10 Rockwell Automation Publication 1769-IN028C-EN-P - August 2016
Compact I/O Expansion Power Supplies
Assemble the System
1769 Compact I/O power supplies distribute power from either side of the power supply.
The maximum amount of current the system supports in both directions is:
• 1769-PA2, 1769-PB2: 2 amps at 5V DC; 1 amp at 24V DC
• 1769-PA4, 1769-PB4: 4 amps at 5V DC; 2 amps at 24V DC
The power supply can be attached to an adjacent I/O module before or after
mounting.
EXAMPLE A 2 amp at 5V DC power supply (1769-PA2, 1769-PB2) can provide 1 amp to the right side of
the power supply and 1 amp to the left. A 4 amp at 5V DC power supply (1769-PA4 and
1769-PB4) can provide 2 amps to the right side of the power supply and 2 amps to the left.
IMPORTANT The maximum amount of current that can be distributed from either side of any 1769 power
supply is 2 amps at 5V DC and 1 amp at 24V DC.
This condition is a limit of the 1769 Compact I/O Bus.
Power Supply and Adjacent Module Components
Item Description
1 Upper and lower tongue-and-groove slots
2 Bus connectors
3 Positioning tab
4 Direction of the bus lever of the power supply to the I/O modules
5End cap terminator
6 End cap bus terminator
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