IO-Link Relay Power Isolation for Safe Device Replacement
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Solution Overview
Problem
Conventional factory automation (FA) systems face inefficiencies when replacing devices, as stopping power supply to one device stops all connected devices, and using protocols like IO-Link increases this issue, particularly with output devices that may operate immediately upon power resumption, posing safety risks.
Innovation Solution
A relay device with a designation receiving unit, power supply state switching units, and a power supply control unit that allows selective power shutdown of designated devices while maintaining power to others, enabling safe device replacement without interrupting other devices' operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply is stopped to replace one device, then safety is improved, but power supply to all connected devices is stopped causing operational disruption
Solution Approach 1:
The patent divides the power supply control into separate controllable units for each connected device. Instead of controlling power supply as a single unified system, the relay device provides individual power supply control paths to each device, allowing selective power interruption to only the target device while maintaining power to other devices. This segmentation enables safe device replacement without stopping other operations.
2Productivity
If power supply is maintained to enable continuous operation, then productivity is improved, but device replacement becomes dangerous due to immediate operation upon power resumption
Solution Approach 1:
The patent implements preliminary action by providing a power supply stop function that can be activated before device replacement. The control device sends a power supply stop instruction to the relay device, which then stops power supply to the target device in advance of the replacement operation. This preliminary power interruption ensures the device cannot operate immediately upon replacement, preventing dangerous situations while allowing other devices to continue operating.
3Reliability
If selective power control is implemented, then device replacement safety is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent uses the relay device as an intermediary between the control device and connected devices. The relay device receives power supply control instructions from the control device and executes selective power supply interruption. This intermediary approach allows complex selective power control functionality to be implemented without requiring the control device to directly manage each device's power supply, thereby managing system complexity through a dedicated intermediate controller.
Data Source
AI summary
The purpose of the present invention is to stop the power supply to a specified device among a plurality of devices to be supplied with power, and maintain the power supply to the other device. An IO-Link master is provided with: an upper-level communication control unit which receives a specification of a device to which the power supply is to be stopped; and a power supply control unit which controls a device power supply switching unit corresponding to the device to which the power supply is to be stopped, to stop the power supply to said device while maintaining the power supply to the other device.