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Installation OZD Profi 12M ...
Release
01
07/2017
10.2 Systematic troubleshooting
This chapter helps you to localize an error systematically with the help of the
following questions.
See also the description of the LED displays. See “Display elements” on
page 20.
Check the following points:
Are all the electrical bus lines terminated at both ends in accordance with
PROFIBUS specification (even for short electrical lines)?
Are the lengths of the optical cables within the threshold values specified
in this manual?
See “Technical data” on page 57.
Is the reception level of the optical ports within the permissible range?
Are the DIP switches set according to the topology, mode of operation,
compatibility and optical transmission power?
See “Setting the operating mode and transmitting power” on page 43.
See “Setting compatibility” on page 40.
Were the following points taken into account regarding topology:
Line topology
Line topology selected and set according to the specifications in chapter
“Line topology” with or without F/O link monitoring.
See “Line topology” on page 25.
Star topology
CH1 must be switched to “Monitor off” mode (S0=1) for all OZD Profi 12M
… connected to the electrical star segment.
Wiring of the electrical star segment must be undertaken with care.
Expansion of the electrical star segment is to be as small as possible.
The electrical star segment must be terminated at both ends.
No bus subscribers are to be connected to the electrical star segment.
Non-busy optical ports are to be switched to “Line without F/O link
monitoring” operating mode.
Redundant optical ring
Both ports of all the OZD Profi 12M … must be set to “Redundant optical
ring” operating mode.
All the OZD Profi 12M … within a ring must be optically linked with one
another.
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