Siemens SIMATIC ET 200AL, System Manual

Page: 1864 / 2255

PROFINET with the redundant S7-1500R/H system
6.6 Installation guidelines
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
299
6.6 Installation guidelines
Configuration requirements for a ring topology with the redundant S7-1500R system
• The two CPUs have the media redundancy role "Manager (auto)".
• All other devices in the PROFINET ring have the media redundancy role "Client".
• No other redundant S7-1500R/H system is present in the PROFINET ring.
• Port interconnection:
– The two CPUs are directly interconnected via one of the two ports of PROFINET
interface X1. No other devices of the ring are located in between.
– The two CPUs can be indirectly interconnected via the other two ports. The other
devices of the ring are located in between. See the examples below.
• Max. number of IO devices: 64
Note
Standard IO devices in the redundant system S7-1500R
Standard IO devices usually do not support H-Sync Forwarding.
To avoid a cycle time increase when the PROFINET ring is interrupted, integrate the
standard IO devices behind a switch and not in the PROFINET ring.
• Number of PROFINET devices (IO devices, switches, S7-1500R CPUs, S7-1500 CPUs (V2.5
or later) and HMI devices) in the PROFINET ring:
– Max. 50 (recommended: max. 16)
Note
Recommendation: The number of devices in the PROFINET ring influences the availability
of the S7-1500R system. The number of PROFINET devices including R-CPUs in the
PROFINET ring should not exceed 16. If you operate significantly more devices in the
PROFINET ring, the availability of the IO devices and R-CPUs is reduced. The technical
specifications in the documentation are based on the recommended maximum of 16
PROFINET devices in the ring in S7-1500R.
Configuration requirements for a ring topology with the redundant S7-1500H system
• The two CPUs have the media redundancy role "Manager (auto)".
• All other devices in the PROFINET ring have the media redundancy role "Client".
• No other redundant S7-1500R/H system is present in the PROFINET ring.