Mitsubishi MELSEC-A A1SCPUC24-R2 User Manual page 143

Table 6.3 Error Code List for A2ASCPU(S1/S30) and A2USHCPU-S1 (Continue)
Error
Error
Code
Massage
(D9008)
"CONTROL-
40
BUS ERR"
"SP.UNIT
41
DOWN"
"LINK UNIT
42
ERROR"
Detailed
Error CPU
Code States
(D9091)
401
STOP
402
411
STOP
412
— STOP
117
Error and Cause
Due to the error of the
control bus which
connects to special
function modules, the
/ instruction
FROM TO
cannot be executed.
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.
Though an access was
made to a special function
module at execution of the
/ instruction no
FROM TO
response is received.
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.
(1) Either data link
module is loaded to
the master station.
(2) There are 2 link
modules which are
set to the master
station (station 0).
Corrective Action
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.
(1) Remove data
link module
from the
master station.
(2) Reduce the
number of
master
stations to 1.
Reduce the
link modules to
1 when the
3-tier system is
not used.