Simple Device Replacement in Class A Industrial Ethernet Networks
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Solution Overview
Problem
Industrial Ethernet networks, particularly those using Profinet IO Conformance Class A devices, face challenges in simple device replacement and managing bandwidth to prevent real-time performance drops due to the lack of cost-effective solutions for handling high-priority and low-priority traffic without complex and expensive existing IEEE 802.3 network solutions.
Innovation Solution
The method employs a ubiquitous computing paradigm combined with a token ring approach to enable simple device replacement and bandwidth management in Profinet IO networks, using peer-to-peer communication protocols and configuration tables to dynamically reconfigure the network and manage bandwidth by prioritizing access to the network using a modified token ring mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Simple Device Replacement is implemented in Profinet IO Conformance Class A networks, then device replacement becomes simpler and more cost-effective, but the patent initially states that CCA devices cannot offer SDR functionality
Solution Approach 1:
The patent enables SDR functionality in CCA devices by implementing a universal configuration exchange mechanism that works across all Profinet IO devices regardless of their original SDR capability. The solution uses standard Profinet communication protocols and configuration structures that are universally supported, allowing CCA devices to perform SDR operations without requiring specialized hardware or proprietary extensions.
Solution Approach 2:
The patent implements SDR by creating a copy of the configuration data from the old device to the new device. The configuration exchange mechanism copies device parameters, I/O mappings, and network settings from the replaced device to the replacement device, enabling the new device to immediately assume the same operational role without manual reconfiguration.
2Ease of operation
If additional hardware and specialized protocols are integrated for SDR in CCB devices, then device replacement is simplified, but device complexity and cost increase
Solution Approach 1:
The patent extracts the SDR functionality from specialized hardware and proprietary protocols, implementing it instead through standard Profinet communication mechanisms. By removing the requirement for additional hardware components and specialized protocol stacks, the solution achieves SDR capability using only the basic Profinet IO communication infrastructure already present in CCA devices.
Solution Approach 2:
The patent replaces the mechanical hardware-based SDR approach (specialized buttons, switches, or hardware modules) with a software-based communication solution using standard Profinet protocols. The device replacement process is achieved through digital configuration exchange over the existing Ethernet interface, eliminating the need for physical intervention or specialized hardware components.
3Productivity
If network bandwidth is shared between high-priority and low-priority traffic, then network utilization increases, but real-time performance may drop
Solution Approach 1:
The patent segments the network traffic into distinct priority levels using Profinet's built-in priority mechanisms. Configuration exchange traffic and normal I/O traffic are separated into different priority queues, ensuring that time-critical real-time communications receive guaranteed bandwidth while allowing non-critical traffic to utilize available capacity. This segmentation maintains real-time performance while enabling efficient network utilization.
Data Source
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AI summary
Simple device replacement (SDR), low-cost class A compatible devices that store and use configuration tables for use in performing a node replacement may be used. The use of SDR using 802.3 Ethernet-enabled class A devices allows for dispensing with an external management computer or device-mounted additional hardware (e.g., push-button, SD card, etc.), and for performing node replacement while the network remains operating. A modified token ring or logical ring configuration and process may also be utilized. In an embodiment, a logical ring with a token, which may be used as a distributed scheduler that is circulated amongst network nodes, may be provided. The use of a modified token ring may provide for managing low-priority traffic on an 802.3 network for sensors to utilize low-priority communications without impacting high-priority communications.