Diagram 1: Assignment of measured output voltage to signal quality.
Notes:
In order to attain a valid reading, it is necessary for the
partner OZD Profi at the other end of the optical fiber
to send regular PROFIBUS frames. This can be seen on
the LED display of the partner OZD Profi (see 5, ”LED
Indicators and Troubleshooting“, p. 27).
The output voltage at the measuring sockets is subject to
many influencing factors, such as:
䡲 the strength of the transmitting power of the
partner OZD Profi
䡲 the ambient temperature of the optical sender
and receiver
䡲 attenuation of the transmitting link
䡲 the transfer rates being used
The measuring sockets are therefore not intended as a
substitute for a calibrated level measuring device with a
calibrated light source.
The readings taken should only serve to classify the
optical signal being received in the 3 classes
䡲 good (normal operation)
䡲 critical (reduced optical system reserves)
䡲 poor (function not guaranteed)
Measurements must be taken with a conventional
ungrounded and high-resistance voltmeter. A connection
to the OZD Profi 12M … housing is not permitted either
from the measuring sockets or the reference potential.
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