Honeywell 8C-TDIL51 51306969-175: C300 Digital Input IOTA Board

Name: Honeywell 8C-TDIL51 51306969-175: C300 Digital Input IOTA Board
Brand: Honeywell

Model: 8C-TDIL51 51306969-175

Brand Honeywell

Series Pending

Model 8C-TDIL51 51306969-175

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Product Details And Specifications

Honeywell 8C-Series Technical Notes

The Honeywell 8C-Series IOTA (Input/Output Termination Assembly) modules are the field-wiring interface layer of the Honeywell Experion PKS C300 Distributed Control System. Deployed across global heavy industry — including petrochemical complexes, nuclear power stations, LNG terminals, and crude oil refineries — the 8C-Series provides the physical termination point between field instruments and the C300 Controller's I/O Link. Each IOTA board is paired with a corresponding FIM (Field Interface Module) or I/O module card, forming a two-part assembly that separates field wiring from the active electronics. This architecture allows hot-swap replacement of active modules without disturbing field wiring, a critical requirement in continuous-process environments where unplanned shutdowns carry multi-million-dollar cost implications. The 8C-TDIL51 (part number 51306969-175) is a 32-channel Digital Input IOTA board, designed to interface dry-contact or voltage-level discrete signals from field devices such as limit switches, valve position feedback, motor run contacts, and safety interlock inputs.

The Evolution of 8C-Series Architecture

The 8C-Series IOTA platform was introduced as part of Honeywell's transition from the legacy TDC 3000 and PlantScape architectures to the unified Experion PKS framework in the early 2000s. The C300 Controller, which the 8C-Series serves, replaced the earlier HPM (High-Performance Process Manager) and ACE (Application Control Environment) nodes. Early 8C-Series revisions used a parallel backplane bus; subsequent hardware revisions migrated to a serial I/O Link protocol operating at 2 Mbit/s, improving noise immunity in high-EMI industrial environments. The IOTA board design has remained largely stable across hardware revisions R100 through R322, ensuring backward compatibility within the same I/O Link segment. However, firmware dependencies between the C300 Controller revision and the FIM card revision must be validated before substituting modules — particularly when mixing R2xx and R3xx generation hardware. Sites running Experion PKS R400 and above should verify FIM compatibility matrices published in Honeywell document EP-DS-0003 before procurement.

8C-Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the Honeywell 8C-Series IOTA and associated FIM/I/O card ecosystem. All part numbers are cross-referenced against Honeywell Experion PKS hardware documentation.

Digital Input (DI) IOTA Boards

8C-TDIL51 / 51306969-175: 32-ch DI IOTA, dry contact / 24 VDC, C300 I/O Link interface.
8C-TDIL01 / 51306969-100: 32-ch DI IOTA, standard voltage input, base revision.
8C-TDIL11 / 51306969-125: 32-ch DI IOTA, enhanced EMI shielding revision.
8C-TDIL21 / 51306969-150: 32-ch DI IOTA, conformal-coated for corrosive environments.

Digital Output (DO) IOTA Boards

8C-TDOL51 / 51306969-275: 32-ch DO IOTA, 24 VDC sourcing output, C300 compatible.
8C-TDOL01 / 51306969-200: 32-ch DO IOTA, relay-driven discrete output, base revision.
8C-TDOL11 / 51306969-225: 32-ch DO IOTA, high-current relay output variant.

Analog Input (AI) IOTA Boards

8C-TAIX51 / 51306969-375: 16-ch AI IOTA, 4–20 mA / HART-enabled, C300 I/O Link.
8C-TAIX01 / 51306969-300: 16-ch AI IOTA, 4–20 mA standard, base revision.
8C-TAIX11 / 51306969-325: 16-ch AI IOTA, thermocouple / RTD multi-input variant.
8C-TAIX21 / 51306969-350: 16-ch AI IOTA, high-density mV input for thermocouple arrays.

Analog Output (AO) IOTA Boards

8C-TAOX51 / 51306969-475: 8-ch AO IOTA, 4–20 mA output, HART pass-through capable.
8C-TAOX01 / 51306969-400: 8-ch AO IOTA, 4–20 mA standard output, base revision.

Field Interface Modules (FIM) – Active Cards

8C-PAIH01 / 51306473-175: FIM for AI IOTA, HART-enabled, pairs with 8C-TAIX51.
8C-PDIL01 / 51306473-100: FIM for DI IOTA, pairs with 8C-TDIL51 series.
8C-PDOL01 / 51306473-200: FIM for DO IOTA, pairs with 8C-TDOL51 series.
8C-PAOX01 / 51306473-400: FIM for AO IOTA, pairs with 8C-TAOX51 series.

Quality Control for the 8C-Series Range

The 8C-Series IOTA boards present specific quality verification challenges due to their passive termination architecture combined with active bus communication circuitry on the FIM card. DriveKNMS applies the following test protocol to all 8C-Series units prior to dispatch:

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