Honeywell 51306803-100 I/O Board – K4LCN-16 Redundancy Interface for DCS Systems

Brand Honeywell

Model Honeywell 51306803-100

Product Overview

The Honeywell 51306803-100 is a specialized Enhanced AMR II (Application Module Redundancy II) board engineered for the Honeywell TDC 3000 and Micro TDC 3000 Distributed Control Systems. Within the Honeywell DCS architecture, the Honeywell 51306803-100 serves as the critical redundancy interface that enables two Application Module nodes to operate in a coordinated primary-secondary configuration, ensuring uninterrupted process control even when the primary module experiences hardware degradation or fault conditions. This board connects directly to the K4LCN-16 processor through a ribbon cable visible at the front of the chassis, while separate ribbon cables at the rear interconnect the EAMR I/O boards within each Application Module .

The Honeywell 51306803-100 represents a mature, field-proven component within Honeywell’s legacy DCS portfolio, originally developed to address the high-availability requirements of continuous process industries where even brief control interruptions can result in significant production losses or safety incidents. The board’s architecture supports continuous synchronization of application data between primary and secondary AM nodes, maintaining an exact replica of process control logic, configuration parameters, and runtime state. When the primary Application Module becomes inoperative, the secondary node—equipped with its own Honeywell 51306803-100—assumes control seamlessly, leveraging the synchronized data to maintain process continuity without operator intervention .

While newer Honeywell platforms such as Experion PKS have largely superseded the TDC 3000 in greenfield installations, the Honeywell 51306803-100 remains essential for maintaining operational continuity in the substantial installed base of legacy systems worldwide. The board is also referenced in some documentation as a NIM Modem Board for Micro TDC 3000 applications, reflecting its role in facilitating network communication between distributed control modules within the system architecture .

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	51306803-100
Manufacturer	Honeywell
Product Type	Enhanced AMR II (Application Module Redundancy) Board
System Platform	Honeywell TDC 3000 / Micro TDC 3000
Alternate Designations	EAMR2, EAMRII, 51306803100
Functional Role	Primary-secondary Application Module redundancy interface
Processor Interface	K4LCN-16 board via front ribbon cable
I/O Interconnection	EAMR I/O boards via dual rear ribbon cables
Dimensions (Approx.)	36.7 cm × 36.3 cm × 2 cm
Weight (Approx.)	0.72 kg
Country of Origin	USA
Power Source	System backplane powered
Operating Environment	Industrial control cabinet, moderate vibration and temperature variation
Mounting Location	AM chassis slot with ribbon cable access
Certification Variants	CE Compliant and Non-CE Compliant versions available

Main Features and Advantages

Dedicated Redundancy Architecture: The Honeywell 51306803-100 functions not as a general-purpose I/O module but as a specialized redundancy controller that continuously synchronizes application data between paired Application Module nodes. Unlike software-based redundancy schemes that rely on network communication, the Honeywell 51306803-100 uses direct ribbon cable connections between the primary and secondary AM chassis, ensuring deterministic, low-latency data transfer independent of network load or congestion.

Seamless Failover Capability: When deployed in a properly configured redundant pair, the Honeywell 51306803-100 enables automatic failover from primary to secondary Application Module without process interruption. The secondary node, continuously updated with an exact copy of primary application data, assumes control immediately when the primary becomes inoperative, maintaining control loop execution, operator display updates, and historical data collection without requiring operator action or system restart.

Integrated Network Interface Functionality: In Micro TDC 3000 configurations, the Honeywell 51306803-100 also serves as a NIM Modem Board, providing the physical interface between the Local Control Network (LCN) and Universal Control Network (UCN). The board occupies designated slots within the module chassis and supports twisted-pair connections for short-distance TPLCN applications, consolidating redundancy control and network communication functions into a single interface board .

Robust Industrial Construction: Engineered for continuous operation in demanding process control environments, the Honeywell 51306803-100 maintains signal integrity despite the electromagnetic interference, mechanical vibration, and temperature fluctuations characteristic of industrial control rooms. Its ribbon cable interface design ensures secure, repeatable connections while allowing field replacement without disturbing adjacent modules or backplane traces.

Legacy System Compatibility: The Honeywell 51306803-100 is available in both CE Compliant and Non-CE Compliant variants, accommodating installations subject to different regulatory frameworks. This dual-variant availability ensures that facilities maintaining TDC 3000 systems across global operations can source the appropriate board specification without compromising system certification or operational compliance.