MVI46-PDPS ♦ SLC Platform
Reference
Profibus DP Slave Communication Module
User Manual
ProSoft Technology, Inc.
Page 42 of 53
Communication Types
In addition to point-to-point data transfer, the PROFIBUS protocol can also handle the
following types of communication.
Broadcast communication: An active node sends an unacknowledged message to all
other nodes (Master and slaves)
Multicast communication (control instructions): An active node sends an
unacknowledged message to a group of nodes (Master and slaves)
Master/Slave Communication Phases
The communication between the Master and the slaves takes place in the following
phases:
Parameterization and configuration phase
Usable data transfer phase
Before a DP slave can be integrated into the usable data transfer phase, the
parameterization and configuration phase runs a device identification test that verifies
that the planned configuration matches the actual device configuration for each slave in
the PROFIBUS network. The test verifies that:
The device is actually there
It is the right type of device
The station address set on the device matches the station address in the bus
configuration
The formats, telegram length information, and bus parameters are correct
and
The number of configured inputs and outputs is correct
