Manual for MVK-MPNIO Modules
16 V 1.9
2.5 Media redundancy protocol (MRP)
T
he MRP protocol according to IEC 62439 describes PROFINET redundancy with a typical re-
configuring time of < 200 ms for communication paths with TCP/IP and RT frames after a fault.
Error-free operation of an automation system involves a media redundancy manager (MRM)
and several media redundancy clients (MRC) arranged in a ring.
2. MR
M transmits test packets in both directions
3. M
RM connects through, because it does not receive it’s test packets
The task of a media redundancy manager (MRM) is to check the functional capability of the
configured ring structure. This is done by sending out cyclic test frames. As long as it receives
all of its test frames again, the ring structure is intact. As a result of this behavior, an MRM pre-
vents frames from circulating and converts a ring structure into a line structure.
A media redundancy client is a switch that acts only as a "passer" of frames and generally does
not assume an active role. It must have two switch ports in order to connect to other MRCs or
the MRM in a single ring.
MVKs from SW-version > 3.50 and GSD version equal or higher 2.25 can be configured as
MRC. (Article no.: 55256, 55257, 55283, 55528 und 55529)
To Next Page
Loading...