Product Overview

The Honeywell TC-ODD321 is a high-density, 32-point Digital Output (DO) module engineered for the Experion® Process Knowledge System (PKS) chassis. This module serves as a critical interface within a Distributed Control System (DCS), allowing the controller to drive a variety of 24 VDC field devices such as solenoid valves, pilot lights, and industrial relays. By providing 32 discrete output channels in a compact form factor, it maximizes I/O density within the control cabinet while maintaining high operational reliability.

The module is architected with dual-group isolation, where the 32 points are divided into two groups of 16, each sharing a separate common. This configuration allows for greater flexibility in wiring and provides an added layer of fault containment. With integrated opto-isolation and sophisticated fault-state programming, the TC-ODD321 ensures that critical industrial processes remain stable and safe even during communication interruptions.

Key Technical Characteristics and Logic Control

The TC-ODD321 is designed to handle demanding electrical loads while providing advanced software-definable safety features.

• High-Density Output Management: Consolidates 32 channels into a single slot, significantly reducing the required hardware footprint for large-scale discrete control.

• Galvanic Opto-Isolation: Every channel is optically isolated (up to 250 VAC), protecting the internal system backplane and sensitive logic circuitry from field-side electrical transients and noise.

• Programmable Fault States: Each output can be independently configured to respond to a "Program" or "Fault" mode. Options include "Hold Last State," "Force ON," or "Force OFF," ensuring predictable behavior during a controller failure.

• Robust Load Handling: Each channel can source up to 100 mA of current, providing sufficient power to drive standard industrial solenoids and signaling devices.

• Thermal Resilience and Derating: Operates across a wide voltage range (10 to 31.2 VDC) and is designed with linear derating curves to maintain performance at elevated temperatures up to 50°C.

• Simplified Installation: Features a standard Experion chassis mount design for rapid integration into existing I/O racks and easy terminal block connection.

Technical Specifications

• Manufacturer: Honeywell

• Model Number: TC-ODD321

• Output Type: Discrete / Digital Output

• Number of Points: 32 Channels (2 groups of 16)

• Nominal Voltage: 24 VDC

• Operating Voltage Range: 10 to 31.2 VDC

• Maximum Load Current: 100 mA per channel

• Isolation Rating: Opto-isolated up to 250 VAC

• Dimensions: 3.5 x 14 x 14.5 cm

• Unit Weight: 0.24 kg

• Origin: USA

Industrial Applications

The Honeywell TC-ODD321 is a fundamental component for discrete actuation in various process sectors:

• Petrochemical Refining: Actuating solenoid valves for pneumatic actuators and emergency isolation loops.

• Power Generation: Controlling status indicators, annunciator panels, and auxiliary motor starters.

• Pharmaceutical Production: Managing discrete sequences for filling, packaging, and clean-room environmental control.

• Water Treatment: Operating chemical dosing pumps and motorized penstock valves via interposing relays.