Installation Guidelines

3.7.5Determining the Power Dissipation of Modules

The power dissipation of the modules can be found in the technical specifications of the catalogs or manuals. If these values are not yet incorporated in the technical specifications, they can be easily calculated from the current consumption. The value of current consumption must be multiplied by the corresponding voltage value.

Examples

CPU 928B

Current

5A/5V

 

consumption

 

 

 

 

CP 143

Current

4A/5V

 

consumption

0.5A/15V

 

 

0.04A/24V

 

 

 

IM 304

Current

1.5A/5V

 

consumption

 

 

 

 

ÙPower dissipation = 25 W

ÙPower dissipation approx. 21 W

ÙPower dissipation = 7.5 W

System Manual

3-39

C79000-G8576-C199-06

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Image 65
Siemens S5-135U/155U appendix Determining the Power Dissipation of Modules, Examples