Honeywell 8C-TDOD51 | 32-Channel Digital Output Relay Module

Product Overview

The Honeywell 8C-TDOD51 is an advanced Digital Output (DO) Relay Module designed for the Experion PKS platform. This module provides a robust interface between the DCS logic and field equipment by utilizing 32 isolated Form-C dry contacts. 

Technical Specifications

• Model Number: 8C-TDOD51 (often written as 8C-TDOD51)

• Part Number: 51306975-175

• Output Channels: 32 Channels

• Output Type: Isolated Form-C Relay (Dry Contact)

• Module Voltage: 24 VDC

• Max Load Voltage: 30 VDC

• Max Load Current: 100 mA per channel / 3.2 A total per module

• Galvanic Isolation: 1000 VAC RMS or ±1500 VDC

• Environmental Protection: Conformal Coated (8C Series)

Key Features and Engineering Advantages

• 32-Channel Form-C Versatility: Each channel provides a Single Pole Double Throw (SPDT) configuration (Common, Normally Open, Normally Closed). This allows engineers to wire for "fail-safe" open or closed states depending on the application requirements.

• True Dry Contact Interface: By providing a switch without a built-in voltage source, the module allows for the use of external "wetting" voltages up to 30 VDC. This is ideal for interfacing with third-party PLC skids or legacy hardware.

• Robust Galvanic Barrier: The 1000 VAC RMS isolation rating ensures that high-voltage transients or ground loops in the field wiring do not propagate back to the sensitive Series 8 I/O processors.

• Series 8 Vertical Efficiency: The module's vertical mounting orientation on the IOTA optimizes cabinet airflow and significantly reduces the required DIN rail footprint compared to horizontal 32-channel modules.

• Conformal Coating for Harsh Zones: The "8C" designation means this module is ready for "Class G3" environments, protecting against the moisture and sulfurous gases found in refineries and chemical plants.