Honeywell TK Series Modules | TK-IAH161 Analog Input Module

Technical Dossier

Product Details And Specifications

Honeywell TK Series: Comprehensive Module Range and Technical Overview

The Honeywell TK Series I/O modules are a core hardware layer within the TotalPlant Solution (TPS) and Experion PKS distributed control system platforms. Deployed across heavy industrial sectors — including petroleum refining, petrochemical complexes, nuclear power generation, LNG terminals, and continuous-process chemical plants — TK Series modules provide the physical interface between field instrumentation and the DCS control network. Installations of this series are documented across facilities operated by major EPC contractors and national oil companies in North America, the Middle East, and Asia-Pacific. The series is characterized by its backplane-mounted architecture, deterministic scan cycle, and compatibility with the Universal Control Network (UCN) and Local Control Network (LCN) bus structures. Due to the long operational lifecycles typical of heavy process industries (15–30 years per installation), TK Series modules remain in active service at a large installed base even as the product line has entered its maintenance and end-of-life phase.

The Evolution of TK Series Architecture

The TK Series originated as the I/O subsystem for Honeywell's TotalPlant Solution platform, which itself evolved from the earlier TDC 3000 and PlantScape architectures. Early TK modules operated exclusively on the UCN (Universal Control Network), a deterministic token-passing coaxial network running at 5 Mbps. As Honeywell transitioned its flagship DCS offering to the Experion PKS platform (introduced in 2000), TK Series I/O was retained as a compatible field I/O layer, accessible via the C200/C300 controller series through the IOLIM (I/O Link Interface Module) gateway. This backward compatibility was a deliberate design decision to protect customer capital investment in existing field wiring and marshalling cabinets.

The architectural evolution can be summarized in three phases: (1) TDC 3000 / TPS era — TK modules operated natively on UCN, managed by HPM (High-Performance Process Manager) and APM (Advanced Process Manager) controllers; (2) Experion PKS integration era — TK I/O accessed via IOLIM bridges, enabling C200/C300 controllers to read TK-series field signals without rewiring; (3) Migration / lifecycle extension era — as Honeywell formally discontinued new TK module production, the installed base shifted to reliance on certified refurbished and surplus inventory for maintenance, with Honeywell's own lifecycle services and third-party MRO suppliers filling the gap. Key compatibility constraints include: TK modules require a specific backplane slot assignment; mixing module generations within a single I/O assembly requires firmware version alignment; and certain high-density modules (e.g., 32-channel variants) are not backward-compatible with early HPM firmware revisions below R500.

TK Series Full Catalog & Functionalities (SKU List)

Analog Input (AI) Modules

• TK-IAH161: 16-channel analog input, high-level, 4–20 mA / 1–5 V, HART-capable field interface
• TK-IAH161-R: Redundant-certified variant of TK-IAH161 for safety-critical AI loops
• TK-IAH081: 8-channel analog input, high-level, 4–20 mA, single-ended configuration
• TK-IAHL01: 16-channel analog input, low-level thermocouple/mV input, CJC compensation onboard
• TK-IAHL02: 8-channel analog input, low-level RTD (Pt100/Pt1000), 3-wire and 4-wire support

Analog Output (AO) Modules

• TK-OAH161: 16-channel analog output, 4–20 mA, loop-powered, short-circuit protected
• TK-OAH081: 8-channel analog output, 4–20 mA, isolated outputs per channel
• TK-OAH161-R: Redundant analog output, 16-channel, for final control element applications

Digital Input (DI) Modules

• TK-IDY161: 16-channel digital input, 24 VDC, dry contact / wet contact selectable
• TK-IDY321: 32-channel digital input, 24 VDC, high-density marshalling cabinet format
• TK-IDY161-R: Redundant 16-channel DI module for critical interlock monitoring
• TK-IDYH01: 16-channel digital input, 120 VAC, for legacy field device compatibility

Digital Output (DO) Modules

• TK-ODY161: 16-channel digital output, 24 VDC, solid-state relay, 0.5 A per channel
• TK-ODY081: 8-channel digital output, relay contact, 2 A per channel, for solenoid valve driving
• TK-ODY321: 32-channel digital output, 24 VDC, high-density format

Power Supply Modules

• TK-PRS021: Redundant power supply module, 24 VDC output, 20 A, hot-swap capable
• TK-PRS011: Standard power supply, 24 VDC, 10 A, single-rail for non-redundant cabinets

Communication & Controller Modules

• TK-CCR013: UCN communication controller, node interface for HPM/APM process managers
• TK-FTEB01: Fault-tolerant Ethernet bridge, connects TK I/O to Experion C300 via FTE network

Sourcing Hard-to-Find & Obsolete TK Series Parts

Honeywell formally ended new production of the majority of TK Series modules. Replacement with Experion Series C I/O (EHIA, EHOA, EDIO, EDOB) is the OEM-recommended migration path, but full cabinet rewiring and engineering costs make immediate migration economically prohibitive for most operating facilities. DriveKNMS maintains a dedicated inventory program for TK Series lifecycle extension, sourcing modules through decommissioned plant auctions, certified surplus channels, and direct buyback programs. All units are serialized, and provenance documentation is retained. For modules with known firmware dependencies (e.g., TK-IAH161 requiring HPM firmware R520 or above for HART pass-through), DriveKNMS technical staff verify firmware revision prior to shipment. Lead times for common AI/AO modules are typically 3–7 business days from stock; rare variants such as TK-IAHL02 and TK-CCR013 are sourced on a request basis with a 10–21 day fulfillment window.

Quality Control for the TK Series Range

TK Series modules use a proprietary backplane bus connector (96-pin DIN 41612 Type C) and an internal ASIC-based signal conditioning architecture. Standard bench testing procedures applied to each unit include: (1) backplane connector inspection under 10× magnification for pin deformation and oxidation; (2) powered functional test using a Honeywell-compatible HPM simulator or equivalent UCN node emulator to verify channel-by-channel signal integrity; (3) for analog modules, a 5-point calibration check across the 4–20 mA range (4, 8, 12, 16, 20 mA) with deviation tolerance ±0.1% of full scale; (4) for digital modules, contact resistance measurement on relay-output variants (threshold: <100 mΩ per contact); (5) thermal soak at 55°C for 2 hours to screen latent component failures; (6) final firmware version read-back and logging. Modules that fail any single test criterion are quarantined and not offered for sale. Test records are retained for 3 years and available to customers on request.