Time switch based on the S7-300/400 CPUs with simple HMI system
including radio-controlled clock connection
Rev. B - final 19.07.2002 48/84
Copyright © Siemens AG 2005 All rights reserved
BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
Optional: hardware configuration with radio clock
The SIPLUS DCF77 radio clock module is connected to the voltage supply
unit / the SM 321 by means of a shielded 4-wire cable as follows:
PS SM 321 SIPLUS DCF77
E 0.0 Sec
E 0.1 DCF Data
L+ 24Vdc
M Ground
You may, of course, connect the radio clock also via other digital
inputs than those described here. In this case you only have to adjust
the parameter settings for "SekTakt" and "Data" in OB1
correspondingly when calling FB77 "DCF77_FB".
Functions of the LEDs on the radio clock module type SIPLUS
DCF77:
green LED '24Vdc': voltage supply is active
inner red LED 'DCF data': data transfer to the automation system
outer red LED 'sec': pulses received from the atomic clock at 1-second
intervals
Important!
The SIPLUS DCF77 should be positioned so that the radio clock signal is not
shielded by building facades of metal or similar obstacles. The module itself must
be protected against interference frequency and should not be placed directly on a
metal surface.
Test proper signal reception at the place of installation by connecting the SIPLUS
DCF77 module to supply voltage. Proper reception of the radio signals is indicated
by the outer red LED which should be flashing at 1-second intervals. If the LED
does not react or if it flashes inconsistently, another installation location should be
found. Depending on the conditions of signal reception, clock setting normally
takes about 3 to 4 minutes; if an unfavorable location has been selected, it will take
some more time.
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