Rockwell Automation 1769-OF4 Compact I/O Analog Output Module - 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