Data Throughput - Omron C200HW-PRM21 Operation Manuals

PROFIBUS-DP characteristics
Multi-peer communication

1-4-2 Data throughput

Transmission time
The configuration shows three active stations (masters) and six passive
stations (slaves). The three masters form a logical token ring. When an active
station receives the token telegram, it can perform its master role for a certain
period of time. During this time it can communicate with all assigned slave
stations in a master-slave communication relationship and a DPM2 master
can communicate with DPM1 master stations in a master-master
communication relationship.
In addition to logical peer-to-peer data transmission, PROFIBUS-DP provides
multi-peer communication (broadcast and multicast).
Broadcast communication:
Multicast communication:
At 12 Mbit/s PROFIBUS-DP requires only about 1 ms for the transmission of
512 bits of input data and 512 bits of output data distributed over 32 stations.
The figure below shows the typical PROFIBUS-DP transmission time
depending on number of stations and transmission speed. The data
throughput will decrease when more than one master is used.
an active station sends an unacknowledged
message to all other stations (master and
slaves).
an active station sends an unacknowledged
message to a predetermined group of stations
(master and slaves).
Section 1-4
5