Siemens SIMATIC NET Instrucciones de operaciones descargar pdf (Pagina 130)

Active Components and Topologies

6-14

SIMATIC NET Tw isted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

Fast Redundancy in the Ring

By interconnecting the ends of a bus using OSMs/ESMs to form a ring, reliable

communication can be achieved. With an OSM/ESM in the ring, the integrated

redundancy manager is activated using a DIP switch. The redundancy manager

constantly monitors the operation of the network.

It recognizes the failure of a section in the ring or of an OSM/ESM and activates

the substitute path within a maximum of 0.3 seconds.

Redundant Linking of Networks

The standby function integrated in the OSM/ESM allows the redundant linking of

two networks (ring or bus). To achieve this, two OSMs/ESMs are set as the

standby master/slave using a DIP switch in each network and their standby ports

connected to the corresponding OSM/ESM in the other network.

Priority for Forwarding Time-of-Day Frames

OSMs/ESMs recognize a SIMATIC NET time-of-day frame by its multicast address

09000601FFEF

and forward it with priority over other frames. Giving priority to

time-of-day frames minimizes their propagation time in the network and keeps this

as low as possible regardless of the network load.

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Siemens SIMATIC NET Instrucciones de operaciones Pagina 130