Overview
The Allen-Bradley 871L-XCB15S40 is a 2-wire inductive proximity sensor in limit switch style housing, designed as a non-contact alternative to mechanical NEMA limit switches. Operating across 20–250VAC/VDC, this shielded sensor detects ferrous and non-ferrous metals without physical contact, making it ideal for machinery monitoring, positioning control, and process automation where harsh industrial environments demand rugged, contactless switching.
Key Features
- Inductive sensing technology—detects metal objects without contact
- Shielded design for EMI/RFI immunity in industrial settings
- Adjustable 1NO or 1NC output configuration for flexible control logic
- 15mm (0.59-inch) sensing distance allows flexible mounting distances
- 500mA load capacity suitable for relay coils and small control circuits
- Compact, rugged plastic enclosure rated NEMA 4/12 equivalent
Technical Specifications
The Allen-Bradley 871L-XCB15S40 proximity switch offers robust performance across standard industrial voltage ranges and is suitable for light-duty through moderately demanding applications:
- 2-wire input voltage: 20–250VAC or 20–250VDC
- Sensing distance: 15mm (limit switch style; shorter than larger round-body sensors)
- Output: 1NO or 1NC selectable, 500mA maximum load
- Connection: 1/2″–14 NPT or quick-disconnect base
- Operating temperature: −13 to +158°F (−10 to +70°C)
- Housing: Polyloy plastic, shielded ferrite
- Certifications: CE, KC
Typical Applications
Inductive proximity sensors are essential components across packaging, material handling, and process automation. The 871L series handles:
- Packaging machinery: Position detection on conveyors, product ejection controls, and count-and-release operations
- Automotive manufacturing: Welding cell proximity detection, part positioning, and door/guard interlocks
- Food and beverage processing: Wet-environment detection (washdown-rated), filler/capper control, and cap detection
- Machine tool positioning: Chuck position sensing, part presence confirmation, and end-of-stroke detection
- Assembly and material flow: Pallet presence, work-in-process tracking, and gate controls
Compatibility & Replacements
Compatible With
- Allen-Bradley 871L series industrial control systems and relay logic
- General-purpose PLC discrete I/O modules (24VDC input conversion required for some 5V modules)
- Standard industrial control relays and contactors 20–250VAC
- 24VDC auxiliary control systems (when used with external 24VDC relay coil)
- Legacy hardwired control panels and machine safety circuits
Replaces / Drop-In Replacement For
- Mechanical NEMA-style limit switches (with proper 1NO/1NC output selection)
- Earlier Allen-Bradley 871L analog or switch versions (consult engineering for exact cross-reference)
- Verify compatibility with your system integrator for legacy machine retrofits
Works With
- 2-wire AC/DC control systems (no polarity concern for AC operation)
- Hardwired relay ladder logic and electromechanical control circuits
- Industrial PLC discrete input modules (via control relays if voltage step-down required)
- Standard industrial panel-mount connectors and quick-disconnect bases
- Shielded wiring recommended for EMI-sensitive environments
