Allen-Bradley 1756-L61 ControlLogix 5561 CPU Module

Product Overview

The 1756-L61 serves as a core processing unit for the Allen-Bradley ControlLogix 5561 automation platform. This CPU module executes high-speed logic, manages complex motion control, and facilitates seamless data synchronization across the ControlLogix backplane. It handles intensive computational tasks for medium-to-large scale industrial applications. We offer this unit as 100% Brand New original stock, providing a high-integrity solution for facilities maintaining existing ControlLogix architectures.

Technical Specifications

The 1756-L61 delivers precise control through the following hardware parameters:

• Controller Series: ControlLogix 5561

• User Memory: 2 MB

• Current Draw (Backplane): 1.2 Amps at 5.1 VDC

• Current Draw (Backplane): 14 mA at 24 VDC

• Mounting Style: Chassis/Rack Mount (any slot)

• Operating Voltage: 24 VDC

• Weight: 0.71 lbs (0.32 kg)

• I/O Capacity: Supports up to 128,000 digital I/O points

Engineering Advantages

• Seamless Legacy Integration: This module allows plants to maintain existing systems without requiring a full platform migration to L7 or L8 series controllers. It ensures code compatibility and minimal downtime during hardware replacement.

• High-Speed Execution: The 32-bit RISC processor performs logic operations with millisecond precision. This speed optimizes cycle times for high-speed packaging, automotive assembly, and complex material handling systems.

• Flexible Communication Pathing: The 1756-L61 communicates across the backplane to EtherNet/IP, ControlNet, and DeviceNet bridges. It routes data efficiently between the supervisory level and field-level devices without taxing the main CPU task.

• Non-Volatile Memory Support: The module utilizes CompactFlash cards for non-volatile storage. This feature protects your user program and tag data against power loss, eliminating the need for constant battery dependency during long-term storage or maintenance.

FAQs

• Is the 1756-L61 provided as a brand new original unit despite being discontinued?

  Yes. We supply this module as 100% Brand New original factory stock. Each unit remains in its original packaging, ensuring full electronic integrity and performance as specified by the manufacturer.

• Does this CPU require a specific battery for memory backup?

  Yes, the 1756-L61 requires a 1756-BA1 or 1756-BA2 lithium battery to maintain the user program in the volatile RAM during power cycles. We recommend checking battery voltage annually to prevent program loss.

• Can I replace an L61 with the 1756-L71 suggested by the manufacturer?

  The 1756-L71 serves as the official functional replacement. However, upgrading to an L71 requires Studio 5000/Logix Designer version 20 or higher. Using a brand new 1756-L61 allows you to keep your current software version and hardware configuration exactly as designed.

• What are the installation requirements for the 1756-L61?

  You can install the 1756-L61 into any slot of a 1756 ControlLogix chassis. Ensure the chassis power supply (e.g., 1756-PA72) provides sufficient current for the 1.2 Amp draw of the CPU and all associated I/O modules.