1. Product Introduction & Overview

The 8C‑TDOLA1 is a digital input module in the Honeywell Series 8 I/O ecosystem. It is designed to receive and process discrete field signals (on/off signals) from sensors, switches, and contact closures, and present them to the control system logic. In many DCS / automation systems, digital input modules play a vital role in capturing status signals (e.g. limit switches, alarm switches, discrete events).

The “8C‑” prefix indicates it belongs to the Series 8 family, and is likely to be a coated / protection version to better endure industrial environments (moisture, dust, chemical vapors).

In use, the 8C‑TDOLA1 module plugs into the I/O rack/backplane and interfaces with I/O termination (IOTA) or junction modules that carry the field wiring. It supports diagnostics (fault detection), galvanic isolation, and high‑speed pulse accumulation on certain channels.

2. Brand, Series & Positioning

This module forms part of the digital input layer of the I/O architecture. It is paired with digital output modules, analog I/O modules, and termination modules to form a complete I/O system.

3. Technical Specifications (Parameters)

Here is a table summarizing the known / published specifications of 8C‑TDOLA1, based on available supplier data. Some values may represent typical or approximate figures and should be confirmed with official documentation before final design.

Notes / caveats:

• Some suppliers list dimensions as “3 cm × 31.3 cm × 27.8 cm” which seems unusual (likely a typographical or packaging measure).

• The weight ~0.56 kg is according to vendor sales data.

• The module supports pulse accumulation / high-speed counting on channels 1–16, which is useful in certain signal monitoring applications.

• Operating temperature is given as –40 to +70 °C, indicating a fairly wide industrial range.

4. Applications & Use Cases

The 8C‑TDOLA1 is used in many industrial and automation settings for capturing discrete input signals, particularly where diagnostics, high-speed counting, or robust field connectivity is needed:

• Distributed Control Systems (DCS) and process automation systems, to read status signals from field devices.

• Emergency / Safety Systems, where discrete switches or alarms must be read reliably.

• Flow / Pulse Meters & Counters: Channels with pulse accumulation can count pulses or measure frequency input.

• Manufacturing Automation: Reading limit switches, door sensors, machine states.

• Power & Utility Plants: Monitoring status of breakers, relays, discrete alarms.

• Water / Wastewater / Pumping Systems: Reading level switches, pump run signals, valve positions.

• Oil, Gas & Pipeline Systems: Capturing field discrete events, interlocks, alarms.

• Harsh Environments: Because of coating and isolation, suitable for plants with moisture, dust, or corrosive atmospheres.

By combining it with output modules, analog I/O, and control logic, you can build a complete control station that reacts to digital events in the field.

5. Advantages & Key Strengths

Here are the main advantages of 8C‑TDOLA1 compared with simpler or legacy digital input modules:

1. High Channel Count
   32 input channels in one module reduces the rack footprint and wiring complexity.

2. Pulse Accumulation Support
   Channels 1–16 can perform high-speed counting or frequency measurement rather than simple on/off detection.

3. Broad Input Compatibility
   Supports TTL/CMOS style digital signals and non-polarized inputs.

4. Built-in Diagnostics & Fault Detection
   Detects open wires, short circuits, and other anomalies, enhancing system safety and reliability.

5. Galvanic Isolation
   Electrical isolation between system / logic side and field inputs reduces noise and interference risk.

6. Wide Operating Range
   Capable of –40 °C to +70 °C, for use in demanding industrial environments.

7. Coated / Protected Version
   The coated version provides additional protection against humidity, dust, and corrosive atmospheres, increasing service life in harsh sites.

8. Modular & Replaceable Design
   Can be removed or replaced with minimal disruption in a modular rack system.

These advantages make it a robust choice for digital input in mission-critical automation systems.

6. Recommended Related & Popular Models

6.1 Related / Same Series / Function Modules

Below are five modules similar or complementary in the same digital I/O / input family:

These modules differ in channel count, analog vs digital input, or variant features like counting or signal filtering. In a system you may mix DI, DO, AI, AO modules depending on needs.

6.2 Other Popular Honeywell Modules (Same Brand)

Here are five commonly referenced Honeywell modules used in the same control ecosystem: