1. Product Introduction & Overview

The 8C‑TDODB1 (digital output module) is part of Honeywell’s Series 8 I/O system used in distributed control / process control systems (such as C300 / Experion PKS environments). It is a 24 V DC digital output module (DO module) that provides up to 32 individual digital output channels. It supports both internal and external field power excitation, short‑circuit protection, selectable output modes (latched, pulsed, PWM), and “safe state” (FAILOPT) behavior configurations per channel.

This module is used to drive discrete actuators such as solenoid valves, contactors, relays, or other loads requiring on/off control. Because it is designed for industrial control systems, it emphasizes robustness, diagnostics, isolation, flexibility, and safe failover behavior.

The “8C‑” prefix indicates it is part of Series 8 and the “C” often implies a coated or protected version (for environmental protection) in Honeywell’s naming conventions.

In a control system rack, the 8C‑TDODB1 module plugs into the backplane (or I/O shelf) and interfaces with an I/O termination (IOTA) or junction module to connect to field wiring.

2. Brand, Series & Product Positioning

This module is one of the core building blocks in Honeywell’s I/O portfolio and is often paired with other module types (analog input, digital input, analog output) in the same I/O rack or shelf.

3. Technical Specifications (Parameters)

Here is a summary table of the known / commonly cited technical parameters for 8C‑TDODB1:

Note: Some sources also cite alternate dimensions of 22.1 cm × 12.1 cm × 6.3 cm for modules in the same family (coated DO modules) and about 0.35 kg weight. Use the datasheet from your supplier or manufacturer for the definitive size.

4. Applications & Use Cases

The 8C‑TDODB1 module is commonly applied in the following environments and scenarios:

• Industrial Process Control (Chemical / Petrochemical / Refining): driving on/off valves, solenoids, interlocks, alarms

• Safety / Emergency Shutdown (ESD) Systems: when discrete outputs need to go to safe states under fault

• Automation / Manufacturing Plants: actuating motors, contactors, discrete equipment

• Power Generation & Utilities: controlling discrete auxiliary devices (e.g. breakers, pumps)

• Water & Wastewater Treatment: driving valves, pumps, discrete actuators

• Oil & Gas Production / Pipeline Control: remote discrete actuation, field interface

• Any distributed control system requiring robust, diagnosed, reliable digital output control

Because it supports selectable output modes and safe state behavior, it is particularly useful in systems where fault management and predictable failure behavior are required.

5. Advantages & Key Selling Points

Here are the main advantages of 8C‑TDODB1 in industrial control contexts:

1. High Channel Count
   Offers 32 output channels in a single module, reducing rack footprint.

2. Selectable Output Modes
   Each channel can be set to latched, pulsed, or PWM, giving flexibility for a variety of load types.

3. Safe State (FAILOPT) Behavior
   In failure or fault conditions, outputs can be made to hold their last value or go to a preconfigured “safe” value.

4. Dual Power Option / Isolation Capability
   Using external field power allows galvanic isolation between system and field. This improves noise immunity and failure tolerance.

5. Short-Circuit Protection & Diagnostics
   Each channel is protected, and the module supports internal fault diagnostics, improving safety and reliability.

6. Proven Integration with Honeywell Ecosystem
   Seamless compatibility with I/O termination modules, internal backplanes, and DCS control logic.

7. Compact, Modular Design
   Easy to install, replace, and maintain. Minimal module footprint for many outputs.

8. Environmental Robustness
   Coated version offers better immunity to moisture, dust, and corrosive atmospheres.

These features make the module reliable under varying loads, flexible to system requirements, and safer in failure modes.

6. Recommended Models & Popular Honeywell Modules

6.1 Related / Same Series or Functional Modules

Here are 5 alternative or complementary modules in the same I/O / digital output domain:

These modules differ by channel count, redundancy support, coating, footprint, or output type (solid state vs relay). In a system design, you choose based on required outputs, reliability, and space.

6.2 Other Popular Honeywell Models (Other Types, Same Ecosystem)

Below are 5 Honeywell modules (other I/O or controller modules) typically used in the same control system environment: