Siemens CP 343-1 Lean User Manual

Performance data
2.4 Characteristic data of the SEND/RECEIVE Interface
CP 343-1 Lean
Manual, 10/2012, C79000−G8976−C198−07
17
Table 2- 3 Characteristic data of the SEND/RECEIVE Interface
Characteristic Explanation / values
Number of ISO-on-TCP connections + TCP
connections + UDP connections in total
8 maximum
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.
Restrictions 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
(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
are discarded.
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 in Ethernet, PROFIBUS and PROFINET
networks for a series of configurations can be found on the Internet at the following address:
25209605 (http://support.automation.siemens.
com/WW/view/en/25209605)

Siemens CP 343-1 Lean Specifications

General

Brand	Siemens
Model	CP 343-1 Lean
Category	Switch
Language	English