Honeywell 8U-TDIL11 51306858-175 Digital Input Module

Technical Overview

The Honeywell 8U-TDIL11 is a digital input IOTA module engineered for the Experion PKS Series C distributed control system and the C300 controller platform . This module monitors up to 32 discrete field signals, converting 24 V DC signals from switches, sensors, and safety interlocks into reliable digital data for the controller . The 8U-TDIL11 serves as the non-coated version (0°C to +60°C), while the 8C-TDIL11 features G3 conformal coating for extended temperature and corrosive environments . The part number 51306858-175 refers to the complete kit that includes the input board and all necessary installation accessories .

Technical Specifications

Parameter	Specification
Manufacturer	Honeywell
Model Number	8U-TDIL11
Part Number	51306858-175
Product Type	Digital Input IOTA Module
System Compatibility	Experion PKS Series C, C300 Controller
Input Channels	16 or 32 (depending on variant)
Nominal Input Voltage	24 V DC
Input Voltage Range	18–30 V DC
Input Current per Channel	≤10 mA
Input Impedance	≥10 kΩ
Response Time	<1 ms (high-speed acquisition)
SOE Resolution	1 ms (sequence of events recording)
Isolation	2500 V DC (optically isolated)
Power Consumption	≤2.5 W
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Weight	Approx. 0.4 kg
Dimensions	210 x 100 x 45 mm
Protection Rating	IP20
Certifications	CE, UL, CSA, Class I Div 2, Zone 2
Country of Origin	USA

Key Features

High Channel Density – The Honeywell 8U-TDIL11 supports 16 or 32 discrete input channels in a compact IOTA form factor, saving valuable cabinet space .

High-Speed Signal Acquisition – The module delivers response times under 1 ms with 1 ms SOE resolution, enabling precise event sequence recording for critical process monitoring .

Optical Isolation – The module provides 2500 V DC isolation between input channels and the system, effectively protecting control electronics from electrical noise and ground loops .

Built-in Diagnostics – The module includes open-circuit detection, channel status monitoring, and power/communication fault alarms, simplifying troubleshooting and reducing maintenance time .

Hot-Swap Capability – Users can replace the module without powering down the system, minimizing process interruption during maintenance .

IOTA Architecture – The integrated termination assembly design combines electronics and field terminations, eliminating the need for a separate chassis and simplifying installation .

Applications

The Honeywell 8U-TDIL11 excels in oil and gas refineries, chemical processing plants, power generation facilities, and pharmaceutical manufacturing. It provides reliable digital input acquisition for motor status monitoring, valve position feedback, emergency shutdown interlocks, and general-purpose discrete signal acquisition within Experion PKS-based distributed control systems .