6 Starting operation
6.7 Media Redundancy Protocol
(MRP)
6.7 Media Redundancy Protocol (MRP)
Redundant PROFINET communication can be implemented with the LioN-P
modules via a ring topology without the use of additional switches. A MRP
redundancy manager terminates the ring, detects individual failures, and
transmits the data packets on the redundant path in case of error.
The following conditions must be met to use MRP:
D
All devices must support MRP.
D
MRP must be enabled on all devices.
D
Connections to the devices are only possible via the ring ports. A mesh
topology is not permissible.
D
A max. of 50 devices are permissible in the ring.
D
All devices share the same redundancy domain.
D
One device must be configured as the redundancy manager.
D
All other devices must be configured as redundancy clients.
D
Prioritized boot (FSU) is permissible.
D
The response monitoring time of all devices must be greater than the
reconfiguration time (typically 200 ms, min. 90 ms for LioN-P modules).
D
It is recommended to use automatic network settings on all devices.
The following figures show a possible MRP ring configuration. The PLC is
used as the redundancy manager while all other devices are clients. To detect
an individual failure, it is advisable to use the diagnostics alerts.
Manual LioN-P PROFINET IO-Link Master
Version 2.1 10/2017
55
