Xây dựng bộ chuyển đổi tín hiệu đầu vào cho PLC sử dụng chuẩn ethernet

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Tác giả: Văn Ngọc Đặng, Duy Minh Nguyễn, Văn Hoạt Ninh

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ Đại học Thái Nguyên, 2019

Mô tả vật lý: 173-179

Bộ sưu tập: Metadata

ID: 404977

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Chủ đề

Hiện nay, PLC (Programmable Logic Controller) không còn xa lạ đối với chúng ta, sự xuất hiện của PLC trong các nhà máy, xí nghiệp hay các công ty đã đem lại lợi ích rất lớn cho con người. Tuy nhiên, đối với các bài toán xử lý tín hiệu analog thì PLC gặp một số hạn chế đó là có rất ít đầu vào tín hiệu analog tích hợp sẵn trên CPU. Trên thực tế đã có các module chuyển đổi cho PLC nhưng giá thành cao, cần phải đồng bộ nguồn sử dụng, phức tạp trong quá trình lắp ráp đấu nối, chính vì vậy trong bài báo này chúng tôi sẽ trình bày giải pháp xây dựng bộ chuyển đổi tín hiệu đầu vào cho PLC có thể giao tiếp với các loại cảm biến bằng các chuẩn giao tiếp khác nhau như: I2C, SPI, OneWire, Analog và tạo ra sản phẩm có giá thành thấp mà vẫn đảm bảo được các hệ thống hoạt động tốt, ổn định trong môi trường công nghiệp. Module chuyển đổi tín hiệu đầu vào sử dụng Kit Arduino ghép nối với PLC theo chuẩn Ethernet (TCP/IP) trong đó Kit Arduino có nhiệm vụ thu thập tín hiệu từ các cảm biến có độ chính xác cao (3.3V, 5V) sau đó xử lý, tính toán rồi truyền dữ liệu lên PLC (24V). Bằng phương pháp trên ta có thể thực hiện các bài toán cho PLC với các loại cảm biến như: cảm biến nhiệt độ (LM35, TMP36), độ ẩm (DHT11, DHT12), ánh sáng (BH1750), cảm biến bụi (Sharp GP2Y10), thẻ RFID (RFID-RC 522), vv., Tóm tắt tiếng anh, Currently, the PLC (Programmable Logic Controller) is no longer stranger to human, their appearances in factories or companies have brought great benefits to us. However, regarding analog signal processing problems, PLC has got some limitations that there are very few analog signal inputs availble intergrated in the CPU. In fact, there are transforming modules for PLC, but they are high price, required to synchronize the source of use, complicated in the connection assembly process
therefore, in this article we will present the the input signal converter construction solution for PLC to communicate with sensors by different communication standards such as I2C, SPI, OneWire, Analog and create low- cost products while ensuring the systems works well and stable in industrial environment. Input signal conversion module uses Kit Arduino paired with PLC according to Ethernet standard (TCP / IP) in which the Arduino Kit is responsible for collecting signals from high- accuracy sensors (3.3V, 5V) then processing, calculating and transmitting data to the PLC (24V). By the above method, we can perform problems of the PLC with sensors such as temperature sensor (LM35, TMP36), humidity (DHT11, DHT12), light (BH1750), dust sensor (Sharp GP2Y10), RFID card (RFID-RC 522), etc.

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