Overview
The Allen-Bradley 871L-XCB40S40 is a cylindrical inductive proximity sensor in limit switch style housing, providing non-contact object detection for industrial automation and motion control applications. Part of Rockwell Automation’s Bulletin 871L series, this 40mm sensor operates across a wide 20-250V AC/DC voltage range and is specified for machine tool positioning, conveyor sensing, and general manufacturing automation where reliable metallic target detection is required.
Key Features
- 40mm adjustable sensing distance for precise detection
- 2-wire unshielded configuration—simplified wiring and cost-effective
- 1NO-1NC contact output—normally open and normally closed terminals for flexibility
- 20-250V AC/DC operating voltage—broad compatibility with industrial control systems
- 500 mA rated load—suitable for direct relay or PLC input module control
- 1/2″-14 NPT quick-disconnect connector—fast installation and field replacement
- Polyloy construction with NEMA 3/4/6/12/13 and IP65 enclosure rating
Technical Specifications
- Sensing Method: Inductive (ferrous metallic target)
- Contact Configuration: 1NO-1NC (dual output)
- Sensing Distance: 40 mm (adjustable)
- Operating Voltage: 20–250 VAC/VDC
- Load Rating: 500 mA
- Wire Configuration: 2-wire, unshielded
- Connector Type: 1/2″-14 NPT quick-disconnect
- Housing Material: Polyloy (engineered plastic)
- Dimensions: 40 × 40 × 120 mm
- Environmental Rating: NEMA 3/4/6/12/13, IP65
- Operating Temperature: -13 to 158 °F (-10 to 70 °C)
- Vibration Tolerance: 55 Hz
- Certifications: CE, KC
- Series: Bulletin 871L (plastic limit switch style sensors)
- Condition: New in Box
Typical Applications
The 871L-XCB40S40 is commonly deployed in:
- Machine tool automation—chuck position detection, turret indexing, part presence sensing
- Conveyor systems—part arrival, discharge, and lane control
- Assembly automation—workpiece positioning and verification
- Material handling—lift and lower position confirmation
- Packaging machinery—bottle, can, or carton detection
- General industrial control—any application requiring non-contact proximity switching with AC or DC logic supplies
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix, ControlLogix, MicroLogix PLC input modules
- Siemens S7-1200, S7-1500 analog and digital input cards
- Mitsubishi FX, Q, and L-series PLCs
- Omron CJ, CP, and CQM PLCs
- Schneider Electric Modicon M241, M251 controllers
- GE SRTP and PACSystems controllers
- Any 24–250V AC/DC industrial control system
- Relay logic cabinets and hardwired automation
Replaces / Drop-In Replacement For
The 871L-XCB40S40 is a direct replacement for earlier revisions of the same part number. Verify compatibility with your system integrator if replacing legacy sensors from other manufacturers (e.g., Turck, Balluff, or Banner industrial proximity switches with similar voltage and contact ratings). Consult the manufacturer’s cross-reference guide for specific model compatibility.
Works With
- Studio 5000 (Allen-Bradley) — direct I/O mapping
- TIA Portal (Siemens) — standard digital input configuration
- GX Works (Mitsubishi) — relay contact simulation
- CX-Programmer (Omron) — standard contact input
- EcoStruxure Machine Expert (Schneider) — analog or digital input
- PROFINET, EtherNet/IP, Modbus networks (via appropriate gateway or I/O module)
- All standard hardwired relay and contactor logic circuits
