Publication 1769-UM002B-EN-P - July 2005
3-20 Module Data, Status, and Channel Configuration for the Input Modules
1769-IF8 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. The data table structure is
shown in the table below.
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.
1769-IF8 Configuration Data
File
The configuration file lets you determine how each individual input channel
will operate. Parameters such as the input type and data format are set up using
this file. This data file is writable and readable. The default value of the
configuration data table is all zeros. The structure of the channel configuration
file is shown below.
Table 3.12 1769-IF8 Output Data Table
Word
Bit Position
15 14131211109876543210
0
CL
(1)
L7
(1)
CL Lx = Cancel Low Process Alarm Latch x. This lets you individually cancel each low process alarm latch.
Cancel = 1.
CL
(2)
H7
(2)
CL Hx = Cancel High Process Alarm Latch x. This lets you individually cancel each high process alarm latch.
CL
L6
CL
H6
CL
L5
CL
H5
CL
L4
CL
H4
CL
L3
CL
H3
CL
L2
CL
H2
CL
L1
CL
H1
CL
L0
CL
H0
Table 3.13 1769-IF8 Configuration Data Table
Word
Bit Position
15 14 13 1211109 8 76543210
0 Real Time Sample Value
1 ETS Reserved
2EC ReservedEAAL
EI
(1)
Reserved Input Filter Sel Chl0
3 Reserved Inpt Dta Fm Chl0 Reserved Inpt Tp/RngeSel Chl0
4 S Process Alarm High Data Value Channel 0
5 S Process Alarm Low Data Value Channel 0
6 S Alarm Dead Band Value Channel 0
7 Reserved
8EC ReservedEAAL
EI
(1)
Reserved Inpt Filter Sel Chl1
9 Reserved Inpt Dta Fm Chl1 Reserved Inpt Tp/RngeSel Chl1
10 S Process Alarm High Data Value Channel 1
11 S Process Alarm Low Data Value Channel 1
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