User`s manual

Error code list Troubleshooting
MELSEC System Q, Hardware 11 – 33
1403
SP. UNIT DOWN
An unsupported module is mounted.
 Collateral information

Common Information: Module No. (Slot No.)
 Individual Information: —
 Diagnostic Timing
When an END instruction is executed
– When the unsupported module is mounted,
remove it.
– When the corresponding module is sup-
ported, this suggests a hardware fault of the
intelligent function module/special function
module, CPU module and/or base unit.
Contact your local Mitsubishi representative.
Contact your local Mitsubishi representative.
OFF/ON Flicker/
ON
Stop/
Continue
(can be
selected for
each intelli-
gent func-
tion module
by the
parame-
ters)
)
SP. UNIT DOWN
– There was no response from the intelligent
function module/special function module
when the END instruction is executed.
– An error is detected at the intelligent function
module/special function module.
– The I/O module (intelligent function module/
special function module) is nearly removed,
completely removed, or mounted during run-
ning.
 Collateral information

Common Information: Module No. (Slot No.)
 Individual Information: —
 Diagnostic Timing
Always
The CPU module, base module and/or the intelli-
gent function module/special function module
that was accessed is experiencing a hardware
fault.
Contact your local Mitsubishi representative.
1411
CONTROL-BUS ERR.
When performing a parameter I/O allocation the
intelligent function module/special function
module could not be accessed during initial
communications.
(On error occurring, the head I/O number of the
corresponding intelligent function module/spe-
cial function module is stored in the common
information.)
 Collateral information

Common Information: Module No. (Slot No.)
 Individual Information: —
 Diagnostic Timing
At power ON/ At reset
Reset the CPU module and RUN it again. If the
same error is displayed again, the intelligent
function module/special function module, CPU
module or base unit is faulty.
Contact your local Mitsubishi representative.
OFF Flicker Stop )
1412
CONTROL-BUS ERR.
The FROM/TO instruction is not executable, due
to a control bus error with the intelligent function
module/special function module.
(On error occurring, the program error location
is stored in the individual information.)
 Collateral information

Common Information: Module No. (Slot No.)
 Individual Information: Program error loca-
tion
 Diagnostic Timing
During execution of FROM/TO instruction set
Reset the CPU module and RUN it again. If the
same error is displayed again, the intelligent
function module/special function module, CPU
module or base unit is faulty.
Contact your local Mitsubishi representative.
OFF Flicker Stop )
1413
CONTROL-BUS ERR.
In a multiple CPU system, a CPU module incom-
patible with the multiple CPU system is moun-
ted.
 Collateral information

Common Information: —
 Individual Information: —
 Diagnostic Timing
Always
– Remove the CPU module incompatible with
the multiple CPU system from the main base
unit, or replace the CPU module with a CPU
module compatible with the multiple CPU
system.
– The intelligent function module, CPU module
or base unit is faulty.
Contact your local Mitsubishi representative.
OFF Flicker Stop Q00J/Q00/Q01
(Function
version is B or
later)
Qn(H)
(Function
version is B or
later)
QnPH
CONTROL-BUS ERR.
An error is detected on the system bus.
 Collateral information

Common Information: —
 Individual Information: —
 Diagnostic Timing
Always
Reset the CPU module and RUN it again. If the
same error is displayed again, the intelligent
function module, CPU module or base unit is
faulty.
Contact your local Mitsubishi representative.
)
Error
code
Error contents and cause Corrective action
LED status
CPU
status
Corre-
sponding
CPU
RUN ERR.
Tab. 11-3: Error code list (1000 to 1999) for PLC CPUs of MELSEC System Q