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5Ć8
swapping out modules, determine whether the module
being tested is the only module that is not working
correctly. If morethan onemoduleis not working correctly,
the problem most likely lies in the remote I/O system.
Refer to the instruction manual for the M/N 57C416
RemoteI/O Communications modulefor moreinformation.
If theproblem does not liein theremoteI/O system, it
probably involves the remote rack.
To test the remote rack, systematically swap out the
module being tested and the slave Remote I/O module. If
the problem persists, take all of the modules except the
slaveRemoteI/O moduleand themodulebeing tested out
of the rack. If the problem is now corrected, one of the
other modules in the rack is malfunctioning. ReĆconnect
theother modules oneat a timeuntil theproblem
reappears. If the problem appears to be neither in the
remote I/O system nor in the remote rack replace the
backplane.
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