Multiple Rings - Siemens SIMATIC PROFINET Function Manual

Functions
5.4 Media redundancy (ring topologies)
The figure below shows the display of the redundancy levels in STEP 7 for the example
configuration.
Figure 5-38
5.4.4

Multiple rings

Multiple rings
Use multiple rings to achieve higher availability for PROFINET IO networks with star
topology.
In a multiple ring configuration, several PROFINET lines lead from a switch (star topology).
The individual PROFINET lines lead from IO device to IO device. Redundant PROFINET
cables run back to the switch from the last IO device on each individual line.
The switch operates as a manager. The manager must have two ring ports for each ring.
Several rings are possible. For example, the SCALANCE X414 as of firmware version 3.10
supports up to 4 rings.
152
Display of the redundancy levels in STEP 7
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG