244 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 9 Use I/O Modules with CompactLogix 5370 L3 Controllers
Calculate Power Consumption in Single Bank
Use Tab le 30 to calculate power consumption in one bank.
IMPORTANT One bank requires the CompactLogix 5370 L3 controllers to reside in the
leftmost slot. At minimum, you must calculate the power consumption of
the controller on the left side of the power supply.
If more modules are installed on the left side of the power supply, you must
calculate the power consumption for those modules as well.
If more modules are installed to the right of the power supply, you must
calculate the power consumption for that side separately.
Table 30 - Module Power Consumption Calculation for a Local Bank
Side of Power
Supply
Device Cat. No. Number of
Modules
(3)
Module Current Requirements Calculated Current =
(Number of Modules) x (Module
Current Requirements)
at 5V DC (in mA) at 24V DC (in mA) at 5V DC (in mA) at 24V DC (in mA)
Left - Required
1769-L30ER
1769-L30ERM
1769-L30ER-NSE
1769-L33ER
1769-L33ERM
1769-L36ERM
1769-L37ERM
1769-L37ERMK
1769-L38ERM
1769-L38ERMK
1 500 225 500 225
Left - Optional I/O Module-specific Up to 3 Module-specific Module-specific
Total Current Required
(2)
:
Right I/O Module-specific
IMPORTANT: Insert a separate row in this
calculation for each I/O module.
Up to 8 Module-specific Module-specific
Total Current Required
(2)
:
Total Current Required for Single Bank if Modules Are Installed on Both Sides of the Power Supply
(1)
:
(1) This number must not exceed the power supply current capacity for the bank.
(2) This number must not exceed the power supply current capacity for this side of the bank.
(3) In the local bank, you can only install up to three modules to the left of the power supply. This limitation is because the CompactLogix 5370 L3 controllers have a power supply distance rating of four
and must be within four slots of the Compact I/O power supply. On the right side of the power supply in the local bank and both sides of the power supply in more banks, you can install up to eight
modules. This configuration is possible only if the power supply distance ratings for the modules validate the system design.
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