Siemens Simatic S7-300 CPU 31xC Series User Manual

Wiring
6.3 Adjusting the power supply module to local mains voltage
S7-300, CPU 31xC and CPU 31x: Installation
6-4 Operating Instructions, Edition 08/2004, A5E00105492-05
6.3 Adjusting the power supply module to local mains voltage
Introduction
You can operate the S7-300 power supply module on 120 VAC or 230 VAC. The default
setting for the PS 307 is 230 VAC.
Mains voltage selector switch adjusting
Verify that the setting of the voltage selector switch matches your local mains voltage.
To set the selector switch:
1. Remove the protective cap with a screwdriver.
2. Set the selector switch to match the local line voltage.
3. Reinsert the protective cap.
CPU
PS
21
22
Key to numbers in the figure
(1) Remove the protective cap with a screwdriver
(2) Set selector switch to mains voltage

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)