Mobile Operating Device Management via Selective Emergency Stop
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Solution Overview
Problem
Existing methods for managing mobile operating devices in safety-relevant fields face challenges in maintaining high availability during communication errors, as temporary interruptions can lead to unwanted emergency stops, resulting in costly downtime or material damage.
Innovation Solution
A method where status information is stored in a controller for each operating device, allowing for controlled emergency stop responses based on the device's status and logon/logoff conditions within defined active areas, using RFID transponders for spatial definition and wireless communication links to manage machine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless transmission technology is used to operate machines from mobile devices, then ease of operation is improved, but reliability deteriorates due to communication errors causing unwanted emergency stops
Solution Approach 1:
The system applies different response behaviors to different machines based on their specific status and location. When a communication error occurs, the controller selectively deactivates only the machine associated with the mobile operating device, while other machines continue operating normally. This localized response maintains high availability by preventing unnecessary shutdowns of unaffected machines.
Solution Approach 2:
The system changes the operational parameter of machines based on communication status. When communication errors are detected, the controller monitors the status information and logon/logoff conditions, then adjusts the machine state from active to deactivated only for affected machines, rather than applying a uniform shutdown to all machines.
2Object-affected harmful factors
If emergency stop function is activated upon communication interruption, then safety is improved, but productivity deteriorates due to machine downtime and material damage
Solution Approach 1:
The system segments the plant into multiple independent machine units, each with its own status information. When a communication error occurs, the emergency stop function is applied selectively to only the affected machine rather than shutting down the entire plant. This segmentation allows unaffected machines to continue operating, maintaining productivity while still ensuring safety for the specific affected unit.
Solution Approach 2:
Instead of applying a full emergency stop to all machines upon communication interruption, the system applies a partial action by deactivating only the specific machine associated with the mobile operating device. This partial deactivation maintains safety for the affected unit while avoiding excessive shutdown of other machines, thereby preserving overall productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures high availability of machines by selectively deactivating only affected machines during communication errors, minimizing downtime and preventing unnecessary shutdowns, thus maintaining operational efficiency.
Implementation Method 1
The active areas are restricted by one or several RFID transponders
Implementation Method 2
wireless transmission technology
Data Source
AI summary
There is described a method for managing mobile operating devices, which are used to operate a machine within an assigned active area. Emergency stop outlets are triggered as a function of status information of an operating device and of the logon in an active area.