User`s manual

Error code list Troubleshooting
MELSEC System Q, Hardware 11 – 35
1418
CONTROL-BUS ERR.
In the redundant system, at power-on/reset or
switching system, the control system cannot
access the extension base unit since it failed to
acquire the access right.
 Collateral information

Common Information: —
 Individual Information: —
 Diagnostic Timing
At power ON/ At reset/At Switching execution
Reset the CPU module and RUN it again. If the
same error is displayed again, the CPU module,
the Q6WRB, or hardware of extension cable is
faulty.
Contact your local Mitsubishi representative.
OFF Flicker Stop QnPRH (first 5
digits of serial
No. is 09012 or
later)
1430
MULTI-C.BUS ERR.
The error of host CPU is detected in the Multiple
CPU high speed bus.
 Collateral information

Common Information: —
 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 CPU module
has hardware failure.
Contact your local Mitsubishi representative.
OFF Flicker Stop QnU (except
Q00UJ-, Q00U-,
Q01U- and
Q02UCPU)
1431
MULTI-C.BUS ERR.
The communication error with other CPU is
detected in the Multiple CPU high speed bus.
 Collateral information

Common Information: Module No. (CPU No.)
 Individual Information: —
 Diagnostic Timing
At power ON/ At reset
– Take noise reduction measures.
– Reset the CPU module and RUN it again. If the
same error is displayed again, the CPU mod-
ule has hardware failure.
Contact your local Mitsubishi representative.
1432
MULTI-C.BUS ERR.
The communication time out with other CPU is
detected in the Multiple CPU high speed bus.
 Collateral information

Common Information: Module No. (CPU 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 CPU module
has hardware failure.
Contact your local Mitsubishi representative.
1433 MULTI-C.BUS ERR.
The communication error with other CPU is
detected in the Multiple CPU high speed bus.
 Collateral information

Common Information: Module No. (CPU No.)
 Individual Information: —
 Diagnostic Timing
Always
– Take noise reduction measures.
– Check the main base unit mounting status of
the CPU module.
– Reset the CPU module and RUN it again. If the
same error is displayed again, the CPU mod-
ule has hardware failure.
Contact your local Mitsubishi representative.
1434
1435
1436
MULTI-C.BUS ERR.
The error of the Multiple CPU high speed main
base unit is detected. (The error of the Multiple
CPU high speed bus is detected.)
 Collateral information

Common Information: —
 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 CPU module
has hardware failure.
Contact your local Mitsubishi representative.
1437
– Take noise reduction measures.
– Check the main base unit mounting status of
the CPU module.
– Reset the CPU module and RUN it again. If the
same error is displayed again, the CPU mod-
ule has hardware failure.
Contact your local Mitsubishi representative.
1439
MULTI-C.BUS ERR.
An error of the multiple CPU high speed main
base unit was detected. (An error of the multiple
CPU high speed bus was detected.)
 Collateral information

Common Information: —
 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 CPU module
has hardware failure.
Contact your local Mitsubishi representative.
OFF Flicker Stop QnU (except
Q00UJ-, Q00U-,
Q01U- and
Q02UCPU)
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