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MELSEC-Q
11 TROUBLESHOOTING
Special Register List
(4) Scan information
Number Name Meaning Explanation
Set by
(When set)
Corresponding
ACPU
D9
Corresponding
CPU
SD500
Execution
program No.
Execution type of
program being
executed
• Program number of program currently being executed is
stored as BIN value.
S (Status
change)
New
SD510
Low speed
program No.
File name of low
speed execution in
progress
• Program number of low speed program currently being
executed is stored as BIN value.
• Enabled only when SM510 is ON.
S (Every
END
processing)
New
SD520
Current scan time
(ms unit)
S (Every
END
processing)
D9017 format
change
SD521
Current scan
time
Current scan time
(
µ
s unit)
• Current scan time is stored into SD520, SD521.
(Measurement is made in 100
µ
s increments.)
SD520: Place of ms is stored (storage range: 0 to 65535)
SD521: Place of
µ
s is stored (storage range: 0 to 900)
Example: Current scan time 23.6ms is stored as indicated
below.
SD520 = 23
SD521 = 600
S (Every
END
processing)
New
SD522
Initial scan time
(ms unit)
SD523
Initial scan
time
Initial scan time
(
µ
s unit)
• Scan time of initial execution program is stored into SD522,
SD523. (Measurement is made in 100
µ
s increments.)
SD522: Place of ms is stored (storage range: 0 to 65535)
SD523: Place of
µ
s is stored (storage range: 0 to 900)
S (First
END
processing)
New
SD524
Minimum scan time
(ms unit)
S (Every
END
processing)
D9018 format
change
SD525
Minimum scan
time
Minimum scan time
(
µ
s unit)
• Minimum value of scan time with the exception of initial
execution program scan time is stored into SD524, SD525.
(Measurement is made in 100
µ
s increments.)
SD524: Place of ms is stored (storage range: 0 to 65535)
SD525: Place of
µ
s is stored (storage range: 0 to 900)
S (Every
END
processing)
New
SD526
Maximum scan time
(ms unit)
D9019 format
change
SD527
Maximum scan
time
Maximum scan time
(
µ
s unit)
• Maximum value of scan time with the exception of initial
execution program scan time is stored into SD526, SD527.
(Measurement is made in 100
µ
s increments.)
SD526: Place of ms is stored (storage range: 0 to 65535)
SD527: Place of
µ
s is stored (storage range: 0 to 900)
S (Every
END
processing)
New
SD528
Current scan time
(ms unit)
SD529
Current scan
time
for low speed
execution type
programs
Current scan time
(
µ
s unit)
• Current scan time of low speed program is stored into
SD528, SD529. (Measurement is made in 100
µ
s
increments.)
SD528: Place of ms is stored (storage range: 0 to 65535)
SD529: Place of
µ
s is stored (storage range: 0 to 900)
S (Every
END
processing)
New
SD532
Minimum scan time
(ms unit)
SD533
Minimum scan
time for
low speed
execution type
programs
Minimum scan time
(
µ
s unit)
• Minimum value of low speed program scan time is stored
into SD532, SD533. (Measurement is made in 100
µ
s
increments.)
SD532: Place of ms is stored (storage range: 0 to 65535)
SD533: Place of
µ
s is stored (storage range: 0 to 900)
S (Every
END
processing)
New
SD534
Maximum scan time
(ms unit)
SD535
Maximum scan
time for
low speed
execution type
programs
Maximum scan time
(
µ
s unit)
• Maximum value of low speed program scan time with the
exception of the first scan is stored into SD534, SD535.
(Measurement is made in 100
µ
s increments.)
SD534: Place of ms is stored (storage range: 0 to 65535)
SD535: Place of
µ
s is stored (storage range: 0 to 900)
S (Every
END
processing)
New
SD540
END processing time
(ms unit)
SD541
END
processing
time
END processing time
(
µ
s unit)
• Time from scan program end until next scan start is stored
into SD540, SD541. (Measurement is made in 100
µ
s
increments.)
SD540: Place of ms is stored (storage range: 0 to 65535)
SD541: Place of
µ
s is stored (storage range: 0 to 900)
S (Every
END
processing)
New