66 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 3 Common Module Features
The following illustration offers an overview of the fault reporting process on
ControlLogix digital output modules.
Module-fault Word
All modules
Fuse Blown Word
Point Level Group Level
1756-OA8D 1756-OA16
1756-OA8E 1756-OB16E
1756-OB8EI 1756-OV16E
1756-OB16D 1756-OV32E
1756-OB16IEF
Field Power Loss Word
1756-OA8E only
41457
Bit 31 Bit 0
A blown fuse for any point or group sets the bit for that point or group 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 or
field power loss condition sets the appropriate bits in the module-fault 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.
Group 0
Group 0
Group 1
1
1
Group 1
1
1
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