ABB LXN1604-6, part number 3BHL000986P7000, is a high-efficiency DIN rail AC-DC power supply integrated with proprietary CEX-bus Gigabit Ethernet switch, purpose-built as the core power backbone for ABB Ability™ System 800xA distributed control systems (DCS). Adopting advanced LLC resonant soft-switching topology, this original ABB unit delivers industry-leading energy conversion efficiency, drastically cutting heat loss and energy consumption in continuous DCS operation environments. It unifies stabilized 24.7VDC power conversion and hard real-time deterministic communication into one compact DIN rail housing, eliminating the need for separate low-efficiency standalone power supplies and independent managed switches inside DCS control cabinets. We maintain abundant factory-sealed original spot inventory, conduct full pre-shipment efficiency and communication aging tests, and provide same-day packaging plus door-to-door global shipping for power, petrochemical, metallurgy, pharmaceutical and water treatment DCS cabinet assembly, automation system energy-saving retrofits and emergency spare part replacement projects worldwide.

Complete Technical Specifications Centered on High Efficiency DCS Power Performance

1. High-Efficiency Power Conversion Electrical Parameters

The core competitive advantage of LXN1604-6 lies in its optimized LLC resonant soft-switching circuit, which achieves conversion efficiency above 90% across the full 20%–100% load range, far exceeding traditional hard-switch industrial power supplies that waste massive energy as heat at partial loads.

• Dual universal input: AC 85–264VAC (47–63Hz), DC backup 90–350VDC, compatible with all global industrial mains and UPS generator power without auxiliary transformers
• Rated DC output: Stabilized 24.7VDC, 20A continuous current, total 500W rated power capacity, sufficient to power dual redundant AC800M controllers, S800 I/O racks, field transmitters, safety relays and internal CEX-bus switching circuits in a single DCS cabinet
• Ultra-low heat loss: Minimal power dissipation even under full continuous DCS load, reducing reliance on cabinet cooling fans and lowering auxiliary cooling energy consumption
• Low ripple noise: Output ripple controlled below 100mV peak-to-peak, preventing measurement drift of precision DCS analytical instruments and pressure transmitters powered by this unit
• Reinforced isolation: 3kV AC insulation between input power loop and DCS signal/CEX-bus communication circuits, filtering high-frequency harmonic interference from on-site inverters and servo motors
• Long service life MTBF: Over 50,000 hours under full-load 24/7 DCS unattended operation, extended by low internal operating temperature thanks to high-efficiency design
• Typical input current: Only 7A under full rated output load, reducing factory mains load and wiring loss for large DCS plant central power distribution systems

2. Integrated CEX-bus Real-Time Switch for DCS Redundant Control Network

Beyond high-efficiency power delivery, the embedded ABB exclusive CEX-bus switching chip constructs the real-time redundant communication backbone required by System 800xA DCS, sharing the same high-efficiency power unit without extra power consumption from separate switches:

• Multiple galvanically isolated 10/100/1000Mbps Gigabit RJ45 ports, total non-blocking switching capacity 12Gbps, forwarding rate 8.9Mpps
• Hardware-level sub-millisecond low-jitter CEX-bus cyclic data transmission, realizing loss-free process variable mirroring between primary and backup redundant AC800M DCS controllers
• RSTP rapid ring redundancy protocol with 20ms network fault recovery, guaranteeing bumpless master-standby DCS controller switchover without safety interlock trips
• Native support for Modbus TCP, PROFINET RT and MMS DCS control protocols, seamless bidirectional data exchange between DCS workstations, ABB variable frequency drives and field analyzers
• Built-in SNMP diagnostic channel: Real-time monitoring of power load rate, module internal temperature, Ethernet port packet loss and CEX-bus cycle deviation; all timestamped fault logs uploaded to DCS central HMI for maintenance traceability
• Hot-swap DIN rail design: Module replacement without shutting down the entire DCS cabinet, avoiding full production line interruption during maintenance

3. Multi-Layer Hardware Protection & DIN Rail Environmental Adaptation

A full suite of fast hardware protection circuits safeguards both the high-efficiency power conversion circuit and all downstream expensive DCS control hardware from on-site electrical faults:

