58 Rockwell Automation Publication 1769-IN088A-EN-P - February 2011
Chapter 3 I/O Memory Mapping
Output Data File
For each input module, slot x, word 0 in the output data file contains the analog
values of the outputs.
The bits are defined as follows:
• Nu = Not used. Bit set to 0.
• UHx = Cancel High Process Alarm Latch x. Allows each high process
alarm latch to be individually cancelled. Cancel = 1.
• ULx = Cancel Low Process Alarm Latch x. Allows each low process alarm
latch to be individually cancelled. Cancel = 1.
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.
Word
Bit Position
1514131211109876543210
0 Nu Nu Nu Nu Nu Nu Nu Nu UL3 UH3 UL2 UH2 UL1 UH1 UL0 UH0
Word
Bit Position
1514131211109876543210
0 Real Time Sample Value
1 ETS Reserved
2 EC Reserved EA AL EI 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 EI 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
12 S Alarm Dead Band Value Channel 1
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