Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 21)

1Ć5
1.4 Negative Transition Contact (NTI)
Use this input instruction to examine a Boolean variable for a falling edge. When this
variable changes from being on to off, the NTI instruction becomes true for one scan;
otherwise, the instruction is false.
The supported variables are:
D simple Boolean
D Boolean array element
D timer/counter status bits
Do not use these variables:
D bitĆindexed integer or double integer variables
D bitĆindexed integer or double integer array elements
Example of a Negative Transition Contact (NTI)
This rung shows that when switch1 transitions
from on to off the variable valve.closed is set
true for one scan.