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12.7 Special Register List
12
TROUBLESHOOTING
(4) Scan information
Table12.24 Special register
Number Name Meaning Explanation
Set by
(When set)
Corresponding
CPU
SD520
Current scan
time
Current scan
time (in 1 ms
units)
• The current scan time is stored into SD520 and SD521.
(Measurement is made in 100 s units.)
SD520: Stores the value of ms. (Storage range: 0 to 6553)
SD521: Stores the value of s. (Storage range: 0 to 900)
(Example) When the current scan time is 23.6ms, the following
values are stored.
SD520 = 23
SD521 = 600
• The accuracy of processing time of scantime is 0.1ms.
S (Every END)
QS
SD521
Current scan
time (in 100 s
units)
SD524
Minimum
scan time
Minimum scan
time (in 1 ms
units)
• Stores the minimum value of the scan time into SD524 and
SD525. (Measurement is made in 100 s units.)
SD524: Stores the ms place. (Storage range: 0 to 6553)
SD525: Stores the s place. (Storage range: 0 to 900)
• The accuracy of processing time of scantime is 0.1ms.
S (Every END)
SD525
Minimum scan
time (in 100 s
units)
SD526
Maximum
scan time
Maximum scan
time (in 1 ms
units)
• Stores the maximum value of the scan time into SD526 and
SD527. (Measurement is made in 100 s units.)
SD526: Stores the ms place. (Storage range: 0 to 6553)
SD527: Stores the s place. (Storage range: 0 to 900)
• The accuracy of processing time of scantime is 0.1ms.
S (Every END)
SD527
Maximum scan
time (in 100 s
units)
SD540
END
processing
time
END
processing time
(in 1 ms units)
• Stores the time from when the scan program ends until the
next scan starts into SD540 and SD541.
(Measurement is made in 100 s units.)
SD540: Stores the ms place. (Storage range: 0 to 6553)
SD541: Stores the s place. (Storage range: 0 to 900)
• The accuracy of END processing time is 0.1ms.
S (Every END)
SD541
END
processing time
(in 100 s
units)
SD542
Constant
scan wait
time
Constant scan
wait time (in 1
ms units)
• Stores the wait time for constant scan setting into SD542 and
SD543.
(Measurement is made in 100 s units.)
SD542: Stores the ms place. (Storage range: 0 to 6553)
SD543: Stores the s place. (Storage range: 0 to 900)
• The accuracy of constant scan wait time is 0.1ms.
S (Every END)
SD543
Constant scan
wait time (in
100 s units)
SD548
Scan
program
execution
time
Scan program
execution time
(in 1 ms units)
• Stores the execution time of a scan program during one scan
into SD548 and SD549.
(Measurement is made in 100 s units.)
SD548: Stores the ms place. (Storage range: 0 to 6553)
SD549: Stores the s place. (Storage range: 0 to 900)
• Stored every scan.
• The accuracy of scan program execution time is 0.1ms.
S (Every END)
SD549
Scan program
execution time
(in 100 s
units)