描述
MS-NAE5510-2
由于现场总线的以上特点,特别是其系统结构的简化,使其从设计、安装、投运到正常生产运行及检修维护,都体现出优越性。它不仅节省了硬件数量与投资,节省了安装费用,而且系统的维护开销也大大地降低。现场总线控制系统不仅精确度与可靠性高,在方便使用和维护性方面,FCS也比DCS有优势。FCS使用统一的组态方式,安装、运行、维修简便;利用智能化现场仪表,使维修预报(Predicted maintenance)成为可能;由于系统具有互操作性和互用性,用户可以自由选择不同品牌的设备达到最佳的系统集成,在设备出现故障时,可以自由选择替换的设备,保障用户的高度系统集成主动权。此外,它还具有设计简单,易于重构等特点。传统的集散控制系统(DCS系统)具有集中监控、分散控制、操作方便的特点。但是,在实际应用中也发现DCS的结构存在一些不足之处,如控制不能做到彻底分散,危险仍然相对集中;由于系统的不开放性,不同厂家的产品不能互换、互联,限制了用户的选择范围。利用现场总线技术,开发FCS系统的目标是针对现存的DCS的某些不足,改进控制系统的结构,提高其性能和通用性。
FCS想要在实际中取代DCS,既要具备DCS所具有的功能,又要能克服DCS的缺点。FCS由于采用了现场总线技术,在开放性、控制分散等方面优于传统DCS。但是由于它是一种新技术,目前连标准本身都还没有制定统一,因此FCS与成熟的DCS相比,还存在下列的一些欠缺。
(1)由于现场总线标准本身尚在发展中,从而给产品的开发和测试带来难度。这在一定程度上造成产品开发商、生产商少,产品品种单一而且价格昂贵。
(2)在某些场合中,FCS还无法提供DCS已有的控制功能。由于软硬件水平的限制,其功能块的功能还不是很强,品种也不够齐全;用现场仪表还只能组成一般的控制回路如单回路、串级、比例控制等,对于复杂的、先进的控制算法还无法在仪表中实现,对于单回路内有多输入、多输出的情况缺乏好的解决方案。
(3)目前FCS成功的应用实例不多,难以评估实际应用效果。由于以上这些原因,FCS取代DCS将是一个逐渐的过程。在这一过程中,会出现一些过渡型的系统结构,如在DCS中以FCS取代DCS中的某些子系统。用户将现场总线设备连接到独立的现场总线网络服务器,服务器配有DCS中连接操作站的上层网络接口,与操作站直接通信。在DCS的软件系统中可增添相应的通信与管理软件。这样不需要对原有控制系统作结构上的重大变动。
产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
保 证售后服务质量,
优势价格,大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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专业销售进口DCS PLC系统备件模块
PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗
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