Appendix B: Special I/O Functions 179
Configurable Input Response Delay
The special I/O function register FTIME (R27) controls the amount of time that an input must remain
on before the input state is changed in the PLC I/O map. This amount of time is called the “Input
Response Delay”, and affects all eight inputs on the controller module (R0.0 to R0.7). This time is
user-configurable from anywhere from 0 to 64ms in length. This allows the user to avoid false input
signals due to contact bounce, input noise, or false signals of short duration. The delay is applied
equally both to the turn On, and turn Off, of the input signal, as shown in the diagram below.
Note: Any of the eight inputs that are used for either high-speed counter or pulse catch are not
affected by the Input Response Delay setting.
The Input Response Delay is automatically set for all the inputs when the new time value is loaded into
the FTIME register, R27. The ladder example below illustrates setting the Input Response Delay time
to a value of 25ms.
Input Signal
Modified Input R0.0
Input Response Dela
0 to 64ms
LET
D = R27
S = 25
Set the Input Response Delay
register (FTIME) to 25ms
F1.0
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