功率部件6SN12272ED100HA0參詳
功率部件6SN12272ED100HA0參詳
功率部件6SN12272ED100HA0參詳
C98043-A7090-L1
A5E00357869
3BHB036781R0001 1
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型號(hào):PS416-CPU-200
8B0M0120HW00.000-1 1
3BHB036781R0001 1
GRVSW-660FA 2個(gè)
GRVSW-663FA 1個(gè)
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5X00121G01 艾默生 1只
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EVF9335-EVV300 1pcs
6FC5210-0DA20-2AA1 2
施耐德 伺服電機(jī) ISH070/60017/0/1/00/0/00/10/00
2094-BC07-M05-S 面價(jià)90436 1臺(tái)
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MODICON TSX-P57-6634M TSXP576634M
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MITSUBISHI K3N-CPU-P2H K3NCPUP2H
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MARPOSS 3708630010 3708630010
MAGNETEK GPD503-CIMR-G3U2022 GPD503CIMRG3U202
LORAIN PRODUCTS ES371AMB ES371AMB
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LAETUS 2D-COSI-820-1421 2DCOSI8201421
KOLLMORGEN IND 600 600
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ITE SIEMENS WMC164 WMC164
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HPM 1D703-0031 1D7030031
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GETTYS 110-114 110114
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BAILEY CONTROLS YPC-111A YPC111A
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功能模塊獨(dú)立的概念是功能模塊化、抽象、信息隱蔽和局部化概念的直接結(jié)果。
抽象是指對(duì)事物、狀態(tài)或過(guò)程之間所存在的某些相似的方面集中和概括起來(lái),而暫時(shí)忽略他們之間的差異,即考慮抽象事物的本質(zhì)特征而暫時(shí)不考慮他們的細(xì)節(jié)。信息隱蔽是指再設(shè)計(jì)功能模塊時(shí)使得一個(gè)功能模塊內(nèi)所包含的信息(過(guò)程或數(shù)據(jù)),對(duì)于不需要這些信息的功能模塊來(lái)說(shuō)是不能訪問(wèn)的。信息隱蔽原則對(duì)于以后在軟件維護(hù)期間修改軟件時(shí)會(huì)帶來(lái)極·的好處,因?yàn)榇罅繑?shù)據(jù)和過(guò)程是軟件的其他部分所不能覺(jué)察的,因而再對(duì)某個(gè)功能模塊修改時(shí)就不大會(huì)影響到軟件的其他部分,所謂局部化是指把一些關(guān)系密切的軟件元素在物理位置上彼此靠近。
功能模塊獨(dú)立性是通過(guò)制定具有單一功能并且和其他功能模塊沒(méi)有過(guò)多聯(lián)系的功能模塊來(lái)實(shí)現(xiàn)的。每個(gè)功能模塊只涉及該軟件要求的一個(gè)具體子功能,而且與軟件結(jié)構(gòu)的其他部分的接口是簡(jiǎn)單的。
功能模塊獨(dú)立性好的軟件接口簡(jiǎn)單,易于編制,獨(dú)立的功能模塊也比較容易測(cè)試和維護(hù),限制了功能模塊之間由于聯(lián)系緊密而引起的修改副作用。獨(dú)立性是保證軟件質(zhì)量的重要因素。