Performance data / operation
5.4 Characteristics of the SEND/RECEIVE interface
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02
31
Characteristic Explanation / values
Number of TCP connections + UDP connections
in total
Maximum 8
Notes:
All UDP connections are also possible in
multicast mode.
Free UDP connections are supported by the
CP.
Max. data length for blocks AG_SEND (V4.0 and
higher) and AG_RECV (V4.0 and higher)
AG_SEND and AG_RECV allow the transfer of
data fields of a length:
1 to 8192 bytes for 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 reception of UDP broadcast
To avoid communication overload resulting from
a high broadcast load, the CP does not permit
reception of UDP broadcast.
UDP frame buffering
Size of the frame buffer with buffering enabled: 2
KB
Note:
Following a buffer overflow, newly arriving frames
are discarded.
Execution times of the FCs AG_SEND / AG_RECV
To calculate the CPU cycle times (OB1) with SEND/RECEIVE connections, the execution
time for the FCs (AG_SEND, AG_RECV) required for processing on the S7-300 / C7-300
CPU is the decisive factor.
Component Explanation / values
Execution time on the CPU 315-2 DP
(6ES7 315-2EG10-0AB0)
per AG_SEND block call:
<1 ms at <= 240 bytes
per AG_RECV block call:
<1 ms at <= 240 bytes
Execution time on the CPU 317-2
PN/DP
(6ES7 317-2EJ10-0AB0)
per AG_SEND block call:
<0.8 ms at <= 240 bytes
per AG_RECV block call:
<0.8 ms at <= 240 bytes
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