Rockwell Automation 57C419 5V-24V DC Input Module - Manual (Page 26)

5Ć2
indirectly by monitoring the name with the VARIABLE
MONITOR function in the ReSource Software.
If operation is intermittent, verify that the task reading the
module is executing fast enough to catch all of the input
changes.
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 input module. Next,
replace the Processor module (s). If the problem
persists, take all of the modules except one Processor
module and the input module out of the backplane. If
the problem is now corrected, one of the other
modules in the rack is malfunctioning. Replace 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 input module being tested. Next, determine
whether the input 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, connect a dumb terminal or a
personal computer running terminal emulation
software such as Kermit to the slave remote I/O module
RSĆ232C port. Set the port parameters on the terminal
or computer to 8 bits, 1 stop bit, no parity and a baud
rate of 1200. Connect the remote I/O module (C<CR>
with Kermit). See the Remote I/O instruction manual
(JĆ3606) for how to test the module.
If you cannot determine the problem, replace the input
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 input 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 in the remote rack, try
replacing the backplane.