Honeywell 8C-TAOXB1 51307137-175 Analog Output Module

Technical Overview

The Honeywell 8C-TAOXB1 (part number 51307137-175) is a redundant analog output IOTA module engineered for the Experion PKS C300 and Series 8 distributed control systems . This module converts digital control signals into precise 4–20 mA current outputs for driving valves, actuators, positioners, and other field devices .

The Honeywell 8C-TAOXB1 features a robust redundant IOTA architecture that supports hot-swappable module replacement without system shutdown . It incorporates independent digital-to-analog converters and power supplies for each channel, ensuring automatic fault isolation when a failure occurs . This design maintains continuous 2-oo-2 output operation, meeting SIL 2/3 safety requirements for mission-critical process control applications .

Technical Specifications

Parameter	Specification
Manufacturer	Honeywell
Model Number	8C-TAOXB1
Part Number	51307137-175
Product Type	Redundant Analog Output IOTA Module
System Compatibility	Experion PKS C300, Series 8, Safety Manager
Output Channels	Up to 16 (4–20 mA, HART pass-through)
Resolution	16-bit
Calibrated Accuracy	±0.2% F.S. @ 25°C
Temperature Drift	0.005% F.S./°C
Output Ripple	<100 mV peak-to-peak (250Ω load)
Load Range	50–800 Ω (24 VDC supply)
Response Time	≤80 ms to 1% accuracy; redundancy switchover ≤10 ms
Isolation Voltage	2.5 kVrms (system-to-field)
Power Supply	24 VDC (22–28 V)
Module Current	190 mA (205 mA with HART enabled)
Redundancy	Dual IOTA hot-standby, hot-swappable
Operating Temperature	-40°C to +70°C
Storage Temperature	-40°C to +85°C
Humidity	5% to 95% RH (non-condensing)
Protection Rating	IP20
Conformal Coating	G3 (salt spray, H₂S, moisture resistance)
Hazardous Area Approval	Class I Div 2, Zone 2 (T4)
Certifications	SIL 2/3, CE, UL, FM, CSA, ATEX
Country of Origin	USA

Key Features

Redundant Output Architecture – The Honeywell 8C-TAOXB1 51307137-175 supports dual IOTA hot-standby configurations with automatic failover, ensuring uninterrupted analog output control for mission-critical process loops .

HART Communication Pass-Through – Each output channel includes HART 6/7 pass-through capability, enabling remote configuration, diagnostics, and asset management of smart field instruments without external multiplexers .

High Precision and Stability – The 16-bit DAC and 0.005% FS/°C temperature drift coefficient deliver exceptional accuracy (±0.2% F.S.) across the entire -40°C to +70°C operating range .

G3 Conformal Coating Protection – The module’s G3 coating provides robust protection against moisture, salt spray, and corrosive gases, ensuring reliable operation in harsh offshore, chemical, and refinery environments .

Comprehensive Self-Diagnostics – The module continuously monitors each output channel for open-circuit, short-circuit, and output fault conditions, reporting status to the control system for proactive maintenance .

Hot-Swap Capability – Users can replace the module without powering down the system in redundant configurations, minimizing process disruption and reducing MTTR by up to 90% .

Applications

The Honeywell 8C-TAOXB1 51307137-175 excels in oil and gas refineries, chemical processing plants, power generation facilities, and pharmaceutical manufacturing environments. It provides precise analog output control for valves, variable frequency drives, and positioning systems within Experion PKS and Safety Manager-based distributed control architectures