Technical data

Network configuration
3.3 Frame transmission time
PROFIBUS Network Manual
58 System Manual, Edition 04/2009, C79000-G8976-C124-03
3.3 Frame transmission time
3.3.1 Overview
Dependency of the system reaction time
The system reaction time of a PROFIBUS network depends on the following:
● The type of system being used (single or multiple master system)
● The maximum reaction time of the individual nodes
● The amount of data to be transmitted
● The bus configuration (topology, cable lengths, active network components)
The setting of the bus parameters (configuration) to the particular PROFIBUS network using
configuration software such as COM PROFIBUS or STEP 7.
Using optical link modules, extremely large PROFIBUS networks can be created. These
allow the use of long optical fiber links and the cascading of large numbers of components.
Each time the data packet passes through an OLM there is a delay.
Due to the delays caused by cables and network components and the monitoring
mechanisms in the network components, the PROFIBUS network parameter "Slot Time"
must be adapted to the network span, the network topology and the transmission speed.