User manual

Publication 1768-UM001C-EN-P - November 2007
52 Place 1768 and 1769 Modules
• The 1768 slots are numbered right to left, starting with the controller in
slot 0.
• The 1768 backplane requires one 1768 power supply.
• The 1768-PA3 power supply is a dual input supply that operates in these
ranges:
• 86...265V ac
• 108...132V dc
The 1768-PB3 power supply is a single-input power supply whose power
supply range is 16.8...31.2V dc.
1768 Power Supply
The 1768-PA3 and 1768-PB3 power supplies also offer a 24V dc external
power source. These power supplies require that a 1768 CompactLogix
controller be installed.
• The power supply sends 24V dc to the controller in slot 0.
• The controller converts the 24V dc to 5V dc and 24V dc, and distributes
the power as needed.
– 5V/24V power to 1769 I/O modules on the right side of the
controller
– 5V power to communication or motion modules on the left side of
the controller
The 1768 modules do not have a distance rating to the 1768 power supply.
Place 1768 modules in the 1768 backplane.
1768 Modules
1768
Power
Supply
1769 I/O
Controller sends:
– 5V dc to
1768 modules.
– 5V/24V dc to
1769 I/O modules.