RELANCE 57C330 遠程I/O網(wǎng)絡(luò)
電源故障改從哪些方面分析?
電源問題
電源問題分為電源連線問題和電源質(zhì)量問題。
電源連線問題
包括：沒有連線(火、地、零幾項中，其中一項沒接);錯誤連線(火線與零線反接，地線與零線反接，地線與零線多點短接)。
電源質(zhì)量問題
包括：設(shè)備連線質(zhì)量(各連接頭松動);技術(shù)指標(電壓、頻率等)超過規(guī)定要求。
線質(zhì)量問題
包括：電源線線阻抗增大和絕緣層不好。
地極問題
包括：地極電阻增大，地極同地網(wǎng)斷開。
環(huán)境問題
包括：電源線特別是地線布線不合理，同產(chǎn)生強磁場干擾的電線和設(shè)備相隔太近。
發(fā)展方向
DCS發(fā)展至今已相當成熟和實用，毫無疑問，它仍是當前工業(yè)自動化系統(tǒng)應(yīng)用及選型的主流，不會隨著現(xiàn)場總線技術(shù)的出現(xiàn)而立即退出現(xiàn)場過程控制的舞臺。面對挑戰(zhàn)，DCS將沿著以下趨勢繼續(xù)向前發(fā)展：
(1)向綜合化方向發(fā)展：標準化數(shù)據(jù)通信鏈路和通信網(wǎng)絡(luò)的發(fā)展，將各種單(多)回路調(diào)節(jié)器、PLC、工業(yè)PC、NC等工控設(shè)備構(gòu)成大系統(tǒng)，以滿足工廠自動化要求，并適應(yīng)開放式的大趨勢。
(2)0-57170 向智能化方向發(fā)展：數(shù)據(jù)庫系統(tǒng)、推理機能等的發(fā)展，尤其是知識庫系統(tǒng)(KBS)和專家系統(tǒng)(ES)的應(yīng)用，如自學(xué)習(xí)控制、遠距離診斷、自尋優(yōu)等，人工智能會在DCS各級實現(xiàn)。與FF現(xiàn)場總線類似，以微處理器為基礎(chǔ)的智能設(shè)備如智能I/O、PID控制器、傳感器、變送器、執(zhí)行器、人機接口、PLC相繼出現(xiàn)。
Poor interoperability. Although analog instruments have unified 4-20mA signal standards, most technical parameters are still determined by manufacturers, resulting in the inability to exchange instruments of different brands. Therefore, it leads to users relying on manufacturers, unable to use the most cost-effective supporting instruments, and even a situation where individual manufacturers monopolize the market.
DCS industrial PCization: The composition of DCS by IPC has become a major trend, and PC has become a common operating station or node machine for DCS. PC-PLC, PC-STD, PC-NC, etc. are pioneers of PC-DCS, and IPC has become the hardware platform for DCS.
DCS specialization: In order for DCS to be more suitable for applications in various corresponding fields, it is necessary to further understand the process and application requirements of the corresponding profession, in order to gradually form DCS such as nuclear power DCS, substation DCS, glass DCS, cement DCS, etc.
Development towards comprehensiveness: The development of standardized data communication links and communication networks, combining various single (multi) loop regulators, PLCs, industrial PCs, NC and other industrial control equipment into a large system to meet the requirements of factory automation and adapt to the trend of openness.
Developing towards intelligence: The development of database systems, inference capabilities, and more, especially the application of knowledge base systems (KBS) and expert systems (ES), such as self-learning control, remote diagnosis, and self optimization, will be achieved through artificial intelligence at all levels of DCS. Similar to FF fieldbus, intelligent devices based on microprocessors such as intelligent I/O, PID controllers, sensors, transmitters, actuators, human-machine interfaces, and PLCs have emerged one after another.