Publication 1756-UM001G-EN-P - January 2007
ControlLogix System Overview 13
The ControlLogix controller divides resources between a Logix CPU
and a backplane CPU.
Logix CPU and Backplane CPU
• The Logix CPU executes application code and messages.
• The backplane CPU communicates with I/O and sends and
receives data from the backplane. This CPU operates
independently from the Logix CPU, so it sends and receives I/O
information asynchronous to program execution.
Design
When you design a ControlLogix system, select:
• I/O devices.
• motion control and drives requirements.
• communication modules.
• controllers.
• chassis.
• power supplies.
• software.
Install Hardware
To install a ControlLogix controller:
• install memory options.
– on a 1756-L55, install a memory board for additional memory.
– on a 1756-L6x, install a 1784-CF64 CompactFlash card for
nonvolatile memory.
See the chapter Maintain Nonvolatile Memory.
• connect the battery.
See the chapter Maintain the Battery.
• install the controller in the chassis.
Logic and Data Memory
Logix
CPU
Backplane
CPU
I/O Memory
Program Source Code
Tag Data
RSLinx Tag Group Lists
I/O Data
I/O Force Tables
Message Buffers
Produced/consumed Tags
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