● Sample calculation
– 15 x 30 ms = 450 ms, corresponds to the cyclic bus time
– reserved bus time for acyclic communication
1050 ms (recommended 70 %), 450 ms (recommended, at least 50 %)
– recommended macro cycle = between 1500 ms and 9000 ms
I/O data
The parameters, inputs and outputs of FF devices are distributed over function blocks. An FF
device can have several function blocks. Only configure the required I/O data of an FF device.
The number of processed function blocks has an effect on the macro cycle.
System planning
3.1 Nodes in the FOUNDATION Fieldbus
FOUNDATION Fieldbus
18 Commissioning Manual, 03/2013, A5E03880935-02
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