Omron NX-IA3117, User Manual

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6 Digital Input Units
6 - 14 NX-series Digital I/O Unit User’s Manual (W521)
This function prevents data changes and unstable data caused by changes of input data and unstable
status of input bits due to chattering and noise.
You can also use this function to make the settings to easily read the pulses that ON time is short.
 If Input Filter Mode Setting is Enable ON Filter and OFF Filter
Read the inputs at a 1/4 interval of the input filter time. When all inputs are ON or OFF, the input val-
ues turn ON or OFF.
This prevents data changes and unstable data.
This function works for all inputs of the NX Units at the same time.
Operation when the input turns from OFF to ON (ON filter)
6-4-2 Input Filter
Purpose
Details on the Function
Input filter time
Input value is OFF
because all inputs
are not ON during
four times of reading.
Input filter time
Values of input
terminals
Input value
1 2 3 4
ON OFF OFF ON
1 2 3 4
ON ON ON ON
OFF
ON
OFF
ON
Input value is ON
because all inputs
are ON during
four times of reading.