1769-if4i output data file, 1769-if4i output data file -5 – Rockwell Automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual
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Publication 1769-UM014B-EN-P - May 2010
Module Data, Status, and Channel Configuration for the Input Module 3-5
1769-IF4I Output Data File
The output data table lets you access analog output module write data for use
in the control program, via word and bit access.
These bits are written during run mode to clear any latched low- and
high-process alarms. The alarm is unlatched when the unlatch bit is set (1) and
the alarm condition no longer exists. If the alarm condition persists, then the
unlatch bit has no effect until the alarm condition no longer exists. You need
to keep the unlatch bit set until verification from the appropriate input channel
status word that the alarm status bit has cleared (0). Then you need to reset (0)
the unlatch bit. The module will not latch an alarm condition if a transition
from no alarm to alarm occurs while a channel’s clear latch bit is set.
Table 3.2 1769-IF4I Output Data Table
Wo
rd
Bit Position
15
14
13 12 11 10 9
8
7
6
5
4
3
2
1
0
0 Nu
(1)
Nu
Nu Nu Nu Nu Nu Nu UL3
(2)
UH3
(3)
UL2 UH2 UL1 UH1 UL0 UH0
(1)
Nu = Not used. Bit must be set to 0.
(2)
ULx = Unlatch Low Process Alarm Latch x. This lets you individually cancel each low process alarm latch. Cancel = 1.
(3)
UHx = Unlatch High Process Alarm Latch x. This lets you individually cancel each high process alarm latch.