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APPENDICES
Error Message
"UNIT VERIFY ERR."
When an END instruction is executed.
However, no check is performed when
M9084 or M9094 is ON.
"FUSE BREAK OFF"
When an END instruction is executed.
However, no check is performed when
M9084 or M9094 ON.
"CONTROL-BUS ERR."
When FROM, TO instruction are executed.
On switching on the power or resetting.
On switching from
STOP
to
PAUSE
"SP.UNIT DOWN"
When FROM, TO instruction are executed.
On switching on the power or resetting.
On switching from
STOP
to
PAUSE
"LINK UNIT ERROR"
On switching on the power or resetting.
On switching from
STOP
to
PAUSE
"I/O INT.ERROR"
(When an interruption occurs.)
"SP.UNIT LAY.ERR."
On switching on the power or resetting.
On switching from
STOP
to
PAUSE
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Table 1.1 CPU Error Code List (Continued)
Contents of
Special
Register
D9008
(BIN Value)
31
32
(Stopped)
40
RUN
STEP RUN
41
RUN
STEP RUN
42
RUN
STEP RUN
43
44
RUN
STEP RUN
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CPU
Error Contents and Cause
Status
The I/O information does not match a loaded module
when the power is switched ON.
(1) An I/O module (this includes special function
modules) is loose, or has become detached, during
operation. Or, a completely different module has
Stopped
been loaded.
(RUN)
There is an output module with a blown fuse.
RUN
FROM, TO instructions cannot be executed.
(1) Fault in the control bus to the special function
module.
Stopped
On execution of a FROM, TO instruction, a special
function module was accessed but no response was
received.
(1) The accessed special function module is faulty.
Stopped
(1) A data link module for use with MELSECNET has
been loaded at the master station.
Stopped
An interruption has occurred although there is no
interrupt module.
Stopped
(1) Three or more computer link modules have been
installed for one CPU module.
(2) Two or more data link modules for MELSECNET
have been installed.
Stopped
(3) Two or more interrupt modules have been installed.
(4) In the parameter settings made at a peripheral
device, an allocation for a special function module
has been made where there is in fact an I/O module,
or vice versa.
APP − 3
Corrective Action
(1) The bit in special registers D9116
to D9123 that corresponds to the
module for which the verification
error occurred will be set to "1":
check for the module whose bit is
set to "1" by monitoring these
registers with a peripheral device
and replace that module.
(2) If the current arrangement of
loaded modules is acceptable,
reset with the reset switch.
(1) Check the blown fuse indicator
LEDs of the output modules and
replace the fuse of the module
whose indicator LED is lit.
(2) Modules with blown fuses can also
be detected by using a peripheral
device.
The bit in special registers D9100
to D9107 that corresponds a
module whose fuse has blown will
be set to "1": monitor these
registers to check.
(1) There is a hardware fault of the
special function module, CPU
module, or base unit: replace each
module/unit to find the defective
one.
Contact your nearest Mitsubishi
system service, agent, or office,
and explain the problem with the
defective module/unit.
There is a hardware fault in the
accessed special function module:
contact your nearest Mitsubishi system
service, agent, or office, and explain
the problem.
(1) Remove the data link module for
MELSECNET from the master
station.
After making this correction, reset
and start operation from the initial
status.
(1) There is a hardware fault in one of
the modules: replace each module
in turn to determine which one is
defective. Contact your nearest
Mitsubishi system service, agent, or
office, and explain the problem with
the defective module.
(1) Do not install more than two
computer link modules.
(2) Do not install more than one data
link module for MELSECNET.
(3) Install only one interrupt module.
(4) Re-set the I/O allocations in the
parameter settings made at the
peripheral device so that they
agree with the loaded modules.
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