现场无线

为您呈现一个充满新机遇的世界……

无需连接有线通信回路,横河电机的无线系统便可以实现以往难以实现或不经济的过程测量。

  • 横河电机提供一整套符合ISA100标准的压力变送器产品线。该产品线包括可测量各种过程连接的差压变送器、绝对压力变送器和表压变送器。

  • 横河电机提供双输入YTA510温度变送器和多点输入YMTX580温度变送器。

  • 带“现场无线通信模块FN110”的现场无线多协议模块,可作为现场无线设备与现场无线网络连接。该产品从连接的传感器采集传感器数据,并通过FN110将信息传送至现场无线网络。有关“现场无线通信模块FN110”的概述和详细信息,请参阅相应的一般规格书(GS)。

  • 横河电机提供IoT Enabled ISA100兼容网关、接入点、媒体转换器和管理站。通过以上基础设施来设计满足用户需求的网络。

  • Wireless Noise Surveillance is a new digital HSE system to provide a real time sound noise map monitoring system.

2018.03.06   出版“网关模块”(FN110-R1 / LN90)手册。
2017.11.21   出版手册“横河电机ISA100 Wireless™网关模块—构建小型现场无线系统的理想选择。
2017.07.18   更新手册“横河电机现场无线解决方案”。
2017.03.23   横河电机和Cosasco签订销售ISA100 Wireless™产品的协议—改善维护和增强安全性 – (请参阅 Cosasco网站: http://www.cosasco.com/
2016.12.08   横河电机发布开发出基于ISA100 Wireless标准的现场无线振动传感器—数据更新快、电池寿命长。(参见FN510现场无线多功能模块)。
2016.09.23   横河电机获得SICE奖(参见2016年9月26日横河电机新闻)。
2016.08.10   横河电机发布通用设备管理工具FieldMate® R3.02 – 显著降低设备维护的工作量 -
2016.08.08    2016年9月27日,横河电机将在荷兰鹿特丹举行ISA100无线终端用户会议 
2016.07.21    Murata 开始2.4 GHz宽带无线通信模块(已获得ISA100无线兼容认证)的批量生产。
2016.06.17    横河电机发布FN310和FN510 (ATEX认证)。
2016.04.22    横河电机发布FN110、FN310和FN510 (“美国和加拿大”FM认证和IECEx认证)。
2016.03.18    横河电机发布YFGW510现场无线接入点(ATEX和IECEx隔爆认证选项)。
2016.03.18    横河电机发布符合新立法框架(NLF标准)的现场无线YFGW系列。
2016.02.22    横河电机与挪威国家石油公司达成协议,共同开发现场无线系统 –实时监控工厂噪声水平。
2016.01.05    横河电机发布新宣传样本“横河电机现场无线解决方案”(BU 01W01A13-01EN)。
2015.11.04    横河电机发布制药解决方案“地面井水位监测”。
2015.10.13    Murata面向市场发布ISA100无线模块工程样本。
2015.07.28   添加两个应用实例“钢铁工艺中的PID回路温度监测”和“无内胎轮胎性能测试”。
2015.07.23   横河电机和GasSecure发布SIL2认证的LNG设施无线气体检测系统。
2015.07.03    横河电机发布工厂资源管理器(PRM)R3.20,包括ISA100 Wireless&trade现场设备改进的管理功能。



 

 

 

 

 

 

 

 

新的理念 "Wireless Anywhere"

Wireless Anywhere”理念可扩展基于ISA100.11a标准的现场无线系统应用。

横河电机宣布引入新的“Wireless Anywhere”业务理念,在工厂范围内使用符合ISA100.11a标准的无线通信技术,用于监测和控制应用。

anywhere 01_en r01.jpg

对于需要复杂无线控制技术的连续过程,横河电机于20107月发布了符合ISA100.11a标准的系统设备和变送器,拓宽了用户的设备选择范围。

基于“Grow”理念,横河电机于2012年发布了三套新现场无线系统设备以及现有无线压力和温度变送器的强化版,帮助用户扩展其工厂无线网络,充分利用现有资产。这些符合ISA100.11a标准的无线产品既可以用于构建高度可靠的大规模工厂网络,也可以与其他横河电机产品在中小型网络中配套使用,从而可以持续扩展其能力。

ISA100.11a标准能够确保高可靠性、应用灵活性、网络可扩展性以及与多种有线通信标准的兼容性,如FOUNDATIONTM现场总线、HART®PROFIBUS等。“ISA100.11a全功能”现场无线网络系统和设备采用先进的双冗余技术,可确保更高水平的可靠性、大规模扩展性以及远距离通信能力。

横河电机将积极促进“Wireless Anywhere”新理念,扩大ISA100.11a产品和相关服务的应用。这将进一步增强现有的“Grow”理念,通过其固有的可靠性、灵活性和开放性,可以鼓励引进无线通信技术。

ISA100.11a全功能现场无线系统的特点

anywhere 02_en r03.jpg

该系统通过采用先进的双冗余技术确保实时响应,并支持多达20个接入点和500台现场无线设备的连接,规模可观。当系统由主机系统和500台现场无线设备组成时,数据更新时间为5秒;当系统由主机系统和200台现场无线设备组成时,数据更新时间为1秒。经验证,现场无线设备的通信距离长达10 km*1,是传统系统的20倍。

横河电机的无线物理层(可靠的无线电)和系统冗余技术可以确保高可靠性。利用横河电机的Duocast技术,各现场设备将相同数据同步发送至两个指定的接入点。即使其中一个接入点出现问题,也可以确保不间断通信。网关和系统的组合可以进一步提高无线系统的可靠性。经验证,现场无线设备的通信距离长达10 km*1,是传统系统的20倍。

*1带高增益天线。地方法规可能会限制现场无线设备使用这种天线。

Wireless Anywhere理念

通过“Grow”理念和“Wireless Anywhere”理念,横河电机提倡工厂使用“ISA100.11a全功能”现场无线系统。为此,横河电机将采取以下三项措施。

1.将无线组件模块化,加速产品开发
横河电机将研发模块化的无线组件,这种组件可以在现场无线设备中配合使用各项技术。这有助于供应商在新传感器产品中实施ISA100.11a技术,加快上市时间。2013年底,横河电机计划发布带这些组件的新现场无线设备,并扩展产品系列。

2.促进ISA100.11a标准的采用
横河电机将与ISA100无线合规性协会(ISA100WCI)的其他成员合作,增加WCI成员公司的数量,促进ISA100.11a标准被广泛接受,从而扩展现场无线市场。为了提高ISA100.11a产品的市场占有率,横河电机可以为其他供应商提供模块化组件。

