Safe and controllable communication method used for numerical control bus

Abstract

The invention relates to a safe and controllable communication method used for a numerical control bus. The method comprises the following steps that: a safety data message sender is taken as a master station and a safety data message receiver is taken as a slave station; an offset module is used to calculate and generate a CRC checking value in the master station, the CRC checking value is packaged into the safety data message and the safety data message is sent to the slave station; the slave station carries out CRC checking on the received safety data message according to the used offset module; if the checking is correct, the slave station continuously calculates and generates the CRC checking value through the used offset module, the CRC checking value is packaged in a response data message and is sent to the master station; the master station carries out the CRC checking on the received response data message according to the used offset module; if the checking is not correct, whether communication is ended is determined; if the communication is not ended, the master station continuously sends a next safety data message to the slave station; if the communication is ended, the communication is stopped. The method of the invention has the following characteristics that: safety intensity can be controlled; a residual error rate is low. And the method has many other characteristics.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a safe and controllable communication method for the field bus of a numerical control system. Background technique [0002] In the field of industrial control, the bus, as a medium for carrying data, a channel for transmitting commands and a link connecting various interfaces, plays a vital role in the efficient, accurate and safe operation of the entire control system. However, the bus application environment is complex, so that the data will be damaged due to system failure, electromagnetic interference and other problems during the transmission process, resulting in errors such as message duplication, deletion, insertion, incorrect sequence, destruction, delay and camouflage. If data corruption cannot be found in time, it will bring equipment loss and personal injury to the control system. Therefore, the transmission security of bus data has become the focus of bus comm...

AI Technical Summary

Problems solved by technology

At present, the CNC system is developing in the direction of openness and networking. At the same time, the CNC system itself is undergoing a high-speed and high-precision development process. However, the traditional cyclic redundancy check method adopts the form of single-packet check and static check, resulting in residual Defects such as high error rate and immutable security strength

The traditional cyclic redundancy check method can no longer meet the high-speed and high-precision requirements of the CNC system

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