Siemens SICLOCK DCFRS 2XV9450-1AR21/2XV9450-1AR48 - Handbuch (Seite 12)

User Manual SICLOCK DCFRS Industrial Version
4 Version 1.0 Order No. 2XV9450-1AR48
1 Scope of Delivery
In the scope of delivery of SICLOCK DCFRS industrial version (Order No. 2XV9450-1AR21) the
following components are included:
• SICLOCK DCF77 antenna with TTY-Interface (order No. 2XV9450-1AR16 or E89700-B9204-A1)
• Antenna frame with 2 distribution boxes (1 distribution box included with the delivery of SICLOCK TM).
• Operating manual for die DCFRS industrial version (order No. 2XV9450-1AR48).
• TTY-RS232 converter with AC adapter (not for delivery together with SICLOCK TM in the complete packages
2XV9450-1AR26 and 27).
2 Commissioning
Commissioning a time synchronization with the DCFRS industrial version is carried out in the following
steps:
• Assembly of the antenna frame in accordance with the situation on site.
• Connection of the TTY-RS232 converter to the RS232 interface of the target system.
• Installation of the distribution boxes and AC adapter.
• Connection of the two distribution boxes by means of a cable laid on site.
• Installation of the appropriate reception service into the target system (not included under the scope of
delivery).
2.1 Description of Function
The SICLOCK DCFRS antenna serves the reception of the DCF77 time signal transmitter for the
transmission of the official time of day in the Federal Republic of Germany. The transmitter in
Mainflingen near Frankfurt transmits at minute intervals the current date and absolute time on the long
wave frequency 77.5 kHz. The low frequency means that buildings and landscape properties are
essentially not a hindrance for the time signal, insofar as it is not shielded by metal. Through the
transmission output of 27 kW, the time signal can be received in an interference free environment
throughout Central Europe. The antenna and all the reception electronics are integrated in the
antenna housing.
The TTY-RS232 converter is fed by an AC adapter or another 24V source of direct or alternating
voltage and provides the supply current for the SICLOCK DCFRS antenna. It changes the current
pulses of the antenna (TTY) into voltage signals for a RS232 interface. Power supply to the RS232
transmitter is via control leads of the RS232 interface. The converter brings about galvanic separation
of the antenna circuit of the RS232 interface with an isolation voltage of 500V. Figure 1 shows the
structure of the reception unit.
When using the complete packages SICLOCK TM with DCF (2XV9450-1AR26 or 27), the cable
coming from the antenna distribution box is directly connected to the input E1 (terminal bar X2/4 and
6 at SICLOCK TM) and the cable shield must be earthed on the earth bar in the cabinet instead
of the earth connection at the antenna distribution box.
RS232-
receiver RS232-
transmitter
V+
V-
V+
V-
yellow
green
brown
white
cable
shield
cable
shield
Earth
DCF77-antenna
with footstand
TTY-RS232-converter target system
distribution box
max. 1000m
20mA
RS232-interface antenna circuit
500V max. isolation
Fig. 1: Installation schema with cabling.