S
YSTEM
I
NDICATORS
/ F
AULT
A
NALYSIS
/ T
ROUBLESHOOTING
6842 GPS Slim Line System - V09.01
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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]
Auto-Reset Logic Operating Principle
There is a watch-dog module on the Control Board 6842. An output signal transmitted from
the Control Board to the System bus must be fed back to this module; otherwise a cyclical
hardware-reset is triggered on the System bus.
This signal is forwarded from one Function Board to the next Function Board on the System
bus. The signal is fed back to the Control Board from the last board via a bus termination.
In the event that a fault (e.g. program malfunction) arises on a board or the auto-reset circuit
is broken (board was removed from the System), then the signal is no longer forwarded by
this board and the Control Board triggers a system-wide hardware-reset via the System bus.
After this all boards perform a defined program restart.
All boards with their own processor are actively integrated into the System’s auto-reset logic.
On boards without a processor the circulating signal is bridged and by this means the pulse
is forwarded directly to the next board.
7.1.6 Serial Output of Data Telegrams
Many serial data telegrams contain status information that also contains the synchronization
status of the System.
The status of the clock system can be ascertained in a connected System by means of this
status (see
Chapter 5.3 Data Strings
).
The recording of these data telegrams (e.g. via "hyper terminal“)
enables long-term analysis of the reception status.
7.2 Error Patterns
This Chapter describes various error patterns which enable the customer to make a
preliminary problem analysis. In addition they provide an indication about how to describe
the error when contacting
hopf
Support.
7.2.1 Complete Failure
Description
•
The power LEDs are off
•
"Power" error relay has tripped
•
Display not active
Cause / Problem Solution
•
Equipment is switched off
•
Power supply failure
•
Power supply unit defective
