1756-L64 | Allen-Bradley | ControlLogix 5564 Logix 5560 Processor

Technical Overview

The 1756-L64 is a high-capacity controller within the ControlLogix 5560 family, engineered to manage complex, data-intensive automation tasks. Featuring 16 MB of user memory and an additional 478 KB dedicated to I/O data, this module provides the computational power required for large-scale discrete, motion, and process control applications. It operates within the 1756 chassis system, leveraging the high-speed Producer/Consumer technology for efficient data distribution across the backplane.

Detailed Technical Specifications

• Manufacturer Allen-Bradley / Rockwell Automation

• Hardware Line ControlLogix 5560

• Module Identification 1756-L64

• Total User Memory 16 MB

• I/O Dedicated Memory 478 KB

• Maximum Discrete I/O Capacity 128,000 points

• Maximum Analog I/O Capacity 4,000 points

• Total Digital I/O Support 128,000 points

• Current Draw (5.1V DC) 1200 mA

• Current Draw (24V DC) 14 mA

• Power Consumption 3.5 Watts

• Thermal Output 11.9 BTU/hr

• Continuous Isolation Voltage 30V

• Serial Communication Integrated RS-232 port (DF1, DH-485, ASCII)

• Non-Volatile Storage Compatibility Supports 1784-CF128 CompactFlash cards

• Module Weight 1.13 lbs (0.51 kg)

Application and Capability

The 1756-L64 is frequently deployed in centralized control systems where high tag counts and complex instruction sets are the norm. It is capable of managing up to 250 controller connections and supports a diverse range of 1756 I/O modules in both local and distributed chassis. Unlike smaller processors in the 5560 range, the 16 MB capacity of the 1756-L64 allows for significant data logging and extensive comment documentation within the controller itself.

Comparison: 1756-L64 vs 1756-L63

• Memory Capacity The 1756-L64 offers 16 MB of memory, doubling the 8 MB capacity found in the 1756-L63.

• Instruction Execution Both share the same high-speed execution engine, but the 1756-L64 handles significantly larger program files without requiring memory optimization.

• Expansion Both support the same 1784-CF128 non-volatile memory cards for backup and firmware storage.

Frequently Asked Questions

• Does the 1756-L64 require a battery?

  Yes, this processor uses the 1756-BA1 or 1756-BA2 lithium battery to maintain the volatile memory during power outages. It is critical to monitor the "BATT" LED status.

• Can I use this controller in a Redundancy System?

  The 1756-L64 is compatible with standard redundancy firmware and the 1756-RM redundancy module, making it suitable for high-availability environments.

• What programming software is required?

  Configuration is performed via Studio 5000 Logix Designer or RSLogix 5000 software, depending on the firmware revision utilized.