Description
1. Product Title
Allen‑Bradley 871F-D70NP50-D4 Flat Pack Inductive Proximity Sensor, 70mm Sensing Distance, PNP Normally Open, M12 Micro QD Connector
2. Model Code Full Decoding
- 871F: Bulletin 871F series flat rectangular block inductive proximity switch
- D: 3-wire DC power type
- 70: Nominal sensing distance = 70 mm (ultra-long detection range)
- N: Unshielded installation type
- P: PNP sourcing output
- 50: 50mm square sensing face housing size
- D4: M12 4-pin Micro Quick-Disconnect plug connection
Core Overview
This is Rockwell AB long-distance flat block inductive proximity sensor, designed for non-contact detection of metal targets (ferrous/non-ferrous steel, aluminum, copper). Unshielded structure achieves 70mm ultra-wide sensing gap, ideal for large mechanical stroke, conveyor position detection and harsh workshop environments. Active production model, made in Germany.
3. Complete Technical Specifications
- Brand: Allen‑Bradley (Rockwell Automation)
- Model: 871F-D70NP50-D4
- Warranty: 1 Year factory warranty
- Lifecycle: Active, available for new orders
- Detection Principle: Inductive eddy current
- Sensing Range: 70mm (unshielded, maximum effective distance)
- Housing Form: Flat rectangular block with two mounting lugs, 50×50mm sensing head
- Power Supply: 10 ~ 30 VDC wide DC input
- Wiring Mode: 3-wire DC
- Output Type: PNP Sourcing, Normally Open (NO)
- Connector: M12 4-pin male Micro QD quick plug
- Protection Grade: IP67 / NEMA 4, 13
- Housing Material: Cast aluminum, fully potted internal circuit
- Indicator LEDs: Green = power on; Orange = output triggered
- Operating Temperature: -25℃ ~ +70℃
- Built-in Protection: Short-circuit protection, overload protection, surge & noise interference suppression
- Repeatability: ≤5% full scale; Hysteresis ≤10%
- Origin: Germany
- Certifications: CE, UL
4. Key Features
- Ultra-long 70mm detection distance, greatly reduces installation alignment difficulty
- Flat lug base, direct surface mounting on machine frames without cylindrical bracket
- IP67 sealed aluminum casing, resistant to cutting fluid, dust, vibration and impact
- Standard M12 plug wiring, fast cable replacement, convenient for field maintenance
- Compatible with all Rockwell Micro800, CompactLogix, ControlLogix PLC 24VDC digital input modules
5. Application Scenarios
- Automated Conveyor & Logistics Lines
Detect pallet, metal tray, trolley in-place position, track material counting and blocking status.
- Packaging & Metal Stamping Machinery
Large travel mechanical limit position detection, mold return position confirmation on heavy-duty equipment.
- Welding Workshop Equipment
871F series has anti-welding magnetic field interference capability, suitable for robotic welding fixture metal part detection.
- Hydraulic & Pneumatic Heavy Actuators
Cylinder full extend/retract position feedback for PLC closed-loop logic control.
Related AB Sensor Model Distinction
- 871F-D70NP50-D4: PNP NO output
- 871F-D70NN50-D4: NPN NO output (the only difference is sinking/sourcing type)
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