Using the Device as PROFINET Controller
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3.4.2 Setting the communication parameters (Send Clock, Reduction Ratio, Phase)
Send Clock (ms):
Send clock time in milliseconds
Reduction Ratio:
Scaling factor
The transmission interval results from the Send Clock × Reduction Ratio. Therefore, a Send Clock
of 1ms and a Reduction Ratio of 4 means that I/O data is sent every 4 ms.
Phase:
With a Reduction Ratio of n, the transmission interval is subdivided into phases 1 to n (where
transmission is in one phase only). The phase for transmission can be determined for the purpose
of load distribution.
With the settings "Send Clock" = 1 ms and "Reduction Ratio" = 4 the PROFINET Cycle Time (or Update
Time) is divided into four phases of 1 ms each. A PROFINET device with these settings is updated
every 4 ms. The PROFINET Update Time is thus the result of the multiplication of "Send Clock" and
"Reduction Ratio".
PROFINET Update Time = Send Clock × Reduction Ratio
The parameter "Phase" defines in which phase this PROFINET device is updated. In PROFINET net-
works with several devices the devices can be split to the different phases. This helps the master to
optimize the PN data transfer.
Fig. 25: PROFINET Update Time
Fig. 26: Settings for the PROFINET device
PROFINET Update Time
Reduction Ratio = Anzahl der Phasen
Send Clock
Phase 1 Phase 2 Phase 3 Phase 4
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