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Appendix 4 SPECIAL REGISTER LIST
*9: Function version is B or later.
TableApp.4.4 Special register
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
D9
Corresponding
CPU
SD242
A/Q base
differentiation
Base type
differentiation
0: QA**B is
installed
(A mode)
1: Q**B is installed
(Q mode)
S (Initial) New
Qn(H)
QnPH
QnPRH
Installed Q base
presence/
absence
Base type
differentiation
0: Base not
installed
1: Q**B is installed
S (Initial) New Q00J/Q00/Q01
Installed Q base
presence/
absence
Base type
differentiation
0: Base not
installed
1: Q**B is installed
• The bits from the third extension stage to the seventh extension stage
are fixed to "0" in the Q00UJCPU.
• The bits from the fifth extension stage to the seventh extension stage are
fixed to "0" in the Q00UCPU, Q01UCPU, and Q02UCPU.
S (Initial) New QnU
SD243
No. of base
slots
No. of base slots
• As shown above, each area stores the number of slots being installed.
• The bits from the third extension stage to the seventh extension stage
are fixed to "0" in the Q00UJCPU.
• The bits from the fifth extension stage to the seventh extension stage are
fixed to "0" in the Q00UCPU, Q01UCPU, and Q02UCPU.
S (Initial) New
Qn(H)
QnPH
QnPRH
QnU
SD244
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)
New
Q00J/Q00/Q01
SD244
SD245
No. of base
slots (Mounting
status)
No. of base slots
• As shown above, each area stores the number of module-mounted slots
of the base unit (actual number of slots of the installed base unit).
S (Initial)
Q00J/Q00/Q01
*9
SD246
SD250
Loaded
maximum I/O
Loaded maximum
I/O No.
• When SM250 goes from OFF to ON, the upper 2 digits of the final I/O
number plus 1 of the modules loaded are stored as BIN values.
S (Request
END)
New
Qn(H)
QnPH
QnPRH
• The upper 2 digits of the final I/O number plus 1 of the modules loaded
are stored as BIN values.
S (Initial) New
Q00J/Q00/Q01
QnU
b0b1b2b7
to
Fixed to 0
Main base unit
1st extension
base
2nd extension
base
to
7th extension
base
Fixed to 0
when the
base is not
installed.
b0b1b2b4
Fix
ed to 0
Main base unit
1st extension base
2nd extension base
4th extension base
to
to
b0b1b2b7
to
Fixed to 0
Main base unit
1st extension
base
2nd extension
base
to
7th extension
base
Fixed to 0
when the
base is not
installed.
SD243
SD244
b15 to b12b11 to b8 b7 to b4 b3 to b0
Extension
3
Extension
2
Main
Extension
1
Extension
7
Extension
6
Extension
4
Extension
5
SD243
SD244
b15 to b12 b11 to b8 b7 to b4 b3 to b0
Extension
3
Extension
2
Main
Extension
1
Fixed to
0
Fixed to
0
Extension
4
Fixed to
0
SD245
SD246
b15 to b12 b11 to b8 b7 to b4 b3 to b0
Extension
3
Extension
2
Main
Extension
1
Fixed to
0
Fixed to
0
Extension
4
Fixed to
0