Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 150)

150 Rockwell Automation Publication 1756-UM533C-EN-P - February 2011
Chapter 10 Unlatch Alarms and Reconfigure Modules By Using Ladder Logic
Unlatch Alarms in the
1756-IF8H Module The example ladder logic rungs 0…4 show how to unlatch the following alarms:
• Channel 0 High high alarm - Rung 0
• Channel 0 High alarm - Rung 1
• Channel 0 Low alarm - Rung 2
• Channel 0 Low low alarm - Rung 3
• Channel 0 Rate alarm - Rung 4
Rung 0 unlatches the high high alarm.
Rung 1 unlatches the high alarm.
Rung 2 unlatches the low alarm.
Rung 3 unlatches the low low alarm.
Rung 4 unlatches the rate alarm.
Click the box in
each rung to see
the configuration
and communication
information dialog
associated with it.
IMPORTANT An I/O module must be configured to latch alarms, before you
can perform unlatch services using ladder logic. If an unlatch
service is received by a module not configured to latch alarms,
the message instruction errors.
All alarms for channel 0 can be unlatched simultaneously with
a single message instruction by leaving the Attribute
box blank.