Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 153
I/O Memory Mapping Chapter 3
Output Data File
For each module, slot x, words 0…7 in the output data file contain the channel 0
through channel 7 output data. Word 8 is used to unlatch any alarm condition
that has been latched. Refer to the Compact Analog I/O User Manual,
publication number 1769-UM002
for additional details.
The bits are defined as follows:
• SGN = Sign bit in two’s complement format.
• UU = Unlatch under-range (or low-clamp exceeded) alarm.
• UO = Unlatch over-range (or high-clamp exceeded) alarm.
Configuration Data File
The manipulation of the bits from this file is normally done with programming
software, such as RSLogix 500, RSLogix 5000, or RSNetWorx for DeviceNet,
during initial configuration of the system. In that case, graphical screens are
provided by the programmer to simplify configuration. However, some systems,
like the 1769-ADN DeviceNet adapter, also allow the bits to be altered as part of
the control program, using communication rungs. In that case, it is necessary to
understand the bit arrangement. The channel configuration words, the first two
words of each eight word group, are described on page 155
. Refer to the Compact
Analog I/O User Manual, publication number 1769-UM002
for additional
details.
Word
Bit Position
15 14131211109876543210
0 SGN Analog Output Data Channel 0
1 SGN Analog Output Data Channel 1
2 SGN Analog Output Data Channel 2
3 SGN Analog Output Data Channel 3
4 SGN Analog Output Data Channel 4
5 SGN Analog Output Data Channel 5
6 SGN Analog Output Data Channel 6
7 SGN Analog Output Data Channel 7
8 UU7 UO
7
UU
6
UO
6
UU
5
UO
5
UU
4
UO
4
UU
3
UO
3
UU
2
UO
2
UU
1
UO
1
UU
0
UO
0
Word Description Word Description
0 Channel 0 Configuration Word 0 24 Channel 3 Configuration Word 0
1 Channel 0 Configuration Word 1 25 Channel 3 Configuration Word 1
2 Channel 0 Fault Value Word 26 Channel 3 Fault Value Word
3 Channel 0 Program Idle Mode Word 27 Channel 3 Program Idle Mode Word
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