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9.4 Troubleshooting in bus connection
9.4.1 Locating error positions
9 - 11
9
ERROR CODES AND
ERROR MESSAGES
APPENDICESINDEX
(3) Error messages appearing due to faulty Q/QnACPU bus connection and measure against errors
Error
Code
Error
Messages
Check Timing
Cause and check point
Error detail Remedy
Correspond-
ing CPU
1310
I/O INT
ERROR.
During interrupt
An imprecise interrupt occurs to the PLC
CPU.
(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.
QCPU
QnACPU
1401
SP. UNIT
DOWN
At CPU power ON/
At reset/When intel-
ligent function mod-
ule is accessed.
ٛ
There was no response from the intelli-
gent function module during initial com-
munications stage.
• The size of the buffer memory of the
intelligent function module is abnormal.
QCPU
At CPU power ON/
At reset
At the time of initial communication, a
response is not returned from the special
function module (including the GOT).
QnACPU
1402
When an intelligent
function module
access instruction
is executed.
The intelligent function module was
accessed in the program, but there was
no response.
QCPU
During execution of
FROM/TO instruc-
tion set
The special function module was
accessed during the execution of a
FROM/TO instruction set, but there was
no response.
QnACPU
1403
When an End
instruction is exe-
cuted
ٛ
There was no response from the intelli-
gent function module when the END
instruction is executed.
• An error is detected at the intelligent
function module.
QCPU
1411
CONTROL
_BUS
ERR.
At CPU power ON
At the time of initial communication, an
imprecise response is returned from the
special function module (including the
GOT).
(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.)
QCPU
QnACPU
1412
During execution of
FROM/TO instruc-
tion set
When the FROM/TO instruction is exe-
cuted, an imprecise response is returned
from the special function module (includ-
ing the GOT).
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.
2000
UNIT VER-
IFY ERR.
When an End
instruction is exe-
cuted
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 mod-
ule, the mis-operation may be caused by
noise.)
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.
QCPU
QnACPU