Wireless Parallel I/O Expansion for Multi-Port SEMI-E84 Control
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Solution Overview
Problem
Existing methods for expanding parallel input/output devices in manufacturing equipment require separate program development or protocol modification, limiting flexibility and increasing installation costs, especially when using wireless communication due to limitations in the SEMI-E84 communication standard.
Innovation Solution
A parallel input/output expansion device utilizing a wireless communication device, a basic input/output device, and multiple expansion input/output devices connected via serial interfaces, allowing identification and data transmission across multiple ports without modifying the SEMI-E84 protocol, using wireless communication and serial interfaces like RS-232, RS-485, RS-422, I2C, SPI, or USB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single parallel input/output device is used for multiple ports with wireless communication, then installation cost is reduced, but the SEMI-E84 communication standard limits signaling to only two ports
Solution Approach 1:
The system segments the control function by introducing a master parallel input/output device that coordinates multiple slave parallel input/output devices. Each slave device is responsible for controlling a specific port, while the master device manages overall communication and signal distribution. This segmentation allows each device to handle a limited scope (maintaining compatibility with SEMI-E84's two-signal limitation) while the collective system achieves multi-port expansion.
Solution Approach 2:
The master parallel input/output device acts as an intermediary between the wireless communication interface and multiple slave devices. It receives wireless signals, processes them according to port identification information, and transmits appropriate signals to the corresponding slave devices. This intermediary role enables the system to overcome the two-port signaling limitation by adding an intermediate layer of signal management.
2Reliability
If IR communication is used for multiple ports, then alignment between communication devices must be maintained, but this increases device complexity and installation difficulty
Solution Approach 1:
The system replaces the mechanical alignment-based IR communication with wireless communication that does not require physical alignment. The master parallel input/output device communicates wirelessly with the rail car's parallel input/output device, eliminating the need for precise line-of-sight alignment while maintaining communication reliability. This substitution of communication medium resolves the contradiction between reliability and complexity.
3Reliability
If the rail car communicates with one port, then adjacent ports cannot operate simultaneously, but this reduces productivity for equipment with multiple ports
Solution Approach 1:
The system segments the port control function across multiple slave parallel input/output devices, each independently controlling a specific port. When the rail car communicates with one port through the master device, the other slave devices remain independent and can simultaneously control their respective ports. This segmentation eliminates the mutual interference problem while enabling multi-port simultaneous operation.
Solution Approach 2:
The master parallel input/output device serves multiple functions: it manages wireless communication, identifies target ports through port identification information, routes signals to appropriate slave devices, and coordinates multi-port operations. This multi-functionality enables the system to handle both single-port and multi-port scenarios efficiently, improving productivity without compromising signal integrity.
Data Source
AI summary
A parallel input/output expansion device for equipment includes:a wireless communication device; a basic input/output device configured to generate output values for the plurality of ports based on data received from the wireless communication device via a serial interface, transmit the output values to each port, and transmit data collected from each port and data of a first port corresponding to identification information included in the received data to the wireless communication device; and a plurality of expansion input/output devices connected to each other through a serial interface and configured to transmit data of each port corresponding to the identification information included in the data received from the basic input/output device to the basic input/output device.