Siemens CP 343-1 Characteristics of the SEND/RECEIVE Interface, Component Explanation / Values

5 Performance Data

5.3Characteristics of the SEND/RECEIVE Interface

Table 5-3

Characteristic	Explanation / Values
Number of ISO-on-TCP connections + TCP	8 maximum
connections + UDP connections in total	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	AG_SEND and AG_RECV allow the transfer of
higher) and AG_RECV (V4.0 and higher)	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	per AG_SEND block call:	per AG_RECV block call:
315−2 DP	S <1 ms at <= 240 bytes	S <1 ms at <= 240 bytes
(6ES7 315−2EG10−0AB0)
Execution time on the CPU	per AG_SEND block call:	per AG_RECV block call:
317−2 PN/DP	S <0.8 ms at <= 240 bytes	S <0.8 ms at <= 240 bytes
(6ES7 317−2EJ10−0AB0)

B3L−18	CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
	Release 03/2007

C79000-G8976-C198-04