Performance data
2.3 SEND/RECEIVE interface
Note
Effects of connections in the SPEED SEND/RECV mode
Note the effects of connections on the SEND/RECEIVE interface that are used in the SPEED
SEND/RECEIVE mode.
The maximum configuration limits of S7 communication are reduced by each configured
connection using the SPEED SEND/RECV mode.
2.3
SEND/RECEIVE interface
2.3.1
Characteristic data
The SEND/RECEIVE interface provides access to communication over TCP, ISOonTCP, ISO
transport and UDP connections.
The following characteristics are important:
Characteristic
Number of SEND/RECEIVE connections
Number of SEND/RECV connections in SPEED
SEND/RECV mode
Maximum data length for AG_SEND and
AG_RECV program blocks
20
Explanation / values
•
TCP connections: 1...64
•
ISO-on-TCP connections: 1...64
•
ISO transport connections: 1...64
•
Total number of UDP connections (specified and free) that can be
configured: 1 to 64 (of those up to 48 in multicast mode)
•
Max. number of connections in total:
(ISO transport and ISOonTCP
+ TCP + UDP) <= 64
Refer to the example in section 5.1 (Page 19)
Notes:
•
Avoid overload at receiving end
1)
The flow control on TCP connections cannot control permanent
overload of the recipient. You should therefore make sure that the
processing capabilities of a receiving CP are not permanently exceeded
by the sender (approximately 150200 messages per second).
The number depends on the CPU type being used.
•
Per CPU 412/414 maximum 30
•
Per CPU 416/417 maximum 62
AG_SEND and AG_RECV were shipped with other CPs of the S7-400 family
and allowed the transfer of user data with a length of 1 to 240 bytes. The
version of the CP described here continues to support these program
blocks.
1)
Equipment Manual, 03/2022, C79000-G8976-C318-05
CP 442-1 RNA