Siemens SIMATIC ET 200AL, System Manual

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Parameter assignment/addressing
3.5 Additional network stations
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
51
3.5 Additional network stations
Communication load - considering additional network stations
The bus parameters depend on the communication volume of the active network stations.
There are differences between cyclical communication (DP) and connection-oriented,
acyclical communication (S7 communication, Send/Receive (FDL)). Contrary to DP, the
number and size of the communication jobs (communication load) depends on the user
program. This means the communication load cannot always be determined automatically.
If you select the check box "Consider the following network stations", you can consider
network stations in the calculation of the bus times that were not configured in the project.
Figure 3-5 Additional network stations
Calculating the bus times
You can specify a network configuration in the parameter group "Additional network stations"
for calculation of the bus times that deviates from the configured network configuration.
The network configuration is available for the following profiles:
●
Standard
● Universal (DP/FMS)
● User-defined