Mitsubishi Electric MELCEC Q Series User Manual page 183

11. TROUBLESHOOTING
Error
Error Massage Code
(D9008)
"RAM ERROR" 20
(Checked at
power on.)
"RAM ERROR"
(Checked at
execution of the
END
instruction.)
"OPE CIRCUIT 21
ERROR"
(Checked at
power on.)
"OPE. CIRCUIT
ERR."
(Checked at
execution of the
END
instruction.)
"WDT ERROR" 22
(Checked at
execution of
END
processing.)
"END NOT 24
EXECUTE"
(Checked at
execution of the
END
instruction.)
"MAIN CPU 26
DOWN"
"UNIT VERIFY 31
ERR"
(Checked
continuously.)
Table 11.1 Error Code List for QCPU-A (A Mode) (continued)
Detailed
Error CPU
Code States
(D9091)
201 STOP The sequence program storage RAM in
the CPU module caused an error.
202 The work area RAM in the CPU module
caused an error.
203 The device memory in the CPU module
caused an error.
204 The address RAM in the CPU module
caused an error.
211 STOP The operation circuit for index
qualification in the CPU does not work
correctly.
212 Hardware (logic) in the CPU does not
operate correctly.
213 The operation circuit for sequential
processing in the CPU does not operate
correctly.
214 In the END processing check, the
operation circuit for index qualification
in the CPU does not work correctly.
215 In the END processing check, the
hardware in the CPU does not operate
correctly.
— STOP Scan time is longer than the WDT time.
(1) Scan time of the user's program has
been extended due to certain
conditions.
(2) Scan time has been extended due to
momentary power failure occurred
during scanning.
241 STOP Whole program of specified program
capacity was executed without
executing the
(1) When the
executed, the instruction was read
as other instruction code due to
noise.
(2) The
other instruction code due to
unknown cause.
— STOP The main CPU is malfunctioning or
faulty.
Current I/O module information is
— Stop or
Continue different from that recognized when the
(set by power was turned on.
parameter) (1) The I/O module (including special
function modules) connection
became loose or the module was
disconnected during operation, or
wrong module was connected.
Error and Cause
instructions.
END
instruction was to be
END
instruction changed to
END
11 - 16
Corrective Action
Since this is CPU hardware error, please
consult your local Mitsubishi
representative.
Since this is CPU hardware error, please
consult your local Mitsubishi
representative.
(1) Check the scan time of the user's
program and shorten it using the
instructions.
(2) Monitor contents of special register
D9005 using a peripheral device. If
the contents are other than 0, power
supply voltage may not be stable.
Check power supply and reduce
variation in voltage.
(1) Reset and run the CPU again. If the
same error recurs, Since this is CPU
hardware error, please consult your
local Mitsubishi representative.
Since this is CPU hardware error, please
consult your local Mitsubishi
representative.
Read detailed error code using a
peripheral device and check or replace
the module which corresponds to the
data (I/O head number).
Or, monitor special registers D9116 to
D9123 using a peripheral device and
check or replace the modules if
corresponding data bit is "1".
CJ