Siemens SIMATIC ET 200AL, System Manual

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Parameter assignment/addressing
3.6 Bus parameters
PROFIBUS with STEP 7 V13
52
Function Manual, 12/2014, A5E03775446-AC
Quantification of the communication load
The following settings are possible to take the communication load into consideration:
●
Number of network stations that are not configured
● Information on the communication load from the user programs for FDL or S7
communication. You can choose from the following levels:
–
Low: Typical for DP, no larger data communication except DP.
– Medium: Typical for mixed operation of DP and other communication services
(e.g., S7 communication), if DP has high time requirements and with medium,
acyclical communication volume.
– High: For mixed operation of DP and other communication services
(e.g., S7 communication), if DP has low time requirements and with high, acyclical
communication volume.
3.6 Bus parameters
Introduction
Bus parameters control the transmission behavior on the bus. Each device on the bus must
correspond with the bus parameters of other devices.
Note
The PROFIBUS subnet will only work properly if the parameters for the bus profile have
been synchronized. Change the preset values only if you are familiar with the parameter
assignment of the bus profile for PROFIBUS.