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MELSEC-Q
11 TROUBLESHOOTING
Error Code
(SD0)
1
Error Contents and Cause Corrective Action
Corres-
ponding
CPU
• There was no response from the intelligent function module during
initial communication stage.
• The size of the buffer memory of the intelligent function module is
wrong.
The CPU module is experiencing hardware problems. Contact your
nearest Mitsubishi representative.
QCPU
Rem
1401
When parameter I/O allocation was being made, there was no
return signal from the special function module during initial
processing stage.
When error is generated, the initial I/O number of the special
function module that corresponds to the common information is
stored.
The special function module that was being accessed is
experiencing hardware problems. Contact your nearest Mitsubishi
representative.
QnA
The intelligent function module was accessed in the program, but
there was no response.
This suggests a CPU module hardware error. Contact your nearest
Mitsubishi representative.
QCPU
Rem
1402
The special function module was accessed during the execution of
a FROM/TO instruction set, but there was no response.
When an error is generated, the program error location
corresponding to the individual information is stored.
The special function module that was being accessed is
experiencing hardware problems. Contact your nearest Mitsubishi
representative.
QnA
1403
• There was no response from the intelligent function module when
the END instruction is executed.
• An error is detected at the intelligent function module.
The intelligent function module that was being accessed is
experiencing hardware problems. Contact your nearest Mitsubishi
representative.
QCPU
Rem
1411
When performing a parameter I/O allocation a special function
module could not be accessed during initial communications.
On error occurring, the head I/O number of the corresponding
special function module is stored in the common information.
Rem
1412
The FROM/TO instruction set could not be executed, due to a
system bus error with a special function module.
On error occurring, the program error location is stored in the
individual information.
A special function module, the CPU module, or the base unit is
experiencing problems. Contact your nearest Mitsubishi
representative.
The High Performance model QCPU of function version A was
loaded in a multiple CPU system configuration.
(1) Change the High Performance model QCPU of function version
A for the High Performance model QCPU of function version B.
(2) An intelligent function module, CPU module or the base unit is
experiencing problems. Contact your nearest Mitsubishi
representative.
QCPU
function
Ver. B
or later
1413
An error is detected on the system bus.
• Wait-length time-out, arbitration time-out.
An intelligent function module, the CPU module, or the base unit is
experiencing problems. Contact your nearest Mitsubishi
representative.
QCPU
Rem
Fault of the loaded module was detected.
The High Performance model QCPU of function version A was
loaded in a multiple CPU system configuration.
(1) Change the High Performance model QCPU of function version
A for the High Performance model QCPU of function version B.
(2) An intelligent function module, CPU module or the base unit is
experiencing problems. Contact your nearest Mitsubishi
representative.
QCPU
function
Ver. B
or later
1414
An error is detected on the system bus.
An intelligent function module, the CPU module, or the base unit is
experiencing problems. Contact your nearest Mitsubishi
representative.
QCPU
Rem
1415 Fault of the main or extension base unit was detected.
1416
System bus fault was detected at PLC power-on or CPU module
reset.
An intelligent function module, CPU module or the base unit is
experiencing problems. Contact your nearest Mitsubishi
representative.
QCPU
function
Ver. B
or later
1421 Hardware fault at the system management module AS92R.
This is experiencing hardware problems.
Contact your nearest Mitsubishi representative.
Q4AR
1500
A momentary power supply interruption has occurred.
The power supply went off.
Check the power supply.
Rem
1510
The 5 VDC supplied to one of the two power-supply modules in the
redundant system extension base unit has dropped below 85% of
the rated voltage.
1520
The 5 VDC supplied to the power-supply modules in the extension
base unit has dropped below 80% of the rated voltage.
Check the supply voltage of the power supply module. If the voltage
is abnormal then replace the power supply module.
1530
The 24 VDC power supplied to the system management module
AS92R has dropped below 85% of the rated voltage.
Check the power supply.
Q4AR
1600
(1) Voltage in the CPU module battery.
(2) The CPU module battery is not connected.
(1) Change the battery.
(2) If the battery is for program memory, standard RAM or for the
back-up power function, install a lead connector.
1601
Voltage of the battery on memory card 1 has dropped below
stipulated level.
Change the battery.
1602
Voltage of the battery on memory card 2 has dropped below
stipulated level.
Change the battery. QnA
I/O module information power ON is changed.
I/O module (or special function module) not installed properly or
installed on the base unit.
Read the error common information at the peripheral device, and
check and/or change the module that corresponds to the numerical
value (module number) there.
Alternatively, monitor the special registers SD1400 to SD1431 at a
peripheral device, and change the fuse at the output module whose
bit has a value of "1".
Rem
2000
The High Performance model QCPU of function version A was
loaded in a multiple CPU system configuration.
Change the High Performance model QCPU of function version A
for the High Performance model QCPU of function version B.
QCPU
function
Ver. B
or later
1 Characters in parentheses ( ) indicate the special register numbers where individual information is being stored.