1. Conflicting Product Descriptions

Search results present two primary, conflicting descriptions of the module’s core function:

Description 1: Modbus RTU Communication Module

This is the most frequently cited function. The module is described as a Modbus RTU Communication Module​ designed for Honeywell’s Experion Process Knowledge System (PKS)​ and TDC 3000​ Distributed Control Systems (DCS). In this role, it acts as a gateway, enabling seamless data exchange between Modbus-compatible field devices (sensors, actuators) and the Honeywell control system via serial communication lines like RS-232/RS-485 .

Description 2: Pulse Input Module

Other sources identify the TK-MDP081​ as a Pulse Input Module​ for Programmable Logic Controller (PLC) or automation systems. This version is designed for precise counting and monitoring of digital pulse signals from devices like flow meters and tachometers, facilitating accurate process measurement .

A third, less detailed description from a supplier also refers to it as a general input/output module with LED status indicators .

2. Technical Specifications (Compiled from Available Data)

The following table consolidates parameters mentioned across various sources. Given the functional discrepancies, these should be verified with official documentation.

3. Suggested Application Scenarios

Depending on its actual function, the module’s applications would differ significantly:

If a Modbus RTU Module:​ It would be critical in industries like oil & gas, chemical, and power generation​ for integrating third-party Modbus devices (e.g., smart sensors, motor drives) into a Honeywell DCS, enabling plant-wide monitoring and control from a central system .

If a Pulse Input Module:​ It would be used for applications requiring precise pulse counting, such as flow measurement in chemical processes, speed monitoring of motors and pumps, or production counting in manufacturing automation​ .

4. Resolution of Information Conflict

The conflicting data suggests several possibilities:

Misidentification:​ The model number TK-MDP081​ might be incorrectly used by distributors for different Honeywell modules.

Variant Existence:​ Honeywell may have produced different modules (communication and pulse input) under the same base model number with different suffixes that are omitted in sales listings.

Inaccurate Sources:​ The information comes from distributor websites that may contain errors.

Recommendation:​ It is crucial to verify the exact specifications of the Honeywell TK-MDP081​ module you are dealing with. Contacting Honeywell technical support directly or consulting official Honeywell product manuals is the only way to confirm its true function, specifications, and intended application.

If you have access to the physical module, checking any labels on the device itself for a full part number and firmware version will provide the most accurate information.