A safe communication method for double-loop field bus in numerical control system

Abstract

The invention relates to a secure communication method for messages of a double loop field bus in a numerical control system. The method comprises the following steps: determining a master station and slave stations, dividing a transmission channel into a loop 1 and a loop 2, and determining the station numbers of all the slave stations; respectively packaging original effective data of the master station and associated data used for recovery into an original information security message and an associated information security message, sending the original information security message to all the slave stations through the loop 1, sending the associated information security message to all the slave stations for CRC (cyclic redundancy check) through the loop 2, if the check message is correct, selecting useful data from the message and packaging the checked right response message into the associated information security message for continually sending along the loop 2 till the master station, and meanwhile continually sending the original information security message along the loop 1 from the current slave station to the last slave station; and carrying out the CRC on the received response message by the master station, if the message is correct, finishing the communication. The method provided by the invention has the characteristics of strong real-time performance, high redundancy, low retransmission probability and the like.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a message security transmission method used in a double-ring field bus in a numerical control system. Background technique [0002] With the continuous development of the manufacturing industry, the complexity of the CNC system is constantly increasing, which also increases the probability of accidents. At present, the numerical control system controls the equipment through various message safety messages to ensure safety. However, in the process of message transmission, it is inevitable that errors will occur due to problems such as system failure and electromagnetic interference, which brings great hidden dangers to security control. Therefore, the transmission security of message security messages has become the focus of communication security research in the field of numerical control. [0003] At present, there are mainly two methods for the transmission security of ...

AI Technical Summary

Problems solved by technology

The numerical control system includes emergency stop buttons, safety switches, safety doors and other safety-related equipment, which are closely related to the safety of personal life and property, and put forward higher requirements for the transmission quality and real-time transmission of message safety messages. Therefore, several existing message transmission methods for message security messages have defects, and their security and real-time performance need to be improved

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