
11. TROUBLESHOOTING
11 - 13
MELSEC-A
Table 11.1 Error codes (Continue)
Error Message
Error
Code
(D9008)
Detailed
Error
Code
(D9092)
CPU
States
Error and Cause
Corrective Action
"UNIT
VERIFY ERR."
31
Stop
or
Contin
ue
(set by
para-
meter)
I/O module data are different from
those at power-on.
(1)
The I/O module (including the
special function module) is
incorrectly loaded or has been
removed, or a different unit has
been loaded.
(1)
The bit in special registers D9116
to D9123 corresponding to the
module causing the verification
error is “1.” Use a peripheral
device to monitor the registers to
locate the “1” bit, and check or
replace the corresponding
module.
(2)
To accept the current module
arrangement, operate the
RUN/STOP key switch to reset.
"FUSE BREAK
OFF"
32
Stop
or
Contin
ue
(set by
para-
meter)
(1)
The fuse is blown in some output
modules.
(2)
The external power supply for
the output load is turned off or it
is disconnected.
(1)
Check the ERR LED of the output
module. Replace the module with
the lit LED.
(2)
Among special registers D9100
to
D9107, the bit corresponding to
the unit of fuse break is "1"
Replace the fuse of a
corresponding module.
Monitor and check it.
(3)
Check ON/OFF of the external
power supply for the output load.
"CONTROL-
BUS ERR."
40
Stop
The FROM and TO instructions
cannot be executed.
(1)
Error of control bus with special
function module.
The hardware of the special function
module, CPU module or base unit is
faulty. Replace the faulty module and
check the faulty module. Consult
Mitsubishi representative.
"SP. UNIT
DOWN"
41
Stop
There is no reply from the special
function module during execution of
the FROM or TO instruction.
(1)
The special function module
being accessed is faulty.
The hardware of the special function
module being accessed is faulty.
Consult Mitsubishi representative.
"I/O INT.
ERROR"
43
Stop
Interrupt occurs though no interrupt
module is installed.
The hardware of a module is faulty.
Replace the module and check the
faulty module. Consult Mitsubishi
representative.
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