System overview
5.3 S7-1500 R/H-CPUs
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
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for CPU supply voltage
The 4-pin connection plug provides the supply voltage.
(PS)
The system power supply is a diagnostics-capable power sup-
ply module that is connected to the backplane bus.
A system power supply is required when the power fed from
the CPU into the backplane bus is not sufficient to supply the
connected modules with power.
System power supplies are available in different versions:
• PS 25W 24V DC
• PS 60W 24/48/60V DC
• PS 60 W 120/230V AC/DC
A power cable connector with coding element and U-
connector is included in the scope of delivery for the system
power supply and can be ordered as spare part.
(PM)
The load current supply (PM) supplies the central modules
(CPU) with 24 V DC.
If you are using load current supplies, we recommend the
devices from the SIMATIC series. These devices can be mount-
ed on the rail.
Load current supplies are available in different versions:
• PM 70 W 120/230 V AC
• PM 190 W 120/230 V AC
5.3 S7-1500 R/H-CPUs
The S7-1500R/H redundant system tolerates the failure of one of the two R- or H-CPUs. If the
primary CPU fails, the backup CPU takes over control of the process as the new primary CPU
at the point of the interruption.
All relevant data is permanently synchronized between the CPUs over the redundancy
connections between primary CPU and backup CPU.
The primary CPU and the backup CPU execute the user program in parallel.
The display of the CPU shows you the control and status information in various menus. Quick
access to diagnostic alarms minimizes plant downtimes in the event of a service call.
For effective commissioning and fast optimization of drives and controls, the CPUs support
trace functions for all CPU tags.
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