Performance data
2.4 Characteristic data of the SEND/RECEIVE Interface
CP 343-1 Lean
Equipment Manual, 01/2023, C79000−G8976−C198−09
19
2.4 Characteristic data of the SEND/RECEIVE Interface
The SEND/RECEIVE interface provides access to communication over TCP, ISOonTCP and UDP
connections.
The following characteristics are important:
Table 2- 3 Characteristic data of the SEND/RECEIVE Interface
Number of ISO-on-TCP connections + TCP
connections + UDP connections in total
Notes:
• All UDP connections are also possible in
multicast mode.
• Free UDP connections are supported by the
CP.
Maximum data length for the blocks AG_SEND (as
of V4.0) and AG_RECV (as of V4.0)
AG_SEND and AG_RECV allow the transfer of
blocks of data with the following length:
• 1 to 8192 bytes for ISO-on-TCP, TCP;
• 1 to 2048 bytes for UDP.
• Transfer is not confirmed
The transmission of UDP frames is unconfirmed,
in other words the loss of messages is not
detected or displayed by the send block
• 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
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.
Measurements of transmission and reaction times in Ethernet, PROFIBUS and PROFINET
networks for a series of configurations can be found on the Internet at the following address:
Link: (http://support.automation.siemens.com/WW/view/en/25209605)
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