1. Over Voltage Protection (OVP): Microsecond-level DC output cut-off to prevent breakdown of DCS controller mainboards and Ethernet transceivers during grid surges
2. Overload & Over Current Protection (OCP): Tolerates 120% long-term overload for DCS startup surge loads, automatic current limiting without permanent power module damage
3. Auto-Recovery Short Circuit Protection (SCP): Instant short-circuit current suppression; power resumes automatically after wiring fault elimination, no manual cabinet power cycle required
4. Over Temperature Thermal Lockout: Prevents power efficiency degradation and PCB aging caused by heat accumulation in densely arranged DCS DIN rail cabinets
5. Multi-stage EMC surge filter: Absorbs lightning and grid pulse interference for remote DCS sites with unstable power infrastructure

Mechanical & environmental specs optimized for DCS cabinet DIN rail layout:

• Dimensions: 194mm D × 113.6mm H, slim compact body, standard TS35 snap-on DIN rail mounting
• Net weight ~0.5kg, lightweight to avoid DIN rail deformation in dense DCS cabinet arrangements
• Three-proof conformal coated PCB, passes IEC 60068 anti-vibration testing, resists dust, moisture and chemical oil mist in industrial DCS control rooms
• Operating temperature range: -25℃ ~ +70℃ continuous stable high-efficiency operation; storage -40℃ ~ +85℃
• IP20 indoor cabinet protection grade, certified CE, UL 5085, RoHS and SIL2 functional safety for DCS safety interlock loops

Core High-Efficiency Advantages for System 800xA DCS Applications

First, outstanding energy efficiency cuts long-term plant operating costs for continuous DCS systems. Traditional split power supply + independent switch schemes adopt low-efficiency hard-switch circuits, wasting large amounts of electricity as waste heat every year. LXN1604-6’s LLC soft-switch technology minimizes energy loss, reducing factory electricity expenditure and lowering cabinet cooling fan runtime, especially critical for large-scale multi-cabinet DCS facilities running 24/7 all year round. Its low heat generation also slows component aging inside DCS cabinets, extending the service life of expensive AC800M controllers and I/O modules.
Second, all-in-one integrated design simplifies DCS cabinet layout and reduces hidden failure points. Separate power and switch modules occupy double DIN rail space and increase wiring terminals prone to loose contact faults that trigger DCS power loss or communication disconnection. This single high-efficiency unit combines DCS power supply and CEX-bus backbone switching, saving cabinet space, cutting assembly labor time, and reducing the variety of spare parts maintenance teams need to stock for multiple System 800xA DCS sets. Parallel N+1 redundant power expansion supports large multi-cabinet DCS networks to eliminate single-point power failure risks.
Third, factory pre-calibrated full DCS ecosystem compatibility eliminates commissioning risks. The module is fully pre-adapted to AC800M PM864/PM866 redundant DCS controllers, S800 distributed I/O racks and ABB ACS drive systems. Engineers complete one-click high-efficiency power parameter and redundant CEX-bus network topology configuration via Control Builder M software without secondary program debugging, drastically shortening DCS project on-site debugging and fault replacement recovery time.
Fourth, reliable original global spot supply ensures uninterrupted DCS operation. Refurbished or counterfeit power modules use inferior conversion chips with degraded efficiency and incomplete protection circuits, leading to frequent overheating trips and unstable DCS power under full load. All LXN1604-6 units we supply are unmodified factory genuine products with intact high-efficiency conversion and protection circuits, covered by a 12-month global quality warranty. Our professional automation technical team provides free remote guidance for DCS cabinet DIN rail layout, DCS load power calculation, energy-saving retrofit planning and power supply fault diagnosis after sales.

Typical DCS Industrial Application Scenarios

As the standardized high-efficiency power and CEX-bus communication core for ABB System 800xA DCS, LXN1604-6 is widely deployed in all continuous process control DCS projects: thermal power plant boiler and turbine redundant DCS control cabinets; petrochemical refinery reactor and distillation unit high-availability DCS racks; metallurgical rolling mill multi-motor synchronous drive integrated DCS panels; pharmaceutical sterile batch production line compact DCS cabinets requiring strict stable power; municipal large water treatment plant pump and fan DCS control boxes; and skid-mounted wellhead monitoring DCS frames for offshore oil & gas facilities. Whether for new DCS cabinet manufacturing, energy-saving renovation of old low-efficiency DCS power systems, or emergency replacement of faulty power units causing full DCS communication interruption, original ABB LXN1604-6 high-efficiency power supply delivers stable, low-energy-consumption power and real-time CEX-bus communication for System 800xA industrial DCS control networks.