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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

The Organic Combination of Industrial Ethernet and Fieldbus

The introduction of Ethernet will provide the possibility for the subsequent development of the control system. Users do not need to invest in the technical upgrading alone. For this, any existing field bus technology is incomparable. At the same time, the development of robot technology and intelligent technology requires that communication networks have higher bandwidth and performance control engineering network copyright, and communication protocols have higher flexibility. Ethernet can meet these requirements well. Although industrial Ethernet has