Industrial Network Communications
Industrial Network is a fully digital, two-way, multi-station communication system installed in an industrial production environment
There are three types:
(1) Dedicated, closed industrial network: This network specification is developed by each company and is often designed for a specific application area with high efficiency. However, when they are connected to each other, the indicators are uneven, and promotion and maintenance are difficult to coordinate.
The dedicated industrial network has three directions:
1 to a closed system to ensure market share.
2 Going open, making it a standard.
3Design-dedicated Gateway and open network connection.
(2) Open Industrial Network: Except for some of the simpler standards that are unconditionally open, most are conditional open or open to members only. The manufacturer must be a member of the organization and the product must be tested and certified by the organization before it can be used in the industrial network system.
(3) Standard Industrial Network: Industrial networks that comply with the international standards IEC61158, IEC62026, ISO11519 or European Standard EN50170, which all follow the ISO/OSI7 layer reference model. Most industrial networks use only the physical layer, the data link layer, and the application layer. The general industrial network is developed based on the existing communication interface, or the communication IC is designed by itself, and then the data transmission format is set according to the application domain. For example, DeviceNet's physical layer and data link layer are based on CANbus, and add application layer specifications for general I/O point applications.
The eight industry fieldbus standards currently recognized by IEC61158 are: Fieldbus Type1, Profibus, ControlNet, P-NET, Foundation Fieldbus, SwiftNet, WorldFIP, and Interbus.
The emergence of network technology has the following advantages for industrial control:
(1) Easy installation and wiring;
(3) easy to diagnose;
(5) Enterprise Management.