Description
Allen‑Bradley 1756-L71 ControlLogix Logix5571 Programmable Automation Controller
Product Description
The 1756-L71 is the Logix5571 controller for Rockwell Allen‑Bradley ControlLogix platform. Equipped with 2MB user memory and 0.98MB I/O memory, it executes control logic, handles I/O data exchange, motion control and communication tasks for medium and large-scale automation systems. It has one built-in USB 2.0 local programming port for program download, upload and diagnostics. The controller communicates with I/O modules via ControlLogix backplane, and works with external communication cards (such as 1756-EN2TR) to connect EtherNet/IP, ControlNet, DeviceNet networks. It supports up to 32 tasks, 100 motion axes and maximum 128,000 digital I/O / 4,000 analog I/O points. An SD card slot is available for non-volatile program backup, and an energy storage capacitor module (1756-ESMCAP) preserves data during brief power loss. It is a hot-swappable single-slot rack module widely used for process and discrete industrial automation.
Technical Specifications
- Part Number: 1756-L71
- Manufacturer: Rockwell Automation (Allen‑Bradley)
- Series: ControlLogix 5570 family
- Device Type: PAC Programmable Automation Controller
- User Memory: 2 MB
- I/O Memory: 0.98 MB
- Max Digital I/O: 128,000
- Max Analog I/O: 4,000
- Supported Motion Axes: 100
- Local Port: USB2.0 programming port
- Non-volatile Storage: SD card slot (supports up to 2GB SD card)
- Backplane Current Draw: 5mA @1.2VDC; 800mA @5.1VDC
- Power Dissipation: 2.5 W
- Max Controller Tasks: 32
- Operating Temperature: 0°C ~ +60°C
- Storage Temperature: -40°C ~ +85°C
- Relative Humidity: 5%~95%, non-condensing
- Mounting: Single slot in ControlLogix chassis
- Hot Swap: Supported
- Weight: Approx. 0.45 kg
- Certifications: CE, UL, ATEX Class I Div.2
1756-L71
Key Features
- 2MB Logix5571 controller for medium & large ControlLogix automation systems
- Built-in USB port for on-site programming, firmware update and troubleshooting
- Supports multi-task scheduling, motion control, analog/digital sequential control
- SD card slot for project backup, firmware storage and quick program restoration
- Energy storage capacitor protects data against short-term power interruption
- Works with 1756 communication modules for EtherNet/IP, ControlNet networking
- Comprehensive self-diagnosis and fault logging for hardware and program errors
- Hot-swappable design for rack maintenance without full system shutdown
Application Scenarios
- Petrochemical and refinery process control systems
- Power plant boiler, turbine auxiliary PLC control
- Automotive assembly line automation and motion control
- Water & wastewater treatment distributed control
- Mining, cement and heavy industry production lines
- Food & beverage batch and continuous manufacturing
- Material handling, conveyor and packaging automation
- Large factory EtherNet/IP networked control systems
Matching / Auxiliary Components
- 1756 ControlLogix chassis and backplane
- 1756 series AI/AO/DI/DO I/O modules
- Communication modules such as 1756-EN2TR EtherNet/IP module
- 1756-PA75 / 1756-PB72 rack power supply
- 1784-SD1 / SD2 SD memory card
- 1756-ESMCAP energy storage capacitor module
- Studio5000 / RSLogix5000 programming software
- Industrial shielded Ethernet cables and network switches
1756-L71
Related Rockwell ControlLogix Series Models (9 pcs)
- 1756-L71 2MB Logix5571 Controller
- 1756-L72 4MB Logix5572 Controller
- 1756-L73 8MB Logix5573 Controller
- 1756-L75 32MB Logix5575 Controller
- 1756-EN2TR Dual Port EtherNet/IP Module
- 1756-IF16 16CH Analog Input Module
- 1756-OB16E Digital Output Module
- 1756-PB72 ControlLogix Power Supply
- 1756-CN2R ControlNet Communication Module
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