System overview
5.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
76 System Manual, 01/2024, A5E41814787-AF
Differences between S7-1500R and S7-1500H
Table 5- 1 S7-1500R and S7-1500H system differences
CPU 1513R-1 PN
CPU 1517H-3 PN
• Transfer rate of 100 Mbps (for synchronization
and communication)
• Data work-memory:
– CPU 1513R-1 PN: max. 2.5 MB
– CPU 1515R-2 PN: max. 4.5 MB
• Code work-memory:
– CPU 1513R-1 PN: max. 600 KB
– CPU 1515R-2 PN: max. 1 MB
• Significantly greater performance than
S7-1500R due to:
– Separate redundancy connections over fi-
ber-optic cable
– High computing power
• transfer rate of 1 Gbps (for synchronization)
• Data work-memory:
– CPU 1517H-3 PN: max. 8 MB
– CPU 1518HF-4 PN: max. 60 MB
• Code work-memory:
– CPU 1517H-3 PN: max. 2 MB
– CPU 1518HF-4 PN: max. 9 MB
• The CPUs are identical in design with the re-
spective S7-1500 standard versions.
• Synchronization of the CPUs takes place over
the PROFINET ring.
• When you use PROFINET devices with more
than two ports (e.g. switch) in the PROFINET
ring of an R-system, then H-Sync forwarding is
mandatory for these devices.
• H-Sync forwarding is recommended for all
devices in the PROFINET ring if you are using
PROFINET devices with only 2 ports in the
PROFINET ring of an R-system.
• Part of the bandwidth on the PROFINET cable
is required for synchronization of the CPUs.
Less bandwidth is therefore available for
PROFINET IO communication.
• The CPUs each have 2 optical interfaces.
• The synchronization of the CPUs works inde-
pendently from the PROFINET network via op-
tical fiber.
• The full bandwidth of the PROFINET cable is
available for PROFINET IO communication.
• Distance between the two R-CPUs:
– Max. 100 m without media converter
– Several kilometers with media converter
(depends on the media converter used)
• Distance between the two H-CPUs:
– Maximum of 40 km (depends on the syn-
chronization modules used)
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