2-3
Section
Setting up a PROFIBUS-DP network
20
If the above measures are observed, electro-magnetic interference is diverted
through the cable’s shield.
You may find further information about
•
Commissioning of PROFIBUS-DP equipment
•
Testing the PROFIBUS-DP cable and bus connectors
•
Determining the loop resistance
•
Testing for correct bus termination
•
Determining the segment length and cable route
•
Other test methods
•
Example of an equipment report
in the PROFIBUS-DP guideline ”Installation Guideline for PROFIBUS-DP/FMS”
(PNO Order No- 2.112), which is available at every regional PROFIBUS-DP
User Organisation.
The maximum communication distance can be increased by the use of
repeaters. The repeater must be included in the count of the number of stations
per segment. Even though repeaters do not have a node address, they
represent an electrical load on the bus segment like any master or slave station.
If a repeater is located at the end of a bus segment, it should provide bus
termination as well.
It is recommended to limit the number of repeaters in series between any two
stations in the system to a maximum of three units, as shown in the following
example (3 repeaters are encountered in communication between section 6 and
sections 1, 2 and 4).
Example of a PROFIBUS system using repeaters
2-3-2 Configuring PROFIBUS-DP system
After making the physical connections of the network, the PROFIBUS-DP
system needs to be configured. For each master and its assigned slaves, a
configuration has to be defined using a dedicated configuration program.
Repeaters