed 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 that begin 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 a coil
  1. From the
    Toolbox
    , drag the desired coil type into the language container and place it on the rung.
  2. 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.
  3. (optional) To change the type of a coil, select the coil, and then select the required type in the
    Modifier
     property of the
    Properties
     window.
Insert a parallel coil
  1. From the
    Toolbox
    , drag a contact element into the language container while placing it parallel to the existing contact.
  2. In the
    Variable Selector
    , select the required variable, then click
    OK
    .
  3. Drag the left and right connections to the respective connection points on the rung.
    The contact and its associated variable name are displayed on the branch.
Change the type of a coil
  • In the language container, select the coil, then select the required type in the
    Modify
     property of the
    Properties
     window.
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