299
CHAPTER 15 TROUBLESHOOTING
15
15.3 Checking for Functional Errors
15.3.11 I/O module
15.3.11 I/O module
(1) The LEDs of the output module do not turn on
When the LEDs of the output module or output side of the I/O combined module do not turn on, check the
following items.
(2) Output load does not turn on
When the output load of the output module or I/O combined module does not turn on, check the following items.
Check item Corrective action
The corresponding output is OFF when monitored with the
programming tool.
Reexamine the program.
The output number mismatches the module when checked
with System monitor of the programming tool.
Change the output number.
The LED does not turn on even though the output of another
I/O module is forcibly turned on.
The CPU module, base unit, or extension cable has a
hardware error.
Please consult your local Mitsubishi representative.
The LED does not turn on even when it is forcibly turned on
after the module is replaced with another I/O module.
The LED turns on when it is forcibly turned on after the
module is replaced with another I/O module.
The module has a hardware failure.
Please consult your local Mitsubishi representative.
Check item Corrective action
The LED corresponding to the module is not on.
Check the items described in
Page 299, Section
15.3.11 (1).
Voltage for the power supply load is not added.
Check the power supply load wiring and recover the power
supply.
Voltage among the output COM terminals is 0V. Check the load wire and load, and recover the power supply.
The inrush current has exceeded the specified value when
the maximum number of outputs turns on simultaneously.
Change the output relay number and keep the load
maximum simultaneous on current within the specified value.
The module normally operates when replaced with another
I/O module.
The module has a hardware failure.
Please consult your local Mitsubishi representative.
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