Relay Feedback for Distributed Control Path State Changes
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Solution Overview
Problem
In network distributed control systems, the control performance fluctuates due to changes in communication states of transmission paths, necessitating a configuration that can quickly respond to these changes.
Innovation Solution
A control system with a relay unit that detects the communication state of one transmission path and transmits this state to a second controller via cyclic and message communication, allowing the second controller to take appropriate actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data exchange between controllers is achieved via the relay unit and transmission path, then the network distributed control system can be configured, but the control performance fluctuates in response to changes in communication state
Solution Approach 1:
The relay unit detects the communication state of the transmission path and feeds back this information to the second controller. This feedback mechanism enables the second controller to adjust its operations based on the actual communication state, thereby maintaining stable control performance despite fluctuations in transmission path conditions.
Solution Approach 2:
The system proactively detects communication state changes before they significantly impact control operations. By monitoring the transmission path state in advance and notifying the second controller, the system can take preliminary actions to maintain stable operating rates and prevent performance degradation.
2Reliability
If the relay unit transmits communication state data to the second controller, then the second controller can take action against communication state changes, but additional data transmission is required
Solution Approach 1:
The communication state data is merged with the regular data transmission between controllers. The relay unit transmits both control data and communication state information through the existing communication infrastructure, eliminating the need for separate monitoring channels and reducing overall system complexity.
Solution Approach 2:
The transmission path serves multiple functions: it carries both control data between controllers and communication state information from the relay unit. This multi-functionality reduces the need for dedicated monitoring channels and simplifies the communication protocol structure.
3Reliability
If cyclic communication is used to transmit communication state data, then the state can be notified continuously, but the communication load increases
Solution Approach 1:
The relay unit transmits communication state data at regular periodic intervals through cyclic communication. This periodic transmission ensures continuous notification of the second controller about transmission path conditions while maintaining a predictable and manageable communication load that can be efficiently handled by the system.
Data Source
AI summary
A control system includes a first controller including an interface for connection to a first transmission path, a second controller including an interface for connection to a second transmission path, and a relay. The relay includes a first interface for connection to the first transmission path, and a second interface for connection to the second transmission path. The relay detects a communication state of the first transmission path, and, in accordance with a transfer setting, transmit, to the second controller output data transmitted from the first controller, and transmit, to the second controller, first state data indicating the detected communication state of the first transmission path.