Wireless Field Device Diagnostics for Industrial Process Control
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Solution Overview
Problem
Wireless field devices in industrial process control systems are susceptible to degradation and failure due to their components, leading to errors in measurements and potential complete system failure, especially when using self-contained power sources like solar panels and batteries, which can introduce reliability issues.
Innovation Solution
Incorporating diagnostic circuitry within wireless field devices to monitor and diagnose the operation of process variable transmitters, including power supply components, to detect potential failures, report causes, and compensate for them, using wireless communication links to transmit diagnostic information for remote analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless field devices use self-contained power sources (batteries, solar panels), then wiring complexity is reduced and installation is simplified, but reliability deteriorates due to component degradation and failure
Solution Approach 1:
The diagnostic circuitry performs preliminary detection of potential failures in power sources and communication components before they cause complete device failure. By continuously monitoring battery voltage, solar panel output, and wireless communication status, the system can identify degradation trends and alert operators in advance, allowing preventive maintenance actions to be taken before reliability-critical failures occur.
Solution Approach 2:
The system implements feedback through diagnostic circuitry that continuously monitors the health status of power sources and communication components, then reports this information wirelessly to the control system. This feedback loop enables real-time assessment of device reliability and allows for dynamic maintenance scheduling based on actual component condition rather than fixed time intervals.
2Reliability
If diagnostic circuitry is added to wireless field devices, then reliability is improved through failure detection, but device complexity increases
Solution Approach 1:
The diagnostic circuitry is designed to serve multiple functions: monitoring battery voltage, assessing solar panel performance, detecting wireless communication status, and identifying sensor failures. By consolidating these diagnostic capabilities into a single multi-functional module, the patent reduces the overall complexity that would result from separate dedicated circuits for each diagnostic function.
Solution Approach 2:
The wireless field device performs self-diagnosis through integrated circuitry that automatically monitors its own components without requiring external testing equipment. The diagnostic system uses the device's existing wireless communication capabilities to report its own health status, eliminating the need for separate testing infrastructure and reducing overall system complexity.
3Reliability
If continuous monitoring is implemented, then reliability is improved through early failure detection, but energy consumption increases
Solution Approach 1:
The diagnostic circuitry performs monitoring at periodic intervals rather than continuously, assessing battery voltage, solar panel output, and communication status at scheduled times. This periodic approach maintains adequate detection capability while significantly reducing power consumption compared to continuous monitoring, extending battery life in wireless devices.
Solution Approach 2:
The system implements partial monitoring by focusing diagnostic efforts on the most critical components (power sources and communication circuitry) that have the greatest impact on overall device reliability. Rather than continuously monitoring all components equally, the system applies enhanced monitoring only where most needed, optimizing the balance between detection capability and energy consumption.
Data Source
AI summary
A wireless process device for use in an industrial process control or monitoring system comprising includes a power source configured to power the process device. Diagnostic circuitry is configured to diagnose operation of process device and provides a diagnostic output. Wireless communication circuitry transmits information over a wireless communication link.