Siemens SIMATIC NET Instrucciones de operaciones descargar pdf (Pagina 51)

Configuring Networks

3-25

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

3.4.2 ESM Bus Structure

100 Mbps Switched LAN with a Bus Structure

The Industrial Ethernet ESMs allow the implementation of 100 Mbps switched

LANs with a bus structure. The maximum distance between two ESMs must not

exceed 100 m. You can cascade the modules to form a bus using any TP port. Up

to a maximum of 50 ESMs can be cascaded.

ESM ESM ITP 80ESM ESM ITP 80

ESM

S7-400

S7-300

2 ITP XP Standard Cable 9/9

3 TP Cord 9/RJ45

4 ITP Standard Cable 9/15

Figure 3-8 Bus with ESMs

3.4.3 Redundant Ring Structure with ESMs

Redundant Electrical Ring

With the aid of an ESM functioning as the redundancy manager (RM), both ends of

an electrical bus made up of ESMs can be closed to form a redundant electrical

ring. The ESMs are connected together using ports 7 and 8. The RM monitors the

ESM bus connected to it, closes the bus if it detects an interruption and therefore

reestablishes a functioning bus configuration.

A maximum of 50 ESMs are permitted in an electrical ring. This allows a

reconfiguration time of less than 0.3 s to be achieved. The RM mode is activated

on the ESM using a DIP switch.

The maximum length of the twisted-pair cable between two ESMs is 100 m. This

means that an electrical ring including 50 ESMs can have a maximum span of 5

km.

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Siemens SIMATIC NET Instrucciones de operaciones Pagina 51