Siemens SIMATIC NET PROFIBUS - Manual (Page 46)

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