基于 CAN总线的热网监控系统

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1、摘要本文主要叙述了基于CAN（控制器局域网）总线热网监控系统的设计及其监控主机软件的实现。该系统是一个工业现场的监控系统，适用于分布式供热网的换热首站，实现对热网首站的实时监控。系统采用分布式设计，硬件主要由监控主机、前端控制器和手持器组成。软件的开发基于Windows2000Server操作系统和MicrosoftSQLServer数据库系统，开发语言采用BlandC++Builder6.0。在软件设计中灵活应用软件分层思想，以提高系统的可移植性及灵活性。在上位PC机与前端控制器之间的通信中，使用现场总线CAN网络技术，制定了用户层通信协议。

2、在通信中，提出了动态优先级调度方案，保证关键信息可以及时上传；提出了三次握手规则，提高了通信的可靠性；采用软件滤波措施，提高了系统的实时性。为提高系统应用软件的通用性，论文对热网首站的共性进行了抽象，提出组态软件的整体结构，并且实现了简单的组态功能。由于本系统软件与硬件的通用性，可以推广到其它中小型应用场合。关键字：现场总线FCSCAN组态软件AbstractThispapermainlydiscussesthedesignofCentralStationoftheHeatingSystemandthesoftwaredesignandimpl

3、ementationoftheCentralStation’sMonitoringControlSystemoftheHeatingSystembasedonControllerAreaNetwork.ThesystemisanindustrialMonitoringControlSystemwhichisfitfortheCentralStation’sMonitoringControlSystemoftheHeatingSystemandcomposedofSupervisoryPC,LocaleControlerandHandedCont

4、roler.ThissoftwareisbasedonWindows2000ServerOperatingSystemandSQLServerDatabaseSystem.TheprogramminglanguageischosenasBorlandC++Builser6.0.Layeredsoftwarearchitectureisappliedtogetbetterperformanceofflexibilityandextensibility.CANFieldBusisadoptedinthecommunicationbetweenPCa

5、ndSingleChipComputertoimprovethecommunicationreliabilityandspeediness.Thedissertationpresentsadynamicschedulingschemetoensurethatthekeyfieldmessagescanbetransferredtothesupervisorycomputerintime.Aruleofthree-handshakingisintroducedtoimprovethereliabilityofthesystem.Famefilte

6、risusedtodecreasetheinterrupttimesincommunicationandimprovesthereal-timeperformanceofthesystem..Conventionalsupervisorycontrolsoftwareshavesomedisadvantagesinthattheyarelongindevelopmentcycleandbadinreusability.Toovercometheseproblems,theauthordesignstheconfigurationsoftware

7、platformfortheCAN-basedsupervisorycontrolsystemofthegatewaystationinheatingnetwork.Thesystemisflexibleinthearchitectureofsoftwareandhardware.Inspiteofitisdesignedforthegatewaystationinheatingnetwork,itiseasilyextendedtotheothersmallandmediumscaleindustrialapplications.KeyWor

8、ds:FieldBusFieldbusControlSystemControlerAreaNetworkConfigurationSoftwar目录1