3HAC025841-006
3HAC025841-006
3HAC025841-006
3HAC025841-006
單片機本來抗干擾能力較低，從現(xiàn)在所要求的I/O總數(shù)來看，不
論是MCS51系列還是MCS96系列單片機，都必須進行大規(guī)模的擴展，這樣系統(tǒng)電路更加復雜，進一步降低了系統(tǒng)的可靠性。
· 開發(fā)成本高
單片機的售價并不貴，以目前市場價，較有名氣的ATMEL也不
過十幾元錢一片而已，但簡單從這表面上看這個問題是不妥的，以本人幾年來單片機開發(fā)經驗可知，要購入單片機開發(fā)裝置（如仿真器、燒錄器、電源）和還要開模制版等，這都是一筆不小的費用。加上開發(fā)周期長所投入的人力物力，其價錢已遠遠地超過應用PLC開發(fā)的費用。
另外由于設備是專用特殊設備，其控制系統(tǒng)專用性較強，通用性較差，為其投入過多的開發(fā)費用不值得。
· 開發(fā)周期更長
單片機的開發(fā)周期較長，從電路設計、開模制版、編程、仿真、調
試等經歷非常長的周期，工程師往往要花大部分的時間在硬件設計和編程調試處理上，對最為重要的工藝過程往往沒有更多的時間考慮。
· 不便于修改和維護
利用單片機開發(fā)的設備往往是專用的特殊設備，在市場上往往不能
找到可替代的備件，所以不便于維護，這是用戶最不愿看到的。
基于以上（不限于）的原因，本人認為此方案不適用
2 工控機（IPC）控制
無疑，從可靠性來說，IPC要比單片機要好得多，但其價格昂貴，
不計其整機價格，單就要滿足I/O點數(shù)據的板卡量（32通道，約10塊）費用就不少，其價格要遠遠高于采用PLC控制的價格。
更為重要的是工控機更新?lián)Q代較快，不但硬件如此，而且最根本的操作系統(tǒng)也不斷地更新?lián)Q代，換句話說，如果設備控制系統(tǒng)出現(xiàn)故障，更換硬件，可能意味著更新操作系統(tǒng)，進而導致整個系統(tǒng)的應用軟件（包括界面）都要重新設計（或開發(fā)），這對太多數(shù)用戶來說是不能接受的。
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DAY AND NIGHT PHN342000L00A1 3.5T ROOFTOP AIR CONDITIO全國低價,歡迎來電!
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CARRIER 50TJ-006-611BF 5 Ton ROOFTOP AIR CONDITIONER全國低價,歡迎來電!
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