Configuring the Ethernet CP with STEP 7
3.5 Media redundancy
Configuring and commissioning S7 CPs for Industrial Ethernet
74 Configuration Manual, 09/2013, C79000-G8976-C182-13
MRP configuration
Configuration in STEP 7
To create the configuration in STEP 7, select the parameter group "Media redundancy" on
the PROFINET interface.
Set the following parameters for the MRP configuration of the device:
● Domain
● Role
● Ring port
● Diagnostic interrupts
These settings are described below.
Note
Prioritized startup
If
you configure MRP in a ring, you cannot use the "prioritized startup" function in PROFINET
applications on the devices involved.
If you want to use the "prioritized startup" function, then disable MRP in the configuration.
In the STEP 7 configuration, set
the role of the relevant device to "Not a node in the ring".
Leave the default entry "mrpdomain 1" from the factory settings in the "Domain" drop-down
list.
All devices configured in a ring with MRP must belong to the same redundancy domain. A
device cannot belong to more than one redundancy domain.
If you leave the setting for "Domain" as the factory set "mrpdomain-1", the defaults for "Role"
and "Ring ports" also remain active.
The MRP settings remain in effect following a restart of the device or following a power down
and hot restart.
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.
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