Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 63)

Publication 1756-UM009C-EN-P - December 2010 63
Non-isolated Analog Voltage/Current Input Modules (1756-IF16, 1756-IF8) Chapter 4
Process Alarms
Process alarms alert you when the module has exceeded configured high or
low limits for each channel. You can latch process alarms. These are set at
four user configurable alarm trigger points.
• High high
• High
• Low
• Low low
Alarm Deadband
You may configure an alarm deadband to work with the process alarms. The
deadband allows 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.
The illustration on the next page 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.
To see how to set Process Alarms, see page 212 .
IMPORTANT
Process alarms are not available in integer mode or in
applications using 1756-IF16 module in the single-ended,
floating point mode. The values for each limit are entered
in scaled engineering units.
43153
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