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Does the cycle time depend on the choice of addresses?

Does the cycle time depend on the choice of addresses?

denis55
denis55 / newcomer (3)
 

Answers

Top answer

No, the cycle time is independent, since the master always has a cyclic communication with the slaves.

over9k
over9k / expert (2327)
 

PROFIBUS and PROFINET have one of the fastest cycle times, often under 1 ms which is extremely stable making the communication Real-Time.

The address choice does NOT influence the cycle times because the master is cyclically communicating with all the slaves.

A PA coupler needs around 14.5 ms per slave so the cycle time can be calculated by the following formula:

N * (0.256 * Ibytes + 14.5) + 40 ms

Where N represents the number of PA instruments and Ibytes shows the number of bytes per each of the instruments.

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