Allen-Bradley 1756-L72 ControlLogix Processor | 2 MB, 1756-L7x, Ethernet, 24V DC, 2K I/O

Allen-Bradley 1756-L72 ControlLogix Processor | 2 MB, 1756-L7x, Ethernet, 24V DC, 2K I/O

Allen-Bradley 1756-L72 ControlLogix processor specifications. 2 MB memory, 1756-L7x series, Ethernet, 24V DC, 256K I/O capacity. For advanced industrial automation and control.

Product Overview

The Allen-Bradley 1756-L72​ is a ControlLogix programmable automation controller (PAC)​ from the 1756-L7x series, designed for advanced industrial automation and control applications. This processor features 2 MB of user memory, EtherNet/IP and CIP Sync capabilities, and operates on 24V DC power. The "1756" designation indicates the ControlLogix series, "L72" specifies the 7x series with 2 MB memory configuration. This controller provides robust, high-performance control for complex automation tasks, supporting motion control, process applications, and high-speed discrete control in a single platform.

Technical Specifications

Note: Specifications are based on Allen-Bradley 1756-L7x series technical documentation. The "1756-L72" model specifically indicates 2 MB memory configuration. Actual specifications may vary slightly depending on firmware version and production batch.

Model Number Decoding (1756-L72)

• 1756:​ Series designation (ControlLogix series)

• L72:​ Processor model (L7 = 1756-L7x series, 2 = 2 MB memory)

Note:​ The "L7" prefix indicates the third generation ControlLogix processor family. The "2" suffix specifically identifies 2 MB of user memory. This processor is part of a scalable family where memory size is the primary differentiator (L71=1.5MB, L72=2MB, L73=3MB, L74=8MB, L75=16MB).

Key Features

• 2 MB User Memory:​ 2,097,152 bytes for program, data, and I/O configuration

• Integrated Ethernet Port:​ 10/100 Mbps EtherNet/IP with dual IP address support

• CIP Motion & CIP Sync:​ Native support for synchronized motion control

• USB Programming Port:​ High-speed configuration and programming

• Real-Time Clock:​ Battery-backed for time-stamped events and data logging

• High-Speed Processing:​ Advanced RISC processor for fast scan times

• Large I/O Capacity:​ Supports up to 128,000 digital or 4,000 analog points

• Motion Integration:​ Can control up to 32 axes with 1756-M modules

• Security Features:​ Program and data protection capabilities

• Industrial Protocols:​ Native support for EtherNet/IP, CIP, and other industrial networks

• Global Certifications:​ Approved for use in hazardous locations and marine applications

Memory Configuration

Communication Capabilities

Typical Applications

• Complex Machine Control:​ High-speed packaging, converting, and assembly machines

• Process Automation:​ Batch processing, continuous process control

• Motion Control:​ Multi-axis coordinated motion systems

• Material Handling:​ AS/RS, conveyor systems, robotic cells

• Energy Management:​ Power monitoring and distribution control

• Water/Wastewater:​ Plant-wide process control and SCADA

• Automotive Manufacturing:​ Production line and test system control

• Food & Beverage:​ Processing and packaging line control

• Pharmaceutical:​ Batch process and clean room control

Important Technical Notes

1. System Requirements:​ Requires ControlLogix chassis (1756-A4, A7, A10, A13, A17) and power supply. Must be installed in any slot except the rightmost slot (reserved for communication modules).

2. Memory Planning:​ 2 MB memory is suitable for medium complexity applications. Consider program size, data requirements, and I/O count when selecting.

3. Network Configuration:​ The integrated Ethernet port supports multiple IP addresses and network topologies. CIP Sync requires proper network configuration for motion applications.

4. Battery Maintenance:​ Replace lithium battery (1756-BA2 or BA3) every 3-5 years or when battery LED indicates low voltage.

5. Programming Software:​ Requires Studio 5000 Logix Designer software for programming and configuration. Firmware updates available via Rockwell Automation website.

6. I/O Configuration:​ Supports local, remote, and distributed I/O via 1756, 1794, 1734, and 1715 series modules.

7. Security:​ Implement proper security measures including program protection, network security, and physical access control.

8. Firmware Compatibility:​ Ensure firmware revision is compatible with I/O modules, communication modules, and Studio 5000 software version.

Note: For complete installation guidelines, wiring diagrams, programming instructions, and detailed technical data, consult the official Allen-Bradley ControlLogix 1756-L7x Controllers User Manual. Always verify the exact model number and firmware configuration with the manufacturer.