Configuration
A pre-existing network can be used for high availability communication between non-redundant
SIMATIC stations and (redundant) SIMATIC H stations. You set the parameters of the high
availability S7 connections in NetPro.
The required communication blocks for data transmission (measured values, binary values,
interlocks) are available in the
PCS 7 Library
. The communication blocks differ in their
transmission mechanism which, for example, may be secured or unsecured.
Additional information
● Section "How to add a SIMATIC H station to your project (Page 108)"
● Section "How to insert synchronization modules into the H CPU (Page 110)"
● Section "How to configure redundant communication processors (Page 111)"
● Section "Time synchronization (Page 105)"
● Manual
Automation System S7-400H; High Availability Systems
4.2.2 How the SIMATIC S7-400H AS operates
Active redundancy
The automation system consists of two redundantly configured subsystems, which are
synchronized through fiber-optic cables.
The two subsystems form a high availability automation system that operates with a dual-
channel design according to the principle of active redundancy. Active redundancy, often
referred to as functional redundancy, means that all redundant components are in continual
operation and simultaneously involved in the acquisition of process data. The control task is
the responsibility of the redundancy partner that is active at any given time. The user programs
loaded in both CPUs are fully identical and are run synchronously by both CPUs.
If the active CPU fails, the automation system automatically switches to the redundant CPU
(see section "Hardware components of the S7-400H (Page 50)" and documentation
Process
Control System, SIMATIC PCS 7, Released Modules
). The switchover has no effect on the
ongoing process because it is bumpless.
Additional information
● Section "Failure of the master CPU (Page 202)"
● Section "Failure of a fiber-optic cable (Page 202)"
● Manual
Automation System S7-400H; High Availability Systems
High availability solutions in PCS 7
4.2 Solutions for automation systems
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 53
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