Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 113
I/O Memory Mapping Chapter 3
Program to Fault Enable Bit (PFE)
Word 0, bit 0, allows the selection of which data value, the program or fault value,
to apply to the output if a system in Program mode undergoes a system fault,
resulting in a change to the Fault mode.
Module Default Condition
The modules default condition is all zeros, programming the conditions shown
below.
1769-OB8, Series A
The following I/O memory mapping lets you configure the 1769-OB8, Series A
module.
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 these configurations:
• Program mode configuration, if supported by the controller
• Fault mode configuration, if supported by the controller
Value Applied Bit Setting
Program 0
Fault 1
Word or Bit Affected Condition Applied
Word 0, Bit 0: Program-to-Fault Enable Program Value
Word 1: Program State User-defined Safe State
Word 2: Program Value Off
Word 3: Fault State User-defined Safe State
Word 4: Fault Value Off
Word
Bit Position
1514131211109876543210
0
0 0 0 0 0 0 0 0r
(1)
(1) r = read.
rrrrrrr
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