Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 29)

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1.7 Always False Contact (AFI)
Use this input instruction whenever you need a contact that will always evaluate false.
For example, use it when you are debugging a program and wish to disable some
logic, but you do not want to delete the original logic.
Using a variable name is optional. However, if one is used, the variable must be a
simple Boolean.
Example of an Always False Contact (AFI)
This rung is placed in a false state by the AFI
instruction.