Mrp Interconnection - Siemens SIMATIC NET System Manual

Network structures and network configuration
2.3 Media redundancy
Requirements
The 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.
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 enabled for all devices in the ring.
● 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
2.3.4

MRP Interconnection

The MRP Interconnection mode is an extension of MRP and enables redundant linking of
two or more MRP rings in networks without real-time capability. Like MRP, MRP
Interconnection is specified in the standard IEC 62439-2. MRP Interconnection allows for
very fast reconfiguration; the reconfiguration time is typically less than 200 milliseconds.
86
tab of the properties dialog.
automatically to autonegotiation.
System Manual, 09/2019, C79000-G8976-C242-10
Industrial Ethernet