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 16/84
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BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
One-year time switch
This block can detect a time range within 365 days, e.g. from April 13
th
8 o’clock a.m. to September 28
th
12 o‘clock p.m..
1
s
Jan.
12
m
31
s
Dec.
11:59:59 p.m.
13
t
May, 8:00 28
t
Sept, 12:00
Fig 2-7 Time range one-year time switch
2.1.2 Relative time function
Relative time switch:
The clock is activated on a start signal and remains active until the
parameterized time interval has elapsed.
Start signal
Parameterized time
(e.g.: 3 hours)
Fig. 2-8 Relative time switch
2.1.3 Additional functions
• Summer/wintertime changeover:
The clock changes the absolute system time in the S7-CPU by plus or
minus one hour, depending on whether the time changeover is from
winter to summer time, or from summer to winter time.
For this changeover there are two alternatives:
1. Radio-controlled changeover (for this alternative you have to use the
radio-controlled clock shown in figure 2-1):
The system time is being synchronized after the clock connected to
the system has sent the changeover signal.
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