The 1756-L72 is a specific model of a ControlLogix programmable automation controller (PAC) manufactured by Allen-Bradley (Rockwell Automation).

Here are some key features and specifications of the Allen-Bradley 1756-L72 ControlLogix PAC:

1. Processor: The 1756-L72 is equipped with a powerful processor capable of executing control programs and handling communication tasks within an industrial automation system.

2. Memory: The controller has a significant amount of memory available for storing program logic, data, and configuration information. It typically includes both non-volatile memory (for program storage) and RAM (for temporary data storage).

3. Communication: The 1756-L72 supports various communication protocols, such as EtherNet/IP, ControlNet, and DeviceNet, allowing for integration with a wide range of devices and networks.

4. I/O Modules: The ControlLogix system, including the 1756-L72 controller, utilizes input/output (I/O) modules for connecting to a wide array of field devices. These modules can include digital inputs, digital outputs, analog inputs, analog outputs, and specialty I/O modules.

5. Programming and Configuration: The 1756-L72 controller can be programmed and configured using Rockwell Automation's Studio 5000 software (formerly known as RSLogix 5000). This software provides a comprehensive development environment for creating control programs, configuring I/O modules, and configuring network communication.

6. Redundancy: The 1756-L72 supports redundant control system configurations, allowing for increased reliability and availability by providing backup controllers that can take over in the event of a primary controller failure.