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Siemens Simatic S7-300 CPU 31xC Series User Manual

Siemens Simatic S7-300 CPU 31xC Series
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S7-300 components
3.2 Overview of the vital modules of an S7-300
S7-300, CPU 31xC and CPU 31x: Installation
3-2 Operating Instructions, Edition 08/2004, A5E00105492-05
3.2 Overview of the vital modules of an S7-300
You can choose from a number of modules for installing and commissioning the S7-300. The
most important modules and their functions are shown below.
Table 3-1 S7-300 components:
Component Function Illustration
Mounting rail
Accessories:
Shielding terminal
S7-300 racks
Power supply (PS) module The PS converts the line voltage
(120/230 VAC) into a 24 VDC operating
voltage, and supplies the S7-300 and
its 24 VDC load circuits.
SIEMENS
A CPU 31xC, for example
SIEMENS
A CPU 312, 314, or 315-2 DP, for
example
CPU
Accessories:
Front connectors (CPU 31xC only)
The CPU executes the user program,
supplies 5 V to the S7-300 backplane
bus, and communicates with other
nodes of an MPI network via the MPI
interface.
Additional features of specific CPUs:
DP master or DP slave on a
PROFIBUS subnet
Technological functions
PtP communication
Ethernet communication via
integrated PROFINET interface
A CPU 317, for example

Table of Contents

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Siemens Simatic S7-300 CPU 31xC Series Specifications

General IconGeneral
SeriesS7-300 CPU 31xC
Power Supply24 V DC
Communication InterfacesMPI, PROFIBUS DP
Programming LanguagesLAD, STL, FBD, SCL
Operating Temperature0°C to +60°C
Memory48 KB - 512 KB
Dimensions40 x 125 x 130 mm (varies by model)

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