3.促进主机的有线和无线现场网络连接
l为了促进现场无线系统在监测和控制应用程序中的应用,通过实现有线和无线现场设备和系统与主机监测和控制系统的连接,横河电机可以提高工厂现场数字网络的效率。这就需要促进技术的发展,确保主机系统和现场设备可以利用各项协议互相通信。例如,ISA100.11a适配器可以使有线现场设备与无线网络连接。

anywhere 03_en r01.jpg

总结

横河电机倡导的“Wireless Anywhere”新理念解决方案可以与不同设备和生产现场使用的先进信息技术无缝配套使用。横河电机将继续研发用于监测和控制应用的无线设备,并与客户进行合作,通过实现理想的工厂运行确保用户的长期发展。

可靠的大规模新一代工厂现场无线系统

横河电机“Grow”理念的新架构

2010年,横河电机发布了符合ISA100.11a标准的无线现场产品,并引领了该项业务。如今,横河电机又发布了一套新的大规模、高可靠性的新一代工厂现场无线系统。

作为现场数字解决方案的核心,横河电机在开发该系统时主要关注以下三个重要特性。

  1. 可靠性:可靠的高性能现场无线和冗余技术
  2. 灵活性:支持范围广的灵活结构,适用于各种规模的工厂
  3. 开放性:开放的ISA100.11a标准,可连接第三方现场无线设备

该套新系统符合横河电机的“Grow”理念,在帮助客户成长的同时,也使横河电机得以发展,继续为用户提供及时的解决方

Grow_00_80E.jpg

新一代现场无线系统的优势

现在大部分现场无线系统安装在相对较小的区域中,但是以下需求不断增加:增加监控点的数量、覆盖更广的区域、扩展至过程控制以及诊断、监控和测量。为满足这些需求,横河电机开发了大规模、高可靠性的新一代工厂现场无线系统,可以管理多达500*台无线现场设备。
*根据YFGW410的软件版本可以处理的无线现场设备的数量。.

传统的小型现场无线系统主要作为附加的监控工具安装在易于查看的场所,如罐区和污水处理设施。这种系统有以下优势:改进库存管理、减少定期检查、自动化环境测量以及降低布线成本。

相比之下,工厂无线系统既可以在难以安装无线设备以及安装有大量生产设备的小区域中设置大量的测量点,又可以覆盖整个工厂。这就可以使客户在工厂的任何位置安装无线设备,并通过这些设备管理数据,以提高工厂的生产效率。

大规模、灵活的现场无线系统的结构

横河电机为新的现场无线系统研发了以下新产品:

  • YFGW410现场无线管理站
  • YFGW510现场无线接入点
  • YFGW610现场无线媒体转换器

YFGW710是现有的现场无线集成网关,将所有接入点和无线管理功能集为一体,从而可以轻松安装小型无线系统。在该新结构中,YFGW510用作接入点,与YFGW410现场无线管理站构成无线主干网络。
在该新结构中,YFGW510用作接入点,与YFGW410现场无线管理站构成无线主干网络。
因此,通过在整个工厂安装多个YFGW510现场无线接入点,可以构建无线子网络并互相连接,从而创建大规模的工厂现场无线系统。
YFGW510YFGW410可以通过以太网、光纤以太网、无线LAN、仪表电缆通信*等进行通信,因而可以在工厂中灵活安装。
*仪表电缆通信可在下一个阶段进行。
系统配置的示例如下所示。

System_01_65E.jpg

支持高可靠性现场无线系统的技术

横河电机现场无线的接收效率很高,其特点是无线物理层(可靠的无线电)具有高可靠性。该技术可以在无障碍的情况下进行长达600米的长距离通信,并且在“障碍物密集环境”的多路径环境中实现低数据包错误率。.

通过引进新技术提高网络层的可靠性。横河电机致力于以下两项技术。

1. Duocast

DuocastISA100.11a标准中指定的无线路径冗余技术。在传统的网状拓扑结构网络中,如果未在其中一个路径中建立通信,数据将经由另一个路径进行发送。但是,这样可能会影响实时性能,因为即使在同一超帧中数据也不会在同一时隙中发送,而是在之后的时隙中发送。

另一方面,Duocast在同一时隙中同步发送两项相同数据,只要其中一个数据发送成功,即可保持实时性能。因此,Duocast可以确保关键任务无线路径的冗余,在确保低延迟的同时,还有助于提高可靠性(请参阅下图)

Duocast_00_80E.jpg

Duocast可以克服任一接入点的故障以及无线路径中的偏差。

2. 双无线主干网络

YFGW510YFGW410之间的网络为无线主干网络。为提高网络的可靠性,其冗余由ISA100.11a标准指定,通过冗余YFGW410站获得。双YFGW410站的其中一个站可以在无线主干网络断开或异常时或其他YFGW410故障时运行(请参阅下图)

Redundant_00_65E R01.jpg

两个站通过同步通信电缆互相连接,其中一个站设定为运行,另一个站设定为待机。如果检测到设定为运行的YFGW410中存在故障,其功能和数据将快速切换至设定为待机的YFGW410中,以进行无缝持续通信。.

增强版无线变送器

随着工厂现场无线系统发布,无线差压/压力变送器和无线温度变送器的性能增强。

通信质量改善,带可拆卸天线

横河电机已经发布了天线可拆卸式机型。天线延长电缆和高增益天线*可用于该机型。可以使用天线延长电缆来调整天线的放置,而无需更改变送器的安装

使用高增益天线*可以延长通信距离。

*符合各国的无线电法律法规


功耗低,可延长电池寿命

天线可拆卸式机型的功耗低,电池寿命比传统产品长。根据情况,电池寿命可延长1.52倍。电池寿命的示例如下所示。

EJX B系列无线差压/压力变送器(放大器外壳代码89)
 更新时间为30秒时,寿命为10
 更新时间为10秒时,寿命为5

YTA510无线温度变送器(放大器外壳代码89,低功耗模式)
 更新时间为10秒时,寿命为10
 更新时间为5秒时,寿命为8

总结

横河电机研发工业无线技术长达十年,通过比较各种标准得出了以下结论:在工业测量和控制领域采用无线系统时,无线物理层必须尽可能地消除不稳定性(可靠的无线电),并且系统应将其进一步强化。

在各工业无线通信标准中,ISA100标准最适合实现横河电机的策略。因此,横河电机采用了该标准,并于2010年面向市场发布了ISA100产品。

通过研发工程师对全球100多个站点进行调查,横河电机发布了多种无线应用程序。

这种经验积累以及从众多用户获取的信息在充分利用ISA100标准(ISA100全功能)优势的发展过程中体现出来,使无线通信在现场数字化创新过程中的作用更加明确、更加安全。.

