Siemens SIMATIC S7-1500 System Manual page 516

A switch thus has the task of regenerating and distributing received signals. The switch
"learns" the MAC addresses of a connected PROFINET device or additional switches. The
switch only forwards those signals that are intended for the connected PROFINET device or
switch.
A switch has a specific number of connections (ports). You connect at most one PROFINET
device or additional switch to each port.
Switched S1 device
The "Switched S1 device" function of the CPU enables operation of standard IO devices on the
S7-1500R/H redundant system.
PROFINET communication runs on an AR between the primary CPU and the standard IO
device. When replacing the primary CPU, the standard IO device is briefly disconnected from
the S7-1500R/H redundant system until the new primary CPU has set up an AR to the
standard IO device. If a line topology in S7-1500H is interrupted, the backup CPU establishes
an AR to the standard IO device after a short time.
Synchronization module
You use the synchronization modules to create the redundancy connections between the
CPUs of the redundant S7-1500H system. You need two synchronization modules per CPU
that you connect in pairs with fiber-optic cables.
System power supply
Consists of the integrated system power supply of the CPU and additional power supplies
(PS), if necessary. The system power supply is used exclusively to supply the modules via the
backplane bus.
System states
The system states of the S7-1500R/H redundant system result from the operating states of
the primary and backup CPU. The term system state is used as a simplified expression that
refers to the operating states that occur simultaneously on both CPUs. The S7-1500R/H
redundant system has the system states STOP, STARTUP, RUN-Solo, SYNCUP and RUN-
Redundant.
System IP address
In addition to the device IP addresses of the CPUs, the redundant system S7-1500R/H
supports system IP addresses. You use the system IP addresses for communication with other
devices (for example, HMI devices, CPUs, PG/PC). The devices always communicate over the
system IP address with the primary CPU of the redundant system. This ensures that the
communication partner can communicate with the new primary CPU (previously backup CPU)
in the RUN-Solo system state after failure of the original primary CPU in redundant operation.
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
Glossary
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