Mitsubishi MELSEC-A series, Programming Manual

Page: 370 / 508

9 - 4
ERROR CODE LIST 9.
Table 9.1 Error Code List for the An, AnN, A3H, A3M, A3V, A0J2H, AnS, A2C, A73, A52G, A1FX and A3N board (Continue)
Error Message
Error Code
(D9008)
CPU States Error and Cause Corrective Action
"UNIT
VERIFY ERR. "
(Checked
continuously)
31 Stop or
Continue
(set by
parameter)
I/O module data are different from those
at power-on.
The I/O module (including the special
function module) is incorrectly loaded or
has been removed, or a different unit
has been loaded. (1) Among special registers D9116 to
D9123, the bit corresponding to the
module of verify error is "1".
Therefore, use peripheral equipment
to monitor the registers and check
for the module with “1” and make
replacement.
(2) When the present unit arrangement
is OK, perform reset with the reset
switch.
"FUSE BREAK
OFF"
(Checked
continuously)
32 Stop or
Continue
(set by
parameter)
(1) A fuse is blown in an output modul.
(2) The external output supply for output
load is not turned off or not
connected.
(1) Check the fuse blown indicator LED
of output module and change the
fuse of module of which LED is on.
(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 if the external power supply
for output load is turned on or off.
"CONTROL-
BUS ERR. "
(Checked at the
execution of
FROM and TO
instructions)
40 Stop The and instructions can-not
be executed.
Error of control bus with special function
module.
Since this is a hardware error of a
special function module, CPU module,
or base unit, replace the module and
check the defective module, consult
Mitsubishi representative.
"SP. UNIT DOWN"
(Checked at the
execution of
FROM and TO
instructions.)
41 Stop When the or 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.
Since this is an accessed special
function module error, consult Mitsubishi
representative.
"LINK UNIT
ERROR"
42 Stop The data link module is loaded in the
master station. Remove the data link module from the
master station. After correction, reset
and start from the initialization.
"I/O INT. ERROR" 43 Stop Although the interrupt module is not
loaded, interruption has occurred. Since this is a hardware error of a
specific module, replace the module and
check the defective module, consult
Mitsubishi representative.
"SP. UNIT LAY.
ERROR."
44 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.
(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.
FROM TO
FROM TO