Functions
5.4 Media redundancy (ring topologies)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
191
Configuring and assigning MRP interconnection parameters
Note
MRP interconnection is not integrated into the TIA Portal. This means you cannot configure,
parameterize and diagnose MRP interconnection in STEP 7.
You configure and assign MRP interconnection parameters via the integrated web pages
(Web Based Management) of the SCALANCE switches used as MIM and MIC (e.g. SCALANCE
XC200, XM-400, XR-500).
For the configuration, follow the step-by-step instruction in the configuration manual
SCALANCE XM-400/XR-500 Web Based Management (WBM)
https://support.industry.siemens.com/cs/ww/en/view/109760840
Reconfiguration and watchdog timer
The reconfiguration time of the rings is typically less than 200 milliseconds.
In order for the data exchange to work after a reconfiguration, the watchdog timers of the
IO devices must be set sufficiently large. Therefore, when using MRP interconnection, set the
watchdog timer of the IO devices to 256 milliseconds or more.
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