Rockwell Automation 57C403 115VAC High Power Output Module - Manual (Page 18)

5Ć2
Connect a voltmeter to the proper points on the terminal
strip and continue to toggle the output device from the I/O
MONITOR. The voltmeter should alternate between 0 and
the line voltage. If this does not happen, the output circuit
is malfunctioning.
Step 5. Verify that the user application program is correct.
Verify that the application program that references the
symbolic names associated with the module has declared
those names COMMON.
Verify that the symbolic name in question is being
referenced in the application program. This can be done
indirectly with the VARIABLE MONITOR in the
programmer.
Step 6. Verify that the hardware is working correctly.
Verify the hardware functionality by systematically
swapping out modules. After each swap, if the problem is
not corrected, replace the original module before
swapping out the next module.
D To test local I/O, first replace the output module. Next,
replace the processor module(s). If the problem
persists, take all of the modules out of the backplane
except one processor module and the output module.
If the problem is now corrected, one of the other
modules in the rack is malfunctioning. Reconnect the
other modules one at a time until the problem
reappears. If none of these tests reveals the problem,
replace the backplane.
D To test remote I/O, first verify that the remote I/O system
is communicating with the drop that contains the
output module being tested. Next, by systematically
swapping out modules, determine whether the output
module is the only module that is not working. If more
than one module is not working correctly, the problem
most likely lies in the remote I/O system.
D To test the remote rack, first replace the output
module. Next, replace the slave remote I/O module. If
the problem persists, take all of the modules out of the
remote backplane except the slave remote I/O module
and the output module. If the problem is now
corrected, one of the other modules in the rack is
malfunctioning. Reconnect the other modules one at a
time until the problem reappears. If the problem proves
to be neither in the remote I/O system nor the remote
rack, try replacing the remote backplane.
5.2 Bus Error
Problem: A 31" or 51" through 58" appears on the processor
module's LED. This error message indicates that there was a bus
error when the system attempted to access the module. The possible
causes of this error are a missing module, a module in the wrong
slot, or a malfunctioning module. It is also possible that the user has
attempted to write to the wrong registers on the module. Refer to the
AutoMax Procesor Module Instruction Manual (JĆ3650) for more
information. Use the following procedure to isolate a bus error: