詳細參數(shù) | |||
---|---|---|---|
品牌 | 伍德沃德 | 型號 | 5466-031 |
結構形式 | 模塊式 | 安裝方式 | 控制室安裝 |
LD指令處理器 | 硬PLC | 加工定制 | 否 |
伍德沃德 5466-031 網(wǎng)絡控制器模塊
一、I/O模塊
PLC與電氣回路的接口,是通過輸入輸出部分(I/O)完成的。I/O模塊集成了PLC的I/O電路,其輸入暫存器反映輸入信號狀態(tài),輸出點反映輸出鎖存器狀態(tài)。輸入模塊將電信號變換成數(shù)字信號進入PLC系統(tǒng),輸出模塊相反。I/O分為開關量輸入(DI),開關量輸出(DO),模擬量輸入(AI),模擬量輸出(AO)等模塊。
開關量是指只有開和關(或1和0)兩種狀態(tài)的信號,模擬量是指連續(xù)變化的量。常用的I/O分類如下:
開關量:按電壓水平分,有220VAC、110VAC、24VDC,按隔離方式分,有繼電器隔離和晶體管隔離。
模擬量:按信號類型分,有電流型(4-20mA,0-20mA)、電壓型(0-10V,0-5V,-10-10V)等,按精度分,有12bit,14bit,16bit等。
除了上述通用IO外,還有特殊IO模塊,如熱電阻、熱電偶、脈沖等模塊。
按I/O點數(shù)確定模塊規(guī)格及數(shù)量,I/O模塊可多可少,但其數(shù)受CPU所能管理的基本配置的能力,即受的底板或機架槽數(shù)限制。
二、電源模塊
PLC電源用于為PLC各模塊的集成電路提供工作電源。同時,有的還為輸入電路提供24V的工作電源。電源輸入類型有:交流電源(220VAC或110VAC),直流電源(常用的為24VAC)。
三、底板或機架
大多數(shù)模塊式PLC使用底板或機架,其作用是:電氣上,實現(xiàn)各模塊間的聯(lián)系,使CPU能訪問底板上的所有模塊,機械上,實現(xiàn)各模塊間的連接,使各模塊構成一個整體。
Specifically, adaptive control is a set of techniques that allow the value of the control beters to be adjusted in real-time, allowing good monitoring of the controlled variables even if the plant beters are unknown or change over time.
This control is a special type of non-linear control, and the process can be separated into two-time scales: fast time (feedback loop) and slow-time (variation of the control beters, which affects the automatisms).
Adaptive control and its applications in industry – Structure of Adaptive Control
Conventional controllers are designed to adjust linear and time-invariant (LTI) systems. This approximation is true for fixed points of operation with small disturbances.
When this approximation is no longer true, the perbance of conventional controllers is no longer good. Adaptive control, on the other hand, is capable of adapting by changing its control beters, maintaining and continuation of good control of the process.
Adaptive control is a b in which the response of a controller changes automatically based on changes in conditions within the process.
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