ISA100_Full_Functional_02_50E.jpg

无线通信的可靠性

大多数人认为无线通信容易断开,这似乎要归咎于人们对移动电话和无线局域网的日常使用经验。移动电话技术的快速发展意味着最新数字无线通信技术可以用来应对这个非常严峻的挑战。即使用户正在步行或处在高速移动的汽车或火车上,也可以保持高速数据传输速率和可靠性。.
然而,事实是用户的移动速度不确定,使用位置不固定,从而导致无线电波环境动态变化,增加了无线通信的困难程度,使得无线通信的典型特点即是不稳定。
同时,在许多工业测量应用中,经过勘察,测量位置一般固定在安装点。这样,即使用户移动,移动速度非常缓慢且移动范围有限,所需数据传输速率也比较低,因此易于达到无线通信所需的环境可靠性。换言之,可以提前设定确保无线通信的稳定环境。

在这样一个相对优越的环境中引进最新数字无线技术,可以保证不逊色于有线通信的稳定性。

实现数字通信技术的安全性

即使是固定的无线通信,也存在一些问题,例如其他无线通信的干扰和串扰,以及恶意使用相同频率的干扰。
此外,无线通信信号需要穿过空气到达周边地区,因此也会产生一些问题,例如第三方的拦截和窃听或从外部故意入侵无线网络。
这些问题的解决方法之一是无线通信的模拟到数字技术的进化。
模拟时代的无线通信,在安全方面比较容易受到攻击,因为它可以被任何使用相同频率的接收器拦截,故意中断和干扰也非常容易。
然而,无线通信中数字技术的引入显著减少了上述问题。下面是对数字技术的概述。

Security by digital communication technology

环境条件和无线通信

人们担心无线通信可能会受环境影响,实际上这些担心存在一些误解。
例如,现场无线通信容易受到强磁场的危害,降雨会导致通信中断等。在某些情况下,无线通信比有线通信更有优势。下面总结了环境条件和无线通信之间的关系。

  • 雷击电涌带来的损害
    雷击电涌是一种现象,即雷电流过电源电缆和通信电缆产生浪涌电流,从而导致连接的电子设备受损。由于无线变送器间不通过电缆连接,所以其雷击电涌风险非常小。然而,为防止受到直接雷击,需要有现场防雷措施。
  • 雷击产生的通信干扰
    据说雷击放电产生的电磁波频率范围非常广,从几个Hz1 GHz。然而,频率越高其功率越低,仅当放电和间歇通信碰巧同时发生时才会出现该问题。即使同时发生,也可以通过重新传送控制恢复。
  • 雨、雪和雾的影响
    现场无线通信使用的2.4 GHz几乎不受雨雪影响。这已经经过实验证明。一般情况下,10 GHz或以上的频率时通信开始受影响。
  • 通信断线的风险
    无线通信不受典型有线通信电缆断线问题的影响,即电缆因灾害损坏、在恶劣环境下老化、被野生动物损坏或被人恶意切断等情况下会发生的断线问题。
  • 强磁场的影响
    导致问题的磁场通常不是在无线通信的高频范围内,而是处于低频范围。无线通信在这方面更有优势,因为磁场产生的感应电流是与导体(导线)相关的。

独特的电池组技术

横河电机独特的电池组技术可以高效完成电池更换。

Battery pack

无线变送器中采用独特设计的电池外壳组件和电池组,即使在危险区域的现场也可以进行更换。电池组还可以便捷访问内部电池,以便根据需要进行更换和重新储备。这样可以最小化废物和成本,同时使电池更换过程尽可能高效。电池组内使用的电池为标准“D”单元锂-亚硫酰氯电池。它们不仅具有出色的电能-温度特性,而且寿命周期长,可以在各种环境中使用。

数字世界中的ISA100DPharp

通过空气数字传感,两项独特技术的结合可以实现真正的终端到终端。将DPharp数字传感和ISA100.11a(无线传感器网络的新工业标准)的公认优点结合,带来了真正独特的主张。先进的高精度数字传感具有无线配置的所有优点,由于其扩展无线传感器网络的灵活性,减少了工程和调试工作,从而可以满足未来的需求。

DPharpISA100.11a结合,表明横河电机为工业自动化行业持续提供卓越而前沿的解决方案的决心。可靠、安全、灵活且直观的新型无线传感器系列简化了无线配置、管理和操作的各个方面,同时实现了更高的标准。

无论是远程安装在上游的管道和井口装置,或下游的油罐区,或是减压蒸馏装置,还是装载码头,横河电机的无线变送器都将持续提供安全、精确、可靠、高度完整的过程测量,以满足客户的需求。

横河电机的无线变送器将通过减少操作盲点从而增加过程可视性,减少过程波动,增加产量,提高产品的可重复性同时降低成本并增加灵活性。

ISA100将带来真正可持续的生命周期效益,满足您现在以及将来的各种需求。

ISA100.11a无线通信标准

无线技术例如移动电话和无线网络已经成为我们生活中不可或缺的一部分。现在,对无线技术与仪器仪表的兼容性有更大的需求。所以,什么是无线技术的最佳应用呢?

包括横河电机在内的各供应商已经提供无线通信的简易应用,但无线通信还未被广泛接受,原因如下:

  • 大部分使用专有通信协议,从而限制了潜在应用。
  • 不能使用一套无线仪器仪表处理多个品牌的产品。
  • 工程师无法忽视对通信通道安全性和可靠性的担心。

但是现在,横河电机采用了针对工业自动化的ISA100.11a无线通信标准,并努力制作符合国际标准的用户友好无线设备。

ISA100.11a具有以下非同寻常的特性:

特点 说明
安全性 大的加密技术
高可靠性 实现36524小时无停车通信
电源管理 更长的电池寿命及预测电池更换周期
开放 设备可以从多家供应商处购买
多级变速 设备具有高速和低速更新周期
多功能 一个无线网络上有多个应用
扩展性 无线现场设备的数量、更长距离的通信和更新周期
全球性 许多国家支持的技术
通信品质管理 延迟控制和低错误率
多协议 由于可以与现有有线系统整合,因此只需要极少的投资
控制支持 扩展无线应用的范围

