Technical basics
3.6 Redundancy
SCALANCE SC-600 Web Based Management (WBM)
Configuration Manual, 10/2021, C79000-G8976-C475-03
47
The following rules apply to a ring topology with media redundancy using MRP:
• All the devices connected within the ring topology are members of the same
redundancy domain.
• One device in the ring is acting as redundancy manager.
• All other devices in the ring are redundancy clients.
Non MRP-compliant devices can be connected to the ring via a SCALANCE X switch or
via a PC with a CP capable of MRP.
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, and 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" tab of the properties dialog.
– WBM: If you configure with Web Based Management, the ring ports are set
automatically to autonegotiation.
Example for configuration
You can find an example for configuration of a ring topology based on "MRP" on the
Internet pages of Siemens Industry Online Support.
Link: (https://support.industry.siemens.com/cs/ww/en/view/109739614)
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