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

3.7.5
Determining the Power
Dissipation of Modules
System Manual
C79000-B8576-C199-03
Selection and Installation of Cabinets with SIMATIC S5
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
consump-
tion
CP 143 Current 4A/5V
consump- 0.5A/15V
tion 0.04A/24V
IM 304 Current 1.5A/5V
consump-
tion
→ Power dissipation
= 25 W
→ Power dissipation
approx. 21 W
→ Power dissipation
= 7.5 W
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