工業(yè)可編程序控制器(PLC)發(fā)展趨勢(shì)
PLC作為工控機(jī)的一員,在主要工業(yè)國家中成為自動(dòng)化系統(tǒng)的基本電控裝置。它具有控制方便、可靠性高、容易掌握、體積小、價(jià)格適宜等特點(diǎn)。據(jù)統(tǒng)計(jì),當(dāng)今世界PLC生產(chǎn)廠家約150家,生產(chǎn)300多個(gè)品種。2000年銷售額約為86億美元,占工控機(jī)市場(chǎng)份額的50%,PLC將在工控機(jī)市場(chǎng)中占有主要地位,并保持繼續(xù)上升的勢(shì)頭。
PLC在60年代末引入我國時(shí),只用作離散量的控制,其功能只是將操作接到離散量輸出的接觸器等,最早只能完成以繼電器梯形邏輯的操作。新一代的PLC具有PID調(diào)節(jié)功能,它的應(yīng)用已從開關(guān)量控制擴(kuò)大到模擬量控制領(lǐng)域,廣泛地應(yīng)用于航天、冶金、輕工、建材等行業(yè)。
PLC的I/O響應(yīng)時(shí)間
為了增強(qiáng)PLC的抗干擾能力,提高其可靠性,PLC的每個(gè)開關(guān)量輸入端都采用光電隔離等技術(shù)。
為了能實(shí)現(xiàn)繼電器控制線路的硬邏輯并行控制,PLC采用了不同于一般微型計(jì)算機(jī)的運(yùn)行方式(掃描技術(shù))。
以上兩個(gè)主要原因,使得PLC的I/O響應(yīng)比一般微型計(jì)算機(jī)構(gòu)成的工業(yè)控制系統(tǒng)慢得多,其響應(yīng)時(shí)間至少等于一個(gè)掃描周期,一般均大于一個(gè)掃描周期甚至更長。
所謂I/O響應(yīng)時(shí)間指從PLC的某一輸入信號(hào)變化開始到系統(tǒng)有關(guān)輸出端信號(hào)的改變所需的時(shí)間。
可編程控制器(Programmable Controller)是計(jì)算機(jī)家族中的一員,是為工業(yè)控制應(yīng)用而設(shè)計(jì)制造的。早期的可編程控制器稱作可編程邏輯控制器(Programmable Logic Controller),簡(jiǎn)稱PLC,它主要用來代替繼電器實(shí)現(xiàn)邏輯控制。隨著技術(shù)的發(fā)展,這種裝置的功能已經(jīng)大大超過了邏輯控制的范圍,因此,今天這種裝置稱作可編程控制器,簡(jiǎn)稱PC。但是為了避免與個(gè)人計(jì)算機(jī)(Personal Computer)的簡(jiǎn)稱混淆,所以將可編程控制器簡(jiǎn)稱PLC。
Adv. Part Number Debion
P0997LA Adv Cluster to 200/Mesh Comp TA FBM237-P0917QZ
P0997LB Adv Cluster to 200/Mesh Comp TA FBM242-P0917XX
P0997LC Adv Cluster to 200/Mesh Comp TA FBM242-P0926BE
P0997LD Adv Cluster to 200/Mesh Comp TA, FBM242-P0916JY
P0997LE Adv Cluster to 200/Mesh Comp TA, FBM242-P0917HX
P0997LF Adv Cluster to 200/Mesh Comp TA FBM201-P0916AA
P0997LG Adv Cluster to 200/Mesh Comp TA FBM205/208-P0916AJ
P0997LH Adv Cluster to 200/Mesh Comp TA FBM207-P0916PH
P0997LJ Adv Cluster to 200/Mesh Comp TA FBM211-P0916JT
P0997LK Adv Cluster to 200/Mesh Comp TA FBM211-P0916BT
P0997LL Adv Cluster to 200/Mesh Comp TA FBM212-P0916BV
P0997LM Adv Cluster to 200/Mesh Comp TA FBM237-P0916CC
P0997LN Adv Cluster to 200/Mesh Comp TA FBM242-P0916NG
P0997LP Adv Cluster to 200/Mesh Comp TA FBM242-P0916JZ
P0997LQ Adv Cluster to 200/Mesh Comp TAFBM207P0916PK
P0997LR Adv Cluster to 200/Mesh Comp TA FBM207-P0916PM
P0997LS Adv Cluster to 200/Mesh Comp TA FBM217-P0916PY
P0997LT Adv Cluster to 200/Mesh Comp TA FBM217-P0916PS
P0997LU Adv Cluster to 200/Mesh Comp TA FBM217-P0916CA
P0997LV Adv Cluster to 200/Mesh Comp TA, FBM217-P0916QA
P0997LW Adv Cluster to 200/Mesh Comp TA FBM217-P0916PU
P0997LX Adv Cluster to 200/Mesh Comp TA, FBM217-P0916PW
P0997LY Adv Cluster to 200/Mesh FBM201 Isol 0-20Ma-P0914SQ
P0997LZ Adv Cluster to 200/Mesh FBM201D Isol 0-10V-P0922YK
P0997MA Adv Cluster to 200/Mesh FBM205 Red 0-20-P0914XG
P0997MB Adv Cluster to 200/Mesh FBM207 Isol 16 DIN-P0914TD
P0997MC Adv Cluster to 200/Mesh FBM211 Diff 0-20mA-P0914TN
P0997MD Adv Cluster to 200/Mesh FBM212 Diff TC/mV-P0914XL
P0997ME Adv Cluster to 200/Mesh FBM217 Dcrt32 Chan-P0914TR
P0997MF Adv Cluster to 200/Mesh FBM237 Isol 0-20mA-P0914XS
P0997MG Adv Cluster to 200/Mesh FBM240 8 RedChan-P0917GZ
P0997MH Adv Cluster to 200/Mesh FBM242 Isol Ext DO-P0916TA
P0997MJ Adv Cluster to 200/Mesh FBM2xx Type1 Cable-P0916DB
P0997MK Adv Cluster to 200/Mesh FBM2xx Type4 Cable-P0916FH
P0997MM Adv Cluster to 200/Mesh Red Adp FBM205/208-P0916NN
P0997MN Adv Cluster to 200/Mesh Red Adp FBM218/237-P0916QD
P0997MP Adv Cluster to 200/Mesh Red Adp For FBM240-P0917YJ
P0997MQ Adv Cluster to 200/Mesh TA FBM240 80V-10A-P0917YF
P0997MR Adv Cluster to 200/Mesh TA FBM240 80V-5A-P0917HU
P0997MS FMB201 Adv 100 to 200 on Mesh - P0914SQ
P0997MT FBM203 Adv 100 to 200 on Mesh - P0914SV
P0997MU FBM204 Adv 100 to 200 on Mesh - P0914SY
P0997MV FBM208 Red Adv 100 to 200 on Mesh - P0914TB
P0997MX FBM207 Adv 100 to 200 on Mesh - P0914TD
P0997MY FBM241 Adv 100 to 200 on Mesh - P0914TG
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柳州鋼鐵(集團(tuán))公司
衢州元立金屬制品有限公司
廣西柳州鋼鐵集團(tuán)公司
馬鞍山鋼鐵股份有限公司
土耳其ICDAS
重慶鋼鐵股份有限公司
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