The Allen Bradley 1756‑L71K is a ControlLogix controller.
Technical Specifications
- Model: 1756‑L71K
- User Memory: 2 MB
- I/O Memory: ~0.98 MB
- Ethernet: None (optional interface modules supported)
- USB Port: Local programming only
- I/O Capacity: Up to 128,000 digital / 4,000 analog points
- Power Consumption: 5 mA @ 1.2 V; 800 mA @ 5.1 V
- Power Dissipation: ~2.6 W
- Dimensions: 5.08 × 18.16 × 23.24 cm; Weight ~0.39 kg
- Temperature: 0–60 °C operating; –40–85 °C storage
- Isolation Voltage: 30 V continuous
- Certifications: UL, CSA, CE, IECEx, ATEX, FM, KC, RCM, Marine
- Conformal Coating: Yes
- Lifecycle Status: Active
Key Features
- Compact ControlLogix 5571 controller with robust conformal coating
- Supports complex logic with ample I/O capacity
- USB port for onboard programming; network modules optional
- Resilient design protects against dust, moisture, and contaminants
- Ideal for moderate-size automation systems requiring reliability
Compatible Components & Accessories
- ControlLogix/CompactLogix chassis and 5 V power supplies
- Optional communication modules: Ethernet, ControlNet, DeviceNet, etc.
- Studio 5000 Logix Designer and PanelView Plus HMIs
- Secure Digital (SD) cards for non-volatile storage
Industry Applications
- Machine automation, packaging, and material handling
- Batch processing, food & beverage, energy, and utility control
- Mid-to-large machine systems requiring rugged controllers
Installation & Maintenance Notes
- Install in ControlLogix 5570/5580 chassis
- Keep unused slots covered to maintain system integrity
- Use USB port only for programming access; remove when not in use
- Replace SD cards only with power off to prevent data loss
- Ground chassis and shield I/O cables per best practices
Request a Quote
For pricing and availability, please Contact Us or call 1‑800‑755‑2883.
Disclaimer: TCI Supply is not an authorized Allen Bradley Distributor.
Frequently Asked Questions
Can this controller operate in corrosive environments?
Yes—its conformal coating protects against moisture, dust, and mild corrosive vapors.
How many I/O points can it manage?
This controller supports up to 128,000 digital and 4,000 analog I/O points, ideal for large systems.
Is the SD card hot-swappable?
No—always power down the controller before inserting or removing SD cards to avoid data loss.