Specifications

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1768-SG001A-EN-P -- March 2006
CompactLogix Selection Guide
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Follow these guidelines as you place modules in the 1768 backplane:
y The 1768 power supply must be the leftmost module in the 1768 backplane.
y The controller must be the rightmost module in the 1768 backplane.
y As many as two additional 1768 modules can be between the controller and
power supply.
Follow these guidelines as you place 1769 modules to the right of the 1768 backplane:
y As many as eight 1769 modules can be attached to the right of the 1768 system.
y The 1769 I/O connected directly to the 1768 backplane does not need a 1769 power
supply. Never put a 1769 power supply in the 1768 system. Putting a 1769 power
supply in the 1768 system causes the controller to generate a major fault that can not
be cleared until you remove the 1769 power supply.
y Additional 1769 modules must be in additional I/O banks.
y Each additional I/O bank must have its own power supply. Use a standard 1769 power
supply, such as 1769-PA4.