Appendix B Power-Sizing Chart - Allen-Bradley 1756-IF8I User Manual

Power-sizing Chart
Choose the Correct Power Supply
You can determine the power that modules contained in a ControlLogix® chassis
are consuming to maintain an adequate power supply.
An interactive spreadsheet is available that lets you enter a chassis configuration
and automatically calculates the total power supply consumption. The total
power supply consumption cannot exceed 75 W @ 60 °C (140 °F).
Refer to the configuration spreadsheet in Sizing the ControlLogix Power Supply,
Knowledgebase Technical Note ID
The 5.1V DC and 24V DC currents are used together to calculate the maximum
backplane power dissipation. The following table lists the current draw of
each module.
Cat. No. Current Draw at 5.1V DC
1756-IF8I 200 mA
1756-IRT8I 200 mA
1756-IR12 200 mA
1756-IT16 200 mA
1756-OF8I 200 mA
Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
22753.
Current Draw at 24V DC
• Voltage/Non-sourcing Current mode: 150 mA
• Sourcing Current mode: 400 mA
150 mA
150 mA
80 mA
• Voltage or Current mode with 250 Ω loads = 220 mA
• Current mode with 500 Ω loads = 275 mA
• Current mode with 750 Ω loads = 340 mA
• Current mode with 1000 Ω loads = 385 mA
B
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