描述
閉環(huán)控制器、模擬量數(shù)據(jù)采集器和邏輯運算器可以和人機界面直接連在通訊網(wǎng)絡(luò)上，在網(wǎng)絡(luò)上的每一個不同的控制器作為網(wǎng)絡(luò)上的一個獨立結(jié)點。每一個結(jié)點完成不同的功能。它們都應(yīng)有網(wǎng)絡(luò)接口。有的DCS為了節(jié)省網(wǎng)絡(luò)接口，把所有的過程控制用的設(shè)備即閉環(huán)控制器、模擬量數(shù)據(jù)采集器和邏輯運算器預(yù)先連在控制總線上，稱為過程控制站。這可以增加過程控制站能接收的I/O點數(shù)，又能節(jié)省接口。然后再通過接口連到網(wǎng)絡(luò)上，與人機界面相連。隨著計算機計術(shù)的發(fā)展，控制器的運算能力不斷增強，如PC機做的一個控制器能力很強，既可接收模擬量運算，也接收開關(guān)量邏輯運算。一個控制器成為網(wǎng)絡(luò)上的一個結(jié)點。通過網(wǎng)絡(luò)與人機界面相連
控制器是DCS的核心部件，它相當(dāng)于一臺PC機。有的DCS的控制器本身就是PC機。它主要有CPU、RAM、E2PROM和ROM等芯片，還有兩個接口，一個向下接收I/O總線來的信號，另一個接口是向上把信號送到網(wǎng)絡(luò)上與人機界面相連。ROM用來存貯完成各種運算功能的控制算法（有的DCS稱為功能塊庫）。在庫中存功能塊，如控制算法PID、帶死區(qū)PID，積分分離PID，算術(shù)運算加、減、乘、除、平方、開方、函數(shù)運算一次濾波、正弦、余弦、X-Y函數(shù)發(fā)生器、超前-滯后；比較先進的算法有史密斯預(yù)估，C語言接口、矩陣加、矩陣乘；邏輯運算有邏輯與、邏輯或、邏輯非、邏輯與非等。通常用站功能塊不僅把模擬量和開關(guān)量結(jié)合起來，還與人連系起來。功能塊越多，用戶編寫應(yīng)用程序（即組態(tài)）越方便。組態(tài)按照工藝要求，把功能塊連接起來形成控制方案。把控制方案存在E2PROM中。因為E2PROM可以擦寫，組態(tài)要隨工藝改變而改變，所以把組態(tài)存在E2PROM中。不同用戶有不同組態(tài)。組態(tài)時，用戶從功能塊庫中選擇要的功能塊，填上參數(shù)，把功能塊連接起來。形成控制方案存到E2PROM中。這時控制器在組態(tài)方式，投入運行后就成為運行方式。
產(chǎn)品承諾：
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主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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