Parameter assignment/addressing
3.4 Cable configuration
PROFIBUS with STEP 7 V13
50 Function Manual, 12/2014, A5E03775446-AC
Adapting bus parameters in the optical ring
With the layout as ring, there is a kind of redundancy because you have the option to
address all devices using the ring structure even if the connection between two devices is
interrupted.
The following configuration conditions must be met in the optical ring:
● A free address below HSA (Highest Station Address)
● Increase of the retry value to at least 3
(Network settings: user-defined profile)
● Checking and adapting of the slot time
(Network settings: user-defined profile; bus parameters: Tslot parameter:
You need short slot time values for OLM / P12, medium slot time values for OLM / G12
and OLM / G12-EEC and high slot time values for OLM / G12-1300. This results in a high
performance for small networks and a medium to low performance with medium to large
networks.
Additional information on adaptation of the retry value and the slot time is available in the
PROFIBUS Network Manual
(http://support.automation.siemens.com/WW/view/en/35222591).
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