Siemens SIMATIC NET S7-400 User Manual

Properties and services
1.3 Communication services
CP 443-1 (EX30)
Manual, 03/2019, C79000-G8976-C255-05
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1.3
Communication services
The CP supports the following communication services:
●
PROFINET IO controller
PROFINET IO allows direct access to PROFINET IO devices over Industrial Ethernet.
– Prioritized startup
The CP supports prioritized startup. Per PROFINET IO controller, a maximum of 32
PROFINET IO devices can be configured that support prioritized startup. Of these 32
IO devices, simultaneous startup times with values as low as 0.5 s can be achieved by
up to 8 IO devices.
– IRT communication (Isochronous Real Time) with IRT option "high performance"
IRT communication with the IRT option "high-performance" is possible with
PROFINET IO. The IRT option "high-performance" optimizes data traffic as the result
of topology planning.
Notes:
When using IRT communication nor media redundancy is supported.
IRT with the option "high flexibility" is now only supported when a CP EX20 is
replaced.
– Shared device
As a PROFINET IO controller, individual submodules of an IO device can be assigned
to the CP. Read the information in /16/ (Page 85) regarding configuration of
PROFINET IO systems and shared IO devices.
●
S7 communication with the following functions:
– PG functions
– Operator monitoring and control functions
– Data exchange over S7 connections
●
Open communication services with the following functions:
– SEND/RECEIVE interface over ISO transport connections
– SEND/RECEIVE interface over TCP connections, ISO-on-TCP and UDP connections
With the SEND/RECEIVE interface via TCP connections, the CP supports the socket
interface to TCP/IP available on practically every end system.
UDP frame buffering on the CP can be disabled during configuration. When
necessary, this allows you to achieve a shorter reaction time between the arrival of a
UDP frame and its evaluation on the CPU.
– Multicast over UDP connection
The multicast mode is made possible by selecting a suitable IP address when
configuring connections.
– FETCH/WRITE services (server services; corresponding to S5 protocol) via ISO
transport connections, ISO-on-TCP connections and TCP connections;
Here, the SIMATIC S7400 with the CP is always the server (passive connection
establishment) while the fetch or write access (client function with active connection

Siemens SIMATIC NET S7-400 Specifications

General

Brand	Siemens
Model	SIMATIC NET S7-400
Category	Conference System
Language	English