PLC Ring Topology via Intermediary Communication Units
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Solution Overview
Problem
Traditional block type PLC systems face limitations in the number of I/O contact points due to size restrictions and suffer from performance degradation and noise interference when external I/O modules are directly connected to the data line, leading to reduced data transmission speed and reliability.
Innovation Solution
A PLC system that combines direct I/O module connection with remote I/O modules using a network, featuring switching units and a ring topology configuration to extend I/O contact points without additional wiring, enhancing data transmission speed and reliability while reducing noise vulnerability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an I/O module is directly connected to the data line of the PLC to extend I/O contact points, then the number of I/O contact points increases, but external noise is applied and data transmission speed is reduced
Solution Approach 1:
A communication unit is introduced as an intermediary between the PLC and the extended I/O module. The extended I/O module communicates with the PLC through this communication unit rather than direct data line connection, which isolates the PLC data line from external noise while maintaining data transmission capability. This mediator approach resolves the contradiction by allowing I/O extension without direct physical connection to the main data line.
2Quantity of substance
If an I/O module is directly connected to the data line of the PLC to extend I/O contact points, then the number of I/O contact points increases, but the data line length increases and performance deteriorates
Solution Approach 1:
The communication unit serves as an intermediary that eliminates the need for direct long-distance data line connections. By using this intermediate communication device, the PLC can extend I/O functionality without physically extending the main data line, thus maintaining data line performance while increasing I/O capacity.
3Quantity of substance
If an I/O module is directly connected to the data line of the PLC to extend I/O contact points, then the number of I/O contact points increases, but the transmission speed of data and signal is reduced
Solution Approach 1:
The communication unit acts as a dedicated communication intermediary that handles data transmission between the PLC and extended I/O module independently. This separate communication path maintains high transmission speed by avoiding the bandwidth sharing and signal interference that would occur with direct connection to the main data line, thus resolving the speed degradation issue while enabling I/O extension.
Data Source
AI summary
Disclosed is a PLC system, the PLC system including a remote I/O module and an extended I/O module, thus configuring a ring topology with the remote I/O module and the extended I/O module.