描述
闭环控制器、模拟量数据采集器和逻辑运算器可以和人机界面直接连在通讯网络上，在网络上的每一个不同的控制器作为网络上的一个独立结点。每一个结点完成不同的功能。它们都应有网络接口。有的DCS为了节省网络接口，把所有的过程控制用的设备即闭环控制器、模拟量数据采集器和逻辑运算器预先连在控制总线上，称为过程控制站。这可以增加过程控制站能接收的I/O点数，又能节省接口。然后再通过接口连到网络上，与人机界面相连。随着计算机计术的发展，控制器的运算能力不断增强，如PC机做的一个控制器能力很强，既可接收模拟量运算，也接收开关量逻辑运算。一个控制器成为网络上的一个结点。通过网络与人机界面相连
控制器是DCS的核心部件，它相当于一台PC机。有的DCS的控制器本身就是PC机。它主要有CPU、RAM、E2PROM和ROM等芯片，还有两个接口，一个向下接收I/O总线来的信号，另一个接口是向上把信号送到网络上与人机界面相连。ROM用来存贮完成各种运算功能的控制算法（有的DCS称为功能块库）。在库中存功能块，如控制算法PID、带死区PID，积分分离PID，算术运算加、减、乘、除、平方、开方、函数运算一次滤波、正弦、余弦、X-Y函数发生器、超前-滞后；比较先进的算法有史密斯预估，C语言接口、矩阵加、矩阵乘；逻辑运算有逻辑与、逻辑或、逻辑非、逻辑与非等。通常用站功能块不仅把模拟量和开关量结合起来，还与人连系起来。功能块越多，用户编写应用程序（即组态）越方便。组态按照工艺要求，把功能块连接起来形成控制方案。把控制方案存在E2PROM中。因为E2PROM可以擦写，组态要随工艺改变而改变，所以把组态存在E2PROM中。不同用户有不同组态。组态时，用户从功能块库中选择要的功能块，填上参数，把功能块连接起来。形成控制方案存到E2PROM中。这时控制器在组态方式，投入运行后就成为运行方式。
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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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