Siemens SIMATIC PCS 7 Function Manual page 38

Fault-tolerant Solutions in PCS 7
3.2 Solutions for automation systems
Transmission medium
The suitable physical transmission medium depends on the range, resistance to interference
and the transmission rate.
● Industrial Ethernet using fiber-optic cables or triaxial or twisted-pair copper lines can be
● PROFIBUS DP with electrical or optical components is used for communication from the
The transmission media and communication processors can be configured redundantly. If the
active communication component (CP, bus) fails, the communication automatically continues
through the redundant connection.
Only Industrial Ethernet with ISO protocol can be used as the plant bus for a fault-tolerant
system. The communication modules must also support the ISO protocol.
Equipping the rack
The hardware setup in the automation system and the configuration in HW Config must match:
● Rack (9 or 18 slots for redundant and, in some cases, remote configuration)
● Power supply modules (in some cases redundant configuration)
● H CPU with sync modules in slots "IF1" and "IF2"
● Communications processors (CP 443-1, CP 443-5 Extended)
Configuration
A pre-existing network can be used for fault-tolerant communication between non-redundant
SIMATIC stations and (redundant) SIMATIC H stations. You set the parameters of the fault-
tolerant S7 connections in NetPro.
The required communication blocks for data transmission (measured values, binary values,
interlocks) are available in the
transmission mechanism which, for example, may be secured or unsecured.
Additional information
● Section " How to add a SIMATIC H station to your project (Page 90) "
● Section " How to insert synchronization modules into the H CPU (Page 91) "
● Section " How to configure redundant communication processors (Page 93) "
● Section " Time synchronization (Page 88) "
● Manual
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used for communication between the automation system and the OS servers.
automation system to the distributed I/O devices.
Automation System S7-400H; Fault-tolerant Systems
PCS 7 Library . The communication blocks differ in their
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02