
11. TROUBLESHOOTING
11 - 8
MELSEC-A
11.2.7
Flowchart used when the output load of the output module does not come ON
NO
YES
NO
YES
NO
YES
0 V
Specified
voltage
NG
OK
0 V
(monitor signal
OFF)
Specified
voltage
Output load does not
come ON.
Is the indicator
LED of the output mod-
ule ON?
Is the voltage
of the power supply for
the load applied?
Is voltage
across the output
module's output COM
terminals as
specified?
Failure of output module.
Replace output module.
Check rush current when
the output load reaches
the maximum number of
simultaneous ON signals.
Check the output state in
monitor mode with the pro-
grammer.
Check the Input signal in
monitor mode with the pro-
grammer.
Check the wiring load of
the power supply for the
load and restore the
power.
Check the load wiring and
load and restore the
power.
Change the output relay
number to adjust the rush
current to comply with
specifications.
Is the indicator
LED of the input mod-
ule ON?
Measure the voltage be-
tween the module input
and COM terminal.
Check external wiring
and external input
equipment.
Consult your nearest
Mitsubishi representative.
POINT
If the input or load signals are not switched OFF, see Section 11.4 I/O
Connection Troubleshooting and take corrective measures.
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