Rockwell Automation 57C402 25-115V AC/DC Low Power Output Module - Manual (Page 18)

5Ć2
WARNING
BE CAREFUL WHEN WRITING TO THE OUTPUTS TO INSURE THAT NO
UNEXPECTED MACHINE MOTION WILL RESULT. FAILURE TO OBSERVE THIS
PRECAUTION COULD RESULT IN BODILY INJURY OR DAMAGE TO EQUIPMENT.
Step 4. Verify that the output circuit on the module is working
correctly.
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 and the module should be replaced.
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 function in the
ReSource software.
Step 6. Verify that the hardware is working correctly.
Verify the hardware functionality by systematically
swapping out modules. After eachswap, 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.If the problem does not lie in the system, it
probably involves the remote rack.
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.