PROFIBUS with STEP 7 V13
62
Function Manual, 12/2014, A5E03775446-AC
Functions
5
5.1
Isochronous mode
5.1.1
What is isochronous mode?
Why isochronous mode?
Assuming public transport were to operate at maximum speed while reducing stop times at
the passenger terminals to absolute minimum, the last thing many potential passengers
would notice of the departing contraption are its red tail lights. The overall travel time is,
however, decided by the train, bus or underground clock, because well adjusted timing is
essential to a good service. This also applies to distributed automation engineering. Not only
fast cycles but also the adaptation and synchronization of the individual cycles result in
optimum throughput.
Just-In-Time
Figure 5-1
System cycle
The high speed and reliable reaction time of a system operating in isochronous mode is
based on the fact that all data is provided just-in-time. The constant bus cycle time
PROFIBUS DP cycle beats the time here.
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