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技术资讯 => Profibus DP电缆与PA电缆与有什么区别？	【打印此页】【返回】

发布日期：[2009-10-24] 共阅[6417]次

PROFIBUS – DP用于现场层的高速数据传送。主站周期地读取从站的输入信息并周期地向从站发送输出信息。总线循环时间必须要比主站（PLC）程序循环时间短。除周期性用户数据传输外，PROFIBUS-Dp还提供智能化设备所需的非周期性通信以进行组态．诊断和报警处理。　　①传输技术：RS－485双绞线．双线电缆或光缆。波特率从9.6K bit/s到12M bit/s。　　②总线存取：各主站间令牌传递，主站与从站间为主－从传送。支持单主或多主系统。总线上最站点（主－从设备）数为126。　　③通信：点对点（用户数据传送）或广播（控制指令）。循环主－从用户数据传送和非循环主－主数据传送。　　④运行模式：运行．清除．停止。　　⑤同步：控制指令允许输入和输出同步。同步模式：输出同步；锁定模式：输入同步。　　⑥功能：DP主站和DP从站间的循环用户有数据传送。各DP从站的动态激活和可激活。DP从站组态的检查。强大的诊断功能，三级诊断诊断信息。输入或输出的同步。通过总线给DP从站赋予地址。通过部线对DP主站（DPM1）进行配置，每DP从站的输入　　和输出数据最大为246字节。　　⑦可靠性和保护机制：所有信息的传输按海明距离HD＝４进行。DP从站带看门狗定时器（Watchdog Timer）。对DP从站的输入／输出进行存取保护。DP主站上带可变定时器的用户数据传送监视。　　⑧设备类型：第二类DP主站（DPM2）是可进行编程．组态．诊断的设备。第一类DP主站（DPM1）是中央可编程控制器，如PLC．PC等。DP从站是带二进制值或模拟量输入输出的驱动器．阀门等。 PROFIBUS-DP电缆推荐产品型号：V-3079型（西门子6XV1830-0EH10） PROFIBUS-PA适用于PROFIBUS 的过程自动化。PA将自动化系统和过程控制系统与压力．湿度和液位变送器等现场设备连接起来，PA可用来替代4－20mA的模拟技术。PROFIBUS－PA具有如下特性：　　（1）适合过程自动化应用的行规使不同厂家生产的现场设备具有互换性。　　（2）增加和去除总线站点，即使在本征安全地区也不会影响到其它站。　　（3）在过程自动化的PROFIBUS－PA段与制造业自动化的PROFIBUS－DP总线段之间通过藕合器连接，并使可实现两段间的透明通信。　　（4）使用与IEC1158－2技术相同的双绞线完成远程供电和数据传送。　　（5）在潜在的爆炸危险区可使用防爆型“本征安全”或“非本征安全”。 PROFIBUS-PA电缆推荐产品型号：V-3590型（6XV1830-5FH10）


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There is a making wow gold guide for lower levels. If you are interested in it or just at lower levels, pay more attention to this guide.There are countless of ways to earn money in World of Warcraft, but it is not even worth to list all the ways because it would take too much space. You probably just want to know about the very best ways of world of warcraft gold making and not some mediocre way.Professions are the most profitable way to earn wow gold money. That is if you pick the right profession for your way of playing World of Warcraft. But at the very beginning, the best professions to start with are Sinning combined with Mining or HerbalismBecause of the fact that Mining and Herbalism need a reagent-tracker to be active for you to see the spot to farm these on the minimap but Skinning doesn't need this.There are the core wow gold makers for the player between levels 1-59. Selecting two of these, you are most likely assured to get 100% more gold than you need for your mount at level 40. It is not hard to level up these professions, you just have to keep grinding the mobs and stop every now and then to pick up an herb or mine a vein.Mining is a cool profession. While grinding, you keep an eye on the minimap for the veins. Remember that you can just sell the copper, tin and sometimes even iron to vendors. The cost mining them, running to AH, compete with others is just not worth it. So you can vendor this unless there is a very big demand for it on AH.Skinning is easy and does not really speed down your leveling time since you need some rest after a combat and might as well do this skinning.Skinning is also very simple; you just try to kill more beasts than Humanoids, Undead and so on. So that every time that wow gold enemy mob goes down, you can skin it.If you don't kill Humanoids, you don't get any cloth. 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Altimeter watches are also great tools for food preparation. Here is another reason for the famous of Nike. The Nike shoe designers just keep doing it jordan shoes repeatedly. Yes, you are right.The latest type of Nike is always updated. Once more, they have put pen to paper and created yet another brilliant iteration of the Pegasus, the Air Pegasus+ 26. What is the best part? The latest evolution of this iconic shoe is now available to be customized—to your fit, to your terrain, to your run, to your nike shoes style—on NIKEiD.Of course, The Nike Air Pegasus+ 26 iD is the most customizable shoe to date.Is it the right number for you? You should choose your width and independent left and right sizing.The best point of this type is Cushioning. 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