Siemens SIMATIC S7-1500 System Manual page 194

Wiring
7.9 Connecting interfaces for communication with S7-1500H
Accessories required
PROFINET cable for line topology
Connecting line topology with S2 devices
Plug the RJ45 connectors of the PROFINET cable of the line topology into each of the RJ45
sockets of the PROFINET interfaces X1 P1R of the two H-CPUs.
Figure 7-15 Connect line topology with S2 devices to S7-1500H
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD