Functions
5.6 PROFINET with performance upgrade
PROFINET with STEP 7
208
Function Manual, 05/2021, A5E03444486-AL
5.6.1
Dynamic frame packing
Dynamic frame packing
Previously, individual PROFINET IO frames were sent for every PROFINET IO device.
The performance upgrade uses the dynamic frame packing procedure that is based on the
summation frame method. With the summation frame method, a frame contains the user
data for neighboring devices on a line. With Dynamic Frame Packing, every IO device takes its
data from the frame and forwards the rest. The frame is shortened from IO device to IO
device. Dynamic frame packing improves the use of the bandwidth in a line topology.
The following figure shows how Dynamic Frame Packing works based on the example of a
frame containing the user data for 3 IO devices.
①
The PROFINET IO frame contains the user data for all 3 IO devices (green, blue and orange).
②
The PROFINET IO frame reaches the first IO device. The IO device takes its user data (green)
from the frame and forwards the remaining frame.
③
The PROFINET IO frame contains the user data for two IO devices (blue and orange).
④
The PROFINET IO frame reaches the second IO device. The IO device takes its user data (blue)
from the frame and forwards the remaining frame.
⑤
The PROFINET IO frame contains the user data for one IO device (orange).
⑥
The PROFINET IO frame reaches the last IO device. The IO device saves the entire frame includ-
ing user data (orange).
Figure 5-60 Dynamic Frame Packing (DFP)
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