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Configuring Networks

3-31

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

3.6 Redundant Linking of Network Segments with OSMs/ESMs

Standby-Sync Port

The standby-sync port allows the connection of two Industrial Ethernet OSMs or

ESMs with one operating as standby master (DIP switch ”Stby off”) and the other

as standby slave (DIP switch ”Stby on”). With this mode, pairs of OSMs/ESMs can

be used for redundant coupling of OSM/ESM or OLM rings.

With network management, the OSM/ESM can also be configured so that several

rings or networks can be interconnected at the same time with two OSMs/ESMs

(see OSM/ESM Network Management, Manual /8/).

Synchronization Cable

The redundant connection between two network segments is on two separate

paths. The standby-sync ports of the two OSMs/ESMs used for the redundant link

are interconnected by a synchronization cable. The cable used for this is a TP-XP

Standard Cable 9/9 with a maximum length of 40 m. The two OSMs/ESMs inform

each other of their operating states via this synchronization cable. One of these

OSMs/ESMs is assigned the redundant function using the DIP switch setting ”Stby

on” (standby slave). The other OSM takes over the function of the standby master

(DIP switch setting ”Stby off”).

Immediately following the failure of the main transmission path, the standby slave

enables the redundant path. If the main path is OK again, the standby master

informs the standby slave. The main path is enabled and the redundant path

disabled again. The reconfiguration time of the redundant ring coupling is less than

0.3 s.

Port Assignment in the Standby Mode

On the standby master and standby slave, only port 1 (standby port) can be used

for the coupling to the neighboring ring. Ports 2 – 6 can be used just as normal

OSM ports.

The port assignment is the default setting of an OSM when shipped.

With network management, it is also possible to configure ports other than port 1

or several ports as standby ports (see also OSM/ESM Network Management

Manual /8/).

Simultaneous Standby and Redundancy Manager Operation

A standby master or standby slave can act as redundancy manager in a redundant

ring at the same time.

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