Determining The Power Dissipation Of Modules - Siemens S5-135U/155U System Manual

3.7.5

Determining 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
CP 143
IM 304
System Manual
C79000-G8576-C199-06
5A/5V
consumption
Current 4A/5V
consumption 0.5A/15V
0.04A/24V
Current 1.5A/5V
consumption
Installation Guidelines
Power dissipation = 25 W
Power dissipation
approx. 21 W
Power dissipation = 7.5 W
3-39