Siemens SIMATIC ET 200AL System Manual page 1867

PROFINET with the redundant S7-1500R/H system
6.7 Configuring PROFINET IO on a redundant S7-1500R/H system
Additional PROFINET IO system in the configuration
The configuration can also contain additional IO controllers with their own IO devices. To
ensure that enough bandwidth is available in the PROFINET ring for the redundant
S7-1500R/H system, place additional IO controllers with their I/O downstream of a switch.
When determining the maximum number of IO devices inside and outside the PROFINET ring,
the redundant system does not detect the S7-1500 CPUs and their IO devices. If you use
S7-1500 CPUs, you must check the maximum number yourself.
The following figure shows a redundant S7-1515R system. An additional PROFINET IO system
with a CPU 1516 as IO controller is located downstream of the switch. A separate standard
IO device has been assigned to the IO controller.
Figure 6-6
302
Example of a redundant S7-1500R system with an additional PROFINET IO system
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL