Characteristic Data Of The Send/Receive Interface - Siemens CP 343-1 Manual

Data lengths of the S7 services
Table 2- 3
S7 service
PUT / GET
USEND/URCV
BSEND/BRCV
Execution times for FBs for S7 connections
The execution time required to process the function blocks (FBs PUT, GET, USEND, URCV,
BSEND, BRCV) required on the S7-300 / C7-300 CPU is decisive for the calculation of the
CPU cycle times (OB1) for S7 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)
2.4

Characteristic data of the SEND/RECEIVE Interface

The SEND/RECEIVE interface provides access to communication over TCP, ISOonTCP,
ISO transport and UDP connections.
The following characteristics are important:
Table 2- 4
Characteristic
Number of ISO transport connections, ISO-on-
TCP connections + TCP connections + UDP
connections in total
Maximum data length for the blocks AG_SEND
(as of V4.0) and AG_RECV (as of V4.0)
Restrictions for UDP
CP 343-1
Manual, 12/2018, C79000−G8976−C201-08
Possible data lengths of the S7 services
Characteristic data of the SEND/RECEIVE interface
2.4 Characteristic data of the SEND/RECEIVE Interface
Maximum block length per frame
Explanation / values
16 maximum
Notes:
All UDP connections are also possible in
•
multicast mode.
Free UDP connections are supported by the
•
CP.
AG_SEND and AG_RECV allow the transfer of
blocks of data with the following lengths:
1 to 8192 bytes for ISO transport, ISO-on-
•
TCP, TCP
1 to 2048 bytes for UDP
•
Performance data
160 bytes
160 bytes
32 kB
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