Output data – Rockwell Automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter User Manual
Page 44
Publication 1769-UM001B-EN-P - October 2002
2-20 How Communication Takes Place and I/O Image Table Mapping
Output Data
The output data file applies only to output data from the module as
shown in the table below.
IMPORTANT
Bits 0 through 6 and bit 15 of output data words 0
and 1 should always be set to zero in your control
program. If they are not set to 0, the invalid data flag
(Ex) will be set for that channel. However, the
channel will continue to operate with the previously
converted value. If a MVM (Move with Mask)
instruction is used with a mask of 7F80 (hexidecimal)
to move data to the output words, writing to bits 0
through 6 and bit 15 can be avoided.
Wo
rd
Bit Position
15
14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
0 SGN
Analog Output Data Channel 0
0
0
0
0
0
0
0
1 SGN
Analog Output Data Channel 1
0
0
0
0
0
0
0
SGN = Sign bit in two’s complement format. Always positive (equal to zero) for the 1769-IF4XOF2
module.