Controller, IONet switch, or I/O pack
power LED is not lit .
Is there voltage
at the cable
feeding power to
the I/ O pack,
Ethernet switch,
or controller?
Yes
Replace the
pack, Ethernet
switch, or
controller.
Trace the cable
back to the
distribution board
(for example JPDL,
JPDC, JPDH for
packs, also JPDP
for switches).
No
Is there power at
the board
connector to the
cable?
Yes
No
Is the power
distribution board
fed incoming power
from another power
distribution board?
Yes
Replace the cable
between power
distribution board
and I/O pack,
Ethernet switch, or
controller.
Yes
No
Is there
power at the
prior
distribution
board output
connector?
Are there
any blown
fuses?
Replace the
fuse.
Yes
No
Does the
distribution
board have
any switches
in the OFF
position?
Turn switch
to ON.
Yes
No
Is there
incoming
power at the
input cable?
Yes
No
Is the power
distribution
board fed
incoming power
from a power
supply?
No
Is there input
power from the
cable leading
to prior
distribution
board?
Yes
Replace the power distribution
board that is directly connected
to the I /O pack, Ethernet switch,
or controller.
No
No
Replace the
board
Is there power
at the output
connector on
the power
supply?
Replace the
cable
Is there power
at the input to
the power
supply?
Yes
Yes
Replace the
power supply
Yes
No
Continue to trace power back
to cabinet power entry (check
circuit breakers, disconnects,
contactors, and so forth).
Replace the power
cable that connects
between both
power distribution
boards .
Troubleshooting Power Loss to Controllers, I/O Packs, or IONet Switches
176
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