108 Rockwell Automation Publication 1769-IN088A-EN-P - February 2011
Chapter 3 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. For the 1769-OA8, bits
8…15 are not used.
Configuration File
The read/writable configuration data file allows the setup of the hold last state
and user-defined safe state conditions.
The manipulation of the bits from this file is normally done with programming
software, such as RSLogix 500, RSLogix 5000, or RSNetWorx for DeviceNet,
during initial configuration of the system. In that case, graphical screens are
provided via the programmer to simplify configuration. However, some systems,
like the 1769-ADN DeviceNet adapter, 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 arrangment.
Program State Word
Word 1, the program state word, selects the hold last state or user-defined safe
state condition for each individual output on a system transition from Run to
Program.
Word
Bit Position
1514131211109876543210
0
0 0 0 0 0 0 0 0w
(1)
(1) w = write.
wwwwwww
Word
Bit Position
1514131211109876543210
0000000000000000PFE
1 Program State for Output Array Word 0
2 Program Value for Output Array Word 0
3 Fault State for Output Array Word 0
4 Fault Value for Output Array Word 0
Condition Bit Setting
User-defined Safe State 0
Hold Last State 1
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