Fault-Tolerant Programmable Logic Controllers
1-4
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
1.2 Increasing System Availability
The S7-400H programmable logic controller meets these high requirements for
availability, intelligence and distribution that are required of state-of-the-art
programmable logic controllers. Further, it features all the functions for acquiring
and preparing process data and for controlling, regulating and monitoring units and
systems.
System-wide universality
The S7-400H programmable logic controller and all other SIMATIC components,
such as the SIMATIC PCS7 control system, are harmonized. Total system
universality, from the control console to the sensors and actuators, is a matter of
course and guarantees maximum system performance.
Control console
PLCs
Distributed I/O
Sensors/actuators
S7-400
S7-400H
system
S7-300
ET 200M
ET 200B
ET 200L
ET 200X
Single-user
OS
Report printer
Server Server
S7-400 with
fault-tolerant
CPU
Client Client
Engineering
System
DP/PA bus coupler
LAN (redundant)
PROFIBUS DP (redundant)
Figure 1-2 Universal automation solutions with SIMATIC
Graduated availability by duplicating components
The S7-400H is designed with redundancy so that it remains available at all
events. This means that all major components are duplicated.
The components that are duplicated as a matter of policy are the central
processing unit (CPU), the power supply and the hardware for interconnecting the
two central processing units.
You can decide for yourself whether you wish to duplicate more components for
the process you are going to automate and thus enhance their availability.
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