这些都是基于用户对工业无线传感器网络的需求;ISA100.11a工业无线标准一次满足所有这些需求。

通过引入基于ISA100.11A标准的工业无线技术,我们能建立高可靠性、有前途的新型仪器仪表,这可以解决很多问题。

使用ISA100无线技术控制应用的演示

为顺利整合使用单一无线基础设施的工厂监测和控制应用铺平了道路

seigyodemo_en_01.jpg

为本演示设计的系统是由Flowserve(福斯)公司的标准无线D3阀门定位器和横河电机的旗舰型综合生产控制系统“CENTUM® VP”、无线网关设备和DPharp EJX B系列无线差压/压力变送器组成的。现场无线设备全部符合WCI (ISA100 Wireless Compliance Institute)的ISA100 Wireless™,其特点是数据更新周期只有1秒钟,可以快速更新数据。利用冗余无线通信路径可以确保高可靠性。

本次演示系统中横河电机的产品:

  • CENTUM VP综合生产控制系统
  • DPharp EJX B系列差压/压力变送器
  • YEGW410现场无线管理站
  • YFGW510现场无线接入点

seigyodemo_en_02.jpg

无线水位控制演示的特点

  1. 通过DCS的PID控制进行现场无线设备的控制
  2. 最快数据更新周期:1秒
  3. 现代化的冗余技术Duocast和冗余现场无线管理站YFGW410
  4. Flowserve(福斯)公司的无线D3阀门定位器标准产品

seigyodemo_en_03.jpg

无线水位控制演示的详细信息

目的:横河电机确保无线控制每秒更新1次。
方法:分布式控制器与无线阀门定位器和无线差压/压力变送器通信,并将水位控制为四级。
构成:“CENTUM VP”分布式控制系统与ISA100.11a无线系统的基础设施通信,并通过PID控制进行水位控制。

横河电机开发用于控制应用的可靠ISA100无线系统——现场演示

利用ISA100无线技术,可以顺利整合单一无线基础设施下的工厂无线监测和控制应用。横河电机正致力于研发适用于监测和控制整个工厂的无线技术应用。横河电机的演示表明在无线控制应用中的实际工厂条件下首次使用CENTUM VP的方法。

无线传感器网络中使用横河电机的ISA100.a设备在,可增加通信距离并节约成本

您是否为获得适当覆盖范围而在无线传感器网络中增加额外的中继器和设备而烦恼?那么,请切换到横河电机的ISA100.11a无线系统,使用更少的硬件覆盖更大的区域,从而节省资金。使用横河的远程天线可选项,横河电机的接入点和无线变送器可以在设备间可靠传输3.4 km。这意味着在一个标准的4hops网络中,横河电机的无线系统能够覆盖半径13.6 km的区域。

选择适合您的小型/大型应用的可靠无线系统

可靠的无线解决方案始终是行业用户最关注的问题之一。本视频演示横河电机新发布的无线系统解决方案。它结合了ISA100.11a无线技术和横河电机系统设计的专业知识。横河电机的新无线系统进一步加强了现场设备中的“可靠的无线电”,在接入点(YFGW510)中配置Duocast通信方法,启用2台可以同时工作以实现整个无线系统可靠性的冗余管理站(YFGW410)。由于这个独特的设计,一个单独的横河电机无线系统可以非常灵活应对您的需求,可靠支持多达500个现场设备。请观看本演示。

横河电机无线引入“可靠的无线电进化”

横河电机无线解决方案具有非常可靠的无线链路功能,接收器具有理想的灵敏度。我们发现该功能可以为客户带来客观的新效益。

  • 长距离通信:(10 mW时最长600 m)
  • 障碍物密集环境中稳定
  • Wi-Fi的高度共存

横河电机现场无线:长距离通信实验 (600m)

横河电机的工程师测试了横河电机无线解决方案中的“长距离通信”功能。视频中显示600米通信的数据包错误率(PER)非常低。
我们将这个显著变化命名为“可靠的无线电进化”,并准备宣传该理念,为客户获得更大利益。本视频为“可靠的无线电进化”的概念视频。

横河电机获得2014年弗若斯特沙利文无线解决方案领域的全球技术先驱奖

横河电机宣布已获得2014年弗若斯特沙利文无线解决方案领域的全球技术先驱奖。技术先驱奖代表该公司在某个领域处于世界领先地位。
利用现场无线系统,工厂的现场设备和主机级别监测及控制系统间可以进行无线通信。这有许多优势。例如在难以接线的位置可以放置现场设备或分析传感器,消除了用电缆连接设备的需求,降低了安装成本。
20107月,横河电机发布ISA100.11a兼容无线系统设备、无线压力和温度变送器,并且继续完善其无线解决方案产品线。根据20134月提出的“Wireless Anywhere”理念,横河电机正在谋求通过研发新的ISA100 Wireless&trade设备推广现场无线系统的厂际应用。201312月,横河电机开始提供带内置天线的无线通信模块,帮助现场设备制造商大幅缩短研发无线解决方案的时间。今年下半年,横河电机也计划发布一款多协议无线适配器,这使有线现场设备或分析传感器能够作为ISA100无线设备使用。
弗若斯特沙利文授予横河电机该奖,是因为横河电机致力于研发ISA100无线解决方案,而该方案能够保证高可靠性、开放性和互用性。选择获奖单位时,弗若斯特沙利文根据是否有开发新产品的创新能力,是否能够完善现有产品、开发新的应用,是否有被市场接受的潜力,是否能够广泛引进科学技术等几个方面来评估公司。横河电机被认为在研发创新的现场无线解决方案领域做出了卓越贡献。
根据“Wireless Anywhere”理念,横河电机将继续扩大其ISA100无线解决方案的产品线,推进现场无线技术的应用。横河电机正致力于开发可以适用于监测和控制整个工厂的无线技术应用。
本手册中出现的公司名称、产品名称和商标均为其各自所有者的注册商标或商标

 

概述:

The client wanted to monitor the pressure of the gas well at offshore platform remotely to reduce maintenance cost and increase safety of maintenance personnel.

概述:

Remote leak detection for pipe line was needed to meet new environmental statute. However cabling earthwork is strictly restricted to protect land environment.

概述:

The client wanted to monitor the injection gas pressure of gas lift remotely in central control room. Antitheft measures are needed to install new equipments and cables.

概述:

In the event of a gas line shut down, gas supply must be maintained for a period of time with the use of LNG stored in road tankers. Each tanker must have its pressure monitored to prevent an over pressure situation arising.

概述:

ISA100 wireless pressure transmitters

概述:

ISA100 wireless temperature and pressure transmitters.

概述:

Delayed Coker is a type of coker who's process consists of heating residual oil feed to its thermal cracking temperature in a furnace. The most important variable in industrial furnace control is temperature. Temperature is measured throughout the furnace in different zones and temperature effects the materials being manufactured and therefore must be precisely monitored to prevent deviations in quality of the final product.

