Rockwell Automation Publication 1769-UM011H-EN-P - April 2012 83
Place, Configure, and Monitor I/O Chapter 6
Calculate System Power Consumption
To validate your proposed system, calculate the total 5V DC current and 24V
DC to be consumed.
Validate Placement of I/O Modules
The controller you use determines how many local I/O modules you
can configure.
To validate the proposed placement of I/O modules in your CompactLogix
system, perform this procedure.
Table 19 - I/O Module Power Consumption Calculation Table
Catalog Number Number of
Modules
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)
1769-L31 330 40
1769-L32C 650 40
1769-L32E 660 90
1769-L35CR 680 40
1769-L35E 660 90
Total Current Required
(1)
:
(1) This number must not exceed the power supply current capacity.
Table 20 - Power Supply Current Capacity
Specification Power Supply and Capacity
1769-PA2 1769-PB2 1769-PA4 1769-PB4
Output Bus Current Capacity 0...55 °C (32...131 °F) 2 A at 5V DC and 0.8 A at 24V DC 4 A at 5V DC and 2 A at 24V DC
24V DC User Power Capacity 0...55 °C (32...131 °F) 250 mA (maximum) NA
Table 21 - Controller I/O Support
Controller Supported Local I/O Modules I/O Banks
1769-L35CR 30 3
1769-L35E 30 3
1769-L32C, 1769-L32E and
1769-L31
16 3
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