Siemens Simatic S7-1500 / ET 200MP - Special Considerations for the Use of a System Power Supply in the First Power Segment

Application planning
5.2 System and load power supply
Automation system
System Manual, 01/2023, A5E03461182-AK
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5.2.2 Special considerations for the use of a system power supply in the first
power segment
Infeed options
There are three options for the infeed of the required system voltage in the backplane bus:
• Infeed via CPU/interface module
• Infeed via CPU/interface module and system power supply
• Infeed only via system power supply in slot 0
Infeed via CPU/interface module
Infeed via the CPU/interface module generally suffices for small and medium hardware
configurations. The power consumption of the connected modules must not exceed the
power supplied by the CPU/interface module.
In this configuration variant, supply the CPU/interface module with 24 V DC from a load
current supply.
Procedure
To set up the supply by means of the CPU/interface module, follow these steps:
1. Open the "Properties" tab of the CPU/interface module in STEP 7 and select the "System
power supply" in the navigation.
2. Select the option "Connection to supply voltage L+".
Figure 5-6 Supply voltage via CPU/interface module only
Infeed via CPU/interface module and system power supply
For larger hardware configurations, infeed into the backplane bus by the CPU/interface
module alone no longer suffices. If the modules consume more power in total than the
power supplied by the CPU/interface module, you must insert an additional system power
supply.
Supply the system power supply with the permissible supply voltage and the CPU/interface
module with 24 V DC.
Both the system power supply and the CPU/interface module feed current into the backplane
bus. The supplied power is summed.
Power addition: "Infeed power of the system power supply" + "Infeed power of the
CPU/interface module"