概述:

The client wanted to monitor the temperature on a chimney. Exhaust air is exposed to the heat on the way traveling from the inlet to the outlet in the chimney. Then constituent of the air transform to harmless elements. It is important to keep the temperature in the chimney as designed.

概述:

A battery room is used to storage batteries for emergency power management in the plant. Each substation has battery room and the storage batteries are lead-acid batteries which must be maintained within specified operating temperature limits. Temperature management is important to ensure a long service life of the batteries especially for the plant in desert climates.

概述:

Challenges

  • The distance is not so long, but there are many pipes and tanks ("Pipe Jungle") in the field.
  • Had to avoid the obstacles and take care multi path condition.  

Solution

Repeater is installed on high place between control room and monitor position. The extend cable is used for antenna of Gateway.

  • Temperature Transmitter (YTA) x1, Pressure Transmitter (EJX) x2
概述:

Geothermal power plants create electricity from geothermal energy. These power plants are similar to other steam turbine station; however their heat source is that of the earth's core. The created steam is used to turn the turbine for the production of electricity. Technologies include Dry steam, Flash steam and Binary cycle power stations with Binary cycle being the most common geothermal plant in current production. In the process of geothermal power generation the facility needs to monitor various processes, as in this case steam line pressure sits in remote from control room's location.

概述:

Employ the ISA100.11a-compliant YTMX580 Multipoint Wireless Transmitter. The YTMX580 has 8 channels of universal input, which is perfect for multipoint measurement applications, and it can withstand harsh operating temperatures of -40 to 85 °C.

行业:
概述:
  • Wireless temperature measurement gateway x1, transmitter (YTA) x1: on a buoy
  • High quality wireless communication was confirmed.
    Note: as the PER may increase due to antenna direction changes on the buoy, a repeater on the buoy is recommended
行业:
概述:

Pressure measurement of tubeless tyres to monitor the air loss is one of the key performance tests in the tyre manufacturing units. Relocation of tyres from one testing rack to the other for various tests and frequent movement of the testing setup for conditional tests to various locations calls for cable free implementation for ease of handling.

行业:
概述:

A horizontal rotary miller used to grind the limestone rocks with metallic balls as grinding stones. This is used as the raw ingredient to produce cement powder. The temperature needs to be monitored in order to control the process and the quality of the final product. The user was using an induction temperature measurement based on a rail system that was very fragile and therefore unreliable.

行业:
概述:

Both bulk and finished inventories are stored in distributed tank farm remote from the site operations. These are difficult to instrument due to the infrastructure cost involved. These are then monitored daily by patrol rounds. While effective, this method does require a large skilled labor force to monitor all of tanks. This can impose an additional risk when the stored medium is of a hazardous nature.

概述:
  • Temperature monitoring is required to prevent wind-fueled fire hazards.
  • The measuring points are up to 600 meters away from the control room.
概述:
  • Daily manual reading of pressure and temperature gauges with report by phone.
  • The customer wants to change measurement from off-line to on-line.
  • Cabling for wired transmitters in huge plants (up to 300 meters long) is expensive.
概述:

Install a YTMX580 on the side of the rotating furnace that can wirelessly transmit measured values from multiple temperature sensors.

概述:
  • Temperature is monitored to maintain consistency of the viscous fiber entering the drum.
  • Existing system requires manual temperature readings.
  • Wired temperature measurement is not available because the tank is rotating.
概述:
  • Manual temperature reading requires walking about 130 m and climbing up and down elevated sections of the dryer stages.
  • Multiple temperature measurement points along the various stages of the dryer require many cables to the control room.
  • Very high humidity.
概述:
  • Wireless temperature measurement
    Gateway x1, transmitter (YTA) x1, repeater x2 (The 2 repeaters are for redundancy)
  • Extended antenna to circumvent obstacles and improve the radio path for stable measurement (communication was unstable when the height of the antenna was low).
概述:
  • Wireless pressure and temperature monitoring.
  • Repeater was set under the gateway.
  • The maximum distance between the repeater and transmitters is approximately 500m.
概述:

ISA100 wireless temperature and pressure transmitters with orifice plates allow:

  • No cabling installations or maintenance.
  • Small amount of hardware and simple equipment implementation means minimizing potential vandalism.
概述:

ISA100 Wireless Monitoring  

  • Gateway x1, Temperature Transmitter (YTA) x3, Pressure Transmitter (EJX) x1, Repeater x1

Gateway is installed at control room and 3m height extended antenna is set.

概述:
  • Temperature Transmitter (YTA) and Pressure Transmitter (EJX) are installed at each monitoring point.
  • Repeater is installed on high position.
概述:

 Ground water well level monitoring is needed.

行业:
概述:

Blending plays a key role in industries such as food, healthcare and chemicals etc. Temperature and vacuum measurements are very important in minimizing the moisture content to ensure the quality of the final product. Strictly maintaining them throughout the process ensures the final product yield.

行业:
概述:

Temperature plays a key role in storage of Molasses to maintain the chemical properties of molasses. When temperature rises over 40.5 degree C, destruction of structure in sugar occurs, which results in losing the feeding property of molasses. There is also a safety concern that a rise in temperature can lead to a rise in storage tank pressure leading to an explosion of the tank.

行业:
概述:
  • Temperature monitoring at a tank farm
  • Temperature and pressure monitoring in tank jungles, three vertical monitoring points.
行业:
概述:

ISA100 Field Wireless transmitters

概述:

Direct Reduction Iron (DRI) is one of the processes to reduce oxygen from iron oxide pellets for steel plant. More than 90% of DRI processes use heated LNG as process gas where PID control for temperature or interlock control is of vital importance.

行业:
概述:

Customer needed efficiency improvement of steel manufacturing by temperature monitoring for heat/cooling equipment. Previous system required periodic compensation lead changing.

行业:
概述:

An induction furnace melts metal by creating very large currents in the material. These currents are induced using three electrodes positioned inside the furnace. The furnace is automated so that once the material has been melted, the electrodes are removed and the furnace then tips the molten metal into a crucible where it can be easily transferred to the production line where it will be cast into ingots. The atmosphere is extremely aggressive and the wired infrastructure is both expensive and very unreliable to maintain. The furnace control requires a total of 20 measurement points distributed around and inside the furnace. The harmonic field effects caused by short circuit 40,000 A (300V). The causes significant interference.

