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Fundamentals of PROFIBUS
Operation manual
5
5.3 Data transmission via PROFIBUS DP
5.3.1 Possible communication
Devices of the 5 th generation of STÖBER inverters support cyclic and acyclic
services with the DP-V1 option. This provides a wide variety of possible ways to
communicate:
C2 - Master
C2 - Master
C1 - Master
HMI
1
3
2
4
Fig. 5-2: Different communication options
1: Cyclic communication
2 - 4: Acyclic communication
Cyclic communication (1) is the simple exchange of user data via the data
exchange telegram. Time critical process data (PZD) are exchanged between a
class-1 master (C1) and the drive controller with cyclic communication. Such data
include, for example, reference and actual values, and control and status
information. A routine for parameter communication (of the familiar PKW channel
as with the FDS 4000) can be implemented within the cyclic communication.
There is always exactly one C1 master in each PROFIBUS setup. This master
reads the GSD file, configures the drives, starts PROFIBUS and runs the cyclic
communication. The C1 master is usually the controller (arrow 1).
The acyclic services (2-4) are available in DP-V1 for the transmission of new
parameter jobs for controlling and monitoring the drives, parallel to true cyclic
communication.
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ID 441687.03
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