Mitsubishi MELSEC-A series Programming Manual

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ERROR CODE LIST9.
Table 9.3 Error Code List for AnACPU and A3A Board (Continue)
Error Massage
Error
Code
(D9008)
Detailed
Error
Code
(D9091)
CPU
States
Error and Cause Corrective Action
"UNIT VERIFY
ERR."
(Checked
continuously.)
31 — Stop or
Continue
(set by
parameter)
Current I/O module information is
different from that recognized when the
power was turned on.
(1) The I/O module (including special
function modules) connection
became loose or the module was
disconnected during operation, or
wrong module was connected.
Read detailed error code using a
peripheral device and check or replace
the module which corresponds to the
data (I/O head number).
Or, monitor special registers D9116 to
D9123 using a peripheral device and
check or replace the modules if
corresponding data bit is "1".
"FUSE BREAK
OFF"
(Checked
continuously.)
32 — Stop or
Continue
(set by
parameter)
There is an output module of which
fuse is blown.
(1) Check the FUSE BLOWN indicator
LED on the output module and
replace the fuse.
(2) Read detailed error code using a
peripheral device and replace the
fuse of the output module which
corresponds to the data (I/O head
number).
Or, monitor special registers D9100 to
D9107 using a peripheral device and
replace the fuse of the output module
of which corresponding data bit is "1".
"CONTROL-
BUS ERR."
40 401 STOP Due to the error of the control bus
which connects to special function
modules, the / instruction
cannot be executed.
Since it is a hardware error of special
function module, CPU module or base
module, replace and check defective
module(s). Consult Mitsubishi
representative for defective modules.
402 If parameter I/O assignment is being
executed, special function modules are
not accessible at initial communication.
At error occurrence, the head I/O
number (upper 2 digits of 3 digits) of the
special function module that caused
error is stored at D9011.
"SP.UNIT
DOWN"
41 411
STOP
Though an access was made to a
special function module at execution of
the / instruction, no response
is received.
Since it is hardware error of the special
function module to which an access was
made, consult Mitsubishi representative.
412 If parameter I/O assignment is being
executed, no response is received from
a special function module at initial
communication.
At error occurrence, the head I/O
number (upper 2 digits of 3 digits) of the
special function module that caused
error is stored at D9011.
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Mitsubishi MELSEC-A series Specifications

General

Brand	Mitsubishi
Model	MELSEC-A series
Category	Controller
Language	English