Functions
5.6 PROFINET with performance upgrade
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
209
DFP groups
Dynamic frame packing automatically groups IO devices that support the performance
upgrade into DFP groups. To be grouped together in a DFP group. the IO devices must be
located one after the other in a line and must have the same update time and watchdog
time. As soon as a maximum frame size for the DFP group is exceeded or a maximum number
of members for a DFP group is reached, Dynamic Frame Packing automatically opens a new
DFP group.
STEP 7 shows the DFP groups in "Domain management" > "Sync domains" > "Name of the
sync domain" > "Device" in the "IO devices" box.
Figure 5-61 Display of the DFP groups in STEP 7
Note
Dynamic frame packing with high watchdog times
If you set the "Accepted update cycles without IO data" parameter higher than 31 for an
IO device, Dynamic Frame Packing does not place this IO device in a DFP group.
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