Pcs 7 Redundancy Concept - Siemens SIMATIC PCS 7 Function Manual

2.3

PCS 7 redundancy concept

Advantages of the PCS 7 redundancy concept
Fault-tolerant process control systems can be realized with SIMATIC PCS 7 at minimal cost
in all phases of a system lifecycle:
● Configuration
● Commissioning/operation
● Servicing
● Expansion
PCS 7 offers the following essential advantages:
● It provides you with system-wide scalable solutions based on the PCS 7 modular design.
Advantage: The availability can be matched to your requirements. Your process control
system can be upgraded with the SIMATIC PCS 7 components that are actually needed.
● Hardware upgrades for fault tolerance do not depend on the software configuration.
Advantage: If the user program has been configured with PCS 7, it does not have to be
adapted following a hardware upgrade. You only need to download the new hardware
configuration into the CPU.
● Fault-tolerant automation system S7-400H with CPU (types: see documentation
Control System PCS 7; Released Modules ), whose module racks can be set up in separate
locations.
Advantage: Protection for the spatially separated CPUs resulting in increased availability
in case of fire or explosion, for example.
● The use of redundant components in the process control system means isolated errors are
tolerated.
Advantage: The entire system does not fail when a single component in the process control
system fails. The redundant component takes over its tasks therefore allowing the process
to continue.
● Every failure of a redundant component is indicated on the OS clients in the form of a
process control message.
Advantage: You immediately receive crucial information about the status of your redundant
component. Specific components that have failed can be quickly replaced to restore the
redundancy.
● Software updates on redundant OS servers can be performed without loss of process
operability or loss of data.
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
Basics of Fault Tolerance
2.3 PCS 7 redundancy concept
Process
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