Description
Product Introduction
The Autronica NK-50 is the core network interface board used to interconnect multiple AutroSafe series fire alarm panels, repeater cabinets, and control nodes over the proprietary AutroNet local area network. Mounted inside the main control chassis, it enables seamless bidirectional real-time data sharing across distributed fire detection nodes, ensuring that an alarm triggered on a remote deck or facility module instantly registers at the bridge main panel.
Engineered with dual redundant communication channels and high-grade optical isolation, the NK-50 prevents local line faults or ground loops on one network leg from bringing down the rest of the safety system. It automatically handles signal token-passing and network rerouting if a cable fault occurs between panels. For marine automation engineers and shore-based fire technicians maintaining legacy AutroSafe panel rings, having a verified NK-50 replacement card is essential for clearing ring fault errors and maintaining class compliance.
Key Technical Specifications
| Parameter | Specification |
| Manufacturer & Part No. | Autronica NK-50 (116-NK-50) |
| System Compatibility | AutroSafe BS-310, BS-320, BS-420, BC-320, BC-420 |
| Network Protocol | AutroNet (Autronica High-Speed Panel Network) |
| Interface Topology | Redundant Ring / Bus Configuration (Dual Channel) |
| Operating Voltage | 24 VDC (Internal backplane rack powered) |
| Galvanic Isolation | Opto-isolated network drivers (500V isolation barrier) |
| Max Network Nodes | Up to 64 interconnected AutroSafe nodes per network segment |
| Status Indicators | Front-edge LEDs for Power, Tx/Rx Activity, and Loop Fault |
| Form Factor | Internal rack-mount card with backplane edge connector |
| Conformal Coating | Marine-grade protective varnish against humidity and salt air |
Application Scenarios & The “Trench” Experience
The Marine Engineer’s 2 AM Emergency
You are the vessel’s chief electrician anchored off Singapore at 02:00. Suddenly, the main bridge BS-420 panel sounds a loud fault: “AutroNet Comm Failure – Node 3 Lost.” Node 3 controls the fire detection loops across the entire engine room accommodation block. A power surge damaged the line driver chip on the NK-50 card in the bridge master panel, breaking the network ring. Without data passing between panel nodes, safety watchkeeper compliance is compromised and port state inspection will hold the ship. You don’t have time to reconfigure the network architecture; you need to unbolt the failing NK-50, set the board jumpers on a spare unit, slot it in, and restore node link communications instantly.
Key Field Applications
- Commercial Marine Vessels: Multi-panel AutroSafe networks spanning bridge, engine control room, and safety officer cabins.
- Offshore FPSO & Platforms: Linking distributed fire panels across accommodation modules, process decks, and helidecks over redundant AutroNet loops.
- Industrial Manufacturing Plants: Decentralized fire alarm rings connecting multiple production buildings back to a central security station.
- System Retrofit & Maintenance: Direct drop-in card replacement on aging AutroSafe installations during scheduled drydocking.
NK-50
NK-50
Transparency SOP: Quality Assurance & Testing
Network communications boards require 100% data packet integrity—a missed network signal means a blind panel in a emergency. We don’t just ship boxes; we test them on actual Autronica test rigs.
- Inbound Visual & PCB Audit: Inspection of transformer couplings, optocoupler ICs, edge connector gold plating, and trace health.
- Backplane Power Rail & Handshake Test: The card is installed in an active AutroSafe rack frame to verify initial boot-up, power rail draw, and bus initialization.
- Dual-Channel Loopback Stress Test: Driving high-baud network data simultaneously across Channel A and Channel B to confirm zero packet loss and clean waveforms.
- Network Ring Break Simulation: Intentionally severing one comm channel during data flow to verify automatic failover rerouting to the redundant leg.
- Anti-Static Sealing & Marine Packaging: Cleared boards are treated with anti-static protection, vacuum-sealed in static shielding bags, and packed in dense industrial foam for sea transit.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Check Board Address Jumpers Before Power-Up
The NK-50 card uses hardware jumpers or rotary micro-switches to set its node identity on the internal backplane bus. Always take a clear photo of the board jumper array on the failed card before pulling it from the rack. Installing a replacement card with incorrect node address settings will cause an immediate network address conflict fault across all AutroSafe panels.
❗ Inspect Cable Shields on AutroNet Terminal Blocks
AutroNet cabling uses twisted-pair shielded wire. When swapping an NK-50 module, verify that the cable shield is grounded at one panel node only. If shipboard technicians landed shields at both ends during a past repair, ground loops will inject noise into the NK-50 receiver ICs, causing intermittent “Node Loss” warnings during heavy generator loads.
⚠️ Power Down Panel Chassis Before Extruding Card
Never hot-swap the NK-50 module while the backplane power supply rail is live. Arcing across the multi-pin backplane connector during extraction can fry the delicate optocoupler circuitry on adjacent card slots and corrupt memory on the panel CPU.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the NK-50 compatible with both standard AutroSafe BS-320 and newer BS-420 panels?
A: Yes. The NK-50 board was designed as a standardized AutroNet network interface module across the entire legacy AutroSafe panel series (BS-310, BS-320, BS-420, BC-420).
Q: What is the main difference between an NK-50 network card and a BSD-310 loop card?
A: The NK-50 handles panel-to-panel network communication over AutroNet (connecting control panels together). The BSD-310/310-N is a loop driver card that interfaces field detectors and manual call points directly to a single panel.
Q: Can I use fiber optic cables with the NK-50 card?
A: The standard NK-50 outputs copper serial/RS-485 network signals. To run fiber optic loops between distant panels, the NK-50 outputs must be connected to an external fiber media converter module (e.g., Autronica standard fiber conversion interfaces).
Q: Why buy surplus or refurbished NK-50 modules instead of upgrading the entire panel network?
A: Upgrading a multi-panel AutroSafe network to modern panel architecture requires replacing central processors, display units, and re-certifying safety systems—a project costing tens of thousands of dollars. Installing a pre-tested surplus NK-50 board keeps your existing network fully certified and operational at a fraction of the cost.
Q: What warranty coverage comes with your surplus or refurbished NK-50 modules?
A: Every NK-50 module we ship—whether unused factory surplus or fully bench-tested refurbished stock—is backed by our full 12-month replacement warranty.
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