Process alarms – Rockwell Automation 1756-IF4FXOF2F ControlLogix High-speed Analog I/O Module User Manual
Page 44
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Rockwell Automation Publication 1756-UM005B-EN-P - January 2013
Chapter 3
Module Features
Process Alarms
Process alarms (configured in engineering units) alert you when the module has
exceeded configured high or low limits for each input channel. You can latch
process alarms. These are set at four user configurable alarm trigger points:
•
High high
•
High
•
Low
•
Low low
You can configure an alarm deadband to work with these alarms. The deadband
lets the process alarm status bit to remain set, despite the alarm condition
disappearing, as long as the input data remains within the deadband of the
process alarm.
Figure 8
shows input data that sets each of the four alarms at some point during
module operation. In this example, Latching is disabled; therefore, each alarms
turns OFF when the condition that caused it to set ceases to exist.
Figure 8 - Process Alarms
To see how to set process alarms, see
. To see how to set the alarm
deadband, see
.
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High High
Low Low
Low
High
Alarm Deadbands
High high alarm turns OFF.
High alarm remains ON.
High high alarm turns ON.
High alarm remains ON.
Normal input range
Low low alarms turns OFF.
Low alarm remains ON.
High alarm turns OFF.
Low low alarms turns ON.
Low alarm remains ON.
Low alarms turns OFF.
Low alarms turns ON.
High alarm
turns ON.