Rockwell Automation 1769-OF4 Compact I/O Analog Output Module User Manual
Page 15
Compact I/O Analog Output Module 15
Publication 1769-IN087A-EN-P - August 2009
Input Data File
For each module, slot x, word 0 in the input data file contains the status bits for the
module’s analog output channels. Words 1…4 contain the directed values of the
analog output channels (output data echo).
The bits are defined as follows:
•
SGN = Sign bit in 2’s complement format.
•
NU = Not Used. Bit must be set to 0.
•
Sx = General Status bit for output channels 0…3.
•
Ox = Over range flag bits for output channels 0…3.
•
Ux = Under range flag bits for output channels 0…3.
Configuration Data File
The manipulation of bits from this file is normally done with programming software
(for example, RSLogix 500 software or RSNetWorx for DeviceNet software) 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 15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Word 0
U3
O3
U2
O2
U1
O1
U0
O0
NU NU NU NU S3
S2
S1
S0
Word 1
SGN
Output Data Loopback/Echo Channel 0
Word 2
SGN
Output Data Loopback/Echo Channel 1
Word 3
SGN
Output Data Loopback/Echo Channel 2
Word 4
SGN
Output Data Loopback/Echo Channel 3