Siemens CP 343-1 - Manual (Page 18)

5 Performance Data
B3L−18
CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
Release 03/2007
C79000-G8976-C198-04
5.3 Characteristics of the SEND/RECEIVE Interface
Table 5-3
Characteristic Explanation / Values
Number of ISO-on-TCP connections + TCP
connections + UDP connections in total
8 maximum
Notes:
S All UDP connections are also possible in the
multicast mode
S 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 between 1 and 240 bytes.
S 1 to 8192 bytes for ISO-on-TCP, TCP;
S 1 to 2048 bytes for UDP
Restrictions for UDP
S 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 blocks (AG_SEND).
S Data field length The maximum length of the data fields is 2048
bytes.
S No reception of UDP broadcast To avoid communication overload resulting from a
high broadcast load, the CP does not permit
reception of UDP broadcast.
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 (FC AG_SEND, FC AG_RECV) required for processing
on the S7−300 / C7−300 CPU is the decisive factor.
Table 5-4
Component Explanation / Values
Execution time on the CPU
315−2 DP
(6ES7 315−2EG10−0AB0)
per AG_SEND block call:
S <1 ms at <= 240 bytes
per AG_RECV block call:
S <1 ms at <= 240 bytes
Execution time on the CPU
317−2 PN/DP
(6ES7 317−2EJ10−0AB0)
per AG_SEND block call:
S <0.8 ms at <= 240 bytes
per AG_RECV block call:
S <0.8 ms at <= 240 bytes