The Allen Bradley 1756-L81E is a high-performance ControlLogix processor module designed for advanced industrial automation applications. Part of the Logix5581E family, this processor delivers exceptional processing power, deterministic control, and reliable performance for complex control systems.

With integrated motion, I/O, and network capabilities, the 1756-L81E supports seamless coordination of multiple devices and high-speed communication across industrial networks, including EtherNet/IP and ControlNet. Its advanced memory and processing architecture allow large-scale applications to run efficiently, while maintaining fast scan times and precise execution of control routines.

Engineered for demanding industrial environments, the 1756-L81E offers robust diagnostics, fault tolerance, and energy-efficient operation, minimizing downtime and maximizing system productivity. This module is ideal for applications ranging from manufacturing automation, robotics, and process control to critical infrastructure systems, providing a dependable solution for engineers and system integrators seeking high-performance, scalable, and flexible industrial control.

Specifications:

Electrical & Power

Backplane Voltage: Supplied via ControlLogix chassis
Power Dissipation: ~6.2 W
Backplane Load Current:
- 5.1 V DC @ 1.20 A
- 1.2 V DC @ 5.0 mA
Isolation Voltage: ± 50 V continuous

Memory & Capacity

User Memory: 3 MB onboard for programs and data
Max Digital I/O: 128,000 points
Max Analog I/O: 4,000 points
Total I/O: 128,000 points

Network & Communication

Ethernet Port: 1 × 1 Gb (EtherNet/IP)
USB Port: 1 × USB 2.0 (for programming/diagnostics)
Max EtherNet/IP Devices: Up to 60 nodes
Supports EtherNet/IP protocol
Programming and configuration via Studio 5000 Logix Designer

Key Features

Processes control logic for large-scale automation systems
Supports up to 32 tasks and 1,000 programs per task
4-character alphanumeric display for status and diagnostics
Suitable for simplex or redundant configurations (with proper power supply and chassis)

Physical & Environmental

Enclosure: Open-style, for rack mounting
Operating Temperature: 0 °C – 60 °C
Thermal Dissipation: ~21.2 BTU/hr
Compatible with 1756 series chassis (A4, A7, A10, A13, A17) and standard/redundant 1756-PA/PB/PSCA2 power supplies

Compatibility & Software

Designed for Allen-Bradley ControlLogix 5580 platform
Seamless integration with Studio 5000 Logix Designer for programming and system configuration

Logix5581E

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