Allen Bradley 1756-L71 ControlLogix Processor

The AB 1756-L71 is a high-performance ControlLogix programmable automation controller (PAC) featuring 2 MB of user memory and a modular form factor. Designed for advanced control applications, it integrates seamlessly into Logix 5000 systems and supports scalable architectures across a wide range of industries.

This controller supports communication via a single USB port and integrates with industrial networks through optional communication modules. With a SIL 3 and PL e safety rating, it is ideal for use in high-integrity safety-related automation environments.

Technical Specifications

Model: 1756L71
Series: ControlLogix 5570
Type: Programmable Automation Controller (PAC)
Memory Size: 2 MB user memory
Form Factor: Modular
Mounting: Chassis-based rack assembly
Integrated Display: Yes
Front Installation: Supported
Rack-Mountable: Yes
Rail Mounting: Not supported
Battery/Capacitor Backup: Optional Energy Storage Module (1756-ESMC or ESMNR)

Electrical Specifications

Input Voltage: Supplied via ControlLogix chassis backplane
Power Dissipation: ~5.1 W
Backplane Current (5.1V): 1.2 A
Backplane Current (24V): 14 mA
Heat Dissipation: ~17.4 BTU/hr
Isolation Voltage: 30V (continuous), basic insulation
Protection Type: Short-circuit and overcurrent protection via chassis power supply

Network & Interface Specifications

Integrated Interfaces:

• USB Port: 1 (Type B) – for programming and configuration

Supported Protocols:
✅ EtherNet/IP (via communication module)
✅ Modbus (via communication module)
❌ Data Highway
❌ SERCOS
❌ TCP/IP (not directly supported)

Network Redundancy: Supported via external modules
Compatible Communication Modules: 1756-EN2T, 1756-CN2R, etc.

Mechanical Specifications

Enclosure Type: Modular slot-type (fits into ControlLogix chassis)
Width: 292 mm
Height: 240 mm
Depth: 164.52 mm
Mounting Orientation: Vertical rack mounting
Weight: Approx. 0.6 kg
Installation Environment: Within protective control cabinet

Environmental Specifications

Operating Temperature: 0…60 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5% to 95% non-condensing
Vibration Resistance: 2 g @ 10–500 Hz
Shock Rating: 30 g operating, 50 g non-operating
Pollution Degree: 2
Certifications: For use in Class I Div 2 Groups A, B, C, D

Compliance & Certifications

Certifications: UL, c-UL, CE, ATEX, RoHS
SIL Rating: SIL 3 (IEC 61508)
Performance Level: PL e (EN ISO 13849-1)
EMC Compliance: EN 61000-6-2 / 6-4
Standards Met: EN 61131-2, IEC 61508
Safety Applications: Suitable for safety-related automation with proper configuration

Key Features & Benefits

✅ 2 MB Onboard Memory – Ideal for large-scale logic and data-intensive control strategies

✅ SIL 3 & PL e Certified – Suitable for use in safety-critical automation systems

✅ Modular Design – Fits directly into a ControlLogix chassis for scalable and flexible system architecture

✅ USB Connectivity – Quick configuration and firmware updates via USB interface

✅ Wide Protocol Support – Works with EtherNet/IP and Modbus through optional comms modules

📦 Order the Allen Bradley 1756-L71 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 1756-L71 prices. This modular ControlLogix controller provides the performance and safety assurance required for mission-critical automation applications—available now with expert technical support.

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