Omron GRT1-PNT - DATASHEET 2 Operation Manual page 47

Setting up the PROFINET IO network
2-5-1-4 Ring
2-5-2 MRP Ring Redundancy
The ring topology is achieved by closing both ends of a line. A network
redundancy ring protocol such as MRP (see section 2-5-2 MRP Ring
Redundancy) will provide a method of monitoring the state of the network and
switch the communication path in case of problems.
Benefits:
• Malfunction of a single switch / IO Device will not result in disconnecting
part of the network. The network redundancy mechanism will automatically
maintain the connection with the other devices.
/i
Part Recommendation
Switch Industrial Ethernet Switch supporting MRP manager protocol. Suggestion:
Hirschmann Automation and Control GmbH, Series RS20/30/40, Software
Version 4 or higher.
The internal Ethernet Switch in the GRT1-PNT Unit supports the Media
Redundancy Protocol (MRP). This protocol, which is part of the PROFINET IO
Specification, enables the Unit to be part of a ring-shaped network structure.
This ring network structure will give network redundancy.
In case one of the line connections fails, the MRP ensures communication to
all IO Devices remains possible through the redundant path. The ring structure
can contain up to 50 Units and typically switches to the redundant path within
150 ms (max 500 ms).
The network requires an MRP manager to facilitate the redundancy. As an
MRP client, there are no specific settings required for the GRT1-PNT Unit.
Please refer to the manual of the used MRP manager unit for details on how to
set up and operate the MRP network.
Switch / MRP Manager
Section 2-5
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