Overview
The Allen-Bradley 45LST-1LEA2-P4 is a metal optical fork sensor designed for precision small part detection in industrial automation. This infrared-modulated sensor features a 30mm sensing gap and metal housing for reliable detection on high-speed conveyors, cartoning machines, and assembly equipment. The unit combines rugged construction with adjustable sensitivity and selectable output configuration for drop-in compatibility with existing control systems.
Key Features
- 30mm infrared modulated sensing gap for reliable object detection
- Metal fork design with adjustable sensitivity for precise triggering
- NPN/PNP selectable output for flexible circuit integration
- IP67 rated enclosure for machine wash-down and humid environments
- 4-pin M8 pico quick-disconnect connector for fast installation
- Highly visible power and output LED indicators on both sides of fork
- Multiple mounting options: through-holes, threaded holes, and dovetail slots
- Remote teach and teach button lock on 4-pin model
Technical Specifications
- Supply Voltage: 10–30 VDC
- Maximum Output Current: 40 mA
- Sensing Gap: 30 mm (1.2 in.)
- Sensing Method: Infrared modulated (LED light source)
- Output Type: NPN/PNP selectable
- Connector: 4-pin M8 pico quick-disconnect (threaded)
- Response Time: 30 μs to 1 ms
- Enclosure: Metal
- Mounting Type: Side through hole
- Operating Temperature: –4 to 140°F (–20 to 60°C)
- Certifications: UL, CE, CUL, KC
- Minimum Object Detection: 0.2 mm (0.08 in.)
- Connection: 4-pin pico M8 threaded connector
Typical Applications
- Cartoning and packaging machinery for product counting and position detection
- High-speed conveyor systems requiring split-second object sensing
- Vertical form-fill-seal (VFFS) machines for film registration and product detection
- Assembly line fixtures for small component presence verification
- Bottle and container detection on filling and labeling lines
- Sheet media and envelope detection in mail and document handling equipment
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix and ControlLogix PLCs with analog input or 24 VDC sourced I/O
- Siemens S7-1200 and S7-1500 controllers with 24 VDC I/O cards
- Mitsubishi FX and Q-series PLCs via 24 VDC digital input modules
- Omron CP and NX controllers with standard 24 VDC input cards
- Any industrial control system with 10–30 VDC power supply and NPN/PNP capable inputs
- EtherNet/IP, PROFIBUS, and standard hard-wired discrete control systems
Replaces / Drop-In Replacement For
- 45LST-1LEA1-P4 (15mm gap alternative)
- 45LST-1LEA3-P4 (50mm gap alternative)
- Previous generation Allen-Bradley photoelectric fork sensors with M8 connectivity and 10–30 VDC input
- Verify compatibility with your system integrator before ordering if replacing legacy sensor models
Works With
- Studio 5000 (RSLogix 5000) for CompactLogix and ControlLogix tag-based programming
- TIA Portal for Siemens integration
- Standard 24 VDC discrete I/O wiring and industrial control cabinets
- 4-pin M8 quick-disconnect cordset 889P-F4AB-2 (recommended standard connector)
- Light operate and dark operate selectable modes for flexible detection logic
