Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 233
Appendix D
Choose a Correct Power Supply
Use the chart to determine the power your ControlLogix chassis is using to 
prevent an inadequate power supply. We recommend that you use this worksheet 
to check the power supply of each ControlLogix chassis used.
Slot 
Number
Module 
Cat. No.
Current @
5.1V DC (mA)
Power @ 
5.1V DC (Watts)
Current @ 
24V DC (mA)
Power @
24V DC (Watts)
Current @ 
3.3V DC (mA)
Power @ 
3.3V DC (Watts)
0 x 5.1V = x 24V = x 3.3V =
1 x 5.1V = x 24V = x 3.3V =
2 x 5.1V = x 24V = x 3.3V =
3 x 5.1V = x 24V = x 3.3V =
4 x 5.1V = x 24V = x 3.3V =
5 x 5.1V = x 24V = x 3.3V =
6 x 5.1V = x 24V = x 3.3V =
7 x 5.1V = x 24V = x 3.3V =
8 x 5.1V = x 24V = x 3.3V =
9 x 5.1V = x 24V = x 3.3V =
10 x 5.1V = x 24V = x 3.3V =
11 x 5.1V = x 24V = x 3.3V =
12 x 5.1V = x 24V = x 3.3V =
13 x 5.1V = x 24V = x 3.3V =
14 x 5.1V = x 24V = x 3.3V =
15 x 5.1V = x 24V = x 3.3V =
16 x 5.1V = x 24V = x 3.3V =
Tot al s mA W (1) mA W (2) mA W (3)
This number 
cannot exceed the 
following:
10000 mA for 
1756-PA72, 1756-
PB72
13000 mA for 
1756-PA75, 
1756PB75, 1756-
PC75, 1756-PH75
This number 
cannot exceed 
2800 mA
This number 
cannot exceed 
4000 mA
These three wattage values (1, 2, 3), added together, cannot exceed 75 W @ 60 °C (140 °F) for any power supply.