Mitsubishi MELSEC-A Series Programming Manual page 382

9. ERROR CODE LIST
Error
Error Massage Code
(D9008)
"UNIT VERIFY 31
ERR."
(Checked
continuously.)
"FUSE BREAK 32
OFF"
(Checked
continuously.)
"CONTROL- 40
BUS ERR."
"SP.UNIT 41
DOWN"
Table 9.3 Error Code List for AnACPU and A3A Board (Continue)
Detailed
Error CPU
Code States
(D9091)
— Stop or Current I/O module information is
Continue different from that recognized when the
(set by power was turned on.
parameter) (1) The I/O module (including special
function modules) connection
became loose or the module was
disconnected during operation, or
wrong module was connected.
— Stop or There is an output module of which
Continue fuse is blown.
(set by
parameter)
401 STOP Due to the error of the control bus
which connects to special function
modules, the
cannot be executed.
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.
411 Though an access was made to a
STOP
special function module at execution of
the
FROM TO
is received.
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.
Error and Cause
/ instruction
FROM TO
/ instruction, no response
9 - 16
Corrective Action
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".
(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".
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.
Since it is hardware error of the special
function module to which an access was
made, consult Mitsubishi representative.