System overview
2.3 S7-1500 R/H-CPUs
S7-1500R/H redundant system
36
System Manual, 10/2018, A5E41814787-AA
Reference
The full technical specifications can be found in the manuals for the CPUs and on the
Internet (
https://mall.industry.siemens.com
).
2.3.2
Redundancy
Introduction
The S7-1500R/H redundant system is based on media redundancy (MRP) in the PROFINET
ring.
All PROFINET IO devices assigned to the S7-1500R system must support system
redundancy S2. These PROFINET IO devices can be located in the PROFINET ring or they
can be separated with a switch.
All PROFINET devices in the PROFINET ring must support media redundancy (MRP). The
H-Sync forwarding function is also recommended for S7-1500R. System redundancy S2 is
not a requirement. For example, you can use switches and HMI devices without system
redundancy S2.
Media redundancy
Media redundancy is a function for ensuring network and plant availability.
The two CPUs in the redundant system must be located in a PROFINET ring that uses the
MRP media redundancy protocol.
S7-1500R uses the PROFINET ring to synchronize the two CPUs. S7-1500H uses the
redundancy connections over fiber-optic cables to synchronize the two CPUs. The
PROFINET ring (over PROFINET interfaces X1) of the H CPUs is also mandatory for S7-
1500H.
To set up a ring topology with media redundancy, you need to bring together the free ends of
a linear network topology in one device using two ports (ring ports, port label "R"). You
specify the ring ports in the device configuration.
In the S7-1500R/H redundant system, you need to set the media redundancy role for each of
the two CPUs to Manager (Auto). For all other PROFINET devices in the PROFINET ring,
the media redundancy role Client must be configured. There is a communication connection
based on MRP between the redundancy manager and the redundancy clients. The Media
Redundancy Protocol (MRP) automatically reconfigures the data paths between the
individual devices if the ring is interrupted at any point.
You configure the media redundancy role for PROFINET devices with system
redundancy S2 in STEP 7. For switches without system redundancy S2, you set the media
redundancy role to "Client" over the Web interface.
Summary of Contents for Simatic S7-1500H
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