System overview
2.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
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System Manual, 10/2018, A5E41814787-AA
2.1.4
Scalability
Introduction
Redundant systems are more cost-intensive to use than non-redundant systems:
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There are two CPUs.
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The physical connections (PROFINET ring and redundancy connections) can be required
over large distances.
The S7-1500R/H redundant system is scalable. In other words, the S7-1500R and S7-1500H
systems have the same functional scope, but differ in terms of:
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Performance
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Hardware
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Range
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Configuration limits
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Costs
S7-1500R
You connect the CPUs to the Industrial Ethernet over X2 PROFINET interfaces of CPUs S7-
1515R-2 PN or using an additional switch.
S7-1500R supports the following number of PROFINET devices (switches, S7-1500R/H
CPUs, S7-1500 CPUs (V2.5 or later), HMI devices, and IO devices such as ET 200MP and
ET 200SP):
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In the PROFINET ring: max. 50 (recommended: max. 16)
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In the PROFINET ring and separated with switches (line): max. 66
Note
Recommendation for S7-1500R: Operate a maximum of 16 PROFINET devices (including
R-CPUs) in the PROFINET ring.
The number of devices in the PROFINET ring affects the availability of the S7-1500R
system. You should therefore operate no more than 16 PROFINET devices (including R-
CPUs) in the PROFINET ring. Operating significantly more devices in the PROFINET ring
will reduce the availability of the IO devices and the R-CPUs.
The technical specifications in the documentation are based on the recommended maximum
of 16 PROFINET devices in the ring in S7-1500R.
Summary of Contents for Simatic S7-1500H
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