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
Wo
rd
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
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
Wo
rd
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Real Time Sample Value
1
ETS
Reserved
2
EC
Reserved
EA
AL
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
8
EC
Reserved
EA
AL
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
Summary of Contents for Allen-Bradley 1769-IF4
Page 1: ...CompactI OAnalog Modules 1769 IF4 IF8 OF2 OF8C and OF8V User Manual ...
Page 4: ...Publication 1769 UM002B EN P July 2005 Summary of Changes 2 Notes ...
Page 10: ...Publication 1769 UM002B EN P July 2005 Table of Contents vi ...
Page 14: ...Publication 1769 UM002B EN P July 2005 4 Notes ...
Page 183: ......
