System overview
5.5 Power supply
S7-1500R/H redundant system
124 System Manual, 01/2024, A5E41814787-AF
5.5 Power supply
The R/H CPUs of the redundant system have an integrated system power supply. You can
supplement the integrated system power supply with a system power or load current supply.
System power supply (PS)
The system power supply only provides internally required system voltage and supplies the
communications processors.
Load power supply (PM)
The load power supply (PM) supplies the system components, CPU, and the communications
processors. You can install the load current supply directly to the left of the CPU (without
connection to the backplane bus).
The CPUs are designed for fixed operation and continuous operation on a system power or
load current supply.
System power supply modules
System power supplies supply the internal electronics of the S7-1500R/H modules with power
via the backplane bus. The table below shows the available system power supply modules:
24 V DC, 48 V DC, 60 V DC
120 V AC, 230 V AC
120 V DC, 230 V DC
from the backplane
Energy buffering for
data backup in the CPU
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