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Functions
5.4 Media redundancy (ring topologies)
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
Information on S7-1500R/H
You can find information on the media redundancy method MRP of the redundant
S7-1500R/H system in section Configuring PROFINET IO on a redundant S7-1500R/H system
(Page 1).
Application example: Reading the MRP status in the user program
The "LPNDR_ReadMRPState" function block from the "LPNDR" block library helps you to
determine the status of the MRP ring per program. The block reads the MRP information from
the PROFINET device (MRP Manager) and outputs the status.
The "LPNDR" block library and the corresponding documentation can be found in this
application example ( https://support.industry.siemens.com/cs/ww/de/view/109753067 ).
5.4.2 Configuring media redundancy
Configuring MRP
Proceed as follows to create a PROFINET IO configuration with MRP in STEP 7:
1.
Generate a ring via the port interconnections in the topology view. First interconnect the
devices to a line topology. Connect the unassigned port of the last device in the line with the
unassigned port of the first device.
The following example shows one CPU 1516-3 PN/DP and two interface modules IM
155-6 PN HF that are interconnected in a ring in the topology view of STEP 7.
Figure 5-38 Configuring media redundancy
2. Select the PROFINET IO system in the network view.
3. In the Inspector window, navigate to "Properties" > "General" > "PROFINET" > "MRP domains"
in the "Ring interconnections" field.
This field shows you all the topological rings in the IO system with the associated MRP
domains.