Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 206)

Technical data of CPU 31x
7.7 CPU 317-2 PN/DP
CPU 31xC and CPU 31x, Technical data
7-40
Manual, Edition 08/2004, A5E00105475-05
Technical data
Voltages and currents
Power supply (rated value) 24 VDC
• Permitted range 20.4 V to 28.8 V
Current consumption (no-load operation) 100 mA
Inrush current Typically 2.5 A
I 2 t Min. 1 A 2 s
External fusing of power supply lines
(recommended)
min. 2 A
Power loss Typically 3.5 W