Optex SC-U1, Operation Manual

Page: 41 / 92

41
Relay Setting
If you selected an item for alarm output, set the following items additionally.
4
Item Description Refer to
Trigger For alarm output, set High Alarm (upper limit trigger) or
Low Alarm (lower limit trigger).
• High Alarm (upper limit trigger)
Alarm condition is met when a measurement value
exceeds the active level
• Low Alarm (lower limit trigger)
Alarm condition is met when a measurement value falls
under the active level
P.42
Active Level A measurement value can be set to activate On delay. P.42
Hysteresis The hysteresis can be set to cancel the alarm output. P.43
On Delay Specify a time period to output alarm after a measurement
value exceeds the active level. P.44
Off Delay Specify a time period to cancel alarm output after a
measurement value falls under (or exceeds) the alarm
hysteresis. P.45
Example of operation when High Alarm (upper limit trigger) is set
On delay
As the time period when
measurement values are
higher than the active level is
shorter than the On delay,
alarm output is not activated. As the time period when
measurement values are
higher than the active level
exceeds the On delay,
alarm output is activated. As the time period when
measurement values are lower
than the alarm hysteresis
exceeds the Off delay, alarm
output is canceled.
Active level
(Active level) -
(Hysteresis)
Low
High
Measurement
value
On delay
Alarm output
Off delay
Alarm
output
ON
OFF
Alarm is
canceled. Alarm is
output.