Use Of Load Power Supplies - Siemens SIMATIC S7-1500 System Manual

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3.3 Use of load power supplies

3.3 Use of load power supplies
Introduction
The system power supply (PS), central modules (CPU), interface module and input and
output circuits of the I/O modules are supplied with 24 V DC by the load current supply (PM).
Load current supplies can be mounted on the mounting rail but do not have a connection to
the backplane bus.
Observe the installation rules and specified installation distances in the manuals of the load
current supplies.
Use of m ultiple load current supplies
Several load current supplies (PM) can be used as follows for higher output currents:
Every load current supply feeds independent 24 V DC load lines.
Alternatively you can use an external 24 V power supply, e.g. from the SITOP line.
Figure 3-9 Supply of the modules from 24 V DC load current suppl
Not e
A lt ernative 24 V s upply of t he modules from t he control c abinet
If safe galvanic isolation (SELV/PELV according to IEC 60364-4-41) is ensured, you can
supply the modules alternatively with 24 V DC from the control cabinet.
Reference
More information on load current supplies can be found on the Internet
(https://mall.industry.siemens.com) in the online catalog and in the online ordering system.
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Automation system
System Manual, 09/2016, A5E03461182-AD