Siemens SIMATIC ET 200AL, System Manual

Page: 1745 / 2255

Functions
5.4 Media redundancy (ring topologies)
PROFINET with STEP 7
180
Function Manual, 05/2021, A5E03444486-AL
"Media redundancy" setting options
Media redundancy role
Depending on the device used, the roles "Manager", "Manager (auto)", "Client" and "Not
device in the ring" are available.
Rules:
•
A ring must have precisely one device with the role "Manager". No additional devices with
the role "Manager" or "Manager (auto)" are permissible. All the other devices may only
have the "Client" role.
• If a ring has no device with the "Manager" role, the ring must at least have a device with
the role "Manager (auto)". Any number of devices with the "Client" role may exist.
• Managers and clients of an MRP domain can be configured in different projects. In the
project without a manager, you need to select the "Redundancy manager outside the
project" option so that the configuration can be compiled. For multiple ring
configurations, you need to set the option identically for each MRP domain.
Ring port 1 / 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.
If you use single-stage commissioning, use the preset ring ports in STEP 7.
Diagnostic interrupts
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
Diagnostic interrupts will be generated 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 (redundancy manager only)
– In case the ring is interrupted, a diagnostic interrupt "Ring open (incoming)" is
generated.
– When the ring is closed, the diagnostics "Ring open (outgoing)" is generated.
You can respond to these events in the user program by programming the appropriate
response in the diagnostic error interrupt OB (OB 82).
Reference
You can find the procedure for configuring a common MRP ring and the topology with two
projects in this FAQ ( https://support.industry.siemens.com/cs/ww/en/view/109741671 ).