Siemens CPU 313C Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
5-15
200
400 600 800 1000 1200
1400
Loss of heat in W
20
30
40
50
60
Ambient temperature in °C
1
1
2
3
Figure 5-6 Power loss dissipated
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 Closed cabinet with heat exchanger (heat exchanger size 11/6 (920 mm x 460
mm x 111 mm)
 Cabinet with through-ventilation by natural convection
 Closed cabinet with natural convection and forced ventilation by equipment
fans
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From the diagram we can see that the following ambient temperatures are
obtained for a total power loss of 650 W:
Table 5-6 Choice of cabinets
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Closed with natural convection and forced ventilation
(Curve 3)
Operation not possible
Open with through-ventilation (Curve 2) approx. 38 °C
Closed with heat exchanger (Curve 1) approx. 45 °C
If you install the S7-300 horizontally, you can use the following types of cabinet:
• open, with closed ventilation
• closed, with heat exchanger
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Selection and installation of cabinets

Siemens CPU 313C Specifications

General

MPI Interface	Yes
Number of digital inputs	24
Number of digital outputs	16
Number of analog inputs	4
Number of analog outputs	2
Supply voltage	24 V DC
High-speed counters	Yes
Bit Operations Execution Time	0.1 µs
Word Operations Execution Time	0.2 µs
Power Consumption	5 W
Dimensions (W x H x D)	40 x 125 x 130 mm
Operating Temperature	0 to 60 °C
Communication Interfaces	MPI
Programming Languages	LAD, FBD, STL
Product type designation	CPU 313C
Weight	490 g