System overview
2.5 Power supply
S7-1500R/H redundant system
46
System Manual, 10/2018, A5E41814787-AA
2.4.3
HMI devices
HMI devices are used for machine-level process visualization and control. You use the same
HMI devices for the S7-1500R/H redundant system as for the standard S7-1500 system.
Using HMI communication, one or more HMI devices exchange data with the CPUs (for
example HMI Basic/Comfort/Mobile Panel).
The connection of the HMI device to the redundant system depends on the specific
application. In STEP 7, you can configure the following communication options:
●
The HMI device communicates with the redundant system over the system IP address.
●
The HMI device communicates with the R/H-CPUs (for example for diagnostics purposes)
over the device IP addresses.
Reference
You can find additional information on using HMI devices in the section Using HMI devices
(Page 92) and in the Communication function manual
https://support.industry.siemens.com/cs/ww/en/view/59192925
You can find an overview of all available HMI devices in the Industry Mall
https://mall.industry.siemens.com/mall/en/WW/Catalog/Products/9109999?tree=CatalogTre
2.5
Power supply
The CPUs of the redundant system have an integrated system power supply. It provides the
necessary power to the backplane bus. You can add one load power supply or one system
power supply each to the integrated system power supply.
The table below sets out the key differences between load power supplies (PM) and system
power supplies (PS).
Table 2- 7
Differences between load and system power supplies
Power supply
Description
Load power supply (PM)
The load power supply (PM) supplies the system components, such as the CPU and
system power supply (PS). You can install the load power supply directly to the left of
the CPU (without connection to the backplane bus).
Supply of the R/H CPUs with 24 V DC is optional if you supply the voltage for the
backplane bus via a system power supply.
System power supply (PS)
The system power supply (PS) only supplies system voltage required internally. The
system power supply (PS) supplies parts of the module electronics and the LEDs.
Summary of Contents for Simatic S7-1500H
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