Contactless Field Device Parameterization via Modulated Magnetic Switching
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Solution Overview
Problem
Existing field devices in process automation require costly and often infeasible separate interfaces for parameterization after assembly, due to their completely closed metallic housing, which hinders cost-effective communication and calibration.
Innovation Solution
Implementing a contactless communication interface using a switching element, such as a reed switch or Hall sensor, that can be actuated externally to transmit data, allowing for hermetically sealed housing while enabling parameterization and diagnostic data exchange without physical contact, using a modulable magnetic or optical interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a completely closed metallic housing is used for the field device, then hermetic sealing and protection are improved, but contactless communication interface implementation becomes difficult and costly
Solution Approach 1:
The switching element serves multiple functions: it acts as both a calibration activation switch and a communication interface for data transmission. This multi-functionality eliminates the need for separate communication interfaces, reducing device complexity while maintaining hermetic sealing.
Solution Approach 2:
A switching element (reed switch or Hall sensor) is introduced as an intermediary component that enables external actuation and data transmission through the hermetic housing without compromising the sealing. The switching element responds to magnetic fields from external actuators, providing a bridge between the external environment and the sealed interior.
2Adaptability or versatility
If a separate interface is added for parameterization after assembly, then communication capability is improved, but device complexity and cost increase
Solution Approach 1:
The switching element is designed to serve dual purposes: triggering calibration functions and enabling data transmission for parameterization. By using the same component for both activation and communication, the patent avoids adding separate interfaces while maintaining full parameterization capability.
Solution Approach 2:
The patent combines the calibration activation function and the communication interface function into a single switching element. This merging of functions reduces the number of components needed and simplifies the overall device structure while maintaining adaptability for parameterization.
3Ease of manufacture
If existing components are used for communication, then cost is reduced, but communication functionality must be multi-purpose
Solution Approach 1:
The switching element is designed to perform multiple communication-related functions: receiving actuation signals for calibration, transmitting data bidirectionally, and enabling various parameterization operations. This multi-functionality is achieved through the element's ability to respond to magnetic field modulation and provide detectable switching states.
Solution Approach 2:
The switching element leverages its inherent magnetic field sensitivity to provide both activation and communication functions without requiring additional specialized components. The element uses the same physical property (magnetic field response) for both triggering calibration and enabling data transmission, making the system cost-effective while maintaining versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables cost-effective communication and calibration of field devices by utilizing existing components for data transmission, allowing for parameterization and diagnostic functions without dismantling, and supports predictive maintenance by securely transmitting data via agreed protocols.
Implementation Method 1
the operating device generates a magnetic field that can be modulated
Implementation Method 2
The switching element is an analog or digital magnetic field-sensitive component, preferably an analog or digital Hall sensor
Implementation Method 3
The switching element is an analog or digital magnetic field-sensitive component, preferably an analog or digital Hall sensor or a reed switch
Data Source
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AI summary
The invention relates to a system comprising an operating device (1) and a field device (2). The field device has at least one sensor unit (21) for determining and/or monitoring at least one process variable, at least one electronics unit (22), which has an evaluating unit, which receives measurement signals from the sensor unit (21) and evaluates said measurement signals with regard to the process variable, and at least one switching element (23) that can be actuated in a contactless manner from outside the field device. The invention is characterized in that the operating device (1) is designed to modulate the switching state of the switching element (23) in order to transmit field-device-specific data to the electronics unit (22). The invention further relates to a field device, to an operating device, and to a method for communicating between a field device and an operating device.