Characteristics Of S7 Communication; Send/Receive Interface; Characteristic Data - Siemens S7-400 Equipment Manual

Performance data

2.2 Characteristics of S7 communication

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