Siemens SIMATIC S7-1500 System Manual page 24

System overview
4.1 What is the S7-1500R/H redundant system?
Feature
Failures, especially in the process industry, can result in damages to the system, workpieces
or material. In a steelworks, there is a danger of the pig iron cooling if the process is
interrupted. The pig iron then cannot be used for the production of steel. The automation
solution must ensure that the plant continues to run if a CPU fails and that the material is not
damaged.
Solution
The S7-1500R redundant system controls the blast furnace. The distributed automation
components of the redundant system control the temperature, volume and pressure
parameters.
Figure 4-3 Example: Blast furnace
Benefits
The S7‑1500R redundant system compensates for the possible failure of a CPU or redundant
connection. You do not have to interrupt the smelting process when replacing a CPU while
the plant is running. Uninterrupted plant operation avoids high restart and material costs.
Reference
You can find an example for SIMATIC Safety Integrated with the 1518HF-4 PN CPUs in the
section Safety (Page 55).
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD