Allen Bradley 1756-L72 ControlLogix Processor

The AB 1756-L72 is a high-performance ControlLogix programmable automation controller (PAC) designed for large-scale and safety-critical automation applications. With 4 MB of user memory and a modular design, this controller supports complex motion, process, and discrete control within the Rockwell Logix architecture.

Equipped with a USB programming port and compatible with communication modules for EtherNet/IP and Modbus, the 1756-L72 provides flexible integration across distributed control networks. Certified to SIL 3 and PL e, it is suitable for use in high-integrity systems requiring functional safety.

Technical Specifications

Model: 1756L72
Series: ControlLogix 5570
Type: Programmable Automation Controller (PAC)
User Memory: 4 MB (4096 KB)
Form Factor: Modular
Mounting: Chassis-mounted (rack assembly only)
Integrated Display: Yes (alphanumeric)
Front Installation: Supported
Battery Backup: Optional Energy Storage Module (1756-ESMC or ESMNR)

Electrical Specifications

Input Voltage: Supplied via ControlLogix chassis backplane
Backplane Current Draw:
• 5.1V DC @ 1.2 A
• 24V DC @ 14 mA
Power Dissipation: Approx. 5.1 W
Heat Dissipation: Approx. 17.4 BTU/hr
Isolation Voltage: 30V continuous, basic insulation
Protection Type: Internal surge and overvoltage protection via chassis supply

Network & Interface Specifications

Integrated Interfaces:

• USB Port: 1 x USB Type B (for programming, configuration, and diagnostics)

Supported Protocols:
EtherNet/IP (via communication module)
Modbus TCP/IP (via application logic)
CIP Motion and Safety (with appropriate modules)
(Does not include onboard industrial Ethernet)

Network Expansion: Requires compatible comms modules (e.g., 1756-EN2T, 1756-CN2R)

Software: Studio 5000 Logix Designer (v20 and higher)

Mechanical Specifications

Width: 292 mm
Height: 240 mm
Depth: 164.52 mm
Mounting Orientation: Vertical, inside ControlLogix chassis
Enclosure Type: Open-type for panel enclosure
Weight: Approx. 0.6 kg

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: Suitable for use in Class I Div 2 hazardous areas

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
Functional Safety: Certified for safety applications with CIP Safety modules

Key Features & Benefits

✅ 4 MB User Memory – Supports complex applications and large-scale logic control

✅ SIL 3 / PL e Certification – Suitable for safety-rated environments and systems

✅ Modular Design – Fits into standard ControlLogix chassis for flexible expansion

✅ USB Programming Port – Simplifies firmware updates and project transfers

✅ Supports Multiple Protocols – EtherNet/IP and Modbus compatible with appropriate comms modules

📦 Order the Allen Bradley 1756-L72 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 1756-L72 prices. This SIL 3-certified ControlLogix controller delivers robust memory, safety compliance, and flexible network integration—available now with expert support and fast UK delivery.

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