Honeywell SP-IHARTP Remote Terminal Unit – Obsolete TDC3000 Spare Part

Technical Dossier

Product Details And Specifications

Honeywell SP-IHARTP Remote Terminal Unit – Obsolete TDC3000 Spare Part

When a Remote Terminal Unit fails inside a Honeywell TDC3000 distributed control system, the consequences extend far beyond a single module replacement. A forced migration to a modern DCS platform — driven solely by the unavailability of one legacy component — routinely carries engineering, commissioning, and production-downtime costs measured in the millions of dollars. The SP-IHARTP is a discontinued hardware item. DriveKNMS maintains verified physical stock of this module specifically to prevent that scenario.

Technical Specifications

Note: Electrical parameters for this discontinued module are not published in current Honeywell documentation. DriveKNMS does not fabricate specifications. Confirmed technical data is provided upon request with unit inspection report.

Solving the Discontinued Hardware Crisis

The Honeywell TDC3000 platform was the backbone of process automation across petrochemical, refining, pulp and paper, and power generation facilities for decades. Many of these installations remain in active production today — not because operators are unaware of the platform's age, but because the cost and operational risk of a full DCS migration cannot be justified against current capital budgets.

The SP-IHARTP Remote Terminal Unit occupies a specific communication and I/O role within the TDC3000 architecture. It is not a generic module that can be substituted with a modern equivalent without significant re-engineering of the control logic, field wiring, and operator interface. For facilities running this platform, the choice is binary: source the original hardware, or commit to a system-wide replacement project.

DriveKNMS sources SP-IHARTP units through decommissioned plant buybacks, authorized distributor closeouts, and long-term inventory partnerships. Each unit passes through a documented inspection process before it is offered for sale. This is not surplus speculation — it is a deliberate strategy to support facilities that have made a rational decision to extend the operational life of a proven, stable control system.

Condition & Reliability Assurance

Discontinued hardware carries age-related failure risks that standard incoming inspection does not address. DriveKNMS applies a 5-step reconditioning and verification protocol to all SP-IHARTP units before dispatch:

• Step 1 – Visual and Mechanical Inspection: Board-level examination for physical damage, pin corrosion, connector oxidation, and housing integrity.
• Step 2 – Electrolytic Capacitor Assessment: Aging electrolytic capacitors are the primary failure mode in legacy RTU hardware. Each unit is evaluated for capacitor condition; units with degraded capacitors are recapped before certification.
• Step 3 – Firmware Version Verification: The firmware revision is confirmed and documented. Compatibility with the target TDC3000 system version is verified prior to shipment.
• Step 4 – Functional Power-On Test: The unit is powered and tested under controlled conditions to confirm baseline operational status.
• Step 5 – Final Documentation Package: Each unit ships with a condition report, firmware record, and test log. This documentation supports your internal maintenance records and audit requirements.

Key Features for System Maintenance

• Drop-in replacement: The SP-IHARTP installs directly into the existing TDC3000 rack slot. No hardware modification to the host system is required.
• No reprogramming required: Control logic, tag assignments, and operator displays remain unchanged. Maintenance technicians familiar with TDC3000 can complete the swap without specialist contractor involvement.
• Avoids engineering reconstruction costs: A like-for-like replacement eliminates the need for I/O remapping, loop reconfiguration, or safety system revalidation — costs that accompany any platform migration.
• Extends asset life by 5–10 years: A single verified spare can defer a multi-million dollar DCS upgrade project. For facilities with defined decommission timelines, this represents a direct capital preservation strategy.
• Supports regulatory continuity: Facilities operating under process safety management (PSM) or functional safety (IEC 61511) frameworks benefit from maintaining a validated, unchanged control system configuration.

FAQ

What warranty applies to a discontinued module?
DriveKNMS provides a 90-day functional warranty on all tested and certified units. New sealed units carry a 180-day warranty. Warranty terms are confirmed in writing at the time of order.

How do I confirm the unit is genuine and not counterfeit?
All SP-IHARTP units sourced by DriveKNMS are traceable to documented supply chain origins. Serialization, board markings, and firmware signatures are verified against known-good references. Counterfeit detection is part of the Step 1 inspection protocol.

Should I purchase more than one unit?
For any TDC3000 installation with a defined operational horizon of 3 years or more, holding a minimum of two SP-IHARTP spares is a standard risk mitigation practice. Stock of this module is finite and non-replenishable. Once global inventory is exhausted, no further supply will exist. Procurement decisions deferred today carry a higher cost and higher risk of failure tomorrow.

Can DriveKNMS source other TDC3000 components?
Yes. DriveKNMS specializes in obsolete and hard-to-find automation components across Honeywell, ABB, Siemens, Yokogawa, and other major DCS and PLC platforms. Contact us with your full bill of materials for a consolidated sourcing assessment.

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