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APPX
Appendix 1 Error Codes
■Error codes related to the online module change function
The following table lists the codes of errors related to the online module change function.
The code of an error detected during online module change is stored in SD1618 (Online module change error code).
The code of an error when a disable request is executed during online module change is stored in SD1619 (Disable request
error code during online module change).
Error
code
Error name Error details and cause Action
4110H Online module
change error
The online module change function was executed while the
CPU module was in a error state (stop error).
The module cannot be changed online. Power off the
programmable controller, and replace the module.
4111H In a multiple CPU system, the online module change function
was executed even though other CPU modules have not
started up.
Execute the function again after all the CPU modules in the
system start up.
4202H • An attempt was made to change two modules directly at the
same time.
• A module that is not ready to be removed was removed.
• Continue processing for the module being changed online.
Two modules cannot be changed online at the same time.
For the other module, power off the programmable
controller, and replace the module.
• Turn on SM1602 (Module removal request flag) and check
that the value, 5, is stored in SD1617 (Online module
change progress status). Then, continue processing from
the step for mounting a module.
4205H The online module change function was executed in a multiple
CPU system where a CPU module that does not support this
function is included.
The module cannot be changed online. Power off the
programmable controller, and replace the module.
4206H An attempt was made to change the inter-module
synchronization target module online.
The module cannot be changed online. Power off the
programmable controller, and replace the module.
4210H The selected module is out of the valid range. Check and correct the target base unit number and/or slot
number, and turn on SM1600 (Module selection request flag)
again.
4214H The model of the newly-mounted module differs from that of
the module before online change. Or, the newly-mounted
module is not upward compatible (module mismatch).
Mount the same model or the upward compatible module, and
execute the request again.
• Mount a module of the same model, and perform the module
recognition processing again.
4215H • The module recognition processing is performed without the
module being mounted.
• The module selection processing is performed to the slot
that is set as "Empty".
• The module newly-mounted to the system is not mounted
correctly.
• Mount a module, and perform the module recognition
processing again.
• Check and correct the target base unit number and/or slot
number, and turn on SM1600 (Module selection request
flag) again.
• Mount the module correctly.
4216H The module newly-mounted to the system online has failed.
(The CPU module cannot access to the module.)
• The module has failed.
• The module is not mounted correctly.
Use another module, and execute the request again. Or,
power off the system, and replace the module with the one that
supports the online module change function.
• Replace the module with the normal one.
• Mount the module correctly.
4218H • The online change target module (before change) does not
support the online module change function.
• The module newly-mounted to the system online (after
change) does not support the online module change
function.
• The online module change function was executed to change
the MELSEC-Q series module.
• If an error occurs at the stage of selecting a module, the
module cannot be changed online. Power off the
programmable controller, and replace the module.
• If an error occurs at the stage of recognizing a module,
replace the module with the one that supports the online
module change function, and continue the processing.
• The module cannot be changed online. Power off the
programmable controller, and replace the module.
421AH The online module change function was executed to change a
module controlled by another CPU module.
Execute the function from the control CPU module.
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