Performance data
2.5 PROFINET IO characteristic data
CP 343-1
20 Manual, 12/2018, C79000−G8976−C201-08
• Transfer is not confirmed
The transfer of UDP frames is unconfirmed, in
other words the loss of messages is not detected
or displayed by the send block (AG_SEND).
• No receipt of UDP broadcast
To avoid communications overload of the CP due
to high broadcast load, the CP does not allow
receipt of UDP broadcasts.
• UDP frame buffering
Size of the frame buffer with buffering enabled: 2
Kbytes
Note:
Following a buffer overflow, newly arriving frames
Execution times of the FCs AG_SEND / AG_RECV
The execution time required to process the FC blocks (AG_SEND, AG_RECV) required on
the S7-300 / C7-300 CPU is decisive for the calculation of the CPU cycle times (OB1) for
SEND/RECEIVE connections.
Note
Measurements of transmission and reaction times i
n Ethernet, PROFIBUS and PROFINET
networks for a series of configurations can be found on the Internet at the following address:
http://support.automation.siemens.com/WW/view/en/25209605)
PROFINET IO characteristic data
Possible modes with PROFINET IO
In PROFINET IO, the CP can operate as a PROFINET IO device or as a PROFINET IO
controller.
Configuration limits of the CP as a PROFINET IO controller
The CP supports the following maximum configuration as a PROFINET IO controller:
Table 2- 5 Configuration limits of the CP as a PROFINET IO controller
Number of operable PROFINET IO devices
Size of the input area over all PROFINET IO devices ***)
Size of the output area over all PROFINET IO devices 1024 bytes max.
Size of the IO data area per submodule of a module in an IO
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