行业:
概述:
  • Wireless temperature measurement 
    gateway x1, transmitter (YTA) x1
    repeater x1: between gateway and YTA.
  • High quality wireless communication was confirmed.
    With repeater at center: The packet error rate was 0%.
行业:
概述:
  • Oil level measurement of diesel tanks that feed fuel to their diesel generator's which are at three locations and 400 meters apart from each other.
  • Also to measure level , pressure and flow to and from their main storage yard.
行业:
概述:

ISA100 Wireless Temperature and Pressure Transmitters

  • Gateway x1, Temperature Transmitter (YTA) x1, Pressure Transmitter (EJX) x1

High quality wireless communication confirmed

  • Packet Error Rate (PER) is 0 to 2.5%/ 5 days
概述:

Caustic soda and hydrochloric acid, produced in electrolyzer plants, are fundamental materials used in varieties of industries; chemicals, pharmaceuticals, petrol-chemicals, pulp and papers, etc. Profit is the result of the effective production with minimized running / maintenance cost. Proper control of the process brings you stabilized quality of products with the vast operational profit.

概述:

Continuous technology improvement is ongoing in the pulp & paper industry to obtain the best possible performance. The improved plant performance translates to the higher quality improvement and lower cost, and simultaneously environmental friendly plant operation.

行业:
概述:

One important risk to manage with regard to coal stacks is preventing fires due to spontaneous combustion.

行业:
概述:

The use of wireless technology in industrial automation systems offers a number of potential benefits, from the obvious cost reduction brought about by the elimination of wiring to the availability of better plant information, improved productivity and better asset management. However, its practical implementation faces a number of challenges: not least the present lack of a universally agreed standard. This article looks at some of these challenges and presents the approach being taken by Yokogawa.

概述:

Standards provide many benefits to the automation end user. Standards promote choice, interoperability, transparency and ensure that things work as they should (at least insofar as the standard is defined). The influx of wireless technology into the world of process automation has brought forth its own standard—ISA100—a major standards initiative managed by the International Society of Automation (ISA).

概述:

When distributed control systems (DCS) first appeared on the industrial automation scene in the mid-1970s, the focus was on control and operator interface. While control and human machine interface (HMI) are still important, today's DCSs have evolved to place increased emphasis on integrating plant-wide asset and operational information to enable operational excellence. 

概述:

Wireless trends: Choosing a wireless network requires evaluation of communication protocols, device availability, and present future user needs.

概述:

Temperature control of exhaust gasses coming off various combustion processes in refineries and related facilities is often critical to effective pollution abatement and compliance with applicable regulations. There are specific temperature windows where toxic gasses can form or other substances can condense, causing corrosion and other harmful effects, so operators need to make sure the process is running at the correct levels.

Stacks, chimneys and other gas handling equipment can take all sorts of forms depending on the application. Some may include scrubbers, gas cooling, chemical injection, afterburners or ambient air mixing—but a common element is the need for effective temperature measurement of the gas at various points in chimneys (Figure 1).

Given the length and height of a chimney, its associated ductwork and ancillary systems—there can be dozens of sensors inserted at strategic points from one end to the other—providing the process automation system and the plant operators with critical temperature data. These sensors are often in hard-to-reach locations where installation and maintenance are difficult. While these sensors are often spread over a great distance, they must connect back to one central point where the larger gas treatment system is controlled.

Figure 1. Chimneys found in refineries

Figure 1. Chimneys found in refineries and other hydrocarbon processing facilities often require temperature monitoring.

Monitoring a Refinery Main Chimney

At a refinery in the Americas, the main chimney is located 300 m away from the main control room, and there are about 30 temperature sensors mounted on the structure, the highest of which are 30 m above the ground. Wiring for such an installation was going to very challenging, so the company instead installed an ISA100 wireless network.

When the refinery was designing the system initially, it was clear the cost of individual wireless transmitters for each temperature sensor would be expensive and take too long to install. To alleviate these issues, the refinery selected Yokogawa YTMX580 Multi-Input Temperature Transmitters, each of which can accept up to eight individual sensors and send the data back via a single wireless transmitter (Figure 2). Each unit can accommodate a variety of RTD and thermocouple types to meet application demands.

This approach minimizes the amount of required wiring while also cutting the cost of the wireless infrastructure. Four of these multi-input transmitters are installed at the facility to service the group of temperature sensors, eliminating the need to add cabling to the control room. The plant’s wireless network backhaul infrastructure brings data from the chimney to the operators so they can monitor system performance in real time.

The success of this installation has given the plant the confidence to extend the ISA100 wireless network using Yokogawa’s Plantwide Field Wireless infrastructure.

Figure 2. YTMX580 Multi-Input Temperature Transmitter

Figure 2. Wiring temperature sensors installed in a chimney back to a control room can be challenging and expensive, so many plants and facilities are instead implementing wireless solutions, such as this Yokogawa YTMX580 8-input temperature transmitter.

 

行业:
概述:

The greatest advantage of native wireless field instrument and actuator devices is their lack of cables for data transmission or power. Eliminating these tethers also eliminates their associated costs in time and money for installation and ongoing maintenance. Companies have adopted the ISA100 wireless standard for a variety of reasons, but the most critical is its ability to support reliable communication in process manufacturing environments. ISA100.11a (IEC 62734) was designed through cooperation among device and system vendors working with process automation end-users to create a platform able to satisfy all involved. Figure 1 illustrates a typical device-level network topology using ISA100.11a wireless instruments.

Figure 1. A typical device-level network topology using ISA100.11a wireless instruments

Figure 1. The ISA100.11a network exists at the device level, supporting communications between field instruments and actuators.

Wireless field devices provide many possibilities for operational cost reductions along with improved performance and facility management. But in many existing plants, most field devices are already installed on wired networks, which often are not capable of providing all the information available from HART-compliant smart devices. Wireless can be used with new devices, but it can also extend the communication capabilities of existing instrumentation, realizing their diagnostic and other extended capabilities.

The User Case for Wireless Adapters

Unless there is something seriously wrong with existing wired networks, no end-user is going to rip out and replace working wired devices in a process plant. However, when new devices are added, the plant may decide not to extend the wired networks. New field instruments and actuators may be available as self-contained wireless devices, or they may only be made in a conventional wired version. Those of the latter category will need to be configured to communicate with a wireless network by adding a wireless adapter.

A wireless adapter can function in two modes. First, it can add complete wireless communication capability to a conventional wired instrument. All the data from the device can be sent via the wireless network without the need for any data cables.

Second, it can extend the communication capability of an existing wired device. Many wired device-level networks are not capable of communicating any information beyond the most basic analog signal representing the measured process variable. Smart devices installed on such a network cannot send the additional information they generate, stranding it at the source. Adding a wireless adapter allows it to send the additional information using the wireless network while continuing to use the wired network for the transmission of the process variable.

