Siemens S7-400PLC Dokumentacja Strona 49

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S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
49
Power supply modules
3
3.1 Common characteristics of the power supply modules
Functions of the power supply modules
The power supply modules of the S7-400 supply the other modules in the rack with their
operating voltages via the backplane bus. They do not provide load voltages for the signal
modules.
Common characteristics of the power supply modules
The power supply modules share the following characteristics in addition to their individual
specifications:
Encapsulated design for use in racks of the S7-400 system
Cooling via natural convection
Plug-in connection of the supply voltage with AC - DC coding
Protection class I (with protective conductor) in accordance with IEC 61140; VDE 0140,
Part 1
Limitation of the inrush current in accordance with NAMUR Recommendation NE 21
Short-circuit-proof outputs
Monitoring of both output voltages. If one of these voltages fails, the power supply
module signals a fault to the CPU.
Both output voltages (5 VDCand 24 VDC) share a common ground.
Primary clocked
Battery backup as option. The parameters set and the memory contents (RAM) are
backed up via the backplane bus in the CPUs and programmable modules. In addition,
the backup battery enables you to carry out a restart of the CPU. Both the power supply
module and the backed up modules monitor the battery voltage.
Operating and fault/error LEDs on the front plate.
NOTICE
A mains disconnecting device must be provided when installing AC power supply
modules.
Switching the line voltage Off/On
The power supply modules have an inrush current limiter in accordance with NAMUR.
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