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
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
Modern Programmable Logic Controllers manage execution through distinct operational states: Run, Stop, Start-Up, and Hold. During power-up, a controller initializes memory registers within Stop mode before briefly transitioning to Start-Up mode. During this phase, internal self-diagnostics evaluate system integrity across hardware and user programs. If the controller detects no critical faults, it enters Run mode to execute the control program continuously. However, any severe system anomaly forces the CPU back into Stop mode immediately to prevent erratic machine behavior across the plant floor.
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.