Output data, Input data – Rockwell Automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter User Manual
Page 34
Publication 1769-UM001B-EN-P - October 2002
2-10 How Communication Takes Place and I/O Image Table Mapping
1769-OB16P Electronically
Protected Solid-State 24V
DC Output Module
Output Data
For each 1769-OB16P module, output data word 0 contains the
control program’s directed state of the discrete output points.
Input Data
For each 1769-OB16P module, input data word 0 contains the state of
the module’s output data (output data echo) word 0. 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 (Hold Last or User-Defined Safe State)
configuration
• Fault Mode (Hold Last or User-Defined Safe State) configuration
Wo
rd
Bit Position
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
0
w
w
w
w
w
w
w
w
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
r
r
r
r
r
r
r
r
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.