Field Device Broadcast Handshake for Reliable Link Initialization
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Solution Overview
Problem
The initialization of communication links between field devices and control units in automation technology often encounters issues, leading to problems during the establishment of communication protocols.
Innovation Solution
A method where a broadcasting message with specific datums is used to determine the possibility and duration of a communication link, allowing the control unit to initialize the link only when conditions are met, and providing user-friendly feedback on initialization status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control unit attempts to initialize the communication link without checking the first datum, then the initialization process may proceed faster, but the field device will refuse the initialization causing communication failure
Solution Approach 1:
The field device performs preliminary actions by sending a broadcasting message with the first datum indicating whether communication link initialization is possible before the control unit attempts initialization. This preliminary check prevents wasted initialization attempts and ensures reliable communication establishment.
2Ease of operation
If the control unit displays the first datum to the user, then the user can understand the initialization status better, but the system complexity increases
Solution Approach 1:
The control unit provides feedback to the user by displaying the first datum from the broadcasting message. This feedback mechanism allows users to understand the initialization status and possible reasons for failure, improving ease of operation through transparent system state information.
3Reliability
If the field device determines and communicates a duration until the communication link is possible, then the control unit can initialize at the correct time, but the communication protocol complexity increases
Solution Approach 1:
The field device performs preliminary preparation by determining the duration until the communication link will be possible and includes this information in the broadcasting message. This allows the control unit to plan and execute initialization at the correct time without protocol complexity increase.
4Reliability
If the field device resends the broadcasting message after reducing the duration by a waiting time, then the duration information remains accurate, but the transmission frequency increases
Solution Approach 1:
The field device uses periodic action by resending the broadcasting message after reducing the duration by a waiting time. This periodic transmission ensures that the duration information remains accurate and up-to-date while managing energy consumption through controlled transmission intervals.
Data Source
AI summary
A method for initializing a communication link between a field device and a control unit according to a communication protocol is described. The communication protocol defines a broadcasting message with a data area. From the field device, a broadcasting message is generated and transmitted according to the communication protocol with a first datum in the data area. The first datum determines whether a communication connection is possible or not. The broadcasting message is received by the control unit and then, when the first datum determines the possibility of the communication connection, the communication connection is initialized by the control unit.