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Functions of the IM 151-7 CPU

8-39

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

Gateway

The gateway from one subnetwork to one or more other subnetworks lies in a

SIMATIC station that has interfaces to the respective subnetworks. Thus, in the

diagram below, the CPU 31xC-2 DP acts as a router between subnetwork 1 and

subnetwork 2.

Programming device

Subnetwork 1 (e.g. MPI

network)

S7 station

e.g. IM 151-7 CPU

with the DP master

module

as DP master

S7 station

ET 200S

DP slave

Subnetwork 2 (e.g.

PROFIBUS-DP

network)

Figure 8-8 Routing gateway

Prerequisites

 The modules of the station are “capable of routing” (CPUs or CPs).

 The network configuration does not extend beyond the project boundaries.

 The modules have loaded in them the configuration information that contains

the current “knowledge” on the entire network configuration of the project.

Reason: All modules that participate in the gateway must contain information on

which subnetworks can be reached along which routes (= routing information).

 The PD/PC with which you wish to establish a connection via a gateway must

be assigned in the network configuration to the network to which it is actually

physically connected.

 The CPU must be configured as a master.

 If the CPU is configured as a slave, the Commissioning/Test Mode functionality

must be activated in the DP interface properties for the DP slave in STEP 7.

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Siemens ET 7Y Series Spezifikationen Seite 151