Siemens SCALANCE X-300 Configuration Manual page 352

PROFINET IO functionality
6.5 MRP configuration
Role
The choice of role depends on the following use cases.
● You want to use MRP in a ring topology only with Siemens devices and without
monitoring diagnostic interrupts:
Assign all devices to the "mrpdomain-1" domain and the role "Manager (Auto)".
The device that actually takes over the role of redundancy manager, is negotiated by
Siemens devices automatically.
● You want to use MRP in a ring topology that also includes non-Siemens devices or you
want to receive diagnostic interrupts relating to the MRP status from a device (see
"Diagnostic interrupts"):
– Assign precisely one device in the ring the role of "redundancy manager".
– For all other devices in the ring topology, select the role of "Client".
● You want to disable MRP:
Select the option "Not node in the ring" if you do not want to operate the device within a
ring topology with MRP.
Note
Role after resetting to factory settings
Brand new Siemens devices and those reset to the factory settings have the MRP role
"Manager (Auto)" (CPs) or "Automatic Redundancy Detection" (SCALANCE X). If you are
operating a non-Siemens device as the redundancy manager in the ring, this may cause
loss of the data traffic.
Ring port 1 / ring port 2
Here, select the port you want to configure as ring port 1 and ring port 2.
With devices with more than 8 ports, not all ports can be selected as ring port.
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Note
To ensure problem-free operation when using a non-Siemens device as the
redundancy manager in the ring, make sure that you assign the fixed role of "Client" to
all other devices in the ring, before you close the ring. Otherwise, there may be
circulating data frames that will cause a failure in the network.
Configuration Manual, 10/2014, C79000-G8976-C187-22
SCALANCE X-300 / X-400