RELANCE B/M-60031-2 可編程控制器
概述 可編程序控制器（Programmable Logic Controller，簡稱PLC）把自動化技術(shù)、計算機(jī)技術(shù)和通信技術(shù)融為一體，按照成熟而有效的繼電控制概念和設(shè)計思想，用先進(jìn)的微控制器技術(shù)來實現(xiàn)I/O的實時檢測和控制。由于PLC具有編程簡單、可靠性高、通用性強(qiáng)和使用方便等特點(diǎn)，因此得到廣泛應(yīng)用。 PLC是由早期繼電器邏輯控制系統(tǒng)與微機(jī)計算機(jī)技術(shù)相結(jié)合而發(fā)展起來的，它是以微處理器為主的一種工業(yè)控制儀表，它融計算機(jī)技術(shù)、控制技術(shù)和通信技術(shù)于一體，集順序控制、過程控制和數(shù)據(jù)處理于一身，可靠性高、功能強(qiáng)大、控制靈活、操作維護(hù)簡單。近幾年來，可編程序控制器及組成系統(tǒng)在我國冶金、電廠、輕工石化、礦業(yè)、水處理等行業(yè)更是到了廣泛的應(yīng)用，并取得了一定的經(jīng)濟(jì)效益。 在工業(yè)過程控制領(lǐng)域，每年對具有更高可靠性系統(tǒng)產(chǎn)品的需求都在逐年增加，其中絕大多數(shù)是受經(jīng)濟(jì)利益的驅(qū)動所產(chǎn)生的。工廠停機(jī)損失所帶來的代價是極其昂貴的，而且所造成的生產(chǎn)成本也會隨之增加。尤其在歐洲，一系列規(guī)章制度的主體正在逐步得到完善和加強(qiáng)?，F(xiàn)在公布的IEC 61508標(biāo)準(zhǔn)為過程控制系統(tǒng)的安全性能提供了設(shè)計依據(jù)，該標(biāo)準(zhǔn)主要針對可編程電子系統(tǒng)內(nèi)的功能性安全設(shè)計而制定的。 由于PLC應(yīng)用的廣泛性以及用戶對產(chǎn)品可靠性需求的不斷提高，開發(fā)低成本的、易用性強(qiáng)的PLC顯得特別具有意義。
上世紀(jì)70年代，由于經(jīng)濟(jì)的迅速發(fā)展，生產(chǎn)裝置迅速向大型化方向發(fā)展，尤其是石油煉制、冶金、化工、建材、電力等行業(yè)，這些行業(yè)生產(chǎn)裝置的大型化能夠帶來明顯的好處，如生產(chǎn)效率提高、原料消耗減少、勞動力成本降低等。生產(chǎn)設(shè)施的大型化要求設(shè)備之間具有更好的協(xié)調(diào)性，而且停機(jī)將帶來更大的損失。因此用戶迫切希望能夠有一種產(chǎn)品或者系統(tǒng)能夠解決生產(chǎn)設(shè)施大型化和連續(xù)化所面臨的控制問題。與此同時，在20世紀(jì)70年代中期，大規(guī)模集成電路取得突破性的發(fā)展，8位微處理器得到了廣泛的運(yùn)用，使自動化儀表工業(yè)發(fā)生巨大的變化，現(xiàn)代意義上的DCS也應(yīng)運(yùn)而生，1975年Honeywell推出了第一個DCS產(chǎn)品。 中國使用DCS始于1981年，當(dāng)時吉化公司化肥廠在合成氨裝置中引進(jìn)了Yokogawa的產(chǎn)品，表現(xiàn)出良好的控制性能和可靠性。隨后中國引進(jìn)的30套大化肥項目和大型煉油項目都采用了DCS控制系統(tǒng)，提高了生產(chǎn)設(shè)施的效率和產(chǎn)品質(zhì)量的連續(xù)性，并且物耗和能耗也有不同程度的降低。DCS產(chǎn)品在石油和化工行業(yè)的成功應(yīng)用也促進(jìn)了其他行業(yè)控制系統(tǒng)的發(fā)展，在隨后的幾年，冶金、建材、電力、輕工等行業(yè)的新建項目中也陸續(xù)使用了DCS產(chǎn)品，并成為這些行業(yè)的主流控制系統(tǒng)。
Pay attention to the situation where all operating stations are powered off
At this time, check if the power indicator light of the control station is normal, and if there is a fault in the card diagnosis indicator light. The red light and green light indicate that the card is working normally. If all of the above are normal, it can be determined that the control station is working normally and the self adjustment system is working normally. However, the operator cannot see the monitoring screen temporarily and cannot perform remote control operations on site. Immediately notify the microcomputer maintenance personnel to repair and go to the site for monitoring.
Pay attention to the situation where all control stations are powered off
Due to the dual power supply of all control station equipment, one UPS and one mains power supply, the probability of this situation occurring is very low.
When the control station is completely powered off, the two system alarm red lights on the monitoring screen light up, communication is interrupted, and all data is not refreshed. All self regulating systems are completely out of control, and the regulating valve will return to its initial state. The air opening valve will be fully closed, and the air closing valve will be fully open. At this time, emergency handling or parking should be carried out immediately, and the operation should be carried out on-site at the same time.
Here are our main products. If you need them, we can send them to help you compare the prices!
Main business: World brand PLC and DCS system spare parts modules
① Allen Bradley (USA AB) series products
② Schneider series products
③ General Electric series products
④ Westinghouse Series Products
⑤ SIEMENS (Siemens series products)
⑥ Selling ABB Robots FANUC Robots, YASKAWA Robots, KUKA Robots, Mitsubishi Robots, OTC Robots, Panasonic Robots, MOTOMAN Robots.
⑦ Westinghouse: OVATION system, WDPF system, MAX0 system spare parts.
⑧ Invensys Foxboro: I/A Series system, FBM (Field Input/Output Module) sequential control, trapezoidal logic control, accident memory processing, analog-to-digital conversion, input/output signal processing, data communication and processing, etc. Invensys Triconex: Redundant fault-tolerant control system, modern fault-tolerant controller based on Triple Modular Redundancy (TMR) structure.
⑨ Siemens: Siemens MOORE, Siemens Simatic C1, Siemens CNC system, etc.
⑩ Bosch Rexroth: Indramat, I/O modules, PLC controllers, drive modules, etc.
◆ Motorola: MVME 162, MVME 167, MVME1772, MVME177 and other series.
PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module, network communication module,
Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output module
Module, redundant module, power module, relay output module, relay input module, processor module.
Our advantage is: brand new original, with a one-year warranty! All products of our company have undergone strict testing. We welcome inquiries and acquisitions. As long as you have sincerity, our company will provide you with a price advantage over peers and work together to win the order.