Field Device Radio Module Mechanical Activation Control
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Solution Overview
Problem
Existing field devices face challenges with energy sufficiency and security risks due to reliance on the 4 mA to 20 mA current loop for power and communication, particularly when integrating radio modules, which can lead to unintentional or malicious operation and increased installation and safety efforts.
Innovation Solution
A field device with a modular design featuring a radio module that can be connected and disconnected, with a mechanical activation/deactivation control element accessible only when the radio module is removed, ensuring secure operation and reduced energy consumption, and optionally incorporating a battery for independent power supply and time-controlled activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radio module is integrated into the field device, then wireless communication capability is improved, but energy consumption increases and may exceed the power available from the 4 mA to 20 mA current loop
Solution Approach 1:
The radio module's operational state is dynamically controlled through a control element that can switch between active and inactive states. The module is only activated when explicitly commanded, allowing the system to adapt its energy consumption based on actual communication needs rather than operating continuously
Solution Approach 2:
The field device itself provides the control mechanism for the radio module through an integrated control element, eliminating the need for external control units. This self-contained approach allows the device to autonomously manage its own wireless communication functionality and energy consumption
2Ease of operation
If the radio module is always active, then communication availability is improved, but security risks increase due to potential unauthorized operation
Solution Approach 1:
The control element is mechanically positioned to prevent unauthorized activation before it can occur. By requiring physical access and deliberate action to activate the radio module, the system preemptively blocks potential security threats rather than relying on detection and response mechanisms
Solution Approach 2:
The radio module transitions between inactive and active states based on explicit control commands. This dynamic control ensures the module remains secure by default (inactive) and only becomes operational when intentionally activated through the controlled interface, balancing security with communication availability
3Ease of operation
If the control element is always accessible, then ease of operation is improved, but security risks increase due to accidental or intentional manipulation
Solution Approach 1:
The control element is positioned in a specific location on the radio module that is not continuously accessible. This localized positioning creates a physical barrier that protects the control function while still allowing operation when needed, differentiating between normal access requirements and security protection needs
4Adaptability or versatility
If external control units are used to operate the field device, then communication flexibility is improved, but installation complexity increases due to cable modification requirements
Solution Approach 1:
The control functionality previously requiring external units is merged directly into the field device through the integrated control element. This consolidation eliminates the need for separate external control devices and their associated cable modifications, while maintaining the ability to control the radio module and sensor functions
Data Source
Figure 1
AI summary
The present invention relates to a field device (1) comprising a housing (3), a sensor (5) and an electronics unit (6) arranged in the housing (3), wherein the field device is provided with a radio module (9) that can be connected to and detached from the electronics unit (6) and with an operating element (11) for activating and deactivating the radio module (9). The operating element (11) is mechanically arranged such that the operating element (11) can only be actuated when the housing is open and the radio module has been detached, which deactivates the field device.