Mitsubishi MELSEC-A A1SCPUC24-R2 User Manual page 115

Table 6.1 Error Code List for A1SCPUC24-R2 (Continue)
Error Code
Error Message
"RAM ERROR"
(Checked at
power-on)
"OPE. CIRCUIT
ERR"
(Checked at
power-on)
"WDT ERROR"
(Checked at the
execution of END
processing)
"SUB-CPU
ERROR" (During run)
(Checked (At power-
continuously)
"END NOT
EXECUTE"
(Checked at the
execution of END
instruction)
CPU
(D9008) States
20 Stop
21 Stop
22 Stop
23
26 Stop
on)
24 Stop
Error and Cause
The CPU has checked if
write and read
operations can be
performed properly to
the data memory area of
CPU, and as a result,
either or both has not
been performed.
The operation circuit,
which performs the
sequence processing in
the CPU, does not
operate properly.
Scan time exceeds
watch dog error monitor
time.
(1) Scan time of user
program has been
exceeded for some
conditions.
(2) Scan time has
lengthened due to
instantaneous
power failure which
occurred during
scan.
Sub-CPU is out of
control or defective.
(1) When the
END
instruction was to be
executed, the
instruction was read
as other instruction
code due to noise or
the like.
(2) The instruction
END
has changed to
another instruction
code for some
reason.
89
Corrective Action
Since this CPU
hardware error, consult
Mitsubishi
representative.
(1) Calculate and
check the scan time
of user program
and reduce the
scan time using the
instruction or
CJ
the like.
(2) Monitor the content
of special register
D9005 by use of
peripheral
equipment. When
the content is other
than 0, line voltage
is insufficient.
When the content is
other than 0, the
power voltage is
unstable.
Since this CPU
hardware error, consult
Mitsubishi
representative.
Perform reset and run.
If the same error is
displayed again, it is the
CPU hardware error,
consult Mitsubishi
representative.