Modular Field Radio Access with Hardware-Gated Write Channel

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Solution Overview

Problem

Existing field devices face challenges in secure and efficient retrofitting of radio modules due to limited power supply via the 4 mA to 20 mA current loop, leading to installation complexity and increased risk of unauthorized operation or manipulation.

Innovation Solution

A field device with a modular structure featuring a radio module that includes two channels - a first for reading access and a second for writing access, where the second channel is deactivated by default and activated through a hardware-based switching element, ensuring secure and controlled access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a radio module is integrated into a field device with power supply via the 4 mA to 20 mA current loop, then wireless communication capability is added, but the limited power available via the current loop is insufficient to simultaneously supply the radio module, electronics module, and sensor

Engineering Contradiction:

Improvewireless communication capabilityVSAvoidpower availability

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent segments the power supply architecture by introducing a separate power supply unit that can independently power the radio module. This segmentation allows the radio module to receive sufficient power without compromising the power available to the sensor and electronics module through the 4 mA to 20 mA current loop.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The separate power supply unit serves multiple functions: it powers the radio module, provides backup power for the field device, and can enable extended operational modes. This multi-functionality resolves the power insufficiency issue while maintaining versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If external operating units are physically connected to the 4 mA to 20 mA current loop for communication, then field device operation is enabled, but the two-wire line must be modified (stripped and cut) which increases installation effort and complexity

Engineering Contradiction:

Improvefield device operabilityVSAvoidinstallation complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical connection approach (physical wiring of external operating units to the current loop) with a wireless communication system. The radio module enables wireless communication between the field device and operating units, eliminating the need to modify the two-wire line and reducing installation complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If the second radio channel for writing access is permanently activated, then remote parameterization and software updates are enabled, but the field device becomes vulnerable to unauthorized operation and deliberate manipulation

Engineering Contradiction:

Improveremote parameterization capabilityVSAvoidsecurity against manipulation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent makes the second radio channel dynamic rather than static. It can be activated or deactivated based on operational needs, allowing the system to balance between remote parameterization capability and security against unauthorized manipulation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies different access qualities to different radio channels: the first channel (reading access) remains permanently activated for monitoring, while the second channel (writing access) is activated only when needed. This local differentiation of access rights maintains security while enabling remote parameterization when required.

Inventive Principle:

Principle #3Local quality

4Adaptability or versatility

If radio modules are retrofitted into field devices, then wireless communication is added, but the retrofitting process is laborious and increases installation effort

Engineering Contradiction:

Improvewireless communication capabilityVSAvoidretrofitting effort

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent segments the radio module as a separate, modular component that can be independently installed or removed. This segmentation simplifies the retrofitting process, allowing the radio module to be added without modifying the core field device architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a separate power supply unit as an intermediary component that facilitates the integration of the radio module. This intermediary approach simplifies the retrofitting process by providing a standardized interface for power and data connections.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12572121B2Field device and modular field device system

Publication Date: 2026.03.10 VEGA GRIESHABER GMBH & CO

AI summary

An automation technology field device, including a radio module, wherein the radio module is configured such that it forms at least one first radio channel and one second radio channel, wherein the first radio channel is configured for a reading access and the second radio channel for a writing access to the field device, characterized in that the second radio channel is deactivated in a basic state of the field device and the field device has a switching element at least partially realized as hardware, wherein the switching element is configured such that the second radio channel can be activated.