RFID Field Device Memory Access Without Control System Power
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Solution Overview
Problem
Current wireless transceivers in process control systems face limitations such as power constraints, slow communication speeds, and inability to function when the process plant is not operational, making it difficult for maintenance personnel to access and transmit data locally and efficiently, especially when field devices are out of service or located in hard-to-reach areas.
Innovation Solution
The implementation of radio-frequency identification (RFID) technology, including passive, semi-passive, and active RFID tags, which use electromagnetic fields or local power to transmit data to handheld readers, enabling high-speed local communications and data access without relying on control system power, thus overcoming power and access limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless transceivers are used for data communication in process control systems, then data transmission capability is provided, but power constraints limit their operation when control system power is unavailable
Solution Approach 1:
The patent introduces RFID tags as intermediary devices that store field device data independently of the control system power state. These passive RFID tags act as mediators between field devices and maintenance personnel, enabling data access without requiring the field device or control system to be powered on. The RFID reader provides temporary power to the passive RFID tag during communication, solving the power dependency issue.
Solution Approach 2:
The patent extracts the data storage function from the powered field device and places it in passive RFID tags that do not require continuous power. By separating the data storage capability from the powered control system, the system enables data access independently of control system operational state, eliminating the power constraint on data retrieval.
2Ease of operation
If traditional wired communication methods are used, then stable data access is achieved, but maintenance personnel cannot efficiently access data locally at field devices
Solution Approach 1:
The patent replaces the mechanical wired connection system with wireless RFID communication. Maintenance personnel use handheld RFID readers to wirelessly access data stored on RFID tags attached to field devices, eliminating the need for physical connection to the control system or field device. This substitution enables immediate local data access without time-consuming wired connections or remote system access procedures.
3Adaptability or versatility
If field devices are placed in hard-to-reach areas for process control, then process control functionality is maintained, but data access becomes difficult
Solution Approach 1:
The patent creates a portable copy of field device data by storing it on passive RFID tags that can be read by handheld RFID readers. This copying mechanism allows maintenance personnel to access data from field devices in hard-to-reach areas without physically accessing the field device itself. The RFID tag serves as a portable data copy that can be read from a distance, maintaining data accessibility regardless of field device location.
4Speed
If high-speed data transmission is implemented, then communication efficiency improves, but power consumption increases
Solution Approach 1:
The patent implements periodic, brief communication bursts between the RFID reader and passive RFID tag rather than continuous high-speed transmission. The RFID reader activates the passive RFID tag only when data transfer is needed, maintaining high transmission speed during the brief communication window while minimizing overall power consumption. This periodic action allows fast data exchange when needed without sustained power consumption.
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
RFID technology allows for reliable, high-speed data transmission and access to maintenance and configuration information locally, even when field devices are not powered or out of service, improving maintenance efficiency and reducing production downtime by providing complete and up-to-date information without depending on remote data retrieval.
Implementation Method 1
radio-frequency identification tag to be operatively coupled to the non-volatile memory. The non-volatile memory is to store data received from at least one of the field device or a radio-frequency identification writer via the radio-frequency identification tag. The radio-frequency identification tag is to wirelessly transmit the data to a radio-frequency identification reader.
Data Source
AI summary
Methods and apparatus for RFID communications in a process control system are disclosed. An example apparatus includes a non-volatile memory to be operatively coupled to a field device of a process control system; and a radio-frequency identification tag to be operatively coupled to the non-volatile memory. The non-volatile memory is to store data received from at least one of the field device or a radio-frequency identification writer via the radio-frequency identification tag. The radio-frequency identification tag is to wirelessly transmit the data to a radio-frequency identification reader. The data includes at least one of maintenance information, diagnostic information, or configuration information associated with the field device. The non-volatile memory and the radio-frequency identification tag to be physically coupled to the field device.