Mitsubishi Electric MELSEC iQ-R Series User Manual page 161

Online module change function
The following table lists the special register areas relating to the online module change function.
No. Name
SD1600 Module selection (base
unit No.)
SD1601 Module selection (slot
No.)
SD1602 I/O No. of the module
being changed online
SD1617 Online module change
progress status
SD1618 Online module change
error code
SD1619 Disable request error
code during online
module change
Description Details
Base unit No. where the The base unit number where the online change target module
online change target is mounted is specified.
module is mounted 0: Main base unit
1: 1st extension base unit

7: 7th extension base unit
FFFFH: Not specified (Default)
The value returns to its default (FFFFH) upon completion of
the online module change processing. When changing a
module directly, the system stores the corresponding base
unit number upon removal of the target module.
Slot No. where the online The slot number where the online change target module is
change target module is mounted is specified.
mounted 0: Slot No.0
1: Slot No.1

11: Slot No.11
FFFFH: Not specified (Default)
The value returns to its default (FFFFH) upon completion of
the online module change processing. When changing a
module directly, the system stores the corresponding slot
number upon removal of the target module.
I/O No. of the module This register stores the value of the I/O number of the module
being changed online being changed online divided by 16.
Other than FFFFH: I/O No.  16
FFFFH: Not specified (Default)
The value returns to its default (FFFFH) upon completion of
the online module change processing.
Online module change This resister stores the online module change progress
progress status status.
0: Normal operation
1: Module being selected
2: Module selected
3: Module removal requested
4: Module removal ready
5: Module removed
6: Module mounted
7: Module being recognized
8: Module recognized
9: Module control resumed
The value becomes 0 upon completion of the online module
change processing.
0: Normal operation The corresponding error code is stored when an error is
Other than 0: Error code detected during online module change. For the value stored,
refer to the list of error codes in the following manual.
•  MELSEC iQ-R CPU Module User's Manual
(Application)
This register is cleared to 0 when the error cause is eliminated
and the online module change related request is executed.
However, the error code needs to be cleared to 0 before
module selection since this register is not cleared to 0 if an
error occurs in selecting a module.
0: Normal operation The corresponding error code is stored when a disable
Other than 0: Error code request is executed during online module change. The error
code is cleared to 0 when the error cause is eliminated and
the online module change related request is executed.
For the value stored, refer to the list of error codes in the
following manual.
 MELSEC iQ-R CPU Module User's Manual (Application)
Set by (setting
timing)
S (Status change)/U
(Request)
S (Status change)/U
(Request)
S (Status change)
S (Status change)
S (Status change)/U
(Request)
S (Status change)
Appendix 4 List of Special Register (SD) Areas
A
APPX
159