Verify Your System Power - Allen-Bradley 1769-PA2 Installation Instructions Manual

Compact I/O Expansion Power Supplies
2. Press the DIN rail mounting area of the module against the DIN rail.
The latches momentarily open and lock into place. The following illustration shows a
power supply being attached to the I/O modules in a DIN rail mounted Compact I/O
system.
1769 Cable

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.
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.
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 Temperature Derating on page 25
2. To do so, compare the current graphs to your totals for the following:
• Total 5V DC
• Total 24V DC
14 Rockwell Automation Publication 1769-IN028C-EN-P - August 2016
for graphs.