334 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Appendix F System Loading
Calculate External AC Power Supply Loading for your Micro830 Controller
To calculate External AC Power Supply Loading:
• Get total sensor current loading. For this example, assume it is 250 mA.
• Calculate Total Power Loading by Sensor using this formula:
(24V * 250 mA) 6 W.
• Derive External AC Power Supply Loading using this formula:
AC Power Supply Loading = Total Power calculated for a Micro800 system with Plug-in
+ Total power loading by Sensor.
As an example, a 48-point Micro850 controller with2 plug-ins, and 2085-IQ16 and 2085-IF4
expansion I/O, and 250 mA sensor current (6 W sensor power) will have the following Total
Loading for AC Power Supply:
Total loading for AC power supply = 17.87 W + 6 W = 23.87 W
ATTENTION: Maximum loading to AC Power Supply is limited to 38.4 W with
maximum surrounding ambient temperature limited to 65 °C (149 °F).
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