Setting The Communication Parameters (Send Clock, Reduction Ratio, Phase) - turck CODESYS 3 Getting Started

Using the Device as PROFINET Controller
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.
Send Clock
Phase 1
Fig. 25: PROFINET Update Time
Fig. 26: Settings for the PROFINET device
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.
30
PROFINET Update Time
Phase 2 Phase 3
Reduction Ratio = Anzahl der Phasen
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Phase 4