Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 756

Error Error name
code
3747H Redundant
system error
3748H Redundant
system error
3749H Redundant
system error
3760H Control system
CPU module
error
3780H Redundant
system
configuration
error
3781H Redundant
system
configuration
error
3782H Redundant
system
configuration
error
3783H Redundant
system
configuration
error
3784H Redundant
system
configuration
error
APPX
754
Appendix 1 Error Codes
Error details and cause
• 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.
• 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.
• Both systems are set as control
systems.
(The error is detected in both
systems.)
• In backup mode, a stop error of
the control system CPU module
was detected. (The error is
detected in the standby system.)
• 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.
• Two or more redundant function
modules are mounted.
• An extension base unit is
connected.
• In redundant mode, nine or more
CC-Link IE Field Network modules
or CC-Link modules are mounted.
• The redundant function module is
not mounted next to the control
CPU set to redundant mode.
Stop/ Action
continue
Stop • Eliminate the error cause, and restart
the CPU modules in both systems.
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.
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.
Stop • Eliminate the error cause, and restart
the CPU modules in both systems.
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.
Stop • Mount only one redundant function
module.
Stop • Remove all extension base units.
Stop • Reduce the number of CC-Link IE Field
Network modules and CC-Link
modules to eight or less for each.
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.
Detailed Diagnostic
information timing
 At power-on,
at RESET

At power-on,
at RESET

At END
instruction
execution

Always
System At power-on,
configuration at RESET
information
System At power-on,
configuration at RESET
information
System At power-on,
configuration at RESET
information
System At power-on,
configuration at RESET
information

At power-on,
at RESET, at
STOP  RUN
state