6 - 15
6 Digital Input Units
NX-series Digital I/O Unit User’s Manual (W521)
6-4 Function
6
6-4-2 Input Filter
Operation when the input turns from ON to OFF (OFF filter)
If Input Filter Mode Setting is Enable Only OFF Filter
ON filter is disabled and OFF filter is enabled.
This makes easily to read the pulses that ON time is short.
1234
OFF ON OFF OFF
1234
OFF OFF OFF OFF
OFF
ON
OFF
ON
Input filter time
Input value is ON
because all inputs
are not OFF during
four times of reading.
Input filter time
Values of input
terminals
Input value
Input value is OFF
because all inputs
are OFF during
four times of reading.
Input filter time
1234
ON OFF OFF OFF
OFF
ON
OFF
ON
Input filter time
1234
ON
ON OFF OFF
OFF
ON
OFF
ON
OFFOFF
OFF
OFF
When input is ON (ON filter disabled)
If the status of input terminals turns ON,
the input value will turn ON immediately.
When input is OFF (OFF filter enabled)
When input is ON (ON filter disabled)
If the status of input terminals turns ON,
the input value will turn ON immediately.
When input is OFF (OFF filter enabled)
Values of input
terminals
Input value
If the status of input terminals does not
turn ON again during the input filter
time, the input value will turn OFF after
the input filter time has passed.
If the status of input terminals turns ON
again during the input filter time, the
input value stays ON from that time
during the input filter time.