1756-L72K Controller | Allen-Bradley Logix5572 CPU

Allen-Bradley 1756-L72K ControlLogix Logix5572 Processor Module

Product Introduction

The Allen-Bradley 1756-L72K is a high-performance processor module from the ControlLogix family. It belongs to the Logix5572 series of programmable automation controllers. This module stands out with its conformal coating, which provides superior protection against moisture, dust, and chemical contaminants. Therefore, the 1756-L72K is an excellent choice for harsh industrial environments. It delivers 4 MB of user memory for extensive logic and data storage. Additionally, it offers 0.98 MB of I/O memory for efficient input and output management. The controller supports a wide range of communication networks and protocols. Consequently, it integrates seamlessly into diverse automation architectures. Furthermore, the 1756-L72K includes a built-in USB 2.0 port operating at 12 Mbps for convenient programming access.

Technical Specifications

The 1756-L72K controller comes equipped with 4 MB of standard user memory. It also features 0.98 MB of I/O memory for handling input and output operations. The controller supports a maximum total I/O count of 128,000 points. Moreover, it can manage up to 4,000 analog I/O points and 128,000 digital I/O points. The module draws 5 mA at 1.2 Volts DC and 800 mA at 5.1 Volts DC from the backplane. Its power dissipation is 2.5 Watts, translating to 8.5 BTU/hr of thermal dissipation. Meanwhile, the continuous isolation voltage is rated at 30 Volts. The enclosure is open-style, designed for installation within a protected control cabinet. Besides that, the 1756-L72K weighs approximately 0.55 pounds (0.25 kilograms) , making it lightweight and easy to handle.

Conformal Coating Protection

The 1756-L72K distinguishes itself with its conformal coating feature. This protective layer covers the module's circuit board and components. Specifically, the conformal coating shields the controller from moisture, dust, chemicals, and temperature extremes. Therefore, this module is ideal for applications in food processing, chemical plants, and outdoor installations. The coating also provides additional resistance against vibration and thermal shock. Moreover, it extends the operational lifespan of the 1756-L72K in demanding conditions. Users can rely on this controller for consistent performance where standard modules might fail. This feature makes the 1756-L72K a preferred choice for engineers designing resilient control systems.

Communication Capabilities

The 1756-L72K offers extensive communication options for versatile system integration. It includes a built-in USB 2.0 port operating at full speed (12 Mbps) for programming and diagnostics. For network communication, the controller supports multiple industrial protocols. Specifically, it works with EtherNet/IP, ControlNet, and DeviceNet networks. Additionally, it supports Data Highway Plus, Remote I/O, and SynchLink for legacy system integration. The 1756-L72K also interfaces with third-party process and device networks through compatible modules. This versatility ensures the controller fits into virtually any industrial network architecture. Furthermore, the module can support up to 250 controller connections for extensive system networking. Users can choose the most suitable communication method for their specific application requirements.

Compatible Chassis and Power Supplies

The 1756-L72K is a chassis-based module designed for the 1756 ControlLogix chassis family. Compatible chassis include standard and conformally-coated (K-rated) models. Specifically, these are the 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K, 1756-A17, and 1756-A17K. The controller can be installed in any slot of the chassis. Moreover, multiple controllers can also be installed in the same chassis for distributed control. For power supply, the module works with standard ControlLogix power supplies. Compatible power supplies include the 1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, and 1756-PB75K. Users should ensure the power supply can handle the combined current draw of all modules in the chassis. Therefore, proper power budgeting is essential for reliable system operation.

Mechanical and Environmental Parameters

The 1756-L72K operates within a temperature range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) . For storage, it can withstand temperatures from -40 to 85 degrees Celsius. The controller functions reliably in environments with 5 to 95% relative humidity (non-condensing) . Additionally, it can endure operational vibration of 2g at 10 to 500 Hz. Moreover, it has an operational shock tolerance of 30g and a non-operational shock tolerance of 50g. The conformal coating enhances the module's resistance to environmental stressors. These robust specifications make the 1756-L72K suitable for challenging industrial conditions. The open-style enclosure requires installation in a pollution degree 2 environment. Besides that, proper ventilation should be ensured to maintain optimal operating temperatures.

Programming and Tasks

The 1756-L72K supports multiple programming languages to suit various application needs. Supported languages include Relay Ladder Logic, Structured Text, Function Block Diagram (FBD) , and Sequential Function Chart (SFC) . The controller can handle up to 32 tasks concurrently. Furthermore, each task can contain up to 100 programs, allowing for structured and organized code. The controller supports event tasks with all event triggers available. This feature enables immediate response to specific external or internal events. Additionally, the 1756-L72K offers robust processing capabilities for logic and motion control. Users can develop complex automation strategies with this powerful controller. The integrated USB port simplifies program downloads and diagnostic access.

Installation Guidelines

The 1756-L72K processor module can be installed in any slot of a 1756 ControlLogix chassis. Begin installation by ensuring the chassis is properly mounted and grounded. Next, align the module with the card guides in the selected slot. Then, carefully slide the 1756-L72K into the chassis until it is firmly seated. Finally, secure the module by closing the locking latch. The module is hot-swappable, but ensure proper system configuration and safety practices. Users should always verify that the power supply meets the backplane current requirements. The conformal coating requires no special handling during installation. However, users should avoid touching the coated surfaces unnecessarily to preserve the protective layer.

Packaging List

The standard packaging for the Allen-Bradley 1756-L72K ControlLogix processor module includes the following items:

One 1756-L72K ControlLogix Logix5572 processor module with conformal coating.
One product information sheet with installation instructions.
Anti-static packaging to protect the module during transit.
Shipping documentation and packing slip.

Shipping and Delivery

All orders for the 1756-L72K processor module are shipped using premium express couriers. We ship exclusively via FedEx, UPS, and DHL to ensure fast and reliable delivery. Shipping options include express, standard, and economy services. Tracking information will be provided once the order is dispatched.

Frequently Asked Questions (FAQ)

1. What is the conformal coating on the 1756-L72K?
The 1756-L72K features a conformal coating that protects the module from moisture, dust, chemicals, and temperature extremes. This coating makes the controller suitable for harsh industrial environments where standard modules might fail.

2. What is the user memory capacity of the 1756-L72K?
The 1756-L72K has 4 MB of user memory for logic and data storage. It also includes 0.98 MB of dedicated I/O memory for handling input and output operations.

3. What communication networks does the 1756-L72K support?
The 1756-L72K supports EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, and SynchLink. It also includes a built-in USB 2.0 port for programming and diagnostics.

4. What chassis are compatible with the 1756-L72K?
The 1756-L72K is compatible with all standard and K-rated 1756 ControlLogix chassis, including the 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17 models and their K-rated equivalents.

5. What is the maximum I/O supported by the 1756-L72K?
The 1756-L72K supports a maximum total I/O of 128,000 points. This includes 128,000 digital I/O and 4,000 analog I/O points.