1756-L61 Rockwell Automation ControlLogix PLC Controller
Manufacturer: Allen-Bradley
Product No.: 1756-L61
Condition： In stock
Product Type: Processor Module
Product Origin: USA
Payment: T/T, Western Union
Weight: 420g
Shipping port: Xiamen
Warranty: 12 months
Estimate delivery times: 12-26 days (International), 3-6 days (United States).
Return within 30 days of purchase. Duties & taxes are non-refundable.
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Product Overview
The 1756-L61 is a high-performance programmable automation controller within the Allen-Bradley ControlLogix Series by Rockwell Automation. Designed for chassis-based mounting, it provides 2 MB of user program memory and 478 KB of dedicated I/O memory. The unit manages complex industrial processes with up to 128,000 digital I/O points and 4,000 analog I/O points. It features an integrated RS-232 serial interface and supports optional non-volatile memory backup using a 1784-CF128 CompactFlash card.
Technical & Hardware Specifications
| Brand & Manufacturer | Allen-Bradley / Rockwell Automation |
| Model & Catalog Number | 1756-L61 (ControlLogix Series) |
| Module Type | Programmable Logic Controller / Processor Module |
| User & I/O Memory | 2 MB User Memory; 478 KB I/O Memory |
| Non-Volatile Memory | 128 MB max via optional 1784-CF128 CompactFlash Card |
| Maximum Capacity | 128,000 Digital I/O; 4,000 Analog I/O; 250 Controller Connections |
| Program Execution Speed | 0.08 milliseconds scan time rate |
| Backplane Current Draw | 1.2 A at 5.1 Vdc (1200 mA); 14 mA at 24 Vdc |
| Power & Thermal Dissipation | 3.5 W power dissipation; 11.9 BTU/hr thermal output |
| Isolation Voltage | 30 V continuous isolation; dielectric withstand tested at 720 Vdc for 60 seconds |
| Serial Port Protocols | RS-232 supporting DF1 Full/Half-Duplex, DF1 Radio Modem, DH-485, ASCII, Modbus via logic |
System Architecture & Environmental Limits
| Chassis Compatibility | Mounts in any slot of 1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17 chassis |
| Supported Programming | Relay Ladder Logic (RLL), Structured Text (ST), Function Block Diagram (FBD), Sequential Function Chart (SFC) |
| Task Scheduling Capacity | 32 multitasking structures; 100 programs per task; supports event-driven triggers |
| Battery Backup Hardware | Series A: 1756-BA1, 1756-BATM, or 1756-BATA; Series B: 1756-BA2 lithium battery |
| Operating & Storage Temp | Operating: 0°C to +60°C (32°F to 140°F); Storage: -40°C to +85°C (-40°F to 185°F) |
| Vibration & Shock Resilience | 10 to 500 Hz at 2 g peak vibration; 30 g operating shock; 50 g non-operating shock |
| Physical Mass & Enclosure | 0.32 kg (0.71 lbs); open-style enclosure construction |
Target Applications & Machinery Diagnostics
The 1756-L61 processor handles medium-to-large industrial automation tasks such as high-speed packaging lines, water treatment plants, automotive assembly cells, and material handling systems. Control engineers utilize its multi-tasking execution engine to separate deterministic motion routines from asynchronous network communication tasks. System diagnostic routines monitor real-time battery status, track network connection dropped packets across 250 logical paths, and log controller fault codes directly to non-volatile CompactFlash storage during power loss events.
Global PLC Spare HUB's Insight
When migrating older production lines from legacy PLC-5 networks, our automation specialists frequently install the ControlLogix Series 1756-L61 as a centralized communication bridge. By pairing this CPU with a 1756-DHRIO module, engineers maintain existing DH+ drops while establishing high-speed EtherNet/IP links to modern HMIs. In field deployments, installing a fresh 1756-BA2 battery prior to commissioning prevents static memory loss during extended plant shutdowns.
Model Selection Comparison & Technical Recommendations
Evaluate hardware options across the ControlLogix Series CPU lineup before selecting spare inventory:
- Standard Base Model: The 1756-L61 delivers 2 MB user memory and built-in RS-232 serial connectivity for traditional field networks.
- Extended Memory Variant: The 1756-L62 expands available user memory to 4 MB for applications requiring larger data logging arrays and additional subroutines.
Selection Advice: For standard machine sequencing under 1,500 logic steps, the 1756-L61 offers an economical control solution. If your application executes extensive recipe management, complex motion axis trajectories, or expanded safety cross-checking, step up to the 1756-L62 to avoid runtime memory exhaustion.
Warranty, Dispatch & Packaging Guarantees
- Product Condition: 100% Brand New and Original in Factory Sealed Packaging
- Warranty Terms: Fully backed by a 12 Months factory warranty
- Order Processing Speed: Ships out within 24 to 48 hours following payment confirmation
- Global Express Courier: Direct worldwide shipping via FedEx, UPS, and DHL
Frequently Asked Questions (FAQ)
Q: What cable is required to connect a PC serial port directly to the front interface of this controller?
A: Use a 1756-CP3 or 1747-CP3 null-modem serial cable with a right-angle connector designed for the controller faceplate.
Q: How does hardware Series A differ from Series B regarding battery backup installation?
A: Series A controllers utilize 1756-BA1, 1756-BATM, or 1756-BATA lithium batteries, whereas Series B units require the 1756-BA2 battery.
Q: Can third-party CompactFlash cards be used for non-volatile memory backup?
A: No, only industrial-grade Allen-Bradley 1784-CF128 cards formatting with proprietary industrial block structures are recognized by the controller firmware.
Q: What happens to controller program logic if the main backplane power fails without an installed battery?
A: Volatile RAM is lost immediately; the controller will boot into an unprogrammed default state unless a non-volatile 1784-CF128 card restores the image.
Q: Is it possible to plug or unplug this CPU module while backplane chassis power is applied?
A: Yes, the ControlLogix platform supports RIUP (Removal and Insertion Under Power), though stopping active machine motion prior to removal is strongly recommended.
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Q: Are these parts 100% original and new?
A: Yes. Every component is guaranteed to be 100% original, brand-new, and factory-sealed. We also provide a 12-month comprehensive warranty for your peace of mind.
Q: How fast is the shipping to my country?
A: For in-stock items, we offer same-day dispatch. International express shipping (DHL/FedEx/UPS) typically delivers within 3–5 business days worldwide.
Q: Can I get a formal quotation with shipping costs?
A: Absolutely. Our sales team is ready to provide a detailed Proforma Invoice (PI) including the most competitive shipping rates for your location.
Q: Do you offer discounts for bulk orders?
A: We provide volume-based pricing for large projects or multiple-item orders. Please contact us to get our Best Price Guarantee.
12-Month Comprehensive Warranty
Every part supplied by Global PLC Spare Hub is covered by a 12-month warranty from the date of invoice.
- Coverage: Functional defects and hardware failures under normal operating conditions.
- Commitment: We provide immediate repair, replacement, or a full refund for any verified defective components to minimize your operational downtime.
Returns & Exchange Policy
We offer a 30-day return policy to ensure you receive the exact part your system requires.
- Eligibility: Returns are accepted for uninstalled items in their original, factory-sealed packaging.
- RMA Process: Please contact our support team to obtain a Return Merchandise Authorization (RMA) number before shipping.
- Fast Processing: Refunds or exchanges are processed within 3–5 business days after the returned item passes our technical inspection.
Need Technical Assistance?Not sure if this part is compatible with your system? [Consult our Engineers] before purchasing to ensure 100% compatibility.
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