描述
2711PC-K4M20D8
随着现场总线技术的出现和成熟,促使了控制系统由集散控制系统(DCS)向现场总线控制系统(FCS)的过渡。在一般的FCS系统中,遵循一定现场总线协议的现场仪表可以组成控制回路,使控制站的部分控制功能下移分散到各个现场仪表中。从而减轻了控制站负担,使得控制站可以专职于执行复杂的高层次的控制算法。对于简单的控制应用,甚至可以把控制站取消,在控制站的位置代之以起连接现场总线作用的网桥和集线器,操作站直接与现场仪表相连,构成分布式控制系统。
分布式的FCS系统比DCS系统更好地体现了“信息集中,控制分散”的思想。与传统的DCS相比,FCS有其自身的特点。FCS系统具有高度的分散性,它可以由现场设备组成自治的控制回路。现场仪表或设备具有高度的智能化与功能自主性,可完成控制的基本功能,并可以随时诊断设备的运行情况。另外,FCS的结构比DCS简化。有的FCS系统省略了DCS中控制站这一层,操作站直接与现场仪表相连。这些使FCS的可靠性得到提高。
现场总线系统具有开放性。系统对相关标准具有一致性、公开性,强调对标准的共识与遵从。通信协议一致公开,各不同厂家的设备之间可实现信息交换,通过现场总线可构筑自动化领域的开放互连系统。系统的开放性决定了它具有互操作性和互用性。互操作性指互连设备间、系统间信息传送与沟通;而互用则意味着不同生产厂家的性能类似的设备可实现相互替换。作为工厂网络底层的现场总线还对现场环境有较强地适应性。它支持双绞线、同轴电缆、光缆、无线和电力线等,具有较强的抗干扰能力。
由于结构上的改变,FCS比DCS更节约硬件设备。使用FCS可以减少大量的隔离器、端子柜、I/O卡及I/O端口,这样就节省了I/O装置及装置室的空间;同时减少了大量电缆,可以极大地节省安装费用。与此同时,FCS比DCS性能有所提高。由于免去了D/A与A/D变换,使仪表精度得到极大的提高;通过将PID功能植入到相应的智能传感器中去,使控制周期大为缩短。目前FCS可以从DCS的每秒调节2~5次增加到每秒调节10~20次,改善了调节性能。FCS控制系统与DCS控制系统结构比较见
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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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FUJI SHARP VME BUS VISION CPU MODULE VM1110TA
FUJI SHARP VME BUS VISION CAMERA MODULE VM1710
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ASTEX TS90 0190-09246 WAVE GUIDE COUPLER REV. P3
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PERCEPTRON 911-0008 USPP 9110008
PERCEPTRON 911-0018 USPP 9110018
PERCEPTRON 9110017 USPP 9110017
PERCEPTRON 911-0011 USPP 9110011
PERCEPTRON 9110014 USPP 9110014
PERCEPTRON 912-0013 USPP 9120013
PERCEPTRON 911-0010 USPP 9110010
PERCEPTRON 912-0007 USPP 9120007
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PERCEPTRON 912-0011 USPP 9120011
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Perceptron Frame Grabber Board 495-0191 #29402
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PERCEPTRON 495-0092 USPP 4950092
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