Characteristics Of The Send/Receive Interface; B3L−18 - Siemens CP 343-1 User Manual

5 Performance Data
5.3

Characteristics of the SEND/RECEIVE Interface

Table 5-3
Characteristic
Number of ISO-on-TCP connections + TCP
connections + UDP connections in total
Max. data length for blocks AG_SEND (V4.0 and
higher) and AG_RECV (V4.0 and higher)
Restrictions for UDP
S
Transfer is not confirmed
S
Data field length
S
No 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
Execution time on the CPU
315−2 DP
(6ES7 315−2EG10−0AB0)
Execution time on the CPU
317−2 PN/DP
(6ES7 317−2EJ10−0AB0)
B3L−18
Explanation / Values
8 maximum
Notes:
S
All UDP connections are also possible in the
multicast mode
S
Free UDP connections are supported by the
CP.
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
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).
The maximum length of the data fields is 2048
bytes.
To avoid communication overload resulting from a
high broadcast load, the CP does not permit
reception of UDP broadcast.
Explanation / Values
per AG_SEND block call:
S
<1 ms at <= 240 bytes
per AG_SEND block call:
S
<0.8 ms at <= 240 bytes
CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
per AG_RECV block call:
S
<1 ms at <= 240 bytes
per AG_RECV block call:
S
<0.8 ms at <= 240 bytes
Release 03/2007
C79000-G8976-C198-04