RELANCE 61C22A I/O模塊/
DCS 系統(tǒng)的防干擾也要引起注意。對講機、手機信號對DCS 系統(tǒng)的干擾是毋庸置疑的, 區(qū)別在于功率的大小和距離的遠近, 雖然 火力發(fā)電廠分散控制系統(tǒng)技術規(guī)范書% 要求在距電子設備1- 2m以外發(fā)出的工作頻率達470 MHz、功率輸出達5W 的電磁干擾和射頻干擾, 應不影響系統(tǒng)正常工作。但一般不易確認干擾源功率, 同時為了確保絕 對安全, 仍要明文規(guī)定: 電子間全部范圍內不允許使用任何無線通訊工具, 靠近DCS 系統(tǒng)的空間內限制性使用大功率通訊工具。 制定合理的檢修周期, 配備合適的備品備件,安排適量的檢修人員等是控制系統(tǒng)穩(wěn)定運行的基本要求。這里著重提出的是, 對于任何廠家的任何版本DCS 控制系統(tǒng), 都要制定DCS 故障的緊急處理和停機停爐措施, 還有就是要解決 OVATION 系統(tǒng)計算機重啟后I/ 0 初始化的問題及機組的重要安全操作、保護要有直通性, 尤其是 OVATION 系 統(tǒng)中的鍋爐安全監(jiān)視保護子系統(tǒng)全部設計為軟邏輯。
上世紀70年代，由于經濟的迅速發(fā)展，生產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)生產裝置的大型化能夠帶來明顯的好處，如生產效率提高、原料消耗減少、勞動力成本降低等。生產設施的大型化要求設備之間具有更好的協(xié)調性，而且停機將帶來更大的損失。因此用戶迫切希望能夠有一種產品或者系統(tǒng)能夠解決生產設施大型化和連續(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也應運而生，1975年Honeywell推出了第一個DCS產品。 中國使用DCS始于1981年，當時吉化公司化肥廠在合成氨裝置中引進了Yokogawa的產品，表現(xiàn)出良好的控制性能和可靠性。隨后中國引進的30套大化肥項目和大型煉油項目都采用了DCS控制系統(tǒng)，提高了生產設施的效率和產品質量的連續(xù)性，并且物耗和能耗也有不同程度的降低。DCS產品在石油和化工行業(yè)的成功應用也促進了其他行業(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.
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