Mitsubishi Electric QJ71LP21 Reference Manual page 253

8 TROUBLESHOOTING
Error Code
Error Contents and Cause
*1
(SD0)
1415 Fault of the main or extension base unit was detected.
System bus fault was detected at PLC power-on or CPU
module reset.
1416
In a multiple CPU system, a bus fault was detected at
power-on or reset.
1417 A reset signal error was detected on the system bus.
Hardware fault at the system management module
1421
AS92R.
• A momentary power supply interruption has occurred.
1500
• The power supply went off.
The power supply voltage (100 - 240VAC) of either of the
two power supply modules on the power supply duplexing
extension base unit dropped to or below 85% of the rated
1510
voltage.
The power supply voltage of either power supply module
dropped in the redundant base unit.
The power supply voltage(100 - 240VAC) of the power
supply module on the extension base unit dropped to or
below 85% of the rated voltage.
1520
A fault of either redundant power supply module was
detected in the redundant power supply system.
The 24 VDC power supplied to the system management
1530 module AS92R has dropped below 90% of the rated
voltage.
• Voltage in the CPU module battery has dropped below
1600 stipulated level.
• The CPU module battery is not connected.
Voltage of the battery on memory card 1 has dropped
1601
below stipulated level.
Voltage of the battery on memory card 2 has dropped
1602
below stipulated level.
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being stored.
*12 : This applies to the CPU of function version B or later.
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Corrective Action
Reset the CPU module and RUN it again. If the same
error is displayed again, the intelligent function module,
CPU module or base unit is faulty.
(Contact your nearest Mitsubishi representative.)
Reset the CPU module and RUN it again. If the same
error is displayed again, the intelligent function module,
CPU module or base unit is faulty.
(Contact your nearest Mitsubishi representative.)
This suggests a system management module AS92R
hardware fault.
(Contact your nearest Mitsubishi representative.)
Check the power supply.
Check the supply voltage of the power supply module. If
the voltage is abnormal then replace the power supply
module.
Check the power supplied to the redundant power supply
modules mounted on the redundant base units.
Check the supply voltage of the power supply module. If
the voltage is abnormal then replace the power supply
module.
Hardware fault of the redundant power supply module.
(Contact your local Mitsubishi representative, explaining a
detailed description of the problem.)
Check the 24VDC power supplied to the system
management module AS92R.
• Change the battery.
• If the battery is for program memory, standard RAM or
for the back-up power function, install a lead connector.
Change the battery.
Change the battery.
MELSEC-Q
Corresponding CPU
Q00J/Q00/Q01
*12
Qn(H)
QnPH
QnPRH
*12
Qn(H)
QnPH
*12
Q00/Q01
QnPRH
Q4AR
Rem
Q4AR
QnPRH
Rem
Q4AR
QnPRH
Rem
Q4AR
QnA
Qn(H)
QnPH
QnPRH
QnA
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