Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 133
I/O Memory Mapping Chapter 3
The bits are defined as follows:
• SGN = Sign bit in 2’s complement format.
• NU = Not used. Bit must be set to 0.
• CHOx = Cancel High Clamp Alarm Latch for Output x: Allows each
output high-clamp-alarm latch to be individually cancelled. Cancel = 1.
• CLOx = Cancel Low Clamp Alarm Latch for Output x: Allows each
output low-clamp-alarm-latch to be individually cancelled. Cancel = 1.
Configuration Data File
The manipulation of 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 provided
by the programming software simplify configuration.
Some systems, like the 1769-ADN DeviceNet adapter system, 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, shown on the following
page.
Word
Bit Position
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
0ECNU EHIELILCERFMPMNUPFE
1 NU Format Ch0 NU Type/Range Sel Ch0
2 SGN Fault Value Channel 0
3 SGN Program (Idle) Value Channel 0
4 SGN Clamp High Data Value Channel 0
5 SGN Clamp Low Data Value Channel 0
6 SGN Ramp Rate Channel 0
7NU
8ECNU EHIELILCERFMPMNUPFE
9 NU Format Ch1 NU Type/Range Sel Ch1
10 SGN Fault Value Channel 1
11 SGN Program (Idle) Value Channel 1
12 SGN Clamp High Data Value Channel 1
13 SGN Clamp Low Data Value Channel 1
14 SGN Ramp Rate Channel 1
15 NU
16 EC NU EHI ELI LC ER FM PM NU PFE
17 NU Format Ch2 NU Type/Range Sel Ch2
18 SGN Fault Value Channel 2
19 SGN Program (Idle) Value Channel 2
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