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12.7 Special Register List
12
TROUBLESHOOTING
Table12.22 Special register
Number Name Meaning Explanation
Set by
(When set)
Corresponding
CPU
SD242
Installed Q
base
presence/
absence
Base type
differentiation
0: Base not
installed
1: QS**B is installed
S (Initial)
QS
SD243
No. of base
slots
(Operation
status)
No. of base slots
• As shown above, each area stores the number of slots being
installed.
(Number of set slots when parameter setting has been made)
S (Initial)
SD244
SD245
No. of base
slots
(Mounting
status)
No. of base slots
• As shown above, each area stores the numbers of module-
mounted slots of the base unit (actual number of slots of the
installed base unit).
S (Initial)
SD246
SD250
Loaded
maximum I/O
Loaded maximum
I/O No.
• The upper 2 digits of the final I/O number plus 1 of the
modules loaded are stored as BIN values.
S (Initial)
SD254
CC-Link IE
Controller
Network,
MELSECNET
/H information
Number of
modules mounted
• Indicates the number of mounted CC-Link IE Controller
Network or MELSECNET/H modules.
S (Initial)
SD255 I/O number
• Indicates the I/O number of mounted CC-Link IE Controller
Network or MELSECNET/H module.
SD256 Network number
• Indicates the network number of mounted CC-Link IE
Controller Network or MELSECNET/H module.
SD257 Group number
• Indicates the group number of mounted CC-Link IE Controller
Network or MELSECNET/H module.
SD258 Station number
• Indicates the station number of mounted CC-Link IE Controller
Network or MELSECNET/H module.
SD290
Device
assignment
(Same as the
parameter
setting)
Number of points
assigned for X
• Stores the number of points currently set for X devices
S (Initial)
SD291
Number of points
assigned for Y
• Stores the number of points currently set for Y devices
SD292
Number of points
assigned for M
• Stores the number of points currently set for M devices
SD294
Number of points
assigned for B
• Stores the number of points currently set for B devices
SD295
Number of points
assigned for F
• Stores the number of points currently set for F devices
SD296
Number of points
assigned for SB
• Stores the number of points currently set for SB devices
SD297
Number of points
assigned for V
• Stores the number of points currently set for V devices
SD299
Number of points
assigned for T
• Stores the number of points currently set for T devices
SD300
Number of points
assigned for ST
• Stores the number of points currently set for ST devices
SD301
Number of points
assigned for C
• Stores the number of points currently set for C devices
SD302
Number of points
assigned for D
• Stores the number of points currently set for D devices
SD303
Number of points
assigned for W
• Stores the number of points currently set for W devices
SD304
Number of points
assigned for SW
• Stores the number of points currently set for SW devices
b0
b1b15 to
Empty
Main base unit
SD243
SD244
b15 to b4 b3 to b0
Empty
Main
Empty
SD245
SD246
b15 to b4 b3 to b0
Empty
Main
Empty