Panasonic NA2-N16D Safety Light Curtain – NA2 Series

Panasonic NA2-N16D: 16-Beam Type 4 Safety Light Curtain for Industrial Machine Guarding

The Panasonic NA2-N16D is a 16-beam optoelectronic safety light curtain operating within the NA2 series platform, designed to provide personnel and limb detection across hazardous machine access zones. Rated to IEC 61496-1/-2 Type 4 — the highest electro-sensitive protective equipment (ESPE) category — this unit delivers deterministic dual-channel OSSD (Output Signal Switching Device) outputs with a worst-case response time of ≤10 ms, making it suitable for integration into Category 4 / PLe safety architectures per EN ISO 13849-1.

Unlike general-purpose photoelectric barriers, the NA2-N16D is purpose-built for safety-critical applications: press brakes, robotic cell perimeters, conveyor access points, and automated assembly stations where finger and hand detection at minimum object diameters is a regulatory requirement. The 16-beam configuration provides a protected height sufficient for hand and arm detection across a defined sensing field, with beam pitch engineered to meet the minimum object resolution (MOR) thresholds mandated by machinery safety directives.

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Technical Parameters

Hardware Logical Analysis

The NA2-N16D implements a time-division multiplexed (TDM) infrared beam scanning architecture. The emitter sequentially activates each of the 16 infrared LED channels at a fixed clock rate; the receiver’s photodiode array samples each corresponding channel in synchronization. This serialized scan cycle completes within the ≤10 ms response window, after which the internal safety microcontroller evaluates the full beam-state matrix before asserting or de-asserting the OSSD outputs.

Dual-Channel OSSD Architecture: Both OSSD1 and OSSD2 outputs are independently driven by separate microcontroller output stages. The safety controller continuously cross-monitors both channels: if either output deviates from its expected state — due to a short-circuit to 24 V, a short-circuit between channels, or an internal fault — the controller forces both outputs to the OFF (de-energized) state within the response time. This cross-fault detection mechanism satisfies the diagnostic coverage requirements for Category 4 architectures.

EMC Design: The aluminum extrusion housing provides a Faraday-cage effect around the internal PCB stack, attenuating radiated electromagnetic interference from adjacent variable-frequency drives (VFDs), servo amplifiers, and welding equipment. Internal signal lines are routed with controlled impedance and shielded from the power supply traces, reducing susceptibility to conducted EMI on the 24 V DC supply rail. The optical sync channel between emitter and receiver eliminates the need for a synchronization wire, removing a common source of ground-loop-induced noise in multi-axis installations.

Ambient Light Rejection: The receiver’s photodiode front-end incorporates a narrow-band optical filter matched to the emitter’s infrared wavelength, combined with an AC-coupled amplifier stage that rejects DC ambient light components up to 10,000 lx (direct sunlight equivalent). This ensures stable operation in facilities with large skylights or high-intensity task lighting without requiring additional shielding.

Self-Test Diagnostics: At each power-on cycle and periodically during operation, the NA2-N16D executes an internal self-test sequence: OSSD outputs are briefly toggled to verify that the downstream safety relay or safety PLC input correctly follows the signal transitions. If the monitored feedback does not match the commanded state within the test window, the unit latches into a fault state and requires a deliberate manual reset, preventing silent failure accumulation.

System Integration Benefits

• Deterministic Safety Response: The ≤10 ms OSSD response time provides a fixed, calculable stopping-distance parameter for safety distance calculations per ISO 13855, enabling precise guard positioning without excessive safety margins that waste floor space.
• Category 4 / PLe Compliance: Direct integration into the highest safety integrity level architectures without additional redundancy hardware, reducing BOM complexity and panel wiring labor.
• Optical Synchronization: Eliminates inter-unit sync wiring, reducing installation time and removing a failure mode (broken sync wire) that can cause nuisance trips in high-vibration environments.
• M12 Quick-Disconnect Cabling: Field-replaceable connectors allow unit swap-out without rewiring the control panel, reducing mean time to repair (MTTR) during unplanned maintenance events.
• IP65 Ingress Protection: Suitable for washdown-adjacent zones in food processing and pharmaceutical manufacturing where periodic water exposure is unavoidable, without requiring additional protective enclosures.
• Diagnostic Transparency: Integrated LED status indicators on both emitter and receiver provide beam-by-beam alignment feedback during commissioning and fault-state indication during operation, reducing diagnostic time from minutes to seconds.
• Wide Supply Voltage Tolerance: ±10% tolerance on the 24 V DC supply accommodates voltage sag on long cable runs and shared power rails without triggering false OSSD de-energization events.
• Compatibility with Panasonic Safety Controllers: Native compatibility with the Panasonic SF-C11 and SF-C21 safety relay modules allows direct OSSD wiring without intermediate signal conditioning, and supports muting function configuration via the NA2 series muting module for material-pass applications.

Quality Assurance & Global Logistics

Every Panasonic NA2-N16D unit supplied through siemensplc.com is sourced from verified Panasonic Industrial Devices SUNX supply channels. Units are not repackaged, relabeled, or modified in any form. Original manufacturer batch documentation, including production lot codes and compliance declarations, accompanies each shipment upon request.

Pre-shipment inspection covers: label and serial number authenticity verification, M12 connector pin-out continuity check, OSSD output functional test at 24 V DC, and packaging integrity assessment. Units failing any inspection criterion are quarantined and not dispatched.

Logistics operations are based in Xiamen, China, with established freight partnerships covering express courier (DHL, FedEx, UPS), air freight, and sea freight consolidation. Typical dispatch lead time for in-stock units is 1–3 business days. Export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (HS 8536.50) — is prepared for all international shipments. Customs clearance support and pre-shipment insurance are available upon request. Bulk orders of 5+ units qualify for volume pricing; contact the sales team for a formal quotation.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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