Siemens Simatic PCS 7 Function Manual page 60

High availability solutions in PCS 7
4.3 Solutions for communication
Media Redundancy Protocol (MRP)
For redundant coupling in a fieldbus ring based on PROFINET, all devices must support MRP.
Note
Industrial Ethernet switches that support MRP
The following Industrial Ethernet switches support the MRP function:
● SCALANCE XB-200 as of firmware V1.2
● SCALANCE X-200 as of firmware V4.0
● SCALANCE XC-200 as of firmware V2.1
● SCALANCE XP-200 as of firmware V2.0
● SCALANCE X-300 as of firmware V3.0
● SCALANCE X-400 as of firmware V3.0
Configuration of the watchdog time
When a transmission path fails, it may take up to 200 ms to reconfigure the network (switching
to the redundant transmission path).
Increase the watchdog time for each station by adjusting the following values:
● Select the "fixed update time" setting.
● Increase the update time to a value that is less than the fastest update of the process image
partition (PIP) for this station.
● Increase the number of accepted update cycles with missing I/O data, so that the watchdog
time is > 200 ms.
Additional information
● You can find information about configuration of PROFINET in the
manual; System Description. You can find more information on internet
support.industry.siemens.com/cs/ww/en/view/19292127).
● You can find information about HRP and MRP in the documentation of the Industrial
Ethernet switches.
● You can find information about High-availability Seamless Redundancy (HSR) in the
section "Redundant, high availability terminal bus based on the Parallel Redundancy
Protocol (PRP) (Page 64)".
See also
How to configure the redundant terminal bus on the basis of the Parallel Redundancy
Protocol (Page 115)
How to configure a high availability plant bus (Page 117)
How to configure a media-redundant fieldbus on the basis of PROFINET (Page 125)
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PROFINET System
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High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA