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5 connectivity devices, 1 dp/dp coupler – Siemens SIMATIC NET PROFIBUS User Manual

Page 46

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Topologies of SIMATIC NET PROFIBUS Networks

2-20

PROFIBUS Networks SIMATIC NET

6GK1970-5CA20-0AA1 Release 2 05/2000

2.5

Connectivity Devices

2.5.1

DP/DP Coupler

Uses

The PROFIBUS-DP/DP coupler is used to link two PROFIBUS-DP networks
together. Byte data (0 to 244 bytes) is transmitted from the DP master of a first
network to the DP master of another network and vice-versa.

This principle corresponds to the hardware wiring of inputs and outputs. The
coupler has two independent DP interfaces with which it attaches to the two DP
networks.

The DP/DP coupler is a slave attached to the DP networks. The data exchange
between the two DP networks involves internal copying within the coupler.

Figure 2-13

DP/DP Coupler