Mitsubishi Electric MELSEC iQ-R Series User Manual page 616

Error Error name
code
4240H Redundant system related
error
4241H Redundant system related
error
4243H Redundant system related
error
4244H Redundant system related
error
4246H Redundant system related
error
4247H Redundant system related
error
4248H Redundant system related
error
4249H Redundant system related
error
424AH Redundant system related
error
424BH Redundant system related
error
36 ERROR CODES
614
36.4 List of Error Codes
Error details and cause
Any of the following operations is requested to the
CPU module in the standby system, but cannot be
performed because they are not supported.
• Operation mode change
• System switching
• Memory copy from control system to standby
system
• Control system forced start-up while waiting for a
start-up of the other system
• External input/output forced on/off function
Data communications cannot be performed with the
other system because of any of the following
reasons:
• The CPU module of the other system is powered
off or in a reset state.
• The tracking communication stops due to an
error in the CPU module of the own or other
system.
• Tracking cables are disconnected or incorrectly
connected, or failed.
• The redundant function module of the own or
other system is being changed online, a module
communication test is being performed for the
module, a hardware failure has occurred in the
module, or the module is restarting.
• System A/B has not been determined in the CPU
modules.
• The request cannot be executed because a stop
error has occurred in the CPU module of the
standby system.
• The request cannot be executed because the
operating status of the CPU module in the control
system differs from that of the CPU module in the
standby system.
• The request cannot be executed because the
operation mode is being changed or the systems
are being switched.
• The request cannot be executed because the
memory copy function is being executed.
Data communications cannot be performed with the
system specified as a connection destination
(request destination module I/O number) because
of either of the following reasons:
• The request was issued during the system
switching processing.
• The system specified as a connection destination
(request destination module I/O number) does
not exist.
• The request cannot be executed because the
system setting (system A or B, control system or
standby system) has not been determined.
• The request cannot be executed because the
system A, system B, control system, or standby
system is set as a connection destination
(request destination module I/O number).
The request cannot be executed because system
switching is disabled because of either of the
following reasons:
• SM1646 (System switching by a user) is off.
• The DCONTSW instruction is being executed.
Action
• Perform these operations to the CPU module in the control
system.
• If a WDT error has occurred in the CPU module of the own or
other system, eliminate the error cause and then execute the
operation again.
• Set the own system as system A or B and the other system
as the other.
• Check that there is no error or failure in the CPU module,
tracking cables, redundant function modules, and perform a
retry. Or, perform a retry after the online module change
processing or the module communication test ends. 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.
• Check the stop error, eliminate the error cause, and then
execute the request again.
• Match the operating status of the CPU module between the
systems, and execute the request again.
• Execute the request again after the operation mode change
processing or the system switching processing ends.
Execute the request again after the memory copy processing
ends. The completion status can be checked in the following
special relay areas.
• SM1654 (Memory copy being executed): Off
• SM1655 (Memory copy completion): On
Check the following, and execute the request again.
• The system switching processing has completed.
• The redundant system has started up successfully.
• When the memory copy with the special relay and special
register is used, 03D1H (Standby system CPU module) is
stored in SD1653.
• Set one system as system A or control system and the other
system as system B or standby system, and execute the
request again. Or, do not specify any connection destination
system (request destination module I/O number), and
execute the request again.
• Do not specify any connection destination system (request
destination module I/O number), and execute the request
again.
Perform either of the following operations to enable system
switching, and execute the request again.
• Turn on SM1646 (System switching by a user).
• Execute the ECONTSW instruction.