APPX
Appendix 5 List of Special Register Areas
851
A
SD500 Execution program
number
Execution program
number
The program number which is currently executed is stored as a BIN
value.
S (Status
change)
ALL
SD518 Initial scan time Initial scan time (unit:
ms)
• The initial scan time is stored into SD518 and SD519 (The time is
measured in microseconds (s).)
SD518: stores a value in the ms place (storage range: 0 to 65535)
SD519: stores a value in the s place (storage range: 0 to 999)
• These areas are cleared to 0 when the operating status of the
CPU module is switched from STOP to RUN.
S (Every END) ALL
SD519 Initial scan time (unit:
s)
ALL
SD520 Current scan time Current scan time
(unit: ms)
• The current scan time is stored into SD520 and SD521 (it is
measured in increments of s).
SD520: stores a value in the ms place (storage range: 0 to 65535)
SD521: stores a value in the s place (storage range: 0 to 999)
Example: If the current scan time is 23.6ms, the following values
are stored:
SD520 = 23
SD521 = 600
• These areas are cleared to 0 when the operating status of the
CPU module is switched from STOP to RUN.
• In a redundant system, when the operating status of the CPU
module is RUN state, these areas are cleared to 0 at the system
switching.
S (Every END) ALL
SD521 Current scan time
(unit: s)
ALL
SD522 Minimum scan time Minimum scan time
(unit: ms)
• The minimum value of the scan time other than one for the initial
execution program is stored into SD522 and SD523 (it is
measured in increments of s).
SD522: stores a value in the ms place (storage range: 0 to 65535)
SD523: stores a value in the s place (storage range: 0 to 999)
• These areas are cleared to 0 when the operating status of the
CPU module is switched from STOP to RUN.
• In a redundant system, when the operating status of the CPU
module is RUN state, these areas are cleared to 0 at the system
switching.
S (Every END) ALL
SD523 Minimum scan time
(unit: s)
ALL
SD524 Maximum scan time Maximum scan time
(unit: ms)
• The maximum value of the scan time other than one for the initial
execution program is stored into SD524 and SD525 (it is
measured in increments of s).
SD524: stores a value in the ms place (storage range: 0 to 65535)
SD525: stores a value in the s place (storage range: 0 to 999)
• These areas are cleared to 0 when the operating status of the
CPU module is switched from STOP to RUN.
• In a redundant system, when the operating status of the CPU
module is RUN state, these areas are cleared to 0 at the system
switching.
S (Every END) ALL
SD525 Maximum scan time
(unit: s)
ALL
SD526 END processing time END processing time
(unit: ms)
• The time period from completion of a scan program until start of
the next scan is stored into SD526 to SD527 (it is measured in
increments of s).
SD526: stores a value in the ms place (storage range: 0 to 65535)
SD527: stores a value in the
s place (storage range: 0 to 999)
•
These areas are cleared to 0 when the operating status of the
CPU module is switched from STOP to RUN.
• In a redundant system, when the operating status of the CPU
module is RUN state, these areas are cleared to 0 at the system
switching.
S (Every END) ALL
SD527 END processing time
(unit: s)
ALL
SD528 Constant scan wait
time
Constant scan wait
time (unit: ms)
• The waiting time specified in the constant scan setting process is
stored into SD528 and SD529 (it is measured in increments of
s).
SD528: stores a value in the ms place (storage range: 0 to 65535)
SD529: stores a value in the s place (storage range: 0 to 999)
• These areas are cleared to 0 when the operating status of the
CPU module is switched from STOP to RUN.
• In a redundant system, when the operating status of the CPU
module is RUN state, these areas are cleared to 0 at the system
switching.
S (Every END) ALL
SD529 Constant scan wait
time (unit: s)
ALL
No. Name Data stored Details Set by
(setting
timing)
CPU
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