Symbol: 
Function: This command adds a boolean input “EN” (Enable) and a boolean output “ENO” (Enable Out) to the selected function block.
Call: Main menu “CFC”, context menu
Requirements: A CFC editor is active. A function block is selected.
The added input “EN” activates the function block. The function block is executed only if the input is
TRUE. The value of this signal is output at the “ENO” output.