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Design, How the dp/dp coupler works, Parameter assignment – Siemens SIMATIC NET PROFIBUS User Manual

Page 47

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Topologies of SIMATIC NET PROFIBUS Networks

2-21

PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000

Design

The DP/DP coupler is installed in a compact, 40 mm wide casing.

The module can be installed (vertically when possible) on a standard rail with no
gaps being necessary.

The coupler is attached to each PROFIBUS-DP network via an integrated 9-pin
sub-D connector.

Master
S7-400

Master OP 25

Master
PG/PC/OP

Slave
ET 200M

Slave
ET 200M

DP/DP COUPLER

SIEMENS

Master
S7-300

А

А

А

А

Terminating resistor activated

À

2

2

2

2

2

2

2 LAN cable for PROFIBUS

Figure 2-14

Configuration Example of the DP/DP Coupler

How the DP/DP Coupler Works

The DP/DP coupler permanently copies output data of one network to the input
data of the other network (and vice-versa).

Parameter Assignment

The PROFIBUS-DP addresses are set using two DIP switches on the top of the
device. The configuration is set using the GSD file and the configuration tool of the
attached PROFIBUS-DP master. The data length is set with the relevant
configuration tool.