Network topologies / media redundancy

2.4 MRP

SCALANCE X-200
Operating Instructions, 12/2011, A5E00349864-19 25

2.4 MRP

The "MRP" method conforms to the Media Redundancy Protocol (MRP) specified in the
standard IEC 62439-2 Edition 1.0 2010-02.
The reconfiguration time after an interruption of the ring is a maximum of 0.2 seconds.
Requirements
The following requirements must be met for problem-free operation with the MRP media
redundancy protocol:
● MRP is supported in ring topologies with up to 50 devices. Exceeding this number of
devices can lead to a loss of data traffic.
● The ring in which you want to use MRP may only consist of devices that support this
function. This applies, for example, to the following devices:
– Industrial Ethernet switches
SCALANCE X-200 as of firmware version V4.0
SCALANCE X-200 IRT as of firmware version V4.0
SCALANCE X-300 as of firmware version V3.0
SCALANCE X-400 as of firmware version V3.0
– Communications processors
CP 443-1 Advanced (6GK7 443-1GX20-0XE0) as of firmware version V2.0
CP 343-1 Advanced (6GK7 343-1GX30-0XE0) as of firmware version V1.0
CP 1616 (6GK1 161-6AA00) as of firmware version V2.2
CP 1604 (6GK1 160-4AA00) as of firmware version V2.2
– Non-Siemens devices that support this functionality.
Further Siemens devices are planned that will support MRP.
● All devices must be interconnected via their ring ports.
● If you configure in STEP 7, MRP must be enabled on all devices in the ring (see "MRP
configuration in PROFINET IO").
● If you configure with Web Based Management, CLI or SNMP, set all the devices in the
ring to "MRP Client" or "Automatic Redundancy Detection". At least one device in the ring
must have the setting "Automatic Redundancy Detection".
In their basic status, the "Automatic Redundancy Detection" mode is set on IE switches
as default.
● The connection settings (transmission medium / duplex) must be set to full duplex and at
least 100 Mbps for all ring ports. Otherwise there may be a loss of data traffic.
– To do this, set all the ports involved in the ring to "Automatic settings" in the "Options"
tab of the properties dialog during STEP 7 configuration.
– If you configure with Web Based Management, the ring ports are set automatically to
autonegotiation.