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Digital output value varies
Check item
Check whether a conversion method other than sampling processing is set.
Conversion completed flag does not turn on
Check item
Check whether all channels are set to be conversion disabled.
When the input type is "resistance temperature detector", and
"thermocouple"
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
When the ERROR LED turns on or flashes
■When it is on
Check item
Check whether any error has occurred.
■When flashing
Check item
Check whether 24 V DC external supply power shutdown has occurred.
9 TROUBLESHOOTING
98
9.2 Troubleshooting by Symptom
Corrective action
Check the setting of average processing specification from the "Module
parameter setting" screen of GX Works3.
Review the setting of average processing specification and check the state of
variation of 'CH1 Digital output value' (Un\G400) again.
Corrective action
Check the setting of input type with GX Works3.
If there is no channel other than conversion disabled, please set the input type
setting to one other than "Conversion disabled" for one or more channels from
GX Works3 or sequence program.
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
Check 'Latest error code' (Un\G0) and take actions described in the list of
error codes.
Page 100 List of Error Codes
Corrective action
Check that FX5-8AD and 24 V DC external power supply are properly
connected.
Additionally, before turning on the system power supply, check that the voltage
supply from the 24 V DC external power supply is started to FX5-8AD.
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.
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