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MELSEC-Q
11 TROUBLESHOOTING
Special Register List (Continued)
Number Name Meaning Explanation
Set by
(When
set)
Corresponding
ACPU
D9
Corresponding
CPU
SD651
SD652
SD653
SD654
SD655
SD656
Comment file
name
Comment file
name
• Stores the comment file name (with extension) selected at the
parameters or by the QCDSET instruction in ASCII code.
S
D651
S
D652
S
D653
S
D654
S
D655
S
D656
Second character
Fourth character
Sixth character
Eighth character
First character of extension
Third character of extension
First character
Third character
Fifth character
Seventh character
2E
H
(.)
Second character of
extension
B15
to
B8 B7
to
B0
S (Status
change)
New
SD660
Boot
designation
file drive
number
• Stores the drive number where the boot designation file (
.QBT) is
being stored.
S (Initial) New
SD661
SD662
SD663
SD664
SD665
SD666
Boot
operation
designation
file
File name of
boot
designation
file
• Stores the file name of the boot designation file (
.QBT).
S
D661
S
D662
S
D663
S
D664
S
D665
S
D666
Second character
Fourth character
Sixth character
Eighth character
First character of extension
Third character of extension
First character
Third character
Fifth character
Seventh character
2E
H
(.)
Second character of
extension
B15
to
B8 B7
to
B0
S (Initial) New
(6) Instruction-Related Registers
Number Name Meaning Explanation
Set by
(When
set)
Corresponding
ACPU
D9
Corresponding
CPU
SD705
SD706
Mask pattern Mask pattern
• During block operations, turning SM705 ON makes it possible to use
the mask pattern being stored at SD705 (or at SD705 and SD706 if
double words are being used) to operate on all data in the block with
the masked values.
U New
SD714
Number of
vacant
communicati
on request
registration
areas
0 to 32
• Stores the number of vacant blocks in the communications request
area for remote terminal modules connected to the AJ71PT32-S3.
S (During
execution)
D9081 QnA
SD715
SD716
SD717
IMASK
instruction
mask pattern
Mask pattern
• Patterns masked by use of the IMASK instruction are stored in the
following manner:
SD715
SD716
SD717
l15 l1 l0
l31
l47
l17
l33
l16
l32
B15 B0B1
to
to
to
S (During
execution)
New
SD718
SD719
Accumulator Accumulator • For use as replacement for accumulators used in A-series programs. S/U New
SD720
Program No.
designation
for PLOAD
instruction
Program No.
designation
for PLOAD
instruction
• Stores the program number of the program to be loaded by the
PLOAD instruction when designated.
• Designation range: 1 to 124
U New QCPU
SD730
No. of vacant
registration
area for CC-
Link
communicati
on request
0 to 32
• Stores the number of vacant registration area for the request for
communication with the intelligent device station connected to
A(1S)J61QBT61.
S (During
execution)
New QnA
SD736 PKEY input PKEY input
• Special register that temporarily stores keyboard data input by means
of the PKEY instruction.
S (During
execution)
New QnA