Product Overview
The Honeywell 8C-TAIX61, supplied under the complete part number 51306977-175, is the coated redundant analog input IOTA (Input Output Termination Assembly) in Honeywell’s Series 8 I/O architecture, serving the Experion PKS, Experion LX, and PlantCruise platforms built around the C300 controller. As the red-variant AI IOTA, this termination board hosts the Series 8 analog input module and provides the field-wiring interface for sixteen single-ended 4–20 mA channels, accepting signals from both 2-wire loop-powered and 4-wire self-powered transmitters while passing HART digital communication through to the host for device diagnostics and configuration.
The 8C-TAIX61 forms the passive termination layer of the analog input chain, pairing with the 16-bit AI IOM to deliver hardware accuracy of ±0.075% of full-scale at reference temperature, a 50 ms input scan rate, and galvanic isolation between system and field. Its conformally coated PCB carries the “8C-” designation defined by Honeywell as G3 corrosive-gas resistance per ISA S71.04, making the board suitable for installation in cabinets exposed to the harsh atmospheres common in refineries, offshore platforms, and chemical processing units where uncoated electronics degrade prematurely.
Positioned within Honeywell’s current-generation distributed control architecture, the Honeywell 8C-TAIX61 supports fully redundant analog input configurations — a second IOTA and IOM pair can mirror the primary channel to protect critical loops against single-point failure. Hot-swap removal and insertion under power is supported, so a failed board can be replaced without shutting down the controller or disturbing adjacent loops. As the Experion Series 8 estate continues to expand across power generation, oil and gas, chemicals, and pharmaceuticals, the 8C-TAIX61 remains an actively deployed, factory-supported component, and maintaining verified spares protects process availability in applications where analog measurement accuracy is directly tied to product quality and operational safety.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 8C-TAIX61 |
| Part Number | 51306977-175 |
| Manufacturer | Honeywell |
| Product Type | Analog Input IOTA (Input Output Termination Assembly), Red / Redundant Coated Variant |
| System Platform | Honeywell Experion PKS / Experion LX / PlantCruise, Series 8 I/O with C300 Controller |
| Channel Capacity | 16 single-ended analog input channels |
| Input Signal | 4–20 mA (through 250 Ω), 2-wire and 4-wire transmitters |
| Resolution | 16-bit A/D converter |
| Hardware Accuracy | ±0.075% of full-scale (23.5 ±2 °C); ±0.15% (0 to 60 °C) |
| Scan Rate | 50 ms |
| Voltage Rating | 24 VDC |
| Isolation | Galvanic isolation, 1000 VAC RMS / ±1000 VDC (via Icoupler in IOM) |
| Signal Integrity | CMRR 70 dB; NMR 19 dB @ 60 Hz; crosstalk −60 dB; single-pole RC filter −3 dB @ 6.5 Hz |
| Maximum Input Voltage | ±30 V (no damage) |
| PCB Coating | Conformal coated, G3 corrosive gas rating per ISA S71.04 |
| Environmental Rating | 0–50 °C external / 0–60 °C internal; 5–95% RH non-condensing |
| Certifications | CSA Class I Div 2 Grp ABCD; ATEX / IECEx Zone 2 Ex ec IIC T4 Gc; CE, FCC, RoHS |
| Dimensions / Weight | 31.3 × 27.8 × 3 cm; 0.56 kg |
| Mounting | Series 8 IOTA baseplate in Series 8 cabinet |
| Hot-Swap Support | Removal and insertion under power |
