Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection
Rev. B - final 19.07.2002 24/84
Copyright © Siemens AG 2005 All rights reserved
BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
Serial No. Name Function description Technical data Ambient Conditions
5 Relative (FB124)
The FB “Relative” sets the output to “1”, if at the input “Enable” a
positive edge is identified. The output stays on “1” until the
parameterized time has elapse.
Additionally it can be parameterized, whether the parameterized time
restarts at any positive edge, or whether only the first edge change is
reacted to.
– Language STL
– Storage
requirements:
598 bytes
– Instance DB: DB124
58 bytes
– S7-CPU
– OB1
6 Summer_winter (FB103)
The FB “Summer_winter” changes the current system time in the S7-
CPU by plus or minus 1 hour, depending on whether the time
changeover has occurred from winter to summer or from summer to
winter time
– Language STL
– Storage
requirements:
382 bytes
– Instance DB: DB103
44 bytes
– S7-CPU
– OB1
7 Holidays (FC100)
The FC “Holidays” checks whether a date stored in this checked DB
coincides with the current system date in the S7-CPU and sets its
output to “1” accordingly.
– Language STL
– Storage
requirements:
310 bytes
– S7-CPU
– OB1
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