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數(shù)字控制器接收來(lái)自傳感器的電子信號(hào)，將電子信號(hào)轉(zhuǎn)換為數(shù)字脈沖（值），并對(duì)這些值執(zhí)行數(shù)學(xué)運(yùn)算。控制器將輸出值重新轉(zhuǎn)換為信號(hào)，以操作執(zhí)行器?？刂破饕栽O(shè)定的時(shí)間間隔對(duì)數(shù)字?jǐn)?shù)據(jù)進(jìn)行采樣，而不是連續(xù)讀取數(shù)據(jù)。這種采樣方法稱為離散控制信號(hào)。如果正確選擇數(shù)字控制器的采樣間隔，離散輸出變化將提供均勻且不間斷的控制性能。圖20比較了模擬和數(shù)字控制信號(hào)。數(shù)字控制器根據(jù)一組測(cè)量的控制變量和一組給定的控制算法定期更新過(guò)程?？刂破魍瓿烧麄€(gè)計(jì)算，包括控制算法，并向執(zhí)行器發(fā)送信號(hào)。在許多較大的商業(yè)控制系統(tǒng)中，電子氣動(dòng)傳感器將電輸出轉(zhuǎn)換為可變壓力輸出，用于終控制元件的氣動(dòng)驅(qū)動(dòng)。
The digital controller receives electronic signals from sensors, converts the electronic signals to digital pulses (values), and performs mathematical operations on these values. The controller reconverts the output value to a signal to operate an actuator. The controller samples digital data at set time intervals, rather than reading it continually. The sampling method is called discrete control signaling. If the sampling interval for the digital controller is chosen properly, discrete output changes provide even and uninterrupted control performance. Figure 20 compares analog and digital control signals. The digital controller periodically updates the process as a function of a set of measured control variables and a given set of control algorithms. The controller works out the entire computation, including the control algorithm, and sends a signal to an actuator. In many of the larger commercial control systems, an electronic-pneumatic transducer converts the electric output to a variable pressure output for pneumatic actuation of the final control element.
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