User manual
113 Publication 1768-UM001C-EN-P - November 2007
Appendix
 A
1768 CompactLogix Controller Specifications
Introduction
This appendix contains the specifications for the 1768-L43 and 1768-L45 
CompactLogix controllers. 
1768-L43 and L45 CompactLogix Controllers General Specifications
Controller User 
Memory
Nonvolatile 
Memory
Communication Options Number of Tasks Supported Number of Local I/O 
Modules Supported
1768-L43 2 MB CompactFlash • Maximum of two 1768 modules 
in the 1768 backplane
• EtherNet/IP network
(1768-ENBT and 1768-EWEB 
modules)
• ControlNet network
(1768-CNB and 1768-CNBR 
modules)
• DeviceNet network
(1769-SDN scanner)
• Serial (built-in)
• Modbus via ladder routine
• DH-485
• 16 tasks (only 1 continuous)
• Event tasks: supports 
consumed tag trigger, EVENT 
instruction, axis, and motion 
event triggers
• Max of 16 1769 I/O 
modules (in 3 
banks) in the 1769 
backplane
1768-L45 3 MB CompactFlash • Maximum of four 1768 modules 
in the 1768 backplane
• EtherNet/IP network
(1768-ENBT and 1768-EWEB 
modules)
• ControlNet network
(1768-CNB and 1768-CNBR 
modules)
• DeviceNet network
(1769-SDN scanner)
• Serial (built-in)
• Modbus via ladder routine
• DH-485
• 30 tasks (only 1 continuous)
• Event tasks: supports 
consumed tag trigger, EVENT 
instruction, axis, and motion 
event triggers
Max of 30 1769 I/O 
modules (in 3 banks) in 
the 1769 backplane










