Field Device Communication Role Inversion for Resource-Aware Messaging
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Solution Overview
Problem
In existing systems, field devices often face resource constraints and security risks due to inadequate processing time for messages, unsolicited message transmission, and unknown message timing, particularly when implementing a slave role, which can lead to resource undersupply and security vulnerabilities.
Innovation Solution
Reversing the master and slave roles within the system, where the field device control device implements the master role and the control device control device implements the slave role, allowing the field device to manage message transmission based on available resources and energy, ensuring secure and timely communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control device transmits messages to the field device in a master-slave configuration, then the control device can initiate communication, but the field device cannot transmit messages without being requested, causing resource underutilization and security risks
Solution Approach 1:
The patent inverts the traditional master-slave role assignment in the communication protocol. Instead of the control device being the master and field device the slave, the field device becomes the master and control device becomes the slave. This allows the field device to initiate message transmissions when resources are sufficient, rather than waiting to be requested, thereby resolving the contradiction between ease of operation and resource reliability.
2Speed
If the field device processes messages within a short time frame defined in the communication protocol, then message transmission speed is maintained, but resources available for processing are insufficient
Solution Approach 1:
The patent introduces dynamic resource management where the field device monitors its resource availability and adaptively controls message transmission timing. When resources are sufficient, the field device transmits messages proactively; when resources are constrained, it delays transmission. This dynamic approach resolves the contradiction between maintaining fast message processing speed and ensuring sufficient resource availability for processing.
3Loss of information
If the control device transmits multiple messages to the field device, then information exchange is enhanced, but the field device cannot process all messages within the available time frame
Solution Approach 1:
The patent implements periodic message transmission where the field device sends messages at regular intervals when resources are sufficient, rather than processing all incoming messages immediately. This periodic approach allows the system to maintain complete information exchange over time while avoiding overwhelming the field device with too many simultaneous processing tasks, thus resolving the contradiction between information completeness and processing time.
4Reliability
If the field device ignores unsolicited messages, then security risks from unauthorized transmission are reduced, but legitimate communication from other devices may be blocked
Solution Approach 1:
The patent implements a feedback-based communication system where the field device, as master, selectively acknowledges and processes messages from control devices. The field device can identify and respond to legitimate communication attempts while ignoring unsolicited messages, maintaining security without completely blocking flexible communication. The feedback mechanism allows the system to adapt to different communication scenarios while preserving security.
Data Source
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AI summary
A system (1) comprising a field device (2) and a control unit (3) is shown and described, wherein the field device (2) has a field device control device (4) and a field device transmission device (5), wherein the control unit (3) has a control unit control device (12) and a control unit transmission device (13), wherein the field device transmission device (5) and the control unit transmission device (13) have a transmission path (15) between them, wherein the field device control device (4) and the control unit control device (12) are configured for bidirectional transmission of messages between them according to a communication protocol via the field device transmission device (5), the transmission path (15) and the control unit transmission device (13), and wherein the communication protocol implements the transmission of messages with a master role and a slave role.The invention is based on the objective of solving the problem that the field device (2) must process a message transmitted from the control unit (3) to the field device (2) within a time frame defined in the communication protocol. This objective is achieved by the field device control device (4) assuming the master role and the control unit control device (12) assuming the slave role.