Description

The ABB DKTFM418B 3BHB015651P0001 is a dual-port fiber optic communication interface module designed for ABB’s AC 800M programmable automation controllers(PACs),enabling high-speed,electrically isolated,and redundant data exchange between controllers,I/O stations,and engineering workstations.As a core component of ABB’s ControlNet architecture,it ensures deterministic,low-latency communication in mission-critical applications where electromagnetic interference,long distances,or safety integrity demand optical transmission.

Application Scenarios

At a Middle Eastern LNG export terminal,control engineers faced persistent network instability due to ground potential differences between the central control room and remote compressor skids—located over 800 meters apart.Copper-based Ethernet links suffered frequent CRC errors during motor startups,risking process interruption.They replaced the standard copper modules with the ABB DKTFM418B 3BHB015651P0001 on all AC 800M PM866 controllers and S800 I/O stations.Using single-mode fiber,they established a fully redundant ring topology with<2 ms failover.The DKTFM418B’s complete galvanic isolation eliminated ground loops,while its 1 Gbps full-duplex capability handled heavy HMI and historian traffic without jitter.Over three years of operation,zero communication-related trips occurred—proving the DKTFM418B as the backbone of resilient,long-haul industrial networking.

Parameter

Main Parameters Value/Description

Product Model ABB DKTFM418B 3BHB015651P0001

Manufacturer ABB(now Hitachi Energy Automation)

Product Category Dual-Port Fiber Optic Communication Module for AC 800M

Interface Type 2×LC duplex fiber ports(SC variants available via adapter)

Fiber Type Supported Single-mode(OS2)or multimode(OM3/OM4)–field-configurable

Data Rate 1 Gbps full-duplex per port(Gigabit Ethernet over fiber)

Protocol Support ABB ControlNet(real-time),Modbus TCP,OPC UA tunneling

Redundancy Supports PRP,HSR,and custom ring protocols via AC 800M firmware

Electrical Isolation>5 kV RMS between backplane and fiber interfaces

Operating Temperature-25°C to+70°C(extended industrial range)

Installation Slot Dedicated comms slot in AC 800M CPU modules(e.g.,PM864,PM866)

Diagnostic Features Link status LEDs,fault logging in Control Builder M,SNMP monitoring

Technical Principles and Innovative Values

True Galvanic Isolation:The ABB DKTFM418B 3BHB015651P0001 uses optical transceivers with no electrical path between the controller backplane and field network—eliminating ground loops,lightning-induced surges,and EMI from VFDs or switchyards.

Dual-Homing for Zero Downtime:Each port can connect to separate network segments,enabling active/standby or load-balanced topologies.In redundant AC 800M pairs,the DKTFM418B synchronizes application states at microsecond precision.

Long-Distance Reach Without Repeaters:With single-mode fiber,the DKTFM418B supports links up to 20 km—ideal for distributed facilities like pipelines,solar farms,or offshore platforms.

Seamless Integration with Control Builder M:No driver installation needed;the module appears as a native network interface,supporting VLAN tagging,QoS,and firewall rules for IT/OT convergence.

Future-Proof Physical Layer:LC duplex connectors align with modern data center standards,simplifying cabling and enabling easy migration to higher-layer protocols like Time-Sensitive Networking(TSN)in future firmware updates.

Application Cases and Industry Value

In a European nuclear power plant’s reactor protection system upgrade,regulatory auditors mandated complete electrical separation between safety and non-safety networks.The engineering team deployed dual ABB DKTFM418B 3BHB015651P0001 modules in each PM872 safety controller—one for the safety-grade ControlNet,another for the plant-wide operations network.The fiber interfaces ensured no conductive path existed between zones,satisfying IEC 61513 requirements.During a simulated loss-of-coolant accident test,the DKTFM418B maintained uninterrupted data flow between redundant controllers across 300 meters of containment building,with synchronization error<500 ns.Plant operators now cite the module’s reliability as foundational to their digital I&C modernization success.

Related Product Combination Solutions

ABB PM866 3BSE038680R1:High-performance AC 800M CPU that hosts the DKTFM418B for large-scale DCS applications.

ABB PM872 3BSE043740R1:Safety-rated controller often paired with DKTFM418B in SIL 3 nuclear or chemical processes.

ABB TB850 3BSE018130R1:S800 I/O baseplate used in remote stations connected via DKTFM418B fiber links.

ABB CI874 3BSE043850R1:Alternative communications module for PROFINET or Ethernet/IP—but DKTFM418B remains preferred for EMI-heavy or long-distance fiber needs.

ABB FTB850 3BSE018132R1:Terminal block for S800 I/O,completing the remote station connected over fiber by DKTFM418B.

ABB Control Builder M:Engineering tool used to configure redundancy,IP addressing,and diagnostics for the DKTFM418B.

Corning SMF-28e+:Recommended single-mode fiber cable for>1 km DKTFM418B installations.

ABB NSD850 3BSE041225R1:Network switch module that can extend DKTFM418B-based rings to additional I/O clusters.

Installation,Maintenance,and Full-Cycle Support

Installing the ABB DKTFM418B 3BHB015651P0001 requires insertion into the designated communications slot of an AC 800M CPU(e.g.,PM866).Fiber patch cables with LC connectors are then routed to switches or peer controllers,ensuring proper bend radius and strain relief.Configuration is performed entirely in Control Builder M—assigning IP addresses,enabling redundancy protocols(e.g.,Rapid Spanning Tree),and setting up diagnostic alarms.No optical power calibration is needed;the module auto-negotiates link parameters.

Maintenance is minimal:the front-panel LEDs indicate link status and activity,while detailed fault logs(e.g.,“Port 1:Signal Loss”)appear in the controller’s event buffer.The module’s solid-state design has no moving parts or consumables,ensuring decades of service in stable environments.Every DKTFM418B we supply undergoes burn-in testing at temperature extremes,optical power validation,and interoperability checks with live AC 800M systems.Backed by a 24-month warranty and direct access to ABB-certified network engineers,our units guarantee your control network stays fast,secure,and always connected—even in the harshest industrial landscapes.

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