Allen-Bradley 1756-IF8I User Manual page 49

Alarm Deadband
You can configure an alarm deadband to work with these alarms. The deadband
lets the process alarm status bit remain set, despite the alarm condition
disappearing, as long as the input data remains within the deadband of the
process alarm. If the Alarm Deadband is mixed with Alarm Latching, an Unlatch
command while the Alarm is within the Deadband causes the Alarm to be
cleared.
Figure 4 on page 49
point during module operation. In this example, latching is disabled; therefore,
each alarm turns Off when the condition that caused it to set ceases to exist.
Figure 4 - Alarm Deadband Alarm Settings
High high alarm turns On.
High alarm remains On.
High high
High alarm
turns On.
High
Low alarm turns On.
Low
Low low
Low low alarm turns On.
Low alarm remains On.
To see where to set the Alarm Deadband, see
Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
1756-IF8I Isolated Analog Input Module
shows the input data that sets each of the four alarms at some
High high alarm turns Off.
High alarm remains On.
High alarm turns Off.
Normal Input Range
Low alarm turns Off.
Low low alarm turns Off.
Low alarm remains On.
page
Chapter 3
Alarm Deadbands
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