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Number
Name
Installed Q
base
SD242
presence/
absence
SD243
No. of base
slots
(Operation
status)
SD244
SD245
No. of base
slots
(Mounting
status)
SD246
Loaded
SD250
maximum I/O
SD254
SD255
CC-Link IE
controller
SD256
network,
MELSECNET
/H information
SD257
SD258
SD290
SD291
SD292
Device
SD294
assignment
(Same as the
parameter
SD295
setting)
SD296
SD297
SD299
App-24
Appendix 3 SPECIAL REGISTER LIST
TableApp.3.4 Special register
Meaning
Base type
b15
differentiation
0: Base not
installed
1: QS**B is installed
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)
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).
Loaded maximum
• The upper 2 digits of the final I/O number plus 1 of the
I/O No.
modules loaded are stored as BIN values.
Number of
• Indicates the number of mounted CC-Link IE controller
modules mounted
network or MELSECNET/H modules.
• Indicates the I/O number of mounted CC-Link IE controller
I/O number
network or MELSECNET/H module.
• Indicates the network number of mounted CC-Link IE
Network number
controller network or MELSECNET/H module.
• Indicates the group number of mounted CC-Link IE controller
Group number
network or MELSECNET/H module.
• Indicates the station number of mounted CC-Link IE controller
Station number
network or MELSECNET/H module.
Number of points
• Stores the number of points currently set for X devices
assigned for X
Number of points
• Stores the number of points currently set for Y devices
assigned for Y
Number of points
• Stores the number of points currently set for M devices
assigned for M
Number of points
• Stores the number of points currently set for B devices
assigned for B
Number of points
• Stores the number of points currently set for F devices
assigned for F
Number of points
• Stores the number of points currently set for SB devices
assigned for SB
Number of points
• Stores the number of points currently set for V devices
assigned for V
Number of points
• Stores the number of points currently set for T devices
assigned for T
Explanation
to
b1
b0
Empty
Main base unit
b15
to
b4 b3 to b0
Empty
SD243
SD244
Empty
b15
to
b4 b3 to b0
Empty
SD245
SD246
Empty
Set by
(When set)
S (Initial)
Main
S (Initial)
Main
S (Initial)
S (Initial)
S (Initial)
S (Initial)
Corresponding
CPU
QS
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