Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 119
I/O Memory Mapping Chapter 3
Module Default Condition
The modules default condition is all zeros, programming the conditions shown
below.
1769-OB16P
The following I/O memory mapping lets you configure the 1769-OB16P
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
(1)
configuration, if supported by the controller
• Fault mode
(1)
configuration, if supported by the controller
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
(1) Not supported by MicroLogix 1500.
Word
Bit Position
1514131211109876543210
0r
(1)
(1) r= read.
rrrrrrrrrrrrrrr
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 only 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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