Siemens SIMATIC CPU 410 System Manual page 98

I/O configuration variants
6.8 Media redundancy
Configuration
The following figure shows examples of the connection of IO devices to the PROFINET IO
system:
Configura- Properties
tion
①
Media redundancy
Each node is connected to two other nodes in a ring configuration.
The IO controller must be configured as an MRP manager in HW Config.
The nodes connected to PROFINET IO must be assigned unique names.
②
Media redundancy + system redundancy
The PROFINET IO system begins and ends at one IO controller each in this example.
Each node is connected to two other nodes in a ring configuration.
The MRP parameter assignment must be complete. If a PROFINET IO system is created at each PN IO
connection of the CPU, a newly inserted interface module is automatically connected to the PROFINET IO
system of the CPU.
The nodes on the fieldbus (PROFINET IO) must be assigned unique names.
Installing a ring topology
To set up a ring topology with media redundancy, you must join both free ends of a line
network topology in the same device. You join the line topology to form a ring via two ports
(ring ports, port ID "R") of a device connected to the ring.
The data paths between the individual devices are automatically reconfigured if the ring is
interrupted at any point. The devices are available again after reconfiguration.
Note
The real-time communication is interrupted (station failure) when the reconfiguration time of
the ring exceeds the selected watchdog time of the IO devices. This applies to all IO devices
whose IO data is transmitted over a ring.
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CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC