I/O Channel Current Signature Detection for Device Type Identification
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Solution Overview
Problem
Existing industrial process control systems face challenges in identifying connected device types on I/O channels at runtime, which can lead to hazardous situations due to incorrect device configuration, especially with smart devices that require precise communication protocols like HART, where incorrect energization can affect output devices.
Innovation Solution
A method involving applying a current for a predefined duration to an I/O channel, initiating regular current readbacks, determining and storing current values, and identifying device types based on patterns of current sink characteristics, including waveforms of current drop and release, to differentiate between Analog Input, Analog Output, Digital Input, Digital Output, and smart devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual identification of device types on I/O channels is performed, then configuration accuracy can be ensured, but time consumption and labor effort increase significantly
Solution Approach 1:
The system enables automatic device type identification by having the I/O module itself perform current measurements and pattern recognition on connected devices. The module autonomously applies test currents, reads back current values, determines patterns, and identifies device types without requiring manual intervention or physical presence at device locations.
Solution Approach 2:
The patent replaces manual mechanical identification processes with electrical measurement-based automatic identification. Instead of physically inspecting or manually configuring devices, the system uses current characteristic measurements and pattern analysis to automatically determine device types, substituting human effort with automated electrical sensing and processing.
2Loss of information
If current is applied to energize HART devices for identification, then device type detection becomes possible, but adverse effects may occur on output devices connected to the same channel
Solution Approach 1:
The system applies current in a controlled, partial manner by limiting the duration and magnitude of test currents to minimum necessary levels. Current is applied only for short measurement intervals rather than continuous energization, and only at levels sufficient to detect device characteristics without causing harmful effects on connected output devices.
Solution Approach 2:
The I/O module performs preliminary current measurements and pattern analysis before final device configuration. By measuring current characteristics during initial connection verification, the system identifies device types and determines appropriate configuration parameters in advance, preventing incorrect configuration that could lead to harmful effects during normal operation.
3Ease of operation
If remote device identification is implemented, then manual identification effort is reduced, but measurement precision may be affected by distance and interference
Solution Approach 1:
The I/O module acts as an intermediary between the control system and field devices. It performs all current measurements and pattern recognition operations locally at the module level, using the existing I/O channel as the measurement path. This eliminates the need for direct physical access to devices while maintaining measurement precision by conducting measurements through the controlled environment of the I/O module rather than over long distances.
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 remote identification of device types on I/O channels without physical presence, reducing manual effort and preventing adverse effects from incorrect energization, thereby ensuring safe and accurate configuration of industrial process control systems.
Implementation Method 1
applying a current for a predefined time duration to at least one I/O channel associated with an I/O module; initiating a current readback at a regular interval of time within the predefined time duration; determining values of the current readback
Data Source
AI summary
A method, system and apparatus for identifying a type of device connected to I/O (Input/Output) channels of an I/O module, can involve applying a current for a predefined time duration to one or more I/O channels of an I/O module, initiating a current readback at a regular interval of time within the predefined time duration, determining values of the current readback for each of a time interval during the predefined time duration, storing the values of the current readback in a memory associated with the I/O module, determining a pattern as a function of the values of the current readback and a sample of time interval for a device connected to the one or more I/O channels, and identifying a type of the device connected to the one or more I/O channels based on a determined pattern of a current sink of the device connected to the one or more I/O channels.