Modular I/O Terminal Layout for Expanding PLC Stations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing programmable logic controller systems have a limited number of I/O units that can be connected to a master processing circuit, requiring additional stations when the number of I/O units exceeds this limit, leading to complex wiring and potential erroneous connections.
Innovation Solution
The system includes I/O units with preceding-stage and subsequent-stage terminals connected to each other, along with a slave processing circuit that performs signal processing, allowing for easy expansion by connecting additional I/O units to existing stations without the need for additional cables, and utilizing multiple master processing circuits to distribute signal processing tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of I/O units connected to a master processing circuit is increased beyond the design limit, then the system can handle more devices, but additional stations must be installed which complicates wiring and increases connection errors
Solution Approach 1:
The I/O unit is divided into multiple independent terminal groups (first through fourth terminals) that can be selectively connected. Each terminal group can independently connect to different master processing circuits, allowing the system to expand I/O capacity without adding physical stations or complex wiring. The segmentation of terminal functions enables flexible assignment to different master circuits based on signal type and connection stage.
Solution Approach 2:
The I/O unit incorporates multiple master processing circuit connections (first and second master processing circuits) that can serve different functions simultaneously. The same I/O unit can connect to different master processing circuits depending on the operational requirements, providing universal functionality that eliminates the need for separate stations for different master circuits.
2Adaptability or versatility
If multiple stations are installed to accommodate more I/O units, then the system capacity increases, but the wiring around each station becomes more complicated and erroneous connections may occur
Solution Approach 1:
Multiple terminal groups (first through fourth terminals) are merged into a single I/O unit, consolidating what would traditionally require separate stations into one integrated component. This merging maintains system capacity while eliminating the need for multiple discrete stations, thereby reducing wiring complexity and connection error risks.
Solution Approach 2:
The I/O unit acts as an intermediary between multiple master processing circuits and various devices (main body devices and extension devices). By providing standardized terminal interfaces and selective connection capabilities, the I/O unit mediates connections in a way that prevents erroneous wiring while maintaining flexible system expansion.
3Quantity of substance
If separate stations are installed for additional I/O units, then more devices can be connected, but the installation and maintenance become more difficult
Solution Approach 1:
The I/O unit segments terminal functions into distinct groups (first through fourth terminals) with specific connection purposes. This segmentation allows for standardized, modular installation where each terminal group has a defined role, simplifying the installation process compared to configuring multiple separate stations with varying connection requirements.
Solution Approach 2:
The I/O unit provides universal connection capabilities to multiple master processing circuits through its terminal groups, allowing a single unit to replace multiple specialized stations. This multi-functionality simplifies installation and maintenance by reducing the number of different component types that need to be managed.
Data Source
AI summary
An I/O unit comprises: a plurality of first-stage-side terminals for connecting to a master unit or another I/O unit; a plurality of second-stage-side terminals that are provided in order to connect to the other I/O unit, and are connected to mutually distinct first-stage-side terminals; and a slave process circuit that performs signal processing and is connected to one of the plurality of first-stage-side terminals and to the second-stage-side terminal connected to that first-stage-side terminal.