Multimode RF Sensor Tags for Unpowered Field Device Data Access
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Solution Overview
Problem
Current wireless transceivers in process control systems face limitations such as reliance on control system power, leading to high operating costs, limited communication speed, and inability to function when field devices are unpowered or during plant shutdowns, hindering maintenance and data access.
Innovation Solution
The implementation of multimode radio frequency sensor tags (RFSTs) that utilize different frequency bands (HF, UHF, LF, and SHF) for communication, allowing data retrieval and storage even when field devices are unpowered, using energy harvesting and passive/semi-passive modes to enable efficient and high-speed data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless transceivers rely on control system power, then communication can be maintained when devices are powered, but operating costs increase and communication fails when field devices are unpowered or during plant shutdowns
Solution Approach 1:
The system segments communication functionality into two distinct modes: powered mode using traditional transceivers and unpowered mode using RFSTs with energy harvesting. This allows the system to select the appropriate communication method based on power availability, maintaining reliability while optimizing energy consumption.
Solution Approach 2:
The RFST incorporates energy harvesting capabilities that allow it to self-power without relying on control system power. The RFST harvests energy from the RF signals themselves and environmental sources, enabling autonomous operation during plant shutdowns and unpowered conditions.
2Productivity
If traditional wireless transceivers are used, then communication infrastructure is simple, but communication speed is limited and data accessibility is reduced during unpowered conditions
Solution Approach 1:
The system implements a universal communication framework that supports multiple frequency bands (HF, UHF, LF, SHF) and multiple operational modes (powered, unpowered, energy harvesting) within a single RFST device. This multi-functionality enables high-speed communication when needed while maintaining operational simplicity through standardized interfaces.
Solution Approach 2:
The RFST dynamically adapts its operational mode and frequency band based on power availability and communication requirements. The system can switch between passive and active modes, and between different frequency bands, optimizing communication speed while managing power consumption and infrastructure complexity.
3Adaptability or versatility
If single frequency band RFSTs are used, then device design is simple, but communication versatility and adaptability to different conditions are limited
Solution Approach 1:
The RFST merges multiple frequency band capabilities (HF, UHF, LF, SHF) and multiple operational modes (powered, unpowered, energy harvesting) into a single integrated device. This consolidation provides communication versatility across different conditions while managing device complexity through integrated design.
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 reliable, high-speed local communications with field devices, reducing maintenance costs and improving data accessibility without relying on control system power, allowing data access during plant shutdowns and remote operations.
Implementation Method 1
The example first sensor tag includes a first antenna arranged to communicate with the first sensor tag when the first sensor tag receives operational data, the first antenna to communicate with the first sensor tag via a first frequency band
Implementation Method 2
The example apparatus also includes and a first antenna coupled to the first sensor tag and a second antenna coupled to the second sensor tag, the first antenna and the second antenna to provide operational data from the first memory and second memory to a handheld device
Data Source
AI summary
An example apparatus includes a first sensor tag to retrieve operational data, via a modem and a data bus, from a process control field device, wherein the first sensor tag includes a memory to store the operational data; a first antenna arranged to communicate with the first sensor tag when the first sensor tag receives operational data, the first antenna to communicate with the first sensor tag via a first frequency band; and a first identification device to retrieve the operational data from the first sensor tag, via the first antenna and the first frequency band, while the process control field device is unpowered.