PROFIBUS技术培训第6章(PDF 28)

®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page1LRExplosionProtectedIntrinsicSafetyPressureEncapsulationPROFIBUS第六部分PROFIBUS-PA技术培训®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page2什么是PROFIBUS-PA?定义PROFIBUS-PA=PROFIBUS-DP通信+对现场设备优选的传输技术PROFIBUS-PA=PROFIBUS-DP通信+对现场设备优选的传输技术PROFIBUS-PAJεx+PROFIBUS-DP®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page3什么是PROFIBUS-PA?应用范围Â变送器阀执行器等等Â通过串行总线系统连接Â在化学工业和过程控制中使用Â通过数据线对现场设备供电Â在危险区域(EExi型保护区域)应用PROFIBUS-PA=用于过程自动化的PROFIBUSJεx+®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page4PROFIBUS-PA适应所有过程自动化领域z对防爆和非防爆区域过程自动化的低端应用PROFIBUS-PA是优选的zPROFIBUS-PA完全满足化学工业用户组织(如NAMUR)对数字现场总线的要求π海上π石化工业π化学工业π发电和电力输送π化学爆炸试验π制药π食品饮料工业π水污水处理性能价格®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page5Zone2采用PROFIBUS-PA技术PA设备运行在下列防爆区域Zone0:危险的爆炸瓦斯气体经常或长期存在的区域Zone1:在正常运行期间危险的爆炸瓦斯气体有可能存在的区域Zone2:不希望在正常运行期间存在危险的爆炸瓦斯气体的区域Zone1Zone1Zone0Zone0Zone0®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page6PROFIBUS-PA与420mA系统的比较i总线耦合器1PNCPNCI/O模块(1-x)终端块(PNC)I/OmoduleX1终端块灰色线变送器供电源终端块Exi,蓝色线分配器连接盒传感器1...nPROFIBUSPAnPROFIBUSPA1总线耦合器n连接总线PROFIBUSDP4...20mA系统PROFIBUS-PA传感器1...niεxεx过程接近元件®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page7节省成本的潜力安装节省Ø电线ØPLCI/O板Ø安装元件(Ex-/电流隔离器等)Ø排列机架Ø空间减少错误减少安装时间®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page8采用PROFIBUS-PA节省的成本温度4...20mAPROFIBUS-PA(模拟)份额[%]价格[$]份额[%]价格[$]安装2184026580仪器设备481930521160规划26105016360开工51805120总计10040001002220节省45%$1780如下数据来自于Cologne市acker化工厂的实际经验®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page9PROFIBUS-PA的基本成份PROFIBUS-DP现场总线系统主站(1类)从站(现场设备分散I/Os信号循环控制器接到PROFIBUS-PA的链接器)主站(2类)PROFIBUS-DPPROFIBUS-PAJεx+®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page10PROFIBUS-PA的组态DCS/PLC段连接盒PROFIBUS-PADP/PA链接器24VPROFIBUS-DPεx+拓扑®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page11PROFIBUS-PA的组态现场设备的供电DCS/PLCPROFIBUS-PA31.25kbit/sΩ100µF1双绞屏蔽电缆总长度最大1,900米(保护类型[EExib],爆炸组:IIC)≥10mA≥10mA≥10mA≥10mA≥10mA24V现场设备供电:Ex区:max.10Non-Ex区:max.30Spurmax.30mDP/PALinkPROFIBUS-DPεx+120mA®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page12PROFIBUS-PA的成份网络元件耦合器和链接器DP/PA链接器(模板扩展中央模板最多带3个耦合器)DP/PA耦合器PROFIBUS-PA31.25kbit/s24VNon-Ex区:I320mA,最多30个现场设备24VNon-Ex:最多30个现场设备Ex:最多3x10个现场设备J24VJEx区:I120mA最多10个现场设备PROFIBUS-PA31.25kbit/sJJPROFIBUS-DPupto93.75kBit/sPROFIBUS-DPupto12Mbit/sεxεx®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page13耦合器的功能段耦合器在不同的传输技术之间提供一个网关gateway)PROFIBUS-PAIEC1158-2RS485PROFIBUS-DPz异步NRZ编码z1Byte=11Bit(8个用户位+1开始位+1停止位+1奇偶校验位)z可变的波特率z同步Manchester编码z1Byte=8Bitz固定波特率=31.25kBit/sDP/PA耦合器®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page14PROFIBUS-PA的组态互操作性DP/PA耦合器,DP/PA链接器24VPROFIBUS-PA制造商X制造商Z制造商Y制造商YPA-行规制造商的特殊规定PROFIBUS-DP®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page15PROFIBUS-PA的组态循环时间(例)DP/PALink24VPROFIBUS-PA31.25kbit/s10ms10ms10ms10msmax.1ms10ms循环时间=1ms循环时间=4x10ms+10ms=50ms循环帧(4个字节被测值+1个字节状态)非循环帧(读报警极限:4个字节)PROFIBUS-DP,12Mbit/s®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page16PROFIBUS-PA的组态循环时间(概述)10203050500ms100ms300ms每个DP段的循环时间每个DP段的现场设备数DP/PA耦合器每个DP/PA链接器30个现场设备每个DP/PA链接器10个现场设备90®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page17PROFIBUS-PA的组态现场设备访问DP/PA耦合器PROFIBUS-PA31.25kbit/s24VDP/PA链接器24V132112324V424V12从主PROFIBUS-PA31.25kbit/s23PROFIBUS-DPupto12Mbit/sPROFIBUS-DPupto93.75kBit/s从主®PROCESSFIELDBUSPROFIBUSInternationalCopyrightbyPROFIBUSInternational1997PROFIBUS-THEInternationalOpenFieldbusStandardTechnique,Rev.1,PartVI-Page18从现今的4-20mA很容易转移到PROFIBUS-PAPROFIBUS-DP,up