Siemens SIMATIC ET 200AL System Manual page 1530

Communication via the system IP address X2
If the CPUs of the S7-1500R/H redundant system have two PROFINET interfaces, preferably
use the PROFINET interface X2 for communication with other devices.
The following figure shows a configuration in which the communication partners are
connected via the respective PROFINET interfaces X2 with the CPUs of the redundant system
S7-1500R/H.
①
②
③
Figure 14-1
Communication
Function Manual, 05/2021, A5E03735815-AJ
Open User Communication between a different CPU and the S7-1500R/H redundant system
HMI communication with the S7-1500R/H redundant system
Open User Communication between the S7-1500R/H redundant system and a PC
Example: Communication of the S7-1515R redundant system via the system IP address
X2
Communication with the redundant system S7-1500R/H
14.1 System IP addresses
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