Siemens SIMATIC S7 400 Application Description page 61

Time switch based on the S7-300/400 CPUs with simple HMI system
including radio-controlled clock connection
Operating summer/winter time changeover
This user interface offers the possibility to define via a button whether the
changeover is to be performed program controlled, i.e. by FB 103
„summer_winter", or if the radio-controlled option is to be activated as you
use a radio receiver.
In this application case the radio-controlled option has been activated.
If you do not want to use a radio-controlled clock, switch to the mode
„Program controlled".
Fig. 6-7
Note
The same clocks can also be operated and monitored with the OP3 (LowCost-
range) or with an other HMI device. The TP170A is only given here as an example.
Rev. B - final 19.07.2002
User interface summer/winter time changeover
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