Siemens Simatic S7-1500R - Technical Specifications; Work Memory; Load Memory; Backup

The redundancy connections in S7-1500R are the PROFINET ring with MRP. The CPUs are
synchronized over the PROFINET ring.
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① Load current supply (optional)
② CPU S7-1515R-2PN
③ PROFINET cable (redundancy connections, PROFINET ring)
④ IO device in the PROFINET ring
⑤ Switch
⑥ IO device outside the PROFINET ring (separated with a switch)
Figure 4-11S7-1500R configuration variant
S7-1500H
You connect the CPUs to the Industrial Ethernet over a PROFINET interface or using an
additional switch.
S7-1500H supports the following number of PROFINET devices (switches, S7-1500H CPUs,
S7-1500 CPUs (V2.5 or later), HMI devices, and IO devices such as ET200MP and ET200SP):
max. 50 in PROFINET ring
S7-1500H supports the following number of IO devices on the H-CPUs: max. 256 in PROFINET
network (ring, line or combined topology)
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System overview
4.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD