Siemens S7-400 - Characteristics of S7 Communication; SEND;RECEIVE Interface; Characteristic Data

Performance data
2.2 Characteristics of S7 communication
CP 443-1 Advanced
22 Equipment Manual, 03/2023, C79000-G8976-C256-07
2.2 Characteristics of S7 communication
S7 communication provides data transfer via the ISO Transport or ISO-on-TCP protocols.
Characteristic
Explanation / values
Total number of S7 connections on Industrial
Ethernet
128 max.,
of those max. 62 H connections
LAN interface - data field length generated by CP
per protocol data unit
• sending
• receiving
480 bytes / PDU
480 bytes / PDU
• Number of PG connections
• Number of OP connections
2 max.
30 max.
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 the connection types
listed below. The following characteristics are important:
Characteristic
Explanation / values
Number of SEND/RECEIVE connections
• 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)
• E-mail connection: 1
• Max. number of connections (ISO-Transport + ISO-on-TCP + TCP + UDP
+ Email) total: 64
Refer to the example in the section General characteristic data (Page 21).
Number of SEND/RECV connections in SPEED
SEND/RECV mode
The number depends on the CPU type being used.
• Per CPU 412/414 maximum 30
• Per CPU 416/417 maximum 62