Rockwell Automation 2711 PanelView 550/900 Profibus Communications User Guide - Manual (Page 4)

PROFIBUS DP Communications 4
Publication 2711-6.3
The PROFIBUS DP network uses polled communication. The DP
Master sends information to and requests information from the DP
slave. This is a cyclical exchange of information which occurs
independent of the actual update of the databases by the DP Master
and DP slave application.
Before data exchange begins, each device on the network must have
a unique network address assigned to it. (See page 32 for
information on setting the PanelView terminal address.)
To exchange I/O data with the DP slaves on the network, the DP
Master must have parameter and configuration data for each DP
slave. This data contains information such as the slave’s bus
parameters and data exchange module configuration.
The illustration below shows an example network configuration.
PROFIBUS
Adapter
Expansion
Chassis
SLC Controller
Bus Termination
Bus Termination
DP Master
PanelView
Personal Computer
with PanelBuilder
Flex I/O Adapter
DP
RS-232
For more information
If you need more information, contact your local Allen-Bradley
integrator or sales office for assistance.
Communication Between
DP Masters and DP Slaves
PROFIBUS DP
Network Example