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Media Redundancy Protocol (MRP)
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6 Media Redundancy Protocol (MRP)
6.1 General function
Loops A ring can be created in the network using MRP according to IEC 62439 and a redundant
connection provided. Each ring must contain an MRP manager, all other devices (in the
ring) must support the MRP client function. The ring is created using dedicated ports. The
MRP ports must be configured in the switch management. When configured correctly, MRP
offers a guaranteed maximum switch-over time of 200 ms.
For the MCS, the necessary MRP manager function can be implemented with the “FL MEM
Plug/MRM” configuration memory (Order No. 2891275).
6.2 MRP manager
For the MMS/MCS, the MRP manager function is provided by an interface module/MEM
plug. Since the manager function is linked to a replaceable module, the following options are
available:
–
If no manager module is present, “MRP Manager” mode is not available or cannot be
selected.
– If a manager function module is inserted during runtime or if it is already present during
the boot process, “MRP Manager” mode is available or accepted in the user interfaces.
– If a manager function module is present during the boot process and “MRP Manager”
mode is activated in the saved configuration of the MMS/MCS, the MRP manager func-
tion is automatically enabled.
– If no manager function module is present during the boot process and the MRP manag-
er is enabled in the saved configuration, the device activates a “safe state”, in which one
of the ring ports is set to blocking mode to prevent loop generation. An error message
appears, which would also be displayed in the event of a ring error, informing the user
of this configuration error. After inserting the manager function module, the manager
can be re-enabled manually or a reboot executed.
– If a manager function module is removed during runtime, the MRP manager can no lon-
ger be selected.
– If a manager function module is removed while the MRP manager is active, the mode
remains active until the device is restarted or is switched to another mode (MRP client,
disabled).
Please note that MRP is disabled by default upon delivery.