Allen-Bradley 1756-L71 ControlLogix 2 MB Controller

Product Description

The Allen-Bradley 1756-L71 is a ControlLogix 5570 standard programmable automation controller manufactured by Allen-Bradley. Positioned within the ControlLogix family of controllers, the 1756-L71 delivers control capabilities across digital, analog, and motion control applications. It installs directly into any available slot of a standard ControlLogix 1756 I/O chassis, interfacing with the backplane to monitor and execute control functions across various industrial tasks.

Equipped with 2 MB of user memory, the 1756-L71 supports up to 32 controller tasks, including continuous, periodic, and event-driven execution models. It offers communication support over EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, and SERCOS networks via chassis-based communication interface modules. The controller features an embedded USB 2.0 port for local programming and maintenance, alongside an included 1 GB Secure Digital (SD) card for nonvolatile program storage.

Features

• 2 MB User Memory: Provides memory capacity for user programs and tag data.
• 32 Controller Tasks: Supports flexible task configuration with up to 1000 programs per task.
• Integrated Communication Support: Interfaces with EtherNet/IP, ControlNet, DeviceNet, DH+, Remote I/O, and SERCOS via chassis-mounted modules.
• USB 2.0 Maintenance Port: Features a full-speed front USB port dedicated to local programming, configuration, firmware updates, and online editing.
• Nonvolatile SD Storage: Includes a pre-installed 1784-SD1 1 GB Secure Digital card for data backup and program storage.
• Chassis Placement: Occupies a single slot and installs in any slot of a ControlLogix chassis.

Applications

• Automated assembly lines and discrete manufacturing systems
• Plant-wide industrial automation and process control
• Multi-axis motion control and positioning systems
• Distributed I/O control over industrial networks

Technical Specifications

Installation Guidelines

• Chassis Mounting: Seat the controller into any available slot of a compatible ControlLogix chassis (1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17) until the module levers lock firmly in place.
• USB Connection: Use the front panel USB 2.0 port for temporary local connection, programming, and firmware flashing. Do not use the USB port in hazardous locations.
• Energy Storage Module: Verify that an approved capacitor-based energy storage module (1756-ESMCAP or 1756-ESMNSE) is properly installed to retain state data during power loss.
• Cooling and Ventilation: Maintain adequate clearance around the chassis inside the enclosure to ensure proper airflow and prevent ambient operating temperatures from exceeding 60 degC.

Compliance and Certifications

• c-UL-us: UL Listed Industrial Control Equipment for US and Canada (File E65584); UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations (File E194810)
• CE: European Union 2014/30/EU EMC Directive (EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2)
• FM: FM Approved Equipment for use in Class I Division 2 Group A,B,C,D Hazardous Locations
• ATEX: European Union 2014/34/EU ATEX Directive (EN IEC 60079-0, EN IEC 60079-7, II 3 G Ex ec IIC T4 Gc)
• IECEx: IECEx System (IEC 60079-0, IEC 60079-7, Ex ec IIC T4 Gc)
• RCM: Australian Radiocommunications Act compliant with EN 61000-6-4
• KC: Korean Registration of Broadcasting and Communications Equipment
• CCC: CNCA-C23-01 Explosion-Proof Electrical Products
• EtherNet/IP: ODVA conformance tested