Application planning
5.3 Power balance calculation
Automation system
System Manual, 01/2023, A5E03461182-AK
121
5.3 Power balance calculation
Principle of power balance calculation
In order to ensure the supply of the modules from the backplane bus, the power balance
calculation compares the infed power with the required power for the modules. The supplied
power of all system power supplies including the CPU/interface module must be greater than
or equal to the power taken from the modules.
In order to operate the configuration with its used modules, the power balance must be
positive for each power segment in use.
This means that the power fed into the power segment is greater than the power consumed
by the modules.
Take care even during planning, that the power fed into the backplane bus is always greater
than or equal to the power drawn. The TIA Selection Tool
(https://new.siemens.com/global/en/products/automation/topic-areas/tia/tia-selection-
tool.html) aids you during planning.
The power fed into the backplane bus by the CPU/interface module and system power supply
is listed in the technical specifications of the CPU/interface module in the corresponding
manuals.
The power consumed from the backplane bus by an I/O module or the CPU/interface module
can be found in the technical specifications in the corresponding manuals.
The power balance calculation is performed:
• When configuring with STEP 7
• During operation by the CPU
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