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MELSEC-Q
APPENDICES
Special Register List (Continued)
Number Name Meaning Explanation
Set by
(When set)
Corresponding
ACPU
D9
Corresponding
CPU
SD240 Base mode
0: Automatic mode
1: Detail mode
• This register stores the base mode. S (Initial) New
Qn(H)
QnPH
QnPRH
Rem
SD241
Extension
stage number
0: Main base only
1 to 7: Number of
extension
base units
• This register stores the number of extension base units installed. S (Initial) New
SD242
A/Q base
differentiation
Base type
differentiation
0: QA
B is
installed
(A mode)
1: Q
B is
installed
(Q mode)
B0
Fixed to 0
Basic base module
B1
B2
B7
1st extension
base
to
2nd extension
base
7th extension
base
to
Fixed to 0 when the
base is not installed.
S (Initial) New
Installed Q
base
presence/
absence
Base type
differentiation
0: Base not
installed
1: Q**B is installed
B0
Fixed to 0
Basic base module
B1B2B7
1st extension
base
to
2nd extension
base
4th extension
base
to
S (Initial) New Q00J/Q00/Q01
Installed Q
Base
presence/
absence
Base type
differentiation
0: Base not
installed
1: Q**B is installed
B0
Fixed to 0
Basic base module
B1B2B7
1st extension
base
to
2nd extension
base
7th extension
base
to
Fixed to 0 when the
base is not installed.
S (Initial) New QnU
SD243
No. of base
slots
No. of base slots
SD243
Extension 3 Extension 2 Extension 1 Main
Extension 7 Extension 6 Extension 5 Extension 4
SD244
B15 B12 B11 B8 B7 B4 B3 B0
• The number of slots used is stored in the area corresponding to
each base unit as shown above.
S (Initial) New
Qn(H)
QnPH
QnPRH
QnU
Rem
SD244
SD250
Loaded
maximum I/O
Loaded maximum
I/O No.
• When SM250 is turned on, the first two digits of the number, which
are the last I/O number of the mounted modules plus 1, are stored
in binary format.
S
(Request
END)
New
Qn(H)
QnPH
QnPRH
Rem
• The first two digits of the number, which are the last I/O number of
the mounted modules plus 1, are stored in binary format.
S (Initial) New
Q00J/
Q00/Q01
QnU
Rem