Siemens Simatic S7-1500R System Manual page 94

Connecting HMI devices over Industrial Ethernet, example with CPU 1517H-3 PN
The figure below is an example of how you can connect the CPU 1517H-3 PN to an HMI
device over Industrial Ethernet.
Figure 3-25
CPU 1517H-3 PN has a PROFINET IO interface with two ports (X1 P1 R and X1 P2 R) and
one PROFINET interface (X2 P1).
To connect an HMI device to the CPUs over Industrial Ethernet, you use the X2 PROFINET
interfaces of the CPU. PROFINET interface X2 supports PROFINET basic functionality. The
interface is, for example, suitable for communication with an HMI device or configuration and
programming software (Engineering Station).
Note
A PROFINET device (such as an HMI device) can only communicate with the redundant
system over the system IP address if it has been connected to both R/H-CPUs. Always
connect the PROFINET device to the same interfaces, X1 or X2, on both R/H-CPUs. Do not
mix interfaces X1 and X2: If you mix interfaces X1 with X2, the HMI connection is no longer
redundant.
The R/H-CPUs do not support S7 routing: If you connect the HMI device over the system IP
address of the PROFINET X2 interfaces, only the backup CPU will be accessible if the cable
to the primary CPU is interrupted.
You can find additional information on the interfaces of CPU 1517H-3 PN in the relevant
device manual.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
H-CPU configuration example
Application planning
3.8 Using HMI devices
93