Research And Application Of TSN Security Protocol Stack For Intelligent Production Line

With the introduction of the concept of industry 4.0,the application of intelligent production lines in industrial production is becoming more and more extensive.Realizing the interconnection of control terminals and manufacturing equipment in the intelligent production line has become one of the important directions of the development of the next generation of intelligent manufacturing in China.However,the switched industrial Ethernet currently used in intelligent production lines shares the transmission medium.When different types of data streams converge on the switching equipment for re-forwarding,there will be a queuing phenomenon at the sending port,which will greatly affect the real-time performance of data communication.Secondly,the production environment of industrial Ethernet is relatively complex,and security problems caused by equipment failures and communication errors occur frequently.The existing industrial Ethernet is difficult to effectively detect and deal with these problems.Therefore,it is necessary to improve the industrial Ethernet to ensure that the transmission of data in the network has lower communication delay and higher communication security.In view of the real-time and security problems of existing industrial Ethernet,this paper introduces Time Sensitive Networking(TSN)on the basis of switched industrial Ethernet,and designs a TSN security protocol stack.The protocol stack includes TASWRR(Time Awareness Shaper-Weighted Round Robin)scheduling algorithm and SIEPC(Switched Industrial Ethernet Precheck)security mechanism.The contributions and innovations of this paper are as follows:1)In order to make periodic real-time data,aperiodic real-time data and non-realtime data in industrial Ethernet effectively schedule and forward in switching equipment,this paper presents a method of dividing communication time.The data communication time is periodically divided,and each communication period is divided into two time slices.Forwarding periodic data in the first time slice;Transmitting non-periodic real-time data in the transmission gap of periodic real-time data in the first time slice and in the second time slice,and preempting non-real-time data;The nonreal-time data is forwarded in the second time slice.Thus the periodicity of the periodic data and the real-time data are guaranteed.2)In order to meet the communication requirements of different types of data in industrial Ethernet,this paper improves the gate scheduling algorithm of time-aware shaper based on time-sensitive network,and proposes a TAS-WRR scheduling algorithm combined with weighted polling scheduling algorithm,and designs and implements the TAS-WRR scheduling mechanism.Firstly,the mechanism prioritizes the data according to IEEE 802.1 Q protocol standard.Secondly,the data communication time is divided into periods,and bandwidth is reserved for high-priority real-time data to ensure the real-time and periodicity of its communication.Finally,the weighted polling scheduling method is adopted to ensure the communication quality of high-priority data and effectively reduce the hunger phenomenon of low-priority data.Compared with the communication test of traditional industrial Ethernet,it can be seen that TAS-WRR scheduling mechanism can improve the real-time performance of industrial Ethernet communication.3)In order to solve the security problems caused by communication errors in switched industrial Ethernet,this paper designs a SIEPC(Switched Industrial Ethernet Precheck)security mechanism.Firstly,the mechanism inserts a security layer into the protocol stack of the data communication terminal and the switching equipment to add a security check field and check the data.Secondly,the security of the data is prechecked in the switching equipment,and the erroneous data is discarded so that it will not continue to communicate forward,so as to reduce bandwidth waste.Finally,the security check is carried out at the data receiving end to ensure that the data received by the user layer is correct.Through testing,the mechanism can effectively detect and process data with security problems,and can better improve the security of switched industrial Ethernet.