Siemens Simatic S7-300 CPU 31xC Series User Manual

S7-300 components
3.2 Overview of the vital modules of an S7-300
S7-300, CPU 31xC and CPU 31x: Installation
3-4 Operating Instructions, Edition 08/2004, A5E00105492-05
Component Function Illustration
RS 485 repeater The repeater is used to amplify the
signals and to couple segments of an
MPI or PROFIBUS subnet.
Switch A switch is used to interconnect the
Ethernet nodes.
Twisted-pair cables with RJ45
connectors.
Interconects devices with Ethernet
interface (a switch with a
CPU 317-2 PN/DP, for example)
Programming device (PG) or PC with
the STEP 7 software package
You need a PG to configure, set
parameters, program and test your
S7-300

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)