Siemens SIMATIC PCS 7 Function Manual

4.3.5.2 High availability fieldbus based on PROFINET
Functionality
The fieldbus is used for data communication between the automation system (AS) and the
distributed I/O. PROFINET is a standard for manufacturing and process automation. The
PROFINET-based fieldbus comprises the specifications for the following elements:
● Physical bus characteristics
● Access method
● User protocol
● User interface
PROFINET is suitable for fast, cyclic data communication with field devices.
High availability communication solutions
The following high availability communication solutions are offered for the PROFINET-based
fieldbus:
● Electrically designed network
● Optically designed network
Configurations
The S7-400H high availability automation system features a PROFINET interface on each
CPU 4xx-5H PN/DP for connecting to PROFINET. The high availability PROFINET connects
the CPU with the distributed I/O.
Note
High availability PROFINET
When using rings with PROFINET IO, it is absolutely necessary to operate the fieldbus ring
with MRP (media redundancy protocol) .
The following figure shows the connection of I/O based on PROFINET.
High availability solutions in PCS 7
4.3 Solutions for communication
High Availability Process Control Systems (V9.0)
78 Function Manual, 05/2017, A5E39221836-AA

Siemens SIMATIC PCS 7 Specifications

General

Brand	Siemens
Model	SIMATIC PCS 7
Category	Control Systems
Language	English