Field Device RF Circuitry Powered by Two-Wire Loop
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Solution Overview
Problem
Industrial process control systems face limitations in monitoring and controlling field devices due to the need for direct visual access and the inability to display information from multiple devices simultaneously or in convenient locations, especially with traditional wired connections.
Innovation Solution
Incorporating RF circuitry in field devices that can be powered by a two-wire process control loop, enabling wireless communication and allowing for the transmission and reception of RF signals, which can be used to display information from multiple field devices on a local or portable display, eliminating the need for direct visual access and enabling simultaneous monitoring of multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If field devices are connected to the control room by two-wire process control loops, then the devices can be powered and communicate data, but direct visual access is required and multiple devices cannot be monitored simultaneously from convenient locations
Solution Approach 1:
The patent combines the power delivery function and wireless communication function into a single two-wire process control loop system. The loop provides both electrical power to the field device and carries data signals, while the RF circuitry enables wireless transmission of the same data, merging multiple functions into one integrated solution that eliminates the need for separate power and communication infrastructure.
Solution Approach 2:
The patent introduces RF circuitry as an intermediary component that receives data from the two-wire process control loop and transmits it wirelessly to portable or local displays. This intermediary enables the bridge between the wired control system and wireless monitoring devices, allowing operators to access field device data from convenient locations without requiring direct visual access to the devices themselves.
2Ease of operation
If wireless communication is implemented in field devices, then operators can access data without physical proximity, but additional power requirements may arise
Solution Approach 1:
The two-wire process control loop is designed to serve multiple functions simultaneously: it provides electrical power to the field device, carries digital data signals for communication, and powers the RF circuitry for wireless transmission. This multi-functional approach eliminates the need for separate power sources for wireless communication, as the existing loop infrastructure handles all power and data requirements.
Solution Approach 2:
The field device is designed to draw all necessary power for its operations, including the RF wireless communication circuitry, directly from the two-wire process control loop. The system is self-sufficient, requiring no external power sources or battery replacements, as the control loop independently provides all electrical energy needed for sensing, processing, and wireless transmission functions.
3Productivity
If operators must have direct visual access to field devices for monitoring, then system simplicity is maintained, but operational efficiency and safety are reduced in hazardous locations
Solution Approach 1:
The patent replaces the mechanical requirement of direct visual access and physical proximity with wireless electromagnetic communication. Instead of operators needing to be physically present at field device locations to view data on local displays, the system uses RF transmission to send data wirelessly to portable devices that operators can access from safe, convenient locations, eliminating the need for physical exposure to hazardous environments.
Data Source
AI summary
A field device for use in an industrial process control or monitoring system includes terminals configured to connect to a two-wire process control loop. The loop carries data and provides power to the field device. RF circuitry in the field device is provided for radio frequency communication. A power supply powers the RF circuitry using power received from the two-wire process control loop.