When an adapter is added to a conventional wired device, there are multiple powering options. The adapter can be outfitted with its own internal power supply and function independently. If the instrument needs power, the adapter can support it, eliminating the need for power cables.

Features of the Wireless Adapter

The Field Wireless Multi-Protocol Module is designed to work with HART-compliant field devices and provides a range of basic communication and operational functions:

  • Converts HART data into a format suitable to send via an ISA100.11a network,
  • Sends HART commands for configuration and troubleshooting,
  • Provides its own internal power for data transmission, and
  • Provides power for a device needing an external source.

Figure 2 shows an example of how to use the Field Wireless Multi-Protocol Module with HART-compliant devices. This adapter has all the necessary ISA100 communication functions built in and only requires connection to the field device.

Figure 2. An example of how to use the Field Wireless Multi-Protocol Module with HART-compliant devices

Figure 2. The Field Wireless Multi-Protocol Module can be connected to a HART-compliant device. The module mounts separately, allowing it to be positioned for most effective wireless propagation regardless of where the instrument is located.

Typical Wireless Adapter Applications

There are many ways in which the Field Wireless Multi-Protocol Module can be used in a process plant, but most applications fall into one of these categories:

Realizing full functionality of existing devices while saving on cabling costs, installation hassles, and future maintenance.

Most plants have large numbers of HART-compliant devices installed to monitor and control all manner of process variables (Figure 3). Most of these are connected via wired device-level networks. The Field Wireless Multi-Protocol Module converts these into ISA100.11a-compliant wireless devices without any modifications. If a plant or process unit requires renovation, the plant can decide to repair and maintain the wired network, or simply eliminate parts of it. If it costs $100 per meter of cable installation in explosion-proof zones, replacing just 100 meters of cabling with wireless means saving $10,000 in site work. In the case of a major plant upgrade, where sensing points are being removed or where aging cables must be replaced, wireless adapters allow the use of existing HART-compliant devices without cable reinstallation and maintenance.

Figure 3. Any HART-compliant field device can be mated with the Field Wireless Multi-Protocol Module

Figure 3. Any HART-compliant field device can be mated with the Field Wireless Multi-Protocol Module.

Extending wireless communication to conventional devices.

Companies embracing wireless field devices and networks may be constrained by the limited selection of native wireless devices available today. While the range of choices is growing, some types of devices, particularly those with high power consumption, are only available in conventional wired configurations. In such cases, the Field Wireless Multi-Protocol Module can convert any wired HART-compliant instrument or actuator from any vendor to wireless.

Gathering and sharing data from smart devices. 

While the process variables from HART-compliant devices in an existing plant are sent to the plant’s automation system through the field device network, other information, such as device condition information and other diagnostic capabilities, can be of great value to the maintenance department. It can collect and manage such data, and use it when analyzing maintenance schedules, maintenance records, repair parts usage, and so on. If the existing wired field-device network cannot extract that information and collect it for sharing interdepartmentally, those gains cannot be realized. Upgrading the network can be a complex and costly undertaking, but the information can be sent via the wireless adapter. Adding a Field Wireless Multi-Protocol Module allows maintenance department to capture HART commands and diagnostic information from the 4-20 mA line with little change to the installation. The adapter can work with two-wire and four-wire device types. In case of four-wire devices, an external power source can be connected to the device, making it easy to support devices with high power usage.

Deploy HART-compliant devices in remote areas where no data or power cables are available.

The Field Wireless Multi-Protocol Module can extend power to an external device, which makes it simpler to deploy HART-compliant devices in locations where wired field-device networks don’t reach and where no power may be available. Under favorable conditions, the adapter can cover a distance up to 500 m in any direction, and more than 1 km if routers are used. For example, combining a HART-level instrument with a Field Wireless Multi-Protocol Module provides a means to measure the water level of rivers and reservoirs (Figure 4). And since the adapter weighs less than 1 kg including its batteries, it and its connected HART-compliant device can be moved easily, enabling flexible measurement point changes.

Extend wireless network range by acting as a router.

In situations where distances between wireless field devices are very long or where large metallic structures create barriers to effective wireless signal propagation, a Field Wireless Multi-Protocol Module can be used as a router to relay communication to and from other wireless field devices (Figure 4). Another ISA100.11a native wireless instrument can serve the same function, however, in many situations, it may be easier to use an adapter as a dedicated router since it is light and compact. It can also be located strategically to fill out the network most effectively.

Figure 4. A Field Wireless Multi-Protocol Module can be used as a router to relay communication to and from other wireless field devices

Figure 4. The geographical coverage of a network can be extended by adding routers to relay signals and reinforce weak sections of the mesh. Routers can be located wherever they can do the most for the network, separate of any specific instrument.

Conclusion

The Field Wireless Multi-Protocol Module is designed to convert existing wired HART-compliant instruments and valve actuators into wireless devices. It provides flexibility to add new devices in existing plants using wireless field-device data networks, reducing cabling installation and maintenance costs. It also expands the types of wireless sensors available and simplifies device installations. Many plant operators find the wireless adapter to be a useful device able to help existing plants enjoy the benefit of wireless sensing.

概述:

One of the first steps when creating a new wireless instrumentation network using ISA-100 wireless, or any other industrial wireless network, is a site survey. This step is not part of any wireless standard, nor is it likely part of any network management platform, so it requires some creativity. Radio propagation patterns can be difficult to predict, but following a few basic design guidelines ensures a much higher level of success.

Some wireless consultants make the process very complex using simulations and reading test signals, but these often do not ultimately match the real world. Other approaches are simpler and involve taking a few distance measurements and establishing sight lines, which often works just as well. For this article, we will concentrate more on the latter, simpler approach.

ANSI/ISA-100.11a-2011 (IEC 62734), Wireless Systems for Industrial Automation: Process Control and Related Applications, networks are designed to support wireless field instrumentation. This protocol specification is part of the larger ISA-100 wireless series. Although network management platforms have an extraordinary capability for self-organization, this feature cannot overcome unreliable radio links.

But, the network management platform can use its diagnostic capabilities to measure the health of the communication and the devices. It can identify unreliable links so they can be fixed, and with improved communication, the network manager can reestablish a reliable link.

How Signals Propagate

Although it is not a perfect model, thinking of radio in the same way as visible light is accurate much of the time. Wireless networks depend largely on line of sight (LOS). If a wireless flow meter is trying to transmit to a gateway in its LOS, the likelihood of a good link is very high. More potential obstructions are transparent to radio frequencies than visible light, but this is affected by frequency. A leafy tree is transparent to signals at 90 MHz, but 2.4-GHz signals will suffer some attenuation.

