Honeywell 8C-TAOX61 51306981-175 Analog Output Module

Technical Overview

The Honeywell 8C-TAOX61 (part number 51306981-175) is a high-performance analog output IOTA module for the Experion PKS C300 and Series 8 distributed control systems . This module converts digital control signals into precise 4-20 mA or 0-10V DC analog outputs for driving valves, actuators, positioners, and recording instruments . It features a robust redundant IOTA architecture with 16 isolated channels, providing exceptional signal integrity and system availability . The module supports HART communication pass-through on every channel, enabling smart instrument diagnostics and configuration without external hardware .

Technical Specifications

Parameter	Specification
Manufacturer	Honeywell
Model Number	8C-TAOX61
Part Number	51306981-175
Product Type	Analog Output IOTA Module
System Compatibility	Experion PKS C300, Series 8, PlantCruise
Output Channels	16 (fully isolated)
Output Signal Types	4-20 mA, 0-20 mA, 0-10V DC (software selectable)
Resolution	±0.05% of Full Scale (16-bit DAC)
Calibrated Accuracy	±0.35% of Full Scale at 25°C
Temperature Drift	0.005% of Full Scale per °C
Maximum Resistive Load	750-800 Ω
Output Ripple	<100 mV peak-to-peak at 250Ω load
Maximum Open Circuit Voltage	22V
Response Time (Settle to 1%)	≤80 ms
Redundancy Switchover Gap	≤10 ms
Isolation Voltage	1500-2500V DC (channel-to-system)
HART Support	HART 7/6/5 pass-through on each channel
Power Supply	24 VDC nominal (18-32 VDC range)
Power Consumption	≤5W typical
Fail-Safe (FAILOPT)	Per-channel configurable: HOLD LAST VALUE or SHED to SAFE VALUE
Operating Temperature	-40°C to +70°C (coated)
Storage Temperature	-40°C to +85°C
Humidity	5% to 95% RH (non-condensing)
Dimensions	29.5 × 12 × 6.5 cm
Weight	0.38-1.18 kg (depending on assembly)
Mounting	Series 8 I/O rack, IOTA baseplate
Protection Rating	IP20
Conformal Coating	G3 (8C variant) for corrosion resistance
Certifications	SIL 2 capable, CE, UL, CSA, Class I Div 2, Zone 2

Key Features

High-Density 16-Channel Architecture – The 8C-TAOX61 provides 16 independent analog outputs in a single IOTA assembly, maximizing cabinet space efficiency.

HART Communication Pass-Through – Each channel includes built-in HART pass-through, enabling remote diagnostics and configuration of smart field devices without external multiplexers .

Fail-Safe Configuration (FAILOPT) – Users can configure each channel to either hold the last value or shed to a safe value during fault conditions. The output automatically goes to zero if the IOM device electronics fail .

Open-Wire Detection – The module detects and annunciates open field wires with a channel soft failure indication, simplifying maintenance .

Redundancy Support – The module supports 1:1 hardware redundancy with automatic failover. Switchover occurs within 10 ms, ensuring uninterrupted output control for critical loops .

Extensive Self-Diagnostics – Continuous monitoring of each channel for open-circuit, short-circuit, overcurrent, and module faults, reporting status to the control system .

Hot-Swap Capability – Users can replace the module without powering down the system in redundant configurations, minimizing process interruption .

Applications

The Honeywell 8C-TAOX61 51306981-175 excels in oil and gas refineries, chemical processing plants, power generation facilities, pharmaceutical manufacturing, and water treatment applications. It provides precise analog output control for valves, variable frequency drives, positioners, and actuators within Experion PKS and PlantCruise-based distributed control architectures .