Communication
11.2 PROFINET
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
961
"Media redundancy" setting option: Ring port 1 and Ring port 2
Select one at a time those ports you want to configure as ring port 1 or ring port 2. The drop-
down list box shows the selection of possible ports for each device type. If the ports are set
at the factory, then the fields are unavailable.
Note
Ring port configuration is not necessary in the S7
-1200 because the S7-1200 CPU has only
If diagnostic interrupts to the MRP state are to be output in the local CPU, select the
"Diagnostic interrupts" check box. The following diagnostic interrupts can be configured:
● Wiring or port error:
The CPU generates diagnostic interrupts for the following errors in the ring ports:
– A neighbor of the ring port does not support MRP.
– A ring port is connected to a non-ring port.
– A ring port is connected to the ring port of another MRP domain.
● Interruption / return (MRP manager only):
If the ring is interrupted and the original configuration is returned, the CPU generates
diagnostic interrupts. If both of these interrupts occur within 0.2 seconds, this indicates an
interruption of the ring.
You can respond to these events in the user program by programming the appropriate
response in the diagnostic error interrupt OB (OB 82).
Note
Third-party devices as MRP manager
To assure error
-free operation when a third party device is used as MRP manager in a ring,
you must assign the fixed role of "Client" to all other devices in the ring before you close the
ring. Otherwise,
circulating data frames and network failure could occur.
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