Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 90)

6Ć6
6.9 Error Code 31 is on the Processor
Module's LED Display
Problem: Error code 31" appears on a Processor module's LED
display. This error indicates the system has a problem accessing the
module though the backplane bus. A bus error may be caused by
removal of an I/O module, an I/O module failure, a rack backplane
failure, attempting to access an invalid address, or incorrect cabling
(45C8, 45C5).
Use the following procedure to isolate a bus error:
Step 1.
Decode the errorĆspecific information listed in the
Processor Info Log. See JĆ3650 or JĆ3669 for the
procedure for decoding bus errors.
Step 2. Verify that the address being written to is a Read/Write
location. Read Only registers and bits cannot be written to
by application tasks.
Step 3. Verify that the hardware is working correctly.
Systematically replace the Remote I/O module, the
Processor module(s), and the rack/backplane assembly,
one at a time, with a corresponding module or assembly
known to be operating correctly. After replacing each
module or assembly, if the problem is not corrected,
replace the original before going on to the next item.