Mitsubishi Electric MELSEC iQ-R Series User Manual page 593

Error Error name Error details and cause
code
3730H Redundant • Data communications with the
function module redundant function module has failed.
communication
error
3740H Redundant • The operation mode differs between
system error the systems A and B. (The error is
detected in the standby system.)
3741H Redundant • Both systems were set as system A or
system error system B at start-up.
• The CPU module waiting for a start-
up of the other system detected that
the system A/B setting is not set to the
CPU module of the other system.
3742H Redundant • The systems were started without
system error system A/B setting.
3743H Redundant • The system setting (system A or B)
system error was not determined.
3744H Redundant • Both systems are set as control
system error systems. (The error is detected in the
system B (control system).)
3745H Redundant • The systems were started with one
system error CPU module set to redundant mode
and the other CPU module set to
process mode.
• 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/ Action
continue
Stop • Check that there is no error in the
CPU module, base unit, or
redundant function module.
• Take measures to reduce noise.
• Reset the CPU module and run it
again. If the same error code is
displayed again, the possible
cause is a hardware failure of the
CPU module, redundant function
module, or base unit. Please
consult your local Mitsubishi
representative.
Stop • Restart the standby system CPU
module.
Stop • Set one system as system A and
the other system as system B by
performing online operation. Then,
restart the CPU modules in both
systems.
• Set system A or B to the CPU
module with no system setting,
and restart the CPU modules in
both systems.
• Restore the backup data including
the system A/B settings to set one
system as system A and the other
system as system B.
Stop • Set one system as system A and
the other system as system B by
performing online operation. Then,
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, redundant function
module, or tracking cable. Please
consult your local Mitsubishi
representative.
Stop • Set one system as system A and
the other system as system B by
performing online operation. Then,
restart the CPU modules in both
systems.
Stop • Restart the CPU module in the
system B.
Stop • When using the CPU modules
with firmware versions that cannot
be used together, replace either
CPU module with the one that can
be used together referring to the
MELSEC iQ-R Module
Configuration Manual. When
using the Process CPU and the
SIL2 Process CPU together,
replace either CPU module so that
the same CPU module models are
used in both systems. Then, write
a project to the CPU module in
process mode or to the one after
replacement and restart the CPU
modules in both systems.
Detailed Diagnostic
information timing
System Always
configuration
information

At power-on, at
RESET, at
tracking cable
connection

At power-on, at
RESET, at
tracking cable
connection
 At power-on, at
RESET

At power-on, at
RESET

At tracking
cable
connection

At power-on, at
RESET
36 ERROR CODES
591
36.4 List of Error Codes
36