The Software Design And Realization Of Electronic Host In Electronic Interlocking System

Railway station signal control system namely interlocking system is one of the important control system of modern railway signal system. At present, the most widely used interlocking system is 6502-electronic-centralized interlocking and computer interlocking. And along with the application of computer technology and communication technology in railway signal areas, computer interlocking system has been quite popular.But at present the common use of these interlocking system is not the real sense of computer interlocking system, because it's outdoor control module of bottom equipment is still completed by relay control circuit composed by relay. Therefore, to take place of relays by electronic module of microelectronics technology to control switch, track circuit, signals and other on-site equipments becomes the next important research and development direction in computer interlocking system.This article presents a frame structure of electronic interlocking system, designs and implements the electronic host software of electronic interlocking system.Electronic host refers to a function module that directly interact information between interlocking machines and electronic modules, so it plays a role called communication "bridge". Through analyzing the electronic interlocking system, Ethernet communication,CAN bus and other technology. This article completes the following job:design electronic host software electronic host and interlocking host communicate with each other through redundancy Ethernet, adopt UDP transmitting data, use RSSP-â… security agreement in safety layers. This article achieve the communication between electronic host and interlocking machine; electronic host and electronic module communication by CAN bus.This article puts forward the CAN communication protocol and realizes the software; electronic host uses double 2 vote 2 system, this article designs and achieve the Host standby switching mode of electronic host. Electronic host is DOS system, uses standard C language to program to realize the electronic software functions:the normal communication with interlocking machine; the data transmission with electronic module; Host standby switching of electronic host.