Power Balance Calculation - Siemens SIMATIC S7-1500 System Manual
Redundant system
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Also See for SIMATIC S7-1500:
- Function manual (402 pages) ,
- System manual (393 pages) ,
- Manual (188 pages)
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Application planning
6.8 System power supply
6.8.2
Power balance calculation
Principle of power segment overview
In order to ensure the supply of the modules from the backplane bus, the power segment
overview compares the infeed power with the required power for the modules. The supplied
power of all system power supplies including the CPU 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 from the CPU and system power supply is listed in the
technical data of the CPU in the corresponding manuals.
The power consumed from the backplane bus by a communications processor or the CPU can
be found in the technical specifications in the corresponding manuals.
The power segment overview is performed:
• When configuring with STEP 7
• During operation by the CPU
Power segment overview when configuring with STEP 7
STEP 7 checks compliance with the power balance during the configuration.
Proceed as follows to evaluate the power segment overview:
1. Perform configuration of the S7-1500R/H with all the required modules.
2. In the network view, select the CPU or the system power supply.
3. Open the "Properties" tab in the inspector window.
4. Select the "System power supply" entry in the area navigation.
5. Check the "Power segment overview" table, so see whether the power balance is positive. If
the power balance is negative, STEP 7 marks the underpowered modules in red.
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S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
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