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3 TROUBLESHOOTING
3.3 Troubleshooting by Symptom
3.3 Troubleshooting by Symptom
When the A/D converter module does not start up
When the RUN LED flashes or turns off
When flashing
When turning off
When the ERR LED turns on
When turning on
Check item Corrective action
Check that five seconds have passed since the power supply module is
powered off.
After the power supply module is powered off, wait at least five seconds
before turning on the input power supply to the power supply module.
Check item Cause Corrective Action
Check whether the module is in offset/gain setting
mode.
In the module parameter setting of the engineering
tool, the programmable controller power supply
has been turned off and on, or the CPU module
has been reset when "Operation mode setting" is
"Offset/gain setting mode".
In the module parameter setting of the engineering
tool, set "Operation mode setting" to "Normal mode
(A/D conversion process)" and turn off and on the
programmable controller power supply, or reset the
CPU module.
The G(P).OFFGAN instruction has been executed
with the mode switched to offset/gain setting mode.
Review the program that uses the G(P).OFFGAN
instruction to check whether the mode has been
switched erroneously.
The value in 'Mode switching setting' (Un\G296,
Un\G297) has been changed and the mode has
been switched to the offset/gain setting mode.
Review the program that uses 'Mode switching
setting' (Un\G296, Un\G297) to check whether the
mode has been switched erroneously.
Check whether the module is selected as a target
module for the online module change.
The base number and slot number of the A/D
converter module have been set in Module
selection (base unit No.) (SD1600) or Module
selection (slot No.) (SD1601).
Turn on Module selection cancel request flag
(SM1615).
Check item Corrective Action
Check whether the power is supplied. Check that the supply voltage of the power supply module is within the rated
range.
Check whether the capacity of the power supply module is enough.
Calculate the current consumption of mounted modules, such as the CPU
module, I/O modules, and intelligent function modules to check that the power
capacity is enough.
Check whether the module is mounted properly. Check the mounting state of the module.
Check whether the module is during online module change and is ready for
the online module change.
Perform the online module change. For details, refer to the following manual.
MELSEC iQ-R Online Module Change Manual
Cases other than the above 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.
Check item Corrective Action
Check whether any error has occurred. Check 'Latest error code' (Un\G0) and take actions described in the list of
error codes.
Page 108 List of Error Codes
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