Communication
11.2 PROFINET
S7-1200 Programmable controller
956 System Manual, V4.2, 09/2016, A5E02486680-AK
Using Media Redundancy Protocol (MRP)
The "MRP" process works in conformity with Media Redundancy Protocol (MRP), which is
specified in IEC 61158 Type 10 "PROFINET".
The following requirements must be met for error-free operation with MRP:
● The ring in which you want to use MRP may only consist of devices that support this
function.
● "MRP" must be activated for all devices in the ring.
● All devices must be interconnected using their ring ports.
● At least one MRP manager (role "Manager (Auto)") must be available.
● The ring must contain not more than 50 devices. Otherwise, reconfiguration times of
greater than or equal to 200 ms can occur.
● All partner ports within the rings must have the identical settings.
The following schematic shows a possible topology for devices in a ring with MRP. The
devices inside the shaded oval are in the redundancy domain.
This is an example of a ring topology with MRP:
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