Siemens OSM User Manual Page 125

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  • TROUBLESHOOTING
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Notes on Troubleshooting
7-2
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
Table 7-1 below lists remedies if you encounter problems on the OSM/ESM.
Table 7-1 Troubleshooting
No.
Problem Possible Cause Remedy
1 LED L1 and L2 OFF No power supply Check the 24 V power supply.
2 LED Fault ON OSM/ESM startup after
turning on the power
supply.
The fault mask does not
match up with the current
status of the power supplies
or the port assignment.
None
Fault LED goes off following startup if
there is no further problem.
Check the power supplies and port
assignment, if necessary update the fault
mask, see /1/.
In the RM mode also:
Connection to a ring port
interrupted.
Check the connections to the ring ports
(port 3 and 4 on 4-port devices and port 7
and 8 on 8-port devices).
Two RMs in ring
simultaneously.
Turn off one RM.
Redundant coupling, also:
Short-circuited or break on
ITP XP standard cable 9/9.
Check the connecting cable between the
standby-sync ports of the two
OSMs/ESMs.
Both OSMs/ESMs of the
redundant ring coupling are
set as master or both as
slave.
Link down on a standby
port (only when standby
cable plugged in).
Switch one of the devices to the master
mode (Stby off), the other device to the
slave mode (Stby on).
Check the connection to the standby
ports.
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