论文部分内容阅读
对二取二制式计算机联锁系统中的一项关键技术———通信技术进行研究。工作联锁机与备用联锁机之间的通信,是两台联锁机实现系统级同步的必要条件,也是整个系统实现故障安全防护(故障倒机)的必要前提。从数据分包方式、收发调度机制和差错处理原则等几个方面的分析表明,其工作模式简单、双机同步迅速、信息传输安全。上位机与联锁机之间的通信,采用冗余的通信网以及数据校验等安全措施,保证了车务终端与联锁系统之间信息交换的安全性,从联锁机发送、接收和上位机发送、接收四个方面的分析表明,其通信稳定性高,收发调度灵活,无通信时延。联锁机与安全智能I/O模块之间的通信,工作模式采用应答方式,分为数据预处理和CAN智能卡驱动两个通信层次,所采用的数据校验和正反码传输技术可以达到可靠的数据传送,该通信过程具有适应分布式系统控制、系统升级方便、多重安全防护等特点。
A study on the communication technology, one of the key technologies in two-system computer interlocking system. The communication between the work interlocking machine and the backup interlocking machine is a necessary condition for realizing the system-level synchronization of the two interlocking machines, and is also a necessary prerequisite for the entire system to realize the fail-safe protection (fail-over). Analysis from several aspects such as data subcontracting mode, sending and receiving scheduling mechanism and error handling principle shows that its working mode is simple, dual-machine synchronization is rapid, and information transmission is secure. The communication between the host computer and the interlocking machine adopts the redundant communication network and the data verification and other safety measures to ensure the security of the information exchange between the vehicle terminal and the interlocking system and to send and receive information from the interlocking machine Host computer to send, receive four aspects of the analysis shows that the high stability of its communications, send and receive scheduling flexibility, no communication delay. Interlocking machine and the safe intelligence I / O module between the communication, the work pattern uses the answer way, divides into the data pretreatment and the CAN intelligence card actuation two communication levels, the data verification and the positive and negative yard transmission technology which uses the data may achieve the reliable The communication process has the characteristics of adapting to distributed system control, convenient system upgrade, multiple safety protection and the like.