Output data, Input data – Rockwell Automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter User Manual
Page 37
Publication 1769-UM001B-EN-P - October 2002
How Communication Takes Place and I/O Image Table Mapping 2-13
1769-OW8 AC/DC Relay
Output Module (8 Point)
Output Data
For each 1769-OW8 module, output data word 0 contains the control
program’s directed state of the discrete output points. Bits 8 to 15 are
not used.
Input Data
For each 1769-OW8 module, input data word 0 contains the state of
the module’s output data (output data echo). During normal operation
(controller in Run), these input bits represent the logic state that the
outputs are directed to by the control program. They are also
dependent upon the:
• Program Mode configuration (Hold Last or User-Defined Safe
State)
• Fault Mode configuration (Hold Last or User-Defined Safe State)
For the 1769-OW8, input data word 0 bits 8 to 15 are not used.
Wo
rd
Bit Position
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
w
w
w
w
w
w
w
w
w = write
Wo
rd
Bit Position
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
r
r
r
r
r
r
r
r
r = read
IMPORTANT
The output module’s input data reflects the output
data echo of the module, not necessarily the
electrical state of the output terminals. It does not
reflect shorted or open outputs.