Siemens Simatic S7-300 CPU 31xC Series User Manual

Configuring
4.10 Selecting the load power supply
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4-27
Example: S7-300 with load power supply from PS 307
The figure below shows the overall S7-300 configuration (load power supply unit and
grounding concept), with TN-S mains supply. The PS 307 supplies the CPU and the load
current circuit of the 24 VDC modules.
Note
The layout of the power connections does not correspond with their physical arrangement; it
was merely selected to give you a clear overview.
1
0
/
0
36
6 &38
w3
/
/
/
1
3(
60
5DLO
/RZYROWDJHGLVWULEXWLRQ
HJ716V\VWHP[9
(TXLSRWHQWLDOEXVOLQH
LQWKHFDELQHW
2QORDGSRZHUFLUFXLWV
'&9IRU'&PRGXOHV
/
6LJQDOPRGXOHV
&DELQHW
Example: S7-300 with load power supply from PS 307

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)