Allen-Bradley 1756-L72 Programmable Automation Controller (PAC)

Allen-Bradley 1756-L72: A Versatile Programmable Automation Controller (PAC)

Overview

The Allen-Bradley 1756-L72 is a high-performance programmable automation controller (PAC) from the ControlLogix series. Designed for industrial automation applications, this controller offers a wide range of features and capabilities, making it ideal for a variety of process control and monitoring tasks.

Key Features

1. Robust Memory Configuration:
   • User Memory: The 1756-L72 comes with 4 MB of user memory dedicated to data and logic processing.
   • I/O Memory: Additionally, it provides 0.98 MB of I/O memory for handling input and output signals.
   • SD Card Storage: The controller includes a 1 GB SD card (1784-SD1) for optional non-volatile memory storage. This can be upgraded to 2 GB using the 1784-SD2 card. Rockwell Automation recommends using only SD cards sold by Rockwell Automation to ensure compatibility and avoid data loss or corruption.
2. Redundant Controller Support:
   • When paired with similar controllers and located within the same ControlNet network, the 1756-L72 supports controller redundancy. This feature enhances system reliability by providing a backup controller that can take over in the event of a failure.
3. Modular Design:
   • The 1756-L72 features a modular design that allows for easy expansion and customization. It includes three capacitor energy storage modules:
     • 1756-ESMCAP/1756-ESMCAPK: These are removable modules available in each controller.
     • 1756-ESMNSE/1756-ESMNSEK: Another removable module, but it does not have remaining WallClockTime backup power.
     • 1756-ESMNRM/1756-ESMNRMK: This is the only non-removable module, which helps prevent USB connections and the use of SD cards to protect the controller.
4. Communication Options:
   • The controller supports a variety of communication protocols, including Data Highway Plus, DeviceNet, Ethernet/IP, Remote I/O, SynchLink, ControlNet, and third-party process and device networks. This ensures seamless integration with a wide range of industrial devices and systems.
5. Display and Connectivity:
   • The 1756-L72 features a full-speed USB 2.0 port for easy connectivity with external devices.
   • It also includes a 4-character alphanumeric display for monitoring the controller’s current status.
6. Environmental Specifications:
   • The controller is designed to operate within a temperature range of 0 to 60 degrees Celsius and can be stored at temperatures ranging from -40 to 85 degrees Celsius.
   • It has a power consumption of 2.5 watts and a thermal dissipation of 8.5 BTU/hour.
   • The controller can withstand vibrations of up to 2 G at frequencies between 10 and 500 Hz and has an operating shock rating of 30 G and a non-operating shock rating of 50 G.

Compatible Chassis

The Allen-Bradley 1756-L72 is compatible with a range of ControlLogix chassis, including:

• 1756-A4, 1756-A4K
• 1756-A7, 1756-A7K
• 1756-A10, 1756-A10K
• 1756-A13, 1756-A13K
• 1756-A17, 1756-A17K

Applications

Due to its versatile features and robust design, the Allen-Bradley 1756-L72 is suitable for a wide range of industrial automation applications, including process control, manufacturing, and machinery control systems.

Conclusion

In summary, the Allen-Bradley 1756-L72 is a high-performance programmable automation controller that offers a wide range of features and capabilities. With its robust memory configuration, support for controller redundancy, modular design, versatile communication options, and environmental specifications, the 1756-L72 is an ideal choice for industrial automation applications requiring precise and reliable control.