S
YSTEM
D
ESCRIPTION
: 6842 GPS S
LIM
L
INE
(1U)
6842 GPS Slim Line System - V09.01
13 / 98
hopf
Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
1.1.5 System Bus 6000
The System Bus, consisting of the Bus Board with VG ledges, via which the Control Board
6842 and the Function Boards are connected, can be found in the System 6842.
The System Bus serves to provide:
•
Distribution of the time information
•
Communication between Control Board 6842 and the Function Boards
•
Transmission of the regulated second pulse (PPS). This serves to synchronize the
data output of the implemented Function Boards
•
Distribution of the regulated DCF77 pulse (generated by the Control Board 6842)
•
Circular auto-reset circuit for ongoing verification of the System Bus Function Boards
to be found in the System
•
Power supply for the installed boards
Each active Function Board (transmit and receive) which is linked to the System Bus has a
SEND
LED. This LED signals which of the Function Boards is active on the System Bus.
Function Boards which only receive data from the System Bus do not have a
SEND
LED.
1.1.6 Function Board Slots
Up to two Function Boards can be implemented in the System 6842 GPS Slim Line (1U).
As a basic principle, the slot can be freely selected for each 'Function Board' / 'System Bus
Function Board'.
Exceptions of the slot selection can be found in
Chapter 6 Function Boards
Only boards that have been adapted for the 1U Slim Line System can be used in these slots.
Slots that have been prepared for special functions are identified with the letters
"A"
and
"B"
.
1.1.7 Temperature-controlled Forced Ventilation
The clock system has two temperature-controlled fans to prevent the operating temperature
rising above the allowed limit as a result of thermal coupling with equipment mounted in the
control panel.
These fans are mounted on the side ventilation apertures and switch in when the
temperature in the equipment reaches approx. 45°C.
The ventilation apertures on the left and right hand sides must not be
covered. Otherwise, active ventilation is ineffective and inadequate
convection and/or thermal coupling with surrounding equipment may cause
the temperature to rise above the equipment’s maximum permissible
operating temperature.
