PLC Trigger Relay for Selective Multi-Logger Signal Sharing
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Solution Overview
Problem
Existing systems face issues with inappropriate logging when multiple devices share a trigger, leading to unnecessary transmission of trigger signals and inefficient data analysis in factory automation environments.
Innovation Solution
A trigger relay unit in a programmable controller that connects to multiple detectors, receiving and transmitting trigger signals while excluding secondary trigger signals during transmission, ensuring appropriate logging across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share a trigger to perform logging, then logging coverage is improved, but unnecessary trigger signal transmission occurs causing inappropriate logging
Solution Approach 1:
The system performs preliminary actions by having the first detector transmit the trigger signal to the trigger relay unit before the second detector independently detects the same trigger. The trigger relay unit then transmits the trigger signal to the second detector, ensuring that the second detector logs only when the first detector has already initiated the logging process, thereby preventing duplicate or inappropriate logging
Solution Approach 2:
The trigger relay unit acts as an intermediary between the first detector and the second detector. It receives the trigger signal from the first detector, processes it by excluding signals within the logging period, and selectively transmits it to the second detector. This intermediary mechanism ensures that the second detector receives trigger signals only when appropriate, preventing inappropriate logging while maintaining logging coverage
2Stability of the object's composition
If trigger signals are transmitted to all detectors, then logging consistency is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The trigger relay unit extracts and excludes trigger signals that should not be transmitted to the second detector. Specifically, it excludes trigger signals received during the logging period initiated by the first detector. This selective extraction maintains logging consistency for valid triggers while removing unnecessary transmissions, thereby improving data transmission efficiency
Solution Approach 2:
The trigger relay unit performs preliminary filtering of trigger signals before transmitting them to the second detector. By excluding signals within the logging period in advance, it prevents unnecessary data transmission while ensuring that only appropriate trigger signals are transmitted, thus maintaining logging consistency without sacrificing transmission efficiency
Data Source
AI summary
A central processing unit in a programmable controller is connectable to a plurality of logging devices to detect a trigger to log control data about device control. The central processing unit includes a bus communicator that receives a first trigger signal indicating the trigger from a first logging device of the plurality of logging devices, and a trigger relay that transmits the first trigger signal to a second logging device different from the first logging device when the first trigger signal is received. The trigger relay excludes, from a transmission target, a second trigger signal different from the first trigger signal and received in a period from when the first trigger signal is received to when the trigger relay completes transmitting the first trigger signal.