Command: Insert Input
Shortcut: Ctrl + Shift + I
Symbol: 
Function: The command inserts an input at the selected position. When you drag the element from the toolbox to the implementation part, the plus symbol at the cursor (
) helps you recognize the possible insertion positions. You can replace the initially displayed question marks (???) with a variable name or a constant.
Call: Ladder menu; context menu
Element: Input
The element is used to assign a variable value to another element in the signal flow. It has a continuous line to the right.