2、 PAC的平臺(tái)
MDD112D-N-030-N2M-130GL0快速增長(zhǎng)的PAC平臺(tái)是基于PXI。由于PXI結(jié)合了PCI總線的電路特性和Compact PCI堅(jiān)固的歐羅卡機(jī)械結(jié)構(gòu),這種結(jié)構(gòu)已在工業(yè)環(huán)境中成功使用了許多年,當(dāng)今NI,Chroma,LeCroy和JTAG等供應(yīng)商現(xiàn)在可提供1,000多種獨(dú)特的I/O模塊,包括模擬I/O、數(shù)字I/O、視覺、運(yùn)動(dòng)和高精度數(shù)據(jù)采集。典型的有如下四種PAC硬件平臺(tái)。
*PXl對(duì)工業(yè)化PC做了改善,MDD112D-N-030-N2M-130GL0具有實(shí)時(shí)OS(操作系統(tǒng)),標(biāo)準(zhǔn)的散熱,可選的不旋轉(zhuǎn)固態(tài)硬盤和內(nèi)置的模塊間同步。PXl標(biāo)準(zhǔn)要求所有的機(jī)箱能為每個(gè)模塊插槽提供25W的空氣流制冷,這樣甚至在使用高功率繼電器,高速PXl或CompactPCI卡時(shí)也不會(huì)使工作系統(tǒng)過熱或者縮短壽命。
*Compact FieldPoint使用工業(yè)級(jí)的部件來抗強(qiáng)沖擊和振動(dòng),其工作溫度范圍為-40oC到70oC,并且具有Class 1 Division 11部和Lloyd‘s認(rèn)證。它也采用傳導(dǎo)式制冷來代替旋轉(zhuǎn)風(fēng)扇,由于不使用活動(dòng)部件而提高了可靠性。
*Compact Vision系統(tǒng)是為機(jī)器視覺而專門設(shè)計(jì)的堅(jiān)固的控制器。MDD112D-N-030-N2M-130GL0它使用IEEE標(biāo)準(zhǔn)1394FireWire接口,可以在視覺應(yīng)用中和16臺(tái)攝像機(jī)通信。
*CompactRIO是新型的可重復(fù)設(shè)置的嵌入式系統(tǒng),MDD112D-N-030-N2M-130GL0它基于LabVlEWFPGA和LabVlEW實(shí)時(shí)技術(shù)。CompactRIO系統(tǒng)采用具有3百萬門的FPGA芯片來控制模塊化的數(shù)字和模擬I/O。這些FPGA芯片可以運(yùn)行嵌入在芯片里的代碼,它的數(shù)字循環(huán)的速率高達(dá)1MHz,模擬循環(huán)的速率為150kHz。FPGA可以把信息傳回到運(yùn)行LabVlEWRT的浮點(diǎn)處理器以進(jìn)行高級(jí)計(jì)算和數(shù)據(jù)記錄和通信。由于有金屬外殼和傳導(dǎo)式制冷,該控制器非常適合用于嚴(yán)酷的環(huán)境。
3、PAC優(yōu)于PLC的多種原因分析。
之所以PAC優(yōu)于PLC,將從成本,高級(jí)功能,外形結(jié)構(gòu),控制器,I/O和軟件等六個(gè)方面的特征作分析。
3.1成本-最為經(jīng)濟(jì)的選擇
MDD112D-N-030-N2M-130GL0采用了單一的控制器節(jié)省了成本。它具有單一的控制器和機(jī)箱,可用于處理數(shù)字和模擬I/O,具有運(yùn)動(dòng)、視覺功能和模塊化儀器,因此不再需要花錢購(gòu)買多個(gè)控制器。正因?yàn)槿绱?,如果需要控制系統(tǒng)具有多種功能,如視覺或模塊化儀器,那么采用PAC將是最為經(jīng)濟(jì)的選擇。
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MDD112D-N-030-N2M-130GL0
MDD090B-N-040-N2M-110GA1
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MDD112D-N-020-N2L-130-PB2
MDD093C-N-030-N2L-11PBG
MDD-093B-F-020-N2L-110GA0
MDD090C-N-030-N2M-110GB2
MDD-093A-N-060-N2L-110GB0
MDD090C-N-040-N2M-110GL1
MDD093C-N-020-N2M-110PAO
MDD112D-N-030-N2L-130PB0
MDD090C-N-030-N2M-110GB1
MDD112B-N-020-N2L-130-PB6
MDD112D-N-030-N2L-130PA0
MDD112D-N-030-N2M-130PB0
MDD112C-N-030-N2M-130PB2
MDD071C-N-060-N2T-095GB2
MDD065B-N-040-N2L-095GA0
MDD090B-N-030-N2L-110PA0
MDD071B-N-040-N2M-095PB1
MDD093B-N-030-N2L-110PB0
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MDD112D-N-030-N2L-130PB0
MDD112C-N-030-N2M-130GB2
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MDD071B-N-040-N2M-095PB1
MDD112D-N-030-N2L-130PB0
MDD093C-N-040-N2M-110GB0
MDD065B-N-040-N2L-095GB0
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MDD112B-N-040-N2L-130PA0
MDD090A-N-030-N2L-110PB0
MDD090C-N-030-N2L-110PB0
MDD071A-N-030-N2T-095PB0
MDD093A-N-030-N2L-110GB0
MDD112B-N-040-N2L-130PA0
MDD071C-N-030-N2S-095GB0
MDD093C-N-020-N2L-110GA0
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MDD093B-N-020-N2L-110PA0
MDD093A-N-030-N2L-110GA0
MDD112C-N-030-N2M-130GA0
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MDD112C-N-040-N2M-130GB2
MDD090C-N-030-N2M110PB0
MDD112C-N-030-N2M-130GB1
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MDD112D-N-030-N2M-130PB0
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