Product Details
Overview
The Allen-Bradley 1756-L61 ControlLogix controller is a high-performance processor module designed for demanding industrial automation tasks. With 2 MB of user memory, it supports large control applications and high-speed data handling across complex systems. The module integrates easily into ControlLogix chassis and communicates via RS-232 serial ports using multiple industrial protocols.
Technical Specifications
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Model / Part Number: 1756-L61
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Brand: Allen-Bradley
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Product Type: ControlLogix Processor Module
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Product Line: ControlLogix Series
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Fixed Memory Options: 2 MB, 4 MB, or 8 MB
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Nonvolatile Memory: CompactFlash Card (1784-CF128)
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I/O Capacity: 128,000 Digital I/O, 4,000 Analog I/O
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Communication Interface: RS-232 Serial Port
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Supported Protocols: ASCII, DF1 (Full/Half Duplex), DF1 Radio Modem, DH-485, Modbus (via logic)
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Program Scan Time: 0.08 ms per 1K of Boolean instructions
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Backplane Current Draw:
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5V DC: 1.2 A
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24V DC: 14 mA
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Battery Options: 1756-BA1, 1756-BATM, 1756-BATA
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Vibration Tolerance: 10–500 Hz
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Relative Humidity: 5–95% (non-condensing)
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Weight: 0.75 lbs (0.34 kg)
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Lifecycle Status: Discontinued / Obsolete
Key Features
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Designed for medium to large-scale automation systems
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Supports multiple communication protocols for flexible integration
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Compatible with ControlLogix chassis for modular expansion
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High-speed data processing with deterministic performance
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CompactFlash card support for data retention and transfer
Applications
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Process and machine control systems
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Data acquisition and supervisory control
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Integration of legacy and modern devices within plant networks
FAQs
Q1: What type of memory is included in the 1756-L61 module?
The module includes 2 MB of onboard user memory and supports external CompactFlash cards for nonvolatile storage.
Q2: Which protocols are supported by the RS-232 interface?
It supports DF1, ASCII, DH-485, and Modbus communication for flexible network integration.
Q3: Is the 1756-L61 still available for purchase?
The 1756-L61 has been discontinued by Allen-Bradley but remains supported for replacement and maintenance purposes.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.