Time switch based on the S7-300/400 CPUs with simple HMI system
including radio-controlled clock connection
Rev. B - final 19.07.2002 40/84
Copyright © Siemens AG 2005 All rights reserved
BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
Fig. 4-12 Configuration „DCF77_FB“
Basic data:
RAM requirements:
DCF77_FB: 2960 bytes
Instance DB: 58 bytes
Holiday recognition
The block checks a DB with 30 memory slots for holidays or special days,
and sets the output to “1”, if the current day of the system time of the S7-
CPU coincides with a data in this DB.
The block has the following input parameter:
• DB_Nr of “INT“ tpye:
contains the number of the DB in which holidays and special days are
stored
Fig. 4-13 Layout of the DB to be checked
The block has the following output parameters:
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