I/o memory mapping, Output data file, Output module’s input data file – Rockwell Automation 1769-OB16 Compact Solid State 24V dc Source Output Module User Manual
Page 11
Compact™ Solid State 24V dc Source Output Module 11
Publication 1769-IN054A-EN-P - April 2001
I/O Memory Mapping
Output Data File
For each module, slot x, word 0 in the output data file contains the control
program’s directed state of the discrete output points.
w = write
Output Module’s Input Data File
For each module, slot x, input data file word 0 contains the state of the module’s
output data (output data echo) file word 0. During normal operation, 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 (if supported by the controller)
•
The Fault Mode configuration (if supported by the controller)
r = read
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
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
IMPORTANT
The output module’s input data file 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.
It is important to use this input word if the controller adapter
supports the Program Mode or Fault Mode function, and if it is
configured to use them.