A flexible acquisition cycle for incompletely defined fieldbus protocols.

Area of Science:

• Industrial Automation and Control Systems
• Network Protocols and Data Acquisition
• Real-Time Systems Engineering

Background:

• Real-time data acquisition from fieldbuses is crucial but challenged by network type and protocol limitations.
• Incompletely defined fieldbus protocols, such as Modbus ASCII/RTU and M-bus, often lack explicit time variables essential for temporal data accuracy.
• Existing hardware and protocols present limitations in achieving precise temporal data location for industrial automation.

Purpose of the Study:

• To define a flexible acquisition cycle for real-time data acquisition from diverse fieldbuses.
• To introduce a Base Station Gateway (BSG) capable of adding timestamps to data for temporal location.
• To propose a cost-effective extension for the Modbus protocol to enhance its real-time data acquisition capabilities.

Main Methods:

• Development of a flexible acquisition cycle based on the Master-Slave architecture.
• Implementation of a Base Station Gateway (BSG) as the Master station.
• Design of a simple, low-cost extension for the Modbus protocol using existing hardware.

Main Results:

• The proposed Base Station Gateway (BSG) successfully adds timestamps, enabling precise temporal location of acquired data.
• The flexible acquisition cycle accommodates various fieldbus types, including those with incompletely defined protocols.
• A practical and economical extension for Modbus protocol was developed, enhancing its real-time data acquisition functionality.

Conclusions:

• The Base Station Gateway (BSG) provides a viable solution for real-time data acquisition challenges in industrial environments.
• The proposed method enhances temporal accuracy for fieldbus data, particularly for protocols like Modbus lacking explicit time variables.
• This approach offers a flexible, low-cost, and hardware-compatible enhancement for industrial data acquisition systems.