User manual

Publication 1768-UM001C-EN-P - November 2007
Place 1768 and 1769 Modules 53
1769 Module Placement
The CompactLogix controllers support the following:
• 1768-L43, a maximum of 16 local 1769 I/O modules
• 1768-L45, a maximum of 30 local 1769 I/O modules
Follow these guidelines as you place 1769 modules to the right of the 1768
controller:
• Up to eight 1769 modules can be attached to the right of the 1768
system.
• The 1769 I/O modules connected directly to the 1768 controller do not
need a 1769 power supply.
• Additional 1769 modules must be in additional I/O banks.
• Each additional I/O bank must have its own power supply. Use any
1769 power supply.
• Each 1769 module also has a power supply distance rating, which is the
number of modules from the power supply.
• Place up to eight 1769 I/O modules to the left or the right of the 1769
power supply.
• Each additional I/O bank must connect to the main rack by using
standard 1769-CRLx extension cables.
1769 Module Placement Overview
The 1769 slots are numbered left to right, starting with the controller as slot 0.
IMPORTANT
Never put a 1769 power supply in the 1768 backplane. A 1769
power supply in the 1768 backplane causes the controller to
generate a major fault that cannot be cleared until you remove
the 1769 power supply.
IMPORTANT
Each module must be within its distance rating. See the
specifications for the module to determine its distance rating.
Place 1769 I/O modules to
the right of the controller.
1769 I/O
Slot 2Slot 1Slot 0