Mitsubishi MELSEC-A A1SCPUC24-R2, User Manual

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90
"WDT ERROR"
(Checked
continuously)
25 Stop
The CPU is executing an
endless loop.
Since the program is in
an endless lop due to
the
and
instructions, check the
program.
"MAIN CPU
DOWN"
(Checked
continuously)
26 Stop
Main-CPU is out of
control or defective.
(Sub-CPU checked it.)
Since this is a CPU
hardware error, consult
Mitsubishi
representative.
"UNIT
VERIFY ERR. "
(Checked
continuously)
31
Stop or
Continue
(set by
para-
meter)
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.
Table 6.1 Error Code List for A1SCPUC24-R2 (Continue)
Error Message
Error Code
(D9008)
CPU
States
Error and Cause Corrective Action
JMP CJ