Mitsubishi Electric MELSEC iQ-R Series User Manual page 595

Error Error name Error details and cause
code
374BH Redundant • In a redundant system with redundant
system error extension base unit, data
communications with the other
system could not be performed at
start-up.
• In a redundant system with redundant
extension base unit, an error has
been detected in the extension base
unit.
(The error is detected in the standby
system.)
374CH Redundant • In a redundant system with redundant
system error extension base unit, the other system
did not respond during initial
communication at start-up.
• An error has occurred at start-up
since the startup procedure of the
redundant system with redundant
extension base unit was not followed.
(The error is detected in the standby
system.)
374DH Redundant • In a redundant system with redundant
system error extension base unit, the other system
has started while only the standby
system is operating.
• In a redundant system with redundant
extension base unit, an error has
been detected in the extension base
unit.
(The error is detected in the control
system.)
374EH Redundant • The systems have been started with a
system error configuration where CPU modules
which are set to process mode are
used with redundant extension base
units.
3750H Extension cable • Incorrect connections of the extension
failure cables have been detected in the
redundant extension base unit. (The
error is detected in the control
system.)
Stop/ Action
continue
Stop • 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.)
• If the other system CPU module is
powered off, restart the CPU
modules in both systems.
• 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.
Stop • Restart the system in which the
error has been detected.
• Check the startup procedure of
the redundant system with
redundant extension base unit,
and start up the system following
the procedure.
Stop • Restart the CPU modules in both
systems. If the same error code is
displayed again, the possible
cause is a hardware failure of the
CPU module, base unit, or
extension cable. Please consult
your local Mitsubishi
representative.
Stop • Set the CPU module to redundant
mode, and restart the system. Or,
remove the redundant extension
base units, 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.
Stop • Check the detailed information
(extension cable information) of
the error by executing module
diagnostics using the engineering
tool and identify the extension
cables incorrectly connected.
Connect the OUT1 connector to
the IN1 connector of the next
level, and connect the OUT2
connector to the IN2 connector of
the next level.
Detailed Diagnostic
information timing
 At power-on, at
RESET
 At power-on, at
RESET

At power-on, at
RESET
System At power-on, at
configuration RESET
information
Extension Always
cable
information
36 ERROR CODES
593
36.4 List of Error Codes
36