Siemens OSM User Manual download pdf (Page 41)

Important OSM/ESM Functions

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Industrial Ethernet OSM/ESM Network Management

C79000-G8976-C137-08

2.17 Observer Function

The observer function provides further opportunities for error diagnostics and error

protection for redundant rings. It allows malfunctions of the redundancy manager

or bad configuration of a redundant ring to be monitored. The Observer is also

capable of opening the connected ring when the errors are detected (portection

mode). The function is optional and as default deactivated.

OSM in

Observer mode

OSM

OSM in

RM mode

Port 7 (Port 3 on OSM TP22 and ESM TP40)

Port 8 (Port 4 on OSM TP22 and ESM TP40)

Figure 2-3 Redundant Ring Structure with Monitoring of the RM by the Observer

When creating a ring with the Observer, remember the following:

S The second ring port of the redundancy manager (port 8 on 8-port

OSMs/ESMs, port 4 on 4-port OSMs/ESMs) must be connected with the first

ring port of the Observer (port 7 on 8-port OSMs/ESMs, port 3 on 4-port

OSMs/ESMs) (see Figure 2-3).

S The OSM/ESM acting as the observer must be switched to the observer mode

using the Command Line Interface (CLI), the command syntax for the observer

is explained in Chapter 3.

S The firmware version of both the observer and redundancy manager must be

V2.2 or higher.

2.17.1 Observer Error Messages

Observer error messages are signaled using the method (path) selected for alarm

events (Fault State Change - see Agent Event Configuration). These methods are

E-mail, trap and/or event log table entry. The message text is: “Observer detected

error”.

The status (see Table 2-2) is entered in the event log table and can also be

displayed in the CLI OSM menu with the ”Info” command. The display may be

delayed by several seconds.

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Siemens OSM User Manual Page 41