B&R 7TB718.91自1969年世界上诞生了第一台可编程逻辑控制器（PLC）以来，可编程控制技术在工业控制领域便一路高歌，取得了极为广泛的应用。但是在这过去的30多年里，计算机技术、电子技术、网络通信技术以及自动控制技术的飞速发展，使得工程师们在工业应用中对于控制器的功能需求也远远超越了当初的“顺序逻辑控制”的简单期望。

　　B&R 7TB718.91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年便在全球第一个推出了基于定性实时多任务操作系统(Real Time multi-tasking Operation System)的可编程计算机控制器（PCC—Programmable Computer Controller），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。

　　B&R 7TB718.91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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