Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 167
I/O Memory Mapping Chapter 3
Fault State Word
Word 3, the fault state word, selects the hold last state or user-defined safe state
condition on a system transition from Run to Fault.
Fault Value Word
The fault value word, word 4, is used to program the fault state value (0=Off,
1=On). Each output is individually configurable for on or off.
1769-OV32T
The following I/O memory mapping lets you configure the 1769-OV32T
module.
Output Module’s Input Data File
For each module, slot x, input data file words 0 and 1 contain the state of the
module’s output data (output data echo) file words 0 and 1. 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
Condition Bit Setting
User-defined Safe State 0
Hold Last State 1
Value Bit Setting
Off 0
On 1
Word
Bit Position
1514131211109876543210
0r
(1)
(1) r = read.
rrrrrrrrrrrrrrr
1rrrrrrrrrrrrrrrr
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.
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