Troubleshooting; Troubleshooting With The Leds; Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

3.10

Troubleshooting

This section describes errors that may occur in the use of a multiple input module and those troubleshooting.

Troubleshooting with the LEDs

Check the state of the LEDs to narrow down the possible causes of the trouble. This step is the first diagnostics before using
GX Works3.
A state of a multiple input module can be checked with the RUN LED, ERROR LED, and ALM LED. The following table shows
the relation of these LEDs and a state of a multiple input module.
Name Description
RUN LED Indicates the operating status of the module.
On: Normal operation
Flashing: Offset/gain setting mode
Off: Error
ERROR LED Indicates the error status of the module.
On: Minor error or major error
Flashing: Moderate error or major error
Off: Normal operation
ALM LED Indicates the alarm status of the module.
On: Process alarm or rate alarm issued
Flashing: Input signal error or disconnection detection detected
Off: Normal operation
*1 For details, refer to the following.
Page 414 List of error codes
*2 For details, refer to the following.
Page 417 List of alarm codes

Troubleshooting by symptom

When the input type is "current", and "voltage"
■When the RUN LED flashes or turns off
• When flashing
Check item
Check whether the module is in offset/gain setting
mode.
• When it is off
Check item
Check whether the power is supplied.
Check whether the capacity of the CPU module is enough.
Check whether the module is mounted properly.
Cases other than the above
3 FX5-8AD
410
3.10 Troubleshooting
*1
*2
Cause
The programmable controller has been powered
offon, or the CPU module has been reset when
the operation mode is set to offset/gain setting
mode in the module parameter setting of GX
Works3.
The value in the mode switching setting has been
changed and the mode has been switched to
offset/gain setting mode.
Corrective action
Check that the supply voltage of the multiple input module is within the rated
range.
Calculate the current consumption of the I/O modules, and intelligent function
modules to check that the power capacity is enough.
Check the mounting state of the module.
Reset the CPU module, and check if the RUN LED turns on. If the RUN LED
still remains off, the possible cause is a failure of the module. Please consult
your local Mitsubishi representative.
Corrective action
In the module parameter setting of GX Works3, set
the operation mode to normal mode and power
offon the programmable controller, or reset the
CPU module.
Review the program that uses the mode switching
setting to check whether the mode has been
switched erroneously.