Mitsubishi Electric A960GOT User Manual page 97

8 ERROR CODES AND ERROR MESSAGES
Error Error
Check Timing
Code Messages
1310 I/O INT During interrput
ERROR.
SP. UNIT At CPU power ON/
1401
DOWN At reset/When
intelligent function
module is
accessed.
At CPU power ON/
At reset
When an intelligent
1402
function module
access instruction
is executed.
During execution of
FROM/TO
instruction set
When an End
1403
instruction is
executed
CONTROL_ At CPU power ON At the time of initial communication, an
1411
BUS ERR.
During execution of
1412
FROM/TO
instruction set
2000 UNIT When an End
VERIFY instruction is
ERR. executed
8 - 10
(3) Error messages appearing due to faulty Q/QnACPU bus
connection and measure against errors
Error detail
An imprecise interrupt occurs to the
PLC CPU.
There was no response from the
intelligent function module during initial
communications stage.
The size of the buffer memory of the
intelligent function module is
abnormal.
At the time of initial communication, a
response is not returned from the
special function module (including the
GOT).
The intelligent function module was
accessed in the program, but there was
no response.
The special function module was
accessed during the execution of a
FROM/TO instruction set, but there was
no response.
There was no response from the
intelligent function module when the
END instruction is executed.
An error is detected at the intelligent
function module.
imprecise response is returned from the
special function module (including the
GOT).
When the FROM/TO instruction is
executed, an imprecise response is
returned from the special function
module (including the GOT).
The information stored in the cards of
the module installed in the base module
and the communication module of the
GOT is different from that read at the
initial time.
(If an error occurs on a module (vacant)
other than that installed in the base
module, the mis-operation may be
caused by noise.)
Cause and check point
Remedy
(1) Check that the module and the
cables are connected correctly.
(2) Replace the faulty module and the
cables with new ones.
(3) Check that the PLC and the GOT
are earthed correctly.
(4) Check the number of extension
stages and the I/O slot numbers.
(1) Check that the module and the
cables are connected correctly.
(2) Because a faulty module cannot be
located, remove the modules one
by one until no CONTROL_BUS
ERR. message appears to indicate
the module where the error occurs.
(Because the modules are
removed, SP. UNIT ERR.
message may appear. Stop
transmitting the FROM/TO
instruction to the applicable
module.)
Check the faulty module from the error
step.
(1) Check that the module and the
cables are connected correctly.
(2) Replace the faulty module with a
new one.
(3) Check that the PLC and the GOT
are earthed correctly.
Check the faulty module at special
resisters SD1400 to SD1431.
(1) Check that the module and the
cables are connected correctly.
(2) Check that the PLC and the GOT
are earthed correctly.
MELSEC-GOT
Corresponding
CPU
QCPU
QnACPU
QCPU
QnACPU
QCPU
QnACPU
QCPU
QCPU
QnACPU
QCPU
QnACPU
8 - 10