Metallic objects are the great enemy of radio propagation, but can also help under the right conditions, which is why refineries and chemical plants provide many challenges for wireless networks. In one case, a steel-shell storage tank can be helpful by reflecting a signal, while other times it is as an obstacle. Like visible light, much depends on the surface angles.

General wireless principles say to avoid metallic surfaces when placing antennas for field devices, such as process instruments and actuators, routers, and gateways. The best situation is to mount the antenna vertically so that it is unobstructed on all sides (figure 1). If a gateway is mounted next to a metallic pole, the signal will be attenuated, even on the side away from the pole. It is far better to move the antenna to the top of the pole, so it can extend into free space, or to extend the antenna mounting horizontally, so there is at least a 1-meter gap between the antenna and the pole.

Figure 1. The best signal propagation

Figure 1. For the best signal propagation, each antenna should be mounted vertically with at least 1 m of clear space around it horizontally. This normally means mounting the antenna as high on a structure as possible.

Understanding the Fresnel Zone

Elevated antenna placement is important, because radio communication does not move in a tight beam like a laser. To send the signal from one point to another efficiently, some area in the shape of an ellipse is required. This area is called the Fresnel zone (figure 2). The amount of room available for the signal to spread has a huge effect on signal strength and the distance it can carry, since the longer the distance, the fatter the zone needs to be in the center. Anything violating the zone, which could even be the ground itself, attenuates the strength. Therefore, trying to squeeze a signal through a narrow space, even though it may allow direct LOS, can result in signal attenuation.

For example, where the LOS side clearance has an open space with a radius of 4 m, the communication range can be 500 m. However, when trying to send the signal through a more constricted area where the open space radius is only 2 m, the effective distance will be cut by 75 percent to 128 m. Having open, unobstructed space makes a huge difference, but this is typically a problem in most congested plant environments. This is why mounting devices and antennas as high as possible is so important.

Figure 2.  The Fresnel zone area

Figure 2. Radio waves tend to propagate through an elliptical space formed between the two antennas. The longer the distance, the larger the required diameter at the center. This space should be as unobstructed as possible to avoid signal attenuation.

Meshing vs. Routing Devices

ISA-100.11a has mechanisms for device-to-device meshing, but the more desired network topology is one where a field device can communicate directly with the gateway, or directly to a router connected to the gateway (figure 3). The goal is to avoid the need for meshing device-to-device, because sending signals between multiple field devices slows down data movement and taxes the devices' batteries.

To facilitate these transmissions, gateways and routers should be mounted as high as practical to clear any surrounding equipment and permit clear LOS connections. My company calls this practice of having a mesh of routers communicating above the plant equipment a sky mesh, and it takes advantage of more powerful transmitters than are practical for individual wireless field devices.

Placement of individual field devices is not as simple. Most native wireless devices, such as a differential pressure instrument, have an integral wireless transmitter and antenna (figure 4). This is very convenient, but can complicate signal propagation. Placement in the process piping or vessel often dictates where the device must be mounted, the antenna orientation, and the surrounding obstructions. Using an antenna extension can address these issues. Another alternative is to add a router mounted as near to the instrument as possible and clear of obstructions. If more than one instrument is in the same difficult location, a single router can service a group.

Figure 3. Desired network topology

Figure 3. The gateway is the end point of the network, and is connected to the control and monitoring system via hardwiring. Routers serve as relay points, gathering information from the field devices and passing it to the gateway.

 

Figure 4. Placement of individual field devices

Figure 4. Having an antenna mounted on the field device is common, but placement of the field device may put it in a location prone to interference. An external add-on antenna may be needed to improve communication.

Laying out a Network

Most networks are designed from two ends, the field and the control room. Field devices must be located according to their process function, which could easily be in a congested pipe jungle where equipment interferes with clear signal propagation. The final gateway is often placed near the control room, because it is hardwired to the control system. The network must bridge this gap.

Creating a sky mesh requires finding where it is practical to place routers. Ideally, these should be high off the ground and as close to the individual field devices as possible. Ensuring reliable communication between the field devices and the nearest sky mesh router may involve a secondary router in between to compensate for signal loss.

In most process plants, it is not difficult to find tall structures, such as distillation columns, but they may not be located where they are useful for router placement. Positioning antenna to avoid signal blockage problems associated with such large metallic structures can be tricky. As a rule of thumb, if the router is placed 30 m above the ground, it can reach individual field devices close to ground level up to 50 m away (figure 5). This assumes a few beneficial reflections, balanced against some obstructions from piping.

The connection from each field device to the closest router is the most challenging because it often has the most obstructions. Communication between routers and the gateway is easier to visualize and evaluate, since those components are mounted higher above the process equipment in more open space.

Figure 5. Routers in high positions

Figure 5. Routers in high positions can reach down to communicate with field devices closer to ground level. The practical area of coverage under favorable conditions is roughly a 90º to a 100º cone, with the router as the cone's apex.

Evaluating Performance

The two most common measures of network performance are bit error rate (BER) and packet error rate (PER). The former uses predetermined bit patterns to check which are received incorrectly, a process requiring dedicated software on all the field devices, routers, and gateways. It must be performed as a specific test, sending the designated patterns.

PER performance measurements, on the other hand, deal with complete packets and can be done without special tools during normal communication. If a problem is developing, there will be a detectable change in the PER.

The most important indicator is determining how often packets get through correctly the first time. Getting the PER as low as possible is the objective, but this can only be done when all radio links are working reliably.

A well-designed ISA-100.11a wireless instrumentation network can operate as dependably as wired I/O in most applications. When the communication links connect reliably, latency will be minimized, allowing control room operators and other plant personnel to have all the information they need in a timely manner.

 

媒体发布
Leverage Wireless Communication for Vibration Monitoring
(Leverage Wireless Communication for Vibration Monitoring)
横河技报
概述:

The introduction of wireless into industrial monitoring and control not only reduces wiring and maintenance costs but also expands its applications to include those which are impossible with wired systems, such as monitoring points which have to be given up due to the difficulty of the construction, and monitoring of points on rotating or frequently moved objects.

行业:
概述:

Yokogawa has been leading the process automation industries as one of the pioneers in field digital technologies represented by the FOUNDATION fieldbus™ and Field Device Tool/Device Type Manager (FDT/DTM).

宣传彩页
一般规格书
技术信息
认证信息

产品概述

参考视频

想要了解更多的信息,技术&解决方案?


联系我们
置顶
WeChat QR Code
横河电机(中国)有限公司
WeChat Recruiting QR Code
横河电机中国招聘