Rockwell Automation Publication 1769-IN028I-EN-P - July 2020 13
Compact I/O Expansion Power Supplies
Verify Your System Power
Your system power budget is a consideration when using 1769 power supplies. This budget
determines the power that is being provided to the I/O modules. See Power Supply Distance
Ratings in the CompactLogix™ System Selection Guide, publication 1769-SG001
, for the power
requirements.
1. After you have reviewed the amount of current consumed by your system, verify that
your power supply has adequate capacity for its bank of I/O modules.
See Temp e r a t ure D e r a ti n g
on page 24 for graphs.
2. To do so, compare the current graphs to your totals for the following:
•Total 5V DC
• Total 24V DC
• Total 24V DC sensor power (1769-PA2, 1769-PA2K only)
3. If your power supply load is at or above the limits of the allowable ranges that are shown
in the graphs, you must add an additional I/O bank.
See Connect the Power Supplies
on page 18 for additional information.
TIP The total number of I/O modules cannot exceed 16 on one bank with a maximum of 8 I/O
modules on either side of the power supply.
You system can be used in a maximum of two banks of I/O modules. This condition occurs
when you configure your system with a MicroLogix™ 1500 controller, one expansion cable,
one expansion power supply, and a total of eight I/O modules. The expansion power supply
cannot be directly connected to the MicroLogix 1500 controller.
IMPORTANT An additional I/O bank must include its own power supply.
An end cap/terminator (1769-ECR or 1769-ECL) must also be used if the I/O bank is the last in
the system.
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