Touch Input Display Rotating Operation Control
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Solution Overview
Problem
Existing control systems for machinery and equipment, such as those using Programmable Logic Controllers (PLCs) and Human Machine Interfaces (HMIs), face issues with accidental touch inputs leading to incorrect instructions due to the risk of unintended contact with touch panels.
Innovation Solution
A control device and program that require a user to perform a rotating operation with two points on the touch screen by a predetermined angle to update status values, ensuring intentional input and preventing accidental changes to the control system's status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch panel is added to the HMI device to improve operability, then ease of operation is improved, but reliability deteriorates due to risk of accidental contact
Solution Approach 1:
The system performs preliminary verification by detecting the relationship between multiple touch points before executing the input operation. It calculates the distance between touch points and compares it against a predetermined threshold, ensuring that only intentional multi-point touches are recognized. This preliminary check prevents accidental single-point touches from triggering operations, thus resolving the contradiction between ease of operation and reliability.
2Reliability
If multi-point touch detection is implemented to prevent accidental input, then reliability is improved, but device complexity increases
Solution Approach 1:
The system changes the detection parameter from simple single-point touch to multi-point touch with distance verification. By introducing a distance threshold parameter (comparing the distance between touch points against a predetermined value), the system achieves more reliable input detection. This parameter-based approach maintains relatively simple control logic while significantly improving reliability, as it only requires calculating distance between points and comparing against a threshold.
Data Source
AI summary
The present invention provides a new configuration for enabling an input only in the case where a user performs touch operation with the intention of performing the operation. A control device includes a control unit configured to monitor and control at least a target device and an input display unit configured to display a monitoring/controlling screen associated with the target device and also to detect touch operation performed by a user. When the input display unit detects that the user continues touching the monitoring/controlling screen at least at two points and performs rotating operation by a predetermined angle or more, the control unit changes a status value associated with touched positions of the at least two points.