754
APPX
Appendix 1 Error Codes
3747H Redundant
system error
• The system cannot be started as a
control system because the CPU
module of the other system has
been stopped due to a stop error.
Stop • Eliminate the error cause, and restart
the CPU modules in both systems.
At power-on,
at RESET
3748H Redundant
system error
• The systems were started in a
state where the CPU modules with
firmware versions that cannot be
used together are mounted.
• The systems were started with the
Process CPU and the SIL2
Process CPU.
Stop • Replace one CPU module with the one
having a firmware version that can be
used with the other CPU module
together, referring to the MELSEC iQ-R
Module Configuration Manual. Then,
restart the system.
• Mount the same CPU module, and
restart the CPU module.
At power-on,
at RESET
3749H Redundant
system error
• Both systems are set as control
systems.
(The error is detected in both
systems.)
Stop • Take measures to reduce noise.
• Reset the CPU modules in both
systems and run them again. If the
same error code is displayed again, the
possible cause is a hardware failure of
the CPU module of the own or other
system. Please consult your local
Mitsubishi representative.
At END
instruction
execution
3760H Control system
CPU module
error
• In backup mode, a stop error of
the control system CPU module
was detected. (The error is
detected in the standby system.)
Stop • Eliminate the error cause, and restart
the CPU modules in both systems.
Always
3780H Redundant
system
configuration
error
• A network module that does not
support the redundant system
function is mounted.
• A network module with a firmware
version that does not support the
redundant system function is
mounted.
• A network type other than
"Ethernet" is set to port 1 and/or
port 2 of the Ethernet interface
module.
Stop • Check the detailed information (system
configuration information) of the error
by executing module diagnostics using
the engineering tool, and check the
module corresponding to the displayed
slot number. If the module does not
support the redundant system function,
remove the module from the base unit.
• Check the firmware version of the
corresponding module. If the module
does not support the redundant system
function, remove the module from the
base unit.
• Set the network type of both port 1 and
port 2 to "Ethernet" in the system
parameters ("I/O Assignment Setting").
If the same error code is displayed
again, the possible cause is a
hardware failure of the CPU module,
base unit, or network module. Please
consult your local Mitsubishi
representative.
System
configuration
information
At power-on,
at RESET
3781H Redundant
system
configuration
error
• Two or more redundant function
modules are mounted.
Stop • Mount only one redundant function
module.
System
configuration
information
At power-on,
at RESET
3782H Redundant
system
configuration
error
•
An extension base unit is
connected.
Stop • Remove all extension base units. System
configuration
information
At power-on,
at RESET
3783H Redundant
system
configuration
error
• In redundant mode, nine or more
CC-Link IE Field Network modules
or CC-Link modules are mounted.
Stop • Reduce the number of CC-Link IE Field
Network modules and CC-Link
modules to eight or less for each.
System
configuration
information
At power-on,
at RESET
3784H Redundant
system
configuration
error
• The redundant function module is
not mounted next to the control
CPU set to redundant mode.
Stop • Mount the redundant function module,
and restart the system. Or, set the CPU
module to process mode, and restart
the system. If the same error code is
displayed again, the possible cause is
a hardware failure of the CPU module.
Please consult your local Mitsubishi
representative.
At power-on,
at RESET, at
STOP RUN
state
Error
code
Error name Error details and cause Stop/
continue
Action Detailed
information
Diagnostic
timing
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