This element allows you to use Ladder events to page back through Keypad Entry Variables. Previous Var pages back according to the physical order of the variables on the LCD screen.
In the following figure, if Var 4 is the active variable, pressing F1 once activates Var 3, an additional press activates Var 2, then 1. If Var 1 is active, pressing F1 activates Var 4.