Abstract:

In traditional distributed control systems, field instruments are usually connected to the control room using multi-core cables. In large-scale projects, cable materials, construction volume and project costs are all substantial. Due to the bandwidth limitations, traditional instruments are no longer able to meet the requirements of current digital applications. This article systematically compares traditional distributed control systems with Ethernet-APL-based control systems in terms of system architecture, instrument loop and signal transmission. The advantages of Ethernet-APL technology can be clearly seen. The problems in traditional control systems such as excessive cable materials, large construction volume and high cost can be effectively solved, and signal transmission is no longer limited by the bandwidth of instruments, demonstrating the application advantages of this technology in industrial digitalization.

Key words: distributed control system, advanced physical layer, Ethernet-APL, PROFIBUS PA