4.2 Solutions for automation systems
Introduction
This chapter presents solutions that can be used to increase the availability of an automation
system.
S7-400H high availability programmable controller
Only a high availability automation system can ensure an extremely short process safety time,
for example, a switchover time in the milliseconds range. PCS 7 enables you to configure your
process control system with redundancy using the S7-400H high availability programmable
controller.
Functionality
The S7-400H programmable controller and all the other components in the PCS 7 environment
are tuned to one another.
With this solution, a second backup CPU, which is event-synchronized to the master CPU,
performs the same processing tasks of the user program as the master. If the active master
CPU fails, the standby CPU continues processing the user program without delay. This type
of standby is referred to as "Hot standby".
There are always two CPUs and two power supplies in an S7-400H. The communications
processors and I/O modules are expansion modules.
4.2.1 Hardware components of the S7-400H
Hardware components
The following hardware components are available for the configuration of the high availability
automation system.
Hardware components
Racks Rack UR2-H
Rack UR2
Rack UR1
Rack CR3
Central processing units Central processing unit CPU 410-5H
Central processing unit CPU 412-3H ... 5H PN/DP
Central processing unit CPU 414-4H ... 5H PN/DP
Central processing unit CPU 416-5H PN/DP
Central processing unit CPU 417-4H ... 5H PN/DP
Synchronization modules Synchronization modules
Synchronization cable Synchronization cable (up to 10 km)
High availability solutions in PCS 7
4.2 Solutions for automation systems
High Availability Process Control Systems (V9.0)
50 Function Manual, 05/2017, A5E39221836-AA
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