西门子6FC5411-0AA00-0AA0参详
西门子6FC5411-0AA00-0AA0参详
西门子6FC5411-0AA00-0AA0参详
西门子6FC5411-0AA00-0AA0说明书
西门子6FC5411-0AA00-0AA0工作原理
功能模块独立的概念是功能模块化、抽象、信息隐蔽和局部化概念的直接结果。
抽象是指对事物、状态或过程之间所存在的某些相似的方面集中和概括起来,而暂时忽略他们之间的差异,即考虑抽象事物的本质特征而暂时不考虑他们的细节。信息隐蔽是指再设计功能模块时使得一个功能模块内所包含的信息(过程或数据),对于不需要这些信息的功能模块来说是不能访问的。信息隐蔽原则对于以后在软件维护期间修改软件时会带来极·的好处,因为大量数据和过程是软件的其他部分所不能觉察的,因而再对某个功能模块修改时就不大会影响到软件的其他部分,所谓局部化是指把一些关系密切的软件元素在物理位置上彼此靠近。
功能模块独立性是通过制定具有单一功能并且和其他功能模块没有过多联系的功能模块来实现的。每个功能模块只涉及该软件要求的一个具体子功能,而且与软件结构的其他部分的接口是简单的。
功能模块独立性好的软件接口简单,易于编制,独立的功能模块也比较容易测试和维护,限制了功能模块之间由于联系紧密而引起的修改副作用。独立性是保证软件质量的重要因素。
6DD1661-0AD0
6ES7414-3EM07-0AB0
BMEP581020
ACS800-04M-0260-3
UNITROL 1020-0006 FULL
3BHE030579R0006
6SL3130-7TE25-5AA3
MPF-A430P-MJ74BA
T7D10003P1XFCCUAL MCCB 1000A 20KA
T5S400 3P PR221
3AUA0000103636 T5S400 3P PR221
HW9482451-A 1
UNITROL 1020-0006 FULL
3BHE030579R0006 1台-----
3BHE030579R0003--------
GA50B4012ABBA 12-------
CIPR-GA50B4012ABBA
6SL3000-0CE21-0AA0 1
A03B-0819-J051 1-------
6ES7315-2FJ14-0AB0 1 ------
6SL3130-6AE21-0AB1 1
MPL-B4560F-MJ72AA 26076
MPF-A430P-MJ74BA 31124
施耐德 PNET1GB 400
6DD1661-0AD0数量4------
ACS880-07-0721A-7+A004+F250+G300+G313+G307+K454+L500+L502+Q951 1
电源模块A5E01341031-CV3-AC 数量:1
1794-OE8H 1 19面价19024
1794-OF8IH 1 19面价17748
1794-TB3S 1 面价无
25A-D-010-N-1-1-4 5 面价6209
25A-D010N114
A660-2006-T341#L4R503 5
A660-4004-T260 5
RM22TU23 1
193-EC1CB 面价7914 2
2711P-B4C5D8 面价10801 1
193-EC1BB 19年面价 面价7099 1
BME581020 1
BMEP581020
PVDM2-32 32-CHANNEL PACKET VOICE/FAX DSP MODULE
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PSC Falcon 4220 Windows CE .NET PDA
PRP-1 CISCO 12000 SERIES PERFORMANCE ROUTE PROCESSOR 1YR - ASK 4 QTY
PROVOX 37A8986X012 NSPP 37A8986X012
PROTECH PS-6509 15" TERMINAL MSR POS READY ALDELO
PROTECH PIRAMID SDI-77XL PASSIVE INFRARED DETECTOR
ProSoft MVI56-PDPMV1 DPV1 PROFIBUS Master Module for Allen Bradley
ProSoft MVI56-PDPMV1 DPV1 PROFIBUS Master Module ControlLogix 2012
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Promise VTrak J630sS hard drive array
Promise Removable Device PR401US Pegasus R4 4TB RAID System 4x1TB SATA
Promise Removable Device PR401US Pegasus R4 4TB RAID System 4x1TB SATA
Promise Removable Device PR401US Pegasus R4 4TB RAID System 4x1TB SATA
Promise Removable Device PR401US Pegasus R4 4TB RAID System 4x1TB SATA
PROLOG NDC-S911 NSPP NDCS911
PROFACE FN-HC10SK41 NSFP FNHC10SK41
ProCurve Switch 5412zl 96G J8700A
ProCurve 9304M Routing Switch Series 9300 J4139A
Processor Cables I/O Board only No Camera Included
Pro Audio/Video System w/CPU Constellation Console
Price includes VAT-Good conditiongood working order
PreSonus FireStudio Mobile Firewire Audio Interface Package Extended
PreSonus FireStudio Firewire Mobile Studio Interface Bundle Extended
PreSonus AudiioBox 44VSL 44 Audio Recording Computer Interface w Headphones
Precision Digital Panel Mounted Temperature Display
PPT Machine Vision Impact C40 Processor Cables I/O Bd
PowerCore CPCI-3750 Single Board CompactPCI® Computer
POWER PROCESS 512-K8705 TEMPERATURE CONTROLLER 2OUT 2AL
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portable recording DVR for thermal imaging FLIR cameras scope sights M18 M24 MTM
PMA DC 150-CAN intelligent DDC control PLC 16 digital I/O 9407 700 50341
PLC DIRECT D0-06AR USPP D006AR