Hybrid Signal I/O Module for Automated Field Device Identification
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Solution Overview
Problem
In process control systems, managing and diagnosing non-intelligent field devices is inefficient due to the lack of communication functionality, requiring manual visual confirmation and extensive labor for updating device information, especially in large-scale plants with thousands of devices.
Innovation Solution
A diagnostic method and ID module that enable electrical confirmation of field device types by using an I/O module capable of handling hybrid signals, which superimpose digital signals on analog signals, and an ID module that stores and transmits identification information through the wiring, allowing for automated device type diagnosis and database updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual visual confirmation is used to identify field device types, then device identification can be performed, but labor time and costs increase significantly
Solution Approach 1:
The field device automatically transmits its own identification information (device type, model, specifications) to the control system without requiring manual intervention. This self-service approach eliminates the need for operators to visually inspect and manually record device information, thereby reducing labor time while maintaining accurate device identification.
Solution Approach 2:
The patent replaces the manual mechanical process of visual inspection and note-taking with an automated electronic communication system. The field device uses communication circuits to electronically transmit identification data to the control system, substituting the mechanical human operation with an automated electronic information transfer process.
2Adaptability or versatility
If separate I/O circuits are provided for each field device type, then device compatibility is ensured, but system complexity and wiring time increase
Solution Approach 1:
The control system employs a universal I/O circuit design that can interface with multiple types of field devices through a single standardized interface. The system automatically detects the connected device type and configures appropriate communication parameters, eliminating the need for separate dedicated circuits for each device type while maintaining full compatibility across different device models.
Solution Approach 2:
The I/O circuit incorporates dynamic configuration capabilities that allow it to adapt its communication parameters and protocols based on the automatically detected field device type. This dynamic adjustment enables a single circuit design to serve multiple device types without requiring physical reconfiguration or manual setting changes.
3Loss of information
If manual database updates are performed when field devices are relocated, then device information accuracy is maintained, but labor requirements increase
Solution Approach 1:
The system implements automatic feedback mechanisms where the field device continuously transmits its identification information and status to the control system's database. When a device is relocated or its configuration changes, the device automatically updates its information in the database through communication circuits, ensuring data accuracy without requiring manual intervention for database maintenance.
Solution Approach 2:
The manual process of querying, locating, and updating device information in the database is replaced by an automated electronic update system. The field device directly communicates its identification data to the database through communication circuits, substituting the mechanical manual update process with an automated electronic data synchronization process.
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
This solution reduces labor and time required for wiring and device management, enables efficient device diagnosis, and ensures accurate identification of field devices, improving operational safety and efficiency in plant maintenance and construction.
Implementation Method 1
a communication unit (23) that superimposes a digital signal indicating the identification information stored in the memory (25) on an analog signal through the wiring, and transmits the superimposed signal
Data Source
AI summary
A diagnostic method of diagnosing a type of a field device, includes: setting a plurality of connection units included in an I/O module to be in a state of being capable of inputting or outputting a hybrid signal which is an analog signal having a digital signal superimposed thereon, the connection units being connected to the field device and capable of inputting the hybrid signal, outputting the hybrid signal, inputting a digital signal, and outputting a digital signal; and diagnosing the type of the field device which is connected to the connection units of the I/O module, based on the digital signal included in the hybrid signal obtained through the connection units.