描述
PLC的PID運(yùn)算調(diào)節(jié)通過(guò)該型處理器專用PID指令完成,通過(guò)設(shè)置各參數(shù)即可由PLC完成PID運(yùn)算調(diào)節(jié)。PID程序段流程如圖4。PID指令必須以相同的時(shí)間間隔周期性地執(zhí)行,可采用計(jì)時(shí)器,定時(shí)中斷或?qū)崟r(shí)采樣的等方法,此處選用了定時(shí)方法;PV是PID指令采樣的壓力控制反饋值,SP是PID指令的壓力控制設(shè)定值,KP為PID的比例增益,KI為PID的積分增益,KD為PID的微分增益,這五個(gè)控制參數(shù)作為主要的PID參數(shù)參與控制,確定PID參數(shù)時(shí)要兼顧系統(tǒng)靈敏性和穩(wěn)定性,由于我們恒壓控制要求和設(shè)備的性能條件,參數(shù)設(shè)定更強(qiáng)調(diào)穩(wěn)定性(及KI),由于微分環(huán)節(jié)有放大噪聲的特點(diǎn),我們將KD盡量設(shè)置得較??;SWM為PID指令轉(zhuǎn)為手動(dòng)直接調(diào)頻的開關(guān),SO設(shè)定為PID指令的在手動(dòng)控制輸出方式時(shí)的輸出值,當(dāng)變頻器從PID自控調(diào)節(jié)轉(zhuǎn)為手動(dòng)直接調(diào)頻時(shí),SO替代PID運(yùn)算結(jié)果作為轉(zhuǎn)換時(shí)的輸出值,將SO設(shè)定為控制值就可實(shí)現(xiàn)無(wú)縫轉(zhuǎn)換,減小變頻器運(yùn)行頻率的震蕩。DB為PID指令的死區(qū)設(shè)定值,輸出超出死區(qū)時(shí)PID指令通過(guò)自動(dòng)運(yùn)算限制輸出超出限定范圍。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
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◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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