Point-to-Point Backplane Bypass for RIUP Module Swaps
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Solution Overview
Problem
Conventional point-to-point backplane arrangements in industrial control systems disrupt data communications when removing or inserting I/O modules, leading to interruptions and inefficiencies, particularly due to the lack of RIUP (Removal and Insertion Under Power) functionality.
Innovation Solution
The implementation of a passive bypass data switch and a specific timing sequence for module insertion and removal, utilizing make-before-break mounting base pins and varying PCB edge pad lengths to maintain continuous data communication through a normally closed bypass switch, allowing modules to be inserted or removed without interrupting data flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional point-to-point backplane arrangement is used, then data communication speed is improved, but data communication continuity is disrupted when removing or inserting modules
Solution Approach 1:
The bypass switch is pre-configured in a closed position during normal operation, ready to activate immediately when a module is removed. This preliminary preparation ensures that the alternative communication path is available without delay, maintaining data communication continuity while preserving the high-speed point-to-point architecture
Solution Approach 2:
The bypass switch acts as an intermediary element that provides an alternative communication path between adjacent modules. When the primary module is removed, the bypass switch mediates the data flow, routing communications through the alternative path to maintain system operability and continuity
2Device complexity
If a passive bypass data switch arrangement is used, then device complexity is reduced, but active module control of the bypass switch is lost
Solution Approach 1:
The system utilizes the mechanical insertion and removal actions of the module itself to trigger the bypass switch state changes. The module's physical presence or absence automatically opens or closes the bypass switch through mechanical contact, eliminating the need for separate control circuits or active control logic while maintaining full operational capability
3Reliability
If make-before-break mounting base pins are used, then data communication continuity is maintained during module insertion, but insertion timing precision is required
Solution Approach 1:
The connection process is segmented into distinct phases: first the bypass switch contact is made (establishing alternative path), then the primary data communication contacts are made (establishing normal path). This segmentation of the connection sequence ensures continuity by having the bypass path ready before the primary path is established, while the fixed mechanical structure provides the necessary timing precision
Data Source
AI summary
Disclosed is an industrial control device including a point-to-point backplane/point module architecture providing RIUP (Removal and Insertion Under Power) functionality where data communications between modules is maintained after the removal of a point module from the backplane. According to an exemplary embodiment, a backplane includes a plurality of passive mechanical bypass switches controlled by the insertion and removal of respective point modules, whereby data communicated bypass a removed point module interface and point-to-point data communications are provided to an inserted point module after an initial routine is executed by a microcontroller associated with the inserted point module.