5.2 Troubleshooting
37
5 Help with problems
Version 04 05/2014
5.2 Troubleshooting
5.2.1 Troubleshooting after signaling via
LED or signal contact
This chapter helps you to localize faults after they have
been indicated (by LEDs or signal contacts).
Please also refer to the description of the LED indicators
in 5.1, p. 35 and 5.2.2, p. 38.
Fault indicated on the system LED
See description of the LED indicators in 5.1, p. 35.
Fault indicated on CH1
Check the following:
䊳
the DIL switch S0 is in Position 1 if the OZD Profi
connected to the electrical star segment of a star
topology (see Chap. 3.3 ”Star topology“, p. 17).
䊳
the fault is still displayed after removal of the RS485
connector.
Still displayed: Device is defective*.
Replace the OZD Profi.
No longer displayed: The fault lies in the RS485 bus
segment.
Check
– all RS485 connectors as described in 4.7
”Connecting the optic bus cables“, p. 30
– the structure and shielding of the RS485 bus
segment
– the RS485 bus segment using a PROFIBUS bus
monitor
– the configuration of all bus subscribers.
* This is not the case if the monomaster of a PROFI-
BUS network is connected to the RS485 bus segment
which is to be examined. Replace the OZD Profi con-
cerned with another OZD Profi from the network, and
then carry out the test described above.
If the OZD Profi still malfunctions when connected
elsewhere, the device is defective. Replace the OZD
Profi.
If the OZD Profi does not malfunction elsewhere, the
fault lies in the RS485 bus segment.
Carry out the measures described above.
Fault indicated on CH2 / CH3
Check the following:
䊳
optically only repeaters of the same type are con -
nected together (see 3, ”Network topologies“, p. 13)
䊳
the optical channels, which are connected via optical
fibers, have been set to the same operating mode
(see 4.6, ”Setting compatibility, operating mode and
transmitting power“, p. 27)
䊳
the settings given in 4.7, ”Connecting the optic bus
cables “ (p. 30) have been observed when connecting
and laying the optical bus lines.