592
36 ERROR CODES
36.4 List of Error Codes
3746H Tracking
communications
disabled
• Data communications with the other
system could not be performed within
the period of time set in the CPU
parameters ("Other System Start-up
Timeout Setting").
Stop • If the other system CPU module is
powered off, restart the CPU
modules in both systems.
• If a WDT error has occurred in the
other system CPU module,
eliminate the error cause, and
restart the system.
• Connect tracking cables securely
and properly to the connectors of
the redundant function modules in
both systems, and restart the CPU
module(s) with the error. (One
cable shall be connected between
the IN connector of the module in
system A and the OUT connector
of the module in system B. The
other cable shall be connected
between the OUT connector of the
module in system A and the IN
connector of the module in system
B.)
• Set a longer time in the CPU
parameters ("Other System Start-
up Timeout Setting").
• Take measures to reduce noise. If
the same error code is displayed
again, the possible cause is a
hardware failure of the CPU
module, redundant function
module, base unit, or tracking
cable. Please consult your local
Mitsubishi representative.
At power-on, at
RESET
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.
• In a redundant system with redundant
extension base unit, the extension
cable is not connected between the
main base unit of one system and the
extension base unit. Or, the extension
base unit cannot be recognized by the
other system.
(The error is detected in the control
system or the standby system.)
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.
• Check the system configurations
of both systems and correct them.
• Connect the extension cable
securely and properly to the
connector of the redundant
extension base unit, and then
restart the CPU module in which
the error has been detected. If the
same error code is displayed
again, the possible cause is a
failure of the extension cable.
Replace the extension cable.
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
Error
code
Error name Error details and cause Stop/
continue
Action Detailed
information
Diagnostic
timing
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