Allen-Bradley 1756-L65 ControlLogix 5565 Processor 32MB Memory

Product Overview

The Allen-Bradley 1756-L65 is a high-capacity, single-slot PLC processor belonging to the powerful Logix5565 controller line. Engineered to anchor heavy industrial applications, it features an expansive 32 Mbytes of volatile user program memory and a dedicated 478 Kbytes of high-speed I/O memory. Designed for flexible system scaling, the 1756-L65 supports a massive total capacity of up to 128,000 I/O points (including up to 4,000 analog points) and executes up to 32 independent multi-tasking routines simultaneously. Weighing 0.35 kg (0.77 lbs), this advanced controller slots directly into any standard Allen-Bradley ControlLogix chassis to deliver deterministic processing across massive automated plant infrastructures.

Core Technical Advantages

• Massive 32MB User Memory Matrix: Provides ample room for large user logic code, extensive data logging structures, and advanced mathematical scripting blocks, eliminating the need to segment complex programs.
• True Multitasking Logic Engine: Handles 32 tasks simultaneously (1 continuous task and up to 31 periodic or event-driven tasks) to easily prioritize time-critical machine motions over background calculations.
• Industrial Toughness & Isolation: Tested for 720 VDC structural isolation, 30G operational shock waves, and continuous 2.0G plant floor vibrations across a 0 to 60 degrees Celsius thermal window.

Technical Specifications

Installation & Engineering Guide

• Chassis Mounting & Layout: The 0.35 kg CPU module can be hot-swapped or cold-inserted into any slot position within a standard ControlLogix chassis (such as the 1756-A4, A7, A10, A13, or A17 frameworks). Line up the circuit edges with the chassis guide tracks, pushing firmly back until both the upper and lower plastic retaining tabs snap securely onto the metal structure to support the unit against plant floor vibrations.
• Non-Volatile Flash Configuration: To protect your 32MB application code against power failures, insert a compatible CompactFlash card into the front memory slot. Through Studio 5000, engineers can configure the processor to boot up automatically from the card during power-on, ensuring zero runtime data loss.
• Network Architecture Integration: While the 1756-L65 includes a native RS-232 serial port for diagnostic laptops or legacy networks, large-scale plant distributions should run alongside dedicated communication bridge cards (like the 1756-EN2T for EtherNet/IP, 1756-CN2 for ControlNet, or 1756-DNB for DeviceNet links).

Technical FAQs

Q1: What happens if the onboard battery fails on the 1756-L65 processor?
A1: The 1756-L65 utilizes volatile RAM to maintain runtime logic. If the 1756-BA2 lithium battery dies while the chassis loses power, the volatile 32MB memory will drop its program. To prevent this downtime, we highly recommend storing a permanent copy of your application logic on an optional CompactFlash card.

Q2: Can the 1756-L65 communicate directly over EtherNet/IP out of the box?
A2: The processor only features a built-in RS-232 serial port. To link the 1756-L65 to an EtherNet/IP network, you must add an adjacent Ethernet communication module, such as the 1756-EN2T or 1756-ENBT, into the same ControlLogix backplane chassis.

Q3: Does the 0.35 kg mechanical weight place limits on where I can install the card inside the chassis?
A3: Not at all. The compact 0.35 kg balance is distributed across a single-slot standard width footprint. Thanks to its native direct backplane connection system, it operates with full efficiency in any open slot location of your rack, though slot 0 is the common engineering standard for the main CPU.