PROFINET Communication
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4.7.2 MRP Function and Configuration
MRP Overview
The AC drive adopts the standard Media Redundancy Protocol (MRP) that meets the
IEC62439‑2 standard. It provides a typical reconstruction time of 200 ms and supports
up to 50 devices in each ring network.
MRP basic rules:
1. All nodes in the ring network must support and be enabled with MRP.
2. All devices are interconnected through ring ports.
3. All devices in the ring network are in the same redundancy domain.
4. A maximum of 50 devices can be connected in a ring network. More devices will
prolong the reconstruction time.
5. Only one device in the ring network can serve as the ring network manager, and
other devices are all ring network clients.
MRP Settings
1. Select a PLC port, choose "Properties" > "Media redundancy". In the drop‑down list
of "Media redundancy role", select "Manager". Check the parameters of "Ring port
1" and "Ring port 2".
2. Select an I/O device port, choose "Properties" > "Media redundancy". In the drop‑
down list of "Media redundancy role", select "Client". Check the parameters of
"Ring port 1" and "Ring port 2".
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