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What is a distributed I/O device

When building a system in the application field, it is usually necessary to integrate the input and output of the process into the automation system. If the input and output are far away from the programmable controller, it will need to lay a long cable, which is not easy to achieve, and may reduce the reliability due to electromagnetic interference. Distributed I/O devices are the ideal solution for such systems:>Control CPU at the central position>I/O devices (input and output) run locally and distributed.> Powerful PRO

Modbus communication protocol

When communicating on a Modbus network, this protocol determines that each controller must know their device address, identify messages sent by address, and decide what action to take. If a response is required, the controller will generate a feedback message and send it using the Modbus protocol. On other networks, messages containing the Modbus protocol are converted to frames or packet structures used on this network. This transformation also extends the node address, routing path and error detection

Some Problems Needing Attention in Application of Fieldbus

1、 The concept of bus has a long history, but field bus appeared in 1984. Its emergence was not accidental, but due to the needs of users at that time, the competition among global manufacturers and the constraints of national regulations or decrees on safety, health care and environmental protection; It came into being after computer technology, communication technology and control technology developed to a certain extent. Therefore, the user's need is to generate the power of fieldbus, and the above three technologies

Characteristics and Advantages of Fieldbus

The characteristics of fieldbus The fieldbus system breaks the structure of the traditional control system and has the following characteristics in technology: (1) The open fieldbus of the system is committed to establishing an open system of a unified factory bottom network. Users can form an open interconnection system of random size with products from different manufacturers through field bus according to their own needs. (2) Interoperability refers to the realization of information transmission and communication between interconnected devices and systems;

Analysis of lightning protection knowledge of intelligent instruments

With the continuous development of the world's science and technology, the demand for industrial automation and production, the intelligent instrument industry has developed rapidly. However, most of these intelligent instruments and meters with a large number of micro electric devices applied internally have problems such as low insulation strength and low surge resistance. Therefore, the lightning protection of intelligent instruments and meters is very important, especially in the rainy season, so as to avoid heavy losses caused by accidents. Lightning protection of intelligent instruments and meters should start from two aspects, including external