Honeywell 8C-TDIL11 51306858-175 Digital Input Module

Technical Overview

The Honeywell 8C-TDIL11 (part number 51306858-175) is a high-channel-density digital input IOTA module engineered for the Experion PKS Series C distributed control system . This unit acquires discrete 24 VDC signals from limit switches, pushbuttons, and proximity sensors, converting them into digital data for the C300 controller . It provides 32 isolated input channels with onboard excitation power for non-incendive field devices . The Honeywell 8C-TDIL11 supports optional redundancy by adding a second IOM to the IOTA, enhancing system availability for critical applications .

Technical Specifications

Parameter	Specification
Manufacturer	Honeywell
Model Number	8C-TDIL11
Part Number	51306858-175
Product Type	Digital Input IOTA Module
System Compatibility	Experion PKS Series C, C300 Controller
Input Channels	32 (sink/source compatible)
Nominal Input Voltage	24 VDC
Input Voltage Range	18–32 VDC
Input Impedance	4.2 kΩ
ON Sense Voltage/Current	≥13 VDC or ≥3 mA
OFF Sense Voltage/Current	≤5 VDC or ≤1.2 mA
Isolation	1500 VAC RMS
Filter Response	5 ms ±20%
Field Power Selection	Internal or external
Excitation Power	Onboard (non-incendive)
Operating Temperature	-40°C to +70°C
Storage Temperature	-40°C to +85°C
Weight	0.2 kg to 0.45 kg
Mounting	Series C IOTA baseplate, DIN rail
Certifications	CE, UL, CSA, ATEX Zone 2
Country of Origin	USA

Key Features

32 High-Density Input Channels – The module packs 32 discrete input points into a compact IOTA form factor, significantly saving cabinet space compared to traditional termination assemblies.

Onboard Excitation Power – The Honeywell 8C-TDIL11 supplies internal excitation power for non-incendive field devices, eliminating the need for external marshalling power supplies.

Redundancy-Ready Architecture – The module supports optional 1:1 redundancy by adding a second IOM to the IOTA, enabling automatic failover without external wiring.

Configurable Field Power Selection – Users can select either internal or external field power via wiring options, adapting to existing site power distribution schemes.

Comprehensive Self-Diagnostics – Built-in diagnostic functions monitor channel health, detect wiring faults, and report open-circuit or short-circuit conditions to the control system .

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

Applications

The Honeywell 8C-TDIL11 51306858-175 excels in oil and gas refineries, chemical plants, power stations, and pharmaceutical facilities . It reliably captures motor starter feedback, valve limit switch status, emergency stop conditions, and general-purpose discrete signals within Experion PKS-based distributed control systems.