Fault-Tolerant Fieldbus Based On Profinet - Siemens SIMATIC PCS 7 Function Manual

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
3.3.5.2

Fault-tolerant 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. It is used to
connect distributed I/O with very fast response times.
Fault-tolerant communication solutions
The following fault-tolerant communication solutions are offered for the PROFINET-based
fieldbus:
● Electrically designed network
● Optically designed network
Configurations
The S7-400H fault-tolerant automation system features a PROFINET interface on each CPU
4xx--5H PN/DP for connecting to PROFINET. The fault-tolerant PROFINET connects the CPU
with the distributed I/O.
The following figure shows the connection of I/O based on PROFINET.
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Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02