Mrp - Siemens SCALANCE X-300 Configuration Manual

Network management for industrial networks
2.3 Options of media redundancy
2.3.2

MRP

The "MRP" method conforms to the Media Redundancy Protocol (MRP) specified in the
following standard:
IEC 62439-2 Edition 1.0 (2010-02) Industrial communication networks - High availability
automation networks Part 2: Media Redundancy Protocol (MRP)
The reconfiguration time after an interruption of the ring is a maximum of 0.2 seconds.
Requirements
Requirements for problem-free operation with the MRP media redundancy protocol are as
follows:
● MRP is supported in ring topologies with up to 50 devices.
Except in PROFINET IO systems, topologies with up to 100 SCALANCE X-200 and
SCALANCE X-300 IE switches were tested successfully.
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.
These include, for example, some of the Industrial Ethernet SCALANCE X switches,
some of the communications processors (CPs) for SIMATIC S7 and PG/PC or non-
Siemens devices that support this function.
● All devices must be interconnected via their ring ports.
Multimode connections up to 3 km and single mode connections up to 26 km between
two SCALANCE X IE switches are possible. At greater distances, the specified
reconfiguration time may be longer.
● "MRP" must be activated on all devices in the ring (see section "X-300/X-400 Ring
Configuration (Page 69)").
● 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.
– STEP 7: Set all the ports involved in the ring to "Automatic settings" in the "Options"
– WBM: If you configure with Web Based Management, the ring ports are set
20
tab of the properties dialog.
automatically to autonegotiation.
Configuration Manual, 10/2014, C79000-G8976-C187-22
SCALANCE X-300 / X-400