PLC Interface Conversion Device for Parallel Serial Communication
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Solution Overview
Problem
Conventional programmable logic controller (PLC) systems are limited by their inability to simultaneously use both parallel and serial interfaces, restricting the compatibility and expandability of expansion modules, which leads to low system expandability and inconvenience in module replacement.
Innovation Solution
An interface conversion device that connects a parallel interface and a serial interface, utilizing a device information recognizer for parallel communication and signal switching logic for serial communication, allowing the PLC system to support both interfaces and enabling the use of various expansion modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only one interface type (parallel or serial) is used in the PLC system, then the system structure is simple and easy to implement, but the system expandability and compatibility are limited
Solution Approach 1:
An interface conversion device is introduced as an intermediary component between the base unit and expansion modules. This conversion device includes a parallel interface unit that communicates with the base unit via parallel interface, and a serial interface unit that communicates with expansion modules via serial interface. The conversion device translates between parallel and serial communication protocols, enabling the PLC system to support both interface types simultaneously without requiring the base unit to directly implement multiple interface types, thus resolving the contradiction between system expandability and device complexity.
2Adaptability or versatility
If the PLC system supports multiple interface types, then expansion module compatibility improves, but the interface structure becomes more complex
Solution Approach 1:
The communication interface system is segmented into distinct functional modules: a base unit with parallel interface capability, an interface conversion device with both parallel and serial interface units, and expansion modules with serial interface capability. Each module is designed with a specific interface type, avoiding the need to make the base unit or expansion modules directly support multiple interface types. The interface conversion device acts as a bridge that handles the complexity of multi-interface support, while individual modules remain simple and focused on their specific interface type.
3Ease of operation
If expansion modules are limited to a single interface type, then the module design is simple, but module replacement and system reconfiguration become inconvenient
Solution Approach 1:
The interface conversion device serves as a mediator that enables expansion modules with serial interfaces to communicate with the base unit through parallel interface. This allows expansion modules to be designed with a single, simplified serial interface without compromising their ability to integrate into the PLC system. When module replacement or reconfiguration is needed, users can freely choose from various serial interface expansion modules without worrying about interface compatibility, as the conversion device handles the interface translation automatically.
Data Source
AI summary
The present disclosure relates to an interface conversion device of a programmable logic controller (PLC) system and a PLC system thereof. The interface conversion device of a PLC system according to an embodiment of the present disclosure is an interface conversion device that is applied to a PLC system including a base unit that controls an operation of the PLC system, a plurality of expansion modules that operate under the control of the base unit, and an interface that is a communication line between the base unit and each of the expansion modules, and is configured to connect between a first interface for parallel communication and a second interface for serial communication.