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Table 6.1 Error Code List for AnNCPU (Continue)
Error
Error
Code
Message
(D9008)
"SP. UNIT
41
DOWN"
(Checked at
the execution
of FROM and
TO
instructions.)
"LINK UNIT
42
ERROR"
"I/O INT.
43
ERROR"
"SP. UNIT
44
LAY.
ERROR."
CPU
Error and Cause
States
Stop
When the
FROM
TO
instruction is
executed, access has been
made to the special function
module but the answer is
not given.
The accessed special
function module is
defective.
Stop
The data link module is
loaded in the master
station.
Stop
Although the interrupt
module is not loaded,
interruption has occurred.
Stop
(1) Three or more computer
link units are loaded with
respect to one CPU
module.(A1SCPU24-R2
is also counted as one
unit.)
(2) Two or more data link
modules are loaded.
(3) Two or more interrupt
units are loaded.
(4) A special function
module is assigned in
place of an I/O module,
or vice versa, at I/O
assignment of
parameters on
peripheral devices.
(5) The input/output
modules or special
function modules are
loaded at the
input/output numbers
exceeding the number
of input/output points, or
GOT is connected via
bus line.
90
Corrective Action
Since this is an accessed
or
special function module
error, consult Mitsubishi
representative.
Remove the data link
module from the master
station. After correction,
reset and start from the
initialization.
Since this is a hardware
error of a specific module,
replace the module and
check the defective module,
consult Mitsubishi
representative.
(1) Reduce the computer
link modules to two or
less.
(2) Reduce the data link
modules to one or less.
(3) Reduce the interrupt
module to one.
(4) Re-set the I/O
assignment of
parameter setting by
use of peripheral
devices according to the
actually loaded special
function module.
(5) Review the input/output
numbers, and remove
the modules at the
input/output numbers
beyond the number of
input/output points or
GOT.

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