1756-L74 | Allen Bradley | ControlLogix Programmable Automation Controller

Product Description

The Allen Bradley 1756-L74 is a high-performance ControlLogix programmable automation controller designed for complex industrial applications. With 16 MB of user memory, support for up to 128,000 digital I/O points, and integrated redundancy, it delivers robust control capabilities. The controller supports multiple communication adapters and advanced motion integration, making it suitable for large-scale distributed systems.

Technical Specifications

• Manufacturer Allen Bradley

• Product Line ControlLogix 1756 Series

• Product Type Programmable Automation Controller

• Part Number 1756-L74

• Weight 0.63 lbs (0.28 kg)

• Module Type Processor module

• User Memory 16 MB

• Non-Volatile Memory 1 GB (included with controller)

• I/O Memory 0.98 MB

• Maximum Digital I/O 128,000 points

• Maximum Analog I/O 4,000 points

• Tasks Supported 32

• Programs per Task Up to 100

• Event Tasks All triggers supported

• Built-in Communication 1 × USB port

• Optional Communication Adapters EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink, third-party networks

• Redundancy Full system redundancy supported

• Integrated Motion Control

• SERCOS interface

• Analog options (encoder input, LDT input, SSI input)

• Integrated motion via EtherNet/IP

• Current Draw

• 5 mA @ 1.2 V DC

• 800 mA @ 5.1 V DC

• Power Dissipation 2.5 W

• Thermal Dissipation 8.5 BTU/hr

• Isolation Voltage 30 V continuous

• Enclosure Type Open-style

• Operating Temperature 0–60 °C (32–140 °F)

• Storage Temperature –40–85 °C (–40–185 °F)

Application Scenarios

• Large-scale automation requiring high I/O capacity

• Motion control systems with integrated EtherNet/IP support

• Redundant control systems for critical industrial processes

FAQ

Q: How much user memory does the 1756-L74 provide?  A: 16 MB of user memory, plus 1 GB of non-volatile memory.

Q: What communication options are supported?  A: Built-in USB and optional adapters for EtherNet/IP, ControlNet, DeviceNet, and more.

Q: Does the 1756-L74 support redundancy?  A: Yes, full redundancy is supported.

Comparable Models

• 1756-L74: High-performance controller with 16 MB memory (this model)

• 1756-L73: Mid-range controller with reduced memory capacity

• 1756-L75: Enhanced controller with expanded performance