Bosch 0-001-510-035現(xiàn)貨
你只看到我賣進(jìn)口備件,卻沒看到我也再賣國產(chǎn)配件。
你有你的優(yōu)勢,我有我的品質(zhì)。
你否定我的現(xiàn)在,我決定我的未來。
你嘲笑我的高價(jià)格,我可憐你沒那資格。。
夢想,是注定孤獨(dú)的旅行,路上少不了質(zhì)疑和嘲笑
。
但,那又怎樣?哪怕遍體鱗傷,也要活得漂亮。
分布式控制系統(tǒng)(DCS)進(jìn)入21世紀(jì),在通信和信息管理技術(shù)、集成電路技術(shù)的進(jìn)步以及工藝設(shè)備大型化的影響下,在節(jié)能環(huán)保和提高生產(chǎn)效率的需求下,形成了新一代的DCS,或稱為第四代DCS。
經(jīng)過近20年來的發(fā)展,國內(nèi)在原來DDC直接數(shù)字控制技術(shù)自行研發(fā)和工控機(jī)應(yīng)用的基礎(chǔ)上,在對國外DCS的工程應(yīng)用及技術(shù)引進(jìn)的基礎(chǔ)上,逐漸形成了獨(dú)立自主的DCS產(chǎn)業(yè),特別是在大型火力發(fā)電廠中的應(yīng)用國產(chǎn)DCS已取得了可喜的業(yè)績,已經(jīng)達(dá)到或接近國際先進(jìn)水平。 與國外DCS相比,國內(nèi)DCS產(chǎn)業(yè)具有如下特色和應(yīng)用優(yōu)勢:
■反映水平的技術(shù)指標(biāo)具體是指網(wǎng)絡(luò)結(jié)構(gòu)、硬件體系、軟件體系及系統(tǒng)容量、系統(tǒng)實(shí)時(shí)性、系統(tǒng)人機(jī)界面、系統(tǒng)現(xiàn)場借口、系統(tǒng)控制功能、系統(tǒng)較精確度、系統(tǒng)靈活性和可擴(kuò)展性、系統(tǒng)可靠性、可用性、可維護(hù)性、系統(tǒng)穩(wěn)定性和系統(tǒng)安全性等。如何進(jìn)一步科學(xué)地評比這些指標(biāo),是當(dāng)今制造業(yè)的任務(wù)。
主營產(chǎn)品:Schneider ,Foxboro,Ovatin,Allen-Bradley,Siemens等各類工控產(chǎn)品,
歡迎來電咨詢!
7. 生成OB1
OB1決定用戶程序的結(jié)構(gòu),也包含要傳送給各個(gè)功能的參數(shù)。例如:
(1) 為進(jìn)料泵和攪拌電機(jī)而編制的STL段中為電機(jī)FB提供啟動(dòng)( “Start”)、停止(“Stop”),響應(yīng)(“Response”)以及復(fù)位維護(hù)顯示(“Reset_Maint”)的輸入?yún)?shù)。PLC的每一個(gè)循環(huán)周期都會處理這個(gè)電機(jī)的FB。
(2) 如果電機(jī)的FB被處理,則輸入Timer_No和Response_Time指示所使用的定時(shí)器功能以及要測量的時(shí)間。
(3) 因?yàn)殚y門的FC和電機(jī)的FB是在OB1中調(diào)用的,所以它們在每個(gè)程序循環(huán)都會被可編程序控制器處理。程序?yàn)樘幚磉M(jìn)料泵和攪拌電機(jī)的控制任務(wù),使用電機(jī)的FB時(shí)分別配備了不同的背景DB。
Network 1 進(jìn)料泵A的互鎖
A “EMER_ STOP_off”
A “Tank_ below_max”
AN “Drain”
= #Enable_Motor
Network 2 為配料A調(diào)用電機(jī)的FB
A “Feed_pump_A_Start”
A #Enable_Motor
= #Start_Fulfilled
A(
O “Feed_Pump_A_Stop”
ON #Enable_Motor
)
= #Stop_Fulfilled
CALL “Motor_block”, “DB_feed_pump_A”
Start :=Start Fulfilled
Stop :=Stop_Fulfilled
Response :=“Flow_ A”
Reset_ Maint :=“Reset_maint”
ALFA LAVAL SERVO DRIVE 31830-3350-1
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Bosch 0-001-510-035