品牌:ABB | 规格:AI845 3BSE023675R1 | 材质:AI845 3BSE023675R1 |
产地:瑞士 |
AI845 3BSE023675R1
AI845 3BSE023675R1
AI845 3BSE023675R1
来自于奥地利的贝加莱(B&R)工业自动化公司便是敏锐地捕捉到这一技术需求的变化,早在1994年便在第一个推出了基于定性实时多任务操作系统的可编程计算机控制器(PCC—ProgrammableComputerController),时至今日,仍然代表了这一创新技术的发展趋势,成为新一代自控工程师的新宠。我们知道,常规的PLC大多依赖于单任务的时钟扫描或监控程序,来处理程序本身的逻辑运算指令以及外部的I/O通道的状态采集与刷新,整个应用程序采用一个循环周期,但事实上在一个控制系统中,虽然往往有一些数据量是实时性要求很高的,但也有很多大惯性的模拟量是没有太高实时要求的,如果采用同样的刷新速度其实是对资源的浪费,而且循环顺序扫描的运行机制也直接导致了系统的控制速度严重依赖于应用程序的大小,应用程序一旦复杂庞大,控制速度就必然降低。这无疑是与I/O通道高实时性控制的要求相违背的。
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