System overview
4.10 Connection elements and system cabling
Automation system
System Manual, 01/2023, A5E03461182-AK
99
Using a SITOP power supply as an alternative to a load power supply
Alternatively, an external 24 V power supply from the SITOP range
(https://mall.industry.siemens.com/mall/en/WW/Catalog/Products/10008864) (SITOP smart or
SITOP modular) can be used:
• For higher output currents and 1-phase or 3-phase infeed
• With redundant installation
(https://support.industry.siemens.com/cs/ww/de/view/109768676/en) of the 24 V power
supply as protection against failure of a power supply unit
• With buffering of the 24 V power supply (e.g. with DC UPS) as protection against power
failure
• With selective monitoring of 24 V loads as protection against overload or short-circuit
4.10 Connection elements and system cabling
Front connector and shield contact
The front connectors are used to wire the I/O modules. For modules with EMC-critical signals,
such as analog modules and technology modules, the front connectors also need a shield
contact.
The front connectors are available for 35 mm modules optionally with screw terminals and
push-in terminals and for 25 mm modules with push-in terminals. The front connectors for
25 mm modules are included in the scope of delivery of the I/O modules.
24 V DC is supplied, for example, via a plug-in infeed element for analog modules.
The shield contact consists of shield bracket and shield terminal. Together with the shield
terminal, the shield bracket allows the low-impedance, module-level connection of cable
shields with minimum installation times. The shielding takes place without tools.
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