Warranty, Liability and Support
Time switch based on the S7-300/400 CPUs with simple HMI system
including radio-controlled clock connection
Rev. B - final 19.07.2002 15/84
Copyright © Siemens AG Fehler! Unbekannter Name für
Dokument-Eigenschaft. All rights reserved
BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
2.1 Functionality in the S7-CPU
The following blocks are available in the S7-CPU:
2.1.1 Absolute time switching functions
One-day time switch:
This block can detect a time range within 24 hours, e.g. 8 to 12 o‘clock.
These switch times are repeated daily.
12:00 a.m
11:59:59 p.m
8:00 a.m. 12:00 p.m.
Fig. 2-4 Time range one-day time switch
Seven-day time switch:
This block can detect a time range within 7 days, e.g. each Tuesday
from 8 o’clock p.m. to Friday 6 o‘clock a.m.. These switch times are
repeated on a weekly basis.
Note:
It is also possible to repeat a switch time daily from Monday to Friday.
Di, 8:00 p.m.
So 12:00 a.m. Sa 11:59:59 p.m.
Fr, 6:00 a.m.
Fig 2-5 Time range seven-day time switch
One-month time switch:
This block can detect a time range within 31 days, e.g. each month from
the 3
rd
, 12 o’clock p.m. to the 7
th
21 o‘clock p.m..
1
s
12:00 a.m.
31
s
11:59:59 p.m.
3
r
, 12:00 p.m. 7
th
, 9:00 p.m.
Fig 2-6 Time range one-month time switch
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