Siemens SIMATIC S7-1500R/H Manual - Page 14

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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.

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).

CPU 1517H-3 PN (6ES7517-3HP00-0AB0)

Equipment Manual, 11/2019, A5E42011886-AB

2.2 Configuration and operating principle

Product overview