APPX
Appendix 5 List of Special Register Areas
685
A
SD518 Initial scan time Initial scan time (unit: ms) • The initial scan time is stored into SD518 and SD519 (it is
measured in increments of 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)
SD519 Initial scan time (unit: s)
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)
SD521 Current scan time (unit: s)
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)
SD523 Minimum scan time (unit: s)
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)
SD525 Maximum scan time (unit: s)
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)
SD527 END processing time (unit:
s)
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.
•
I
n 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)
SD529 Constant scan wait time (unit:
s)
No. Name Data stored Details Set by (setting
timing)
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