Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1756-L71 |
| Product Type | ControlLogix Controller |
| Series | ControlLogix 5570 (Logix5571) |
| User Memory | 2 MB |
| I/O Memory | 0.98 MB |
| Nonvolatile Memory | 1 GB SD card (1784-SD1) included |
| Digital I/O, max | 128,000 |
| Analog I/O, max | 4,000 |
| Built-in Port | 1 × USB 2.0 (programming only) |
| Communication Options | EtherNet/IP, ControlNet, DeviceNet, etc. (via modules) |
| Current Draw | 5 mA @ 1.2 V DC; 800 mA @ 5.1 V DC |
| Power Dissipation | 2.5 W |
| Slot Width | 1 |
4. Product Introduction (Anti-Template)
The Allen-Bradley 1756-L71 is a ControlLogix 5570 series controller that provides 2 MB of user memory for standard control applications. It installs in any slot of a 1756 ControlLogix chassis and executes Logix programs developed in Studio 5000 Logix Designer.
The controller supports up to 32 tasks and 100 programs per task, with full event task capability. A built-in USB port allows temporary local programming. Network connectivity is provided through separate communication modules (EtherNet/IP, ControlNet, DeviceNet, and others). The 1756-L71 ships with a 1 GB SD card for nonvolatile storage and uses a removable energy storage module (capacitor-based) for power-down retention. It is widely used in medium-complexity machine and process control systems.
1756-L71
1756-L71
1756-L71
1756-L71
1756-EN2T
5. QC, Procurement & Logistics SOP
- Inbound Verification – Confirm catalog number (1756-L71), firmware revision, SD card presence, and energy storage module condition. Photograph all labels.
- Functional Testing – Install in a ControlLogix chassis, apply power, verify status indicators, and confirm recognition by Studio 5000 where possible.
- QA & Packaging – Protect the backplane connectors and USB port, clean the module, and pack in anti-static protective packaging.
- Global Logistics & Export Compliance – Classify under the correct HS code for programmable controllers. Packaging must protect against electrostatic discharge and mechanical shock; export documentation is prepared to minimize customs delays.
6. Technical Pitfalls & Integration Warnings
Firmware Matching – The controller firmware must be compatible with the Studio 5000 project version and any safety or motion modules in the system.
Memory Limits – With only 2 MB of user memory, large tag databases or extensive add-on instructions can exhaust available space. Monitor memory usage during development.
USB Port Use – The USB port is for temporary programming only and is not intended for permanent connection or use in hazardous locations.
Energy Storage Module – Ensure the capacitor energy storage module is properly seated. A missing or failed module affects power-down behavior and wall-clock retention.
7. Frequently Asked Questions (FAQ)
What is the realistic global lead time for a verified 1756-L71?
As a widely used ControlLogix controller, availability is generally good. Typical lead time after verification is 3–10 business days plus standard shipping.
How much user memory does the 1756-L71 have?
2 MB of user memory and 0.98 MB of I/O memory.
What software is required?
Studio 5000 Logix Designer (compatible versions supporting the 5570 series).
Does it have built-in Ethernet?
No. Network communication requires a separate 1756 communication module (e.g., 1756-EN2T).
Is the 1756-L71 still in production?
It is part of the mature ControlLogix 5570 family. Newer 5580 series controllers (1756-L8x) are recommended for new designs, but the L71 remains widely supported and available.
What should be confirmed before ordering a replacement?
Exact catalog number (1756-L71), required firmware revision, presence of SD card, and compatibility with the existing chassis and communication modules.
What are typical applications?
Machine control, process skids, packaging lines, and mid-sized automation systems using the ControlLogix platform.
