Allen-Bradley 1756-IA32 - Rockwell Automation Publication 1756-UM058 G-EN-P - November

82 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 4 Diagnostic Module Features
The following illustration provides an overview of the fault reporting process for
digital output modules.
Module-fault Word
Fuse Blown Word
Field-power Loss Word
1756-OA8D only
Bit 31 Bit 0
A no load condition for any point sets the bit for that point in the no
load word and also sets the appropriate bit in the module-fault word.
A blown fuse for any point sets the bit for that point in the fuse blown word and
also sets the appropriate bits in the module-fault word.
A communications fault sets all bits in the module-fault word. A fuse blown,
field-power loss, no load or output verify condition sets the appropriate bit in
the module-fault word.
No Load Word
Output Verify Word
A loss of field power from any group sets the bit for that point in the field-power
loss word and also sets the appropriate bits in the module-fault word.
An output verify condition for any point sets the bit for that point in the output
verify word and also sets the appropriate bit in the module-fault word.
1
Group 0
1
1
1
1
1
Group 1
1
1
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