System Overview; What Is The S7-1500R/H Redundant System; Areas Of Application - Siemens SIMATIC S7-1500 System Manual

System overview

4.1

What is the S7-1500R/H redundant system?

S7‑1500R/H redundant system
For the S7-1500R/H redundant system, the CPUs are duplicated, in other words redundant.
The two CPUs process the same project data and the same user program in parallel. The two
CPUs are synchronized over two redundancy connections. If one CPU fails, the other CPU
maintains control of the process.
Aims of using redundant automation systems
The aim of redundant automation systems is to reduce the probability of production
downtime by operating two systems in parallel.
Aims of fail-safe automation systems
The aim of fail-safe automation systems is to protect life, the environment and capital with
safe shutdown to a secure state.
NOTE
In principle, all contents of the system manual for the H-CPU also apply to the fail-safe CPU
(HF-CPU). Deviating contents and special features are described as supplements and marked
with references.
4.1.1

Areas of application

Objective
The S7-1500R/H redundant system offers a high degree of reliability and system availability. A
redundant configuration of the most important automation components reduces the
probability of production downtimes and the consequences of component errors.
The higher the risks and costs of a production downtime, the more worthwhile the use of a
redundant system. You can compensate for the generally higher investment costs by
avoiding production downtimes.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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