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Product overview
2.1 Configuration and operating principle
Principle of operation
One of the two CPUs in the redundant system takes on the role of CPU for process control
(primary CPU). The other CPU takes on the role of the following CPU (backup CPU). The role
of the CPUs can change during operation. All relevant data is synchronized from the primary
CPU to the backup CPU via the fiber-optic cables of the redundancy connections.
Synchronization between the primary CPU and backup CPU ensures fast switching between
CPUs in the event of a primary CPU failure. If the primary CPU fails, the backup CPU retains
control of the process as the new primary CPU at the point of interruption.
The redundancy connections consist of two fiber-optic cables, which directly connect the
CPUs via plug-in synchronization modules.
The integrated F functionality with Safety Integrated processes standard and safety
programs. You can find more information in the SIMATIC Safety - Configuring and
Programming (https://support.industry.siemens.com/cs/ww/en/view/54110126)
programming and operating manual.
Additional information
You can find a detailed description of the operation and design of the S7-1500H redundant
system in the system manual for Redundant System S7-1500R/H
(https://support.industry.siemens.com/cs/ww/en/view/109754833).
10
CPU 1518HF-4 PN (6ES7518-4JP00-0AB0)
Equipment Manual, 05/2021, A5E49868646-AA
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