Device and method for secure network protocol for field control

Abstract

The invention relates to a device and a method for a secure network protocol for field control. The device comprises a master node board card, a plurality of slave node board cards and a switching board card, wherein the master node board card is connected with a control system; the plurality of slave node board cards collect field information data; the switching board card is used for switching data between the master node board card connected with the control system and the slave node board cards collecting the field information data; each slave node board card comprises a central processing unit (CPU), a first in first out (FIFO) memory, a complex programmable logic device and a physical layer transceiver physical layer (PHY); and the main node board card and the slave node board cards are all provided with a data frame generator so as to generate the target address and the resource address of a data frame and transmit a transmitted data part and a check code. The device and the method achieve the independence principle of communication; both communication parties exchange data at the fixed period; a sender and a receiver are confirmed; and time for the sender between the board cards is determined.

Description

technical field [0001] What the present invention relates to is a kind of network protocol, specifically, what the present invention relates to is a kind of device and method for the safe network protocol of on-site control, especially refers to the device of the safe network protocol used in the on-site control in the nuclear power plant and methods. Background technique [0002] Before the 1970s, the analog quantity was used in the control system to convert and transmit the transmission and control signals, which had poor precision and was greatly affected by interference signals, so the control effect and system stability of the entire control system were poor. At the end of the 1970s, with the emergence of large-scale integrated circuits, microprocessor technology has been greatly developed. The microprocessor has strong functions, small size, high reliability, and is used in the control system through an appropriate interface circuit to improve the control effect; howe...

AI Technical Summary

Problems solved by technology

[0002] Before the 1970s, the analog quantity was used in the control system to convert and transmit the transmission and control signals. Its accuracy was poor and it was greatly affected by interference signals, so the control effect and system stability of the entire control system were very poor.

According to this working mode, the working process of switching boards is a black-box operation. Although its behavior can be restricted through certain settings, or through a certain way to understand the operation process, it cannot explain its determinism; it cannot give the lowest port to The transmission delay of the port; the communication system is based on the state, not the event; the question-and-answer method is used to communicate, which does not meet the principle of independence of secure network communication

[0005] Based on the above reasons, the existing technology cannot meet the requirements of on-site control in higher security levels, especially the safety network system and protocol used in the on-site control in nuclear power plants

Images