1761-NET-ENI 产品就亿佳
PLC梯形图编程语言是从继电器接点控制线路图上发展起来的一种编程语言，两者的结构非常类似，但其程序执行过程存在本质的区别。同样作为继电器接点控制系统与梯形图的基本组成3要素——触点、线圈、连线，两者有着本质的不同。1．触点的性质与特点梯形图中所使用的输入、输出、内部继电器等编程元件的“常开”、“常闭”触点，其本质是PLC内部某一存储器的数据“位”状态。程序中的“常开”触点是直接使用该位的状态进行逻辑运算处理；“常闭”触点是使用该位的“逻辑非”状态进行处理。它与继电器控制电路的区别在于：①梯形图中的触点可以在程序中无限次使用，它不像物理继电器那样，受到实际安装触点数量的限制。②在任何时刻，梯形图中的“常开”、“常闭”触点的状态是的，不可能出现两者为“l”的情况，“常开”、“常闭”触点存在严格的“非”关系。 2．线圈的性质与特点梯形图编程所使用的内部继电器、输出等编程元件，采用了与继电器控制线路同样的“线圈”这一名称，但它们并非实际存在的物理继电器。程序对以上线圈的输出控制，只是将PLC内部某一存储器的数据“位”的状态进行赋值而已。数据“位”置“1”对应于线圈的“得电”；数据“位”置“0”对应于“断电”。它与继电器控制电路的区别在于：①如果需要，梯形图中的“输出线圈”可以在程序中进行多次赋值，即在梯形图中可以使用所谓的“重复线圈”。②PLC程序的执行，严格按照梯形图“从上至下”、“从左至右”的时序执行，在同一PLC程序执行循环内，不能改变已经执行完成的指令输出状态（已经执行完成的指令输出状态，只能在下一循环中予以改变）。有效利用PLC的这一程序执行特点，可以设计出许多区别于继电器控制线路的特殊逻辑，如“边沿”处理信号等。3．连线的性质与特点梯形图中的“连线”仅代表指令在PLC中的处理顺序关系（“从上至下”、“从左至右”），它不像继电器控制线路那样存在实际电流，在梯形图中的每一输出线圈应有各自独立的逻辑控制“电路”（即明确的逻辑控制关系），不同输出线圈间不能采用继电器控制线路中经常使用的“电桥型连接”方式，试图通过后面的执行条件，改变已经执行完成的指令输出。
MATROX P650 Dual Monitor AGP 8x Graphics Card, TESTED
MATROX P650 Dual Monitor AGP 8x Graphics Card dual DVI/VGA,TESTED
MATROX P650 Dual Monitor AGP 8x Graphics Card, TESTED
Matrox P65-MDDA 8X64F 2x DVI 64MB DualHead AGP 4x/8x GraphicsCard, Bulk
Matrox p65-MDDA 8x64f 2x DVI 64mb DualHead AGP id9163
Matrox P65-MDDA8X64 Millenium P650 Parhelia-LX 64MB Dual HeadAGP Video Card
Matrox P65-MDDA8X64F Millenium P650 Parhelia-LX 64MB Dual HeadAGP Video Card
MATROX P65-MDDAP64F / P65MDDAP64F (NEW NO BOX)
Matrox P65-MDDAP64F Millennium P650 64MB Dual View DMS-60 VideoGraphics Card
MATROX P65-MDDE128LPUF P650 128MB PCIe X 16 FULL HEIGHT VIDEOCARD & DUAL O/P CA
Matrox P65-MDDE64LP Graphics Card DMS-60 Low Profile
Matrox P65-MDDE64X1 P-Series Dual Head 64Mb PCIe Video GraphicCard *New*
MATROX P690 LP PCIe x16, P69 MDDE128LPF QUAD VGA MONITORSGRAPHICS CARD
MATROX P690 PCI EX16(B)P69-MDDE128F MM93720 Dual Screen DVIGraphics Card New
MATROX P690 PCIe x16 Dual Graphic Card W/ ADAPTERS AND SOFTWAREDISC.
Matrox P690 Plus LP PCIe x16 Quad VGA Monitors Graphics Card ,Win 7/8 TESTED
MATROX P690 PLUS LP PCIE X16 VIDEO CARD 256MB P69-MDDE256LAUFT7-B7
Matrox P690 Plus PCIe x16 Quad Monitors Graphics Card + 4x VGACable, Win 7/8
Matrox P690 Plus PCIe x16 Quad Monitors LP Graphics Card + 4xVGA Cable, Win 7/8
Matrox P69-MDDE128F Millennium P690 PCI Express x16 DDR2 SDRAMGraphics Card
MATROX P69-MDDE128F MILLENNIUM P690 PCI EXPRESS x16 DDR2 SDRAMGRAPHICS CARD (NO
Matrox P69-MDDE128LA1F Low-Profile Graphics Card 128MB, DDR2,PCI-E x1
Matrox P69-MDDE128LA1F P690 LP PCIe Express x1 128MB MemoryGraphics Video Card
Matrox P69-MDDE128LA1F P690 LP PCIe Express x1 128MB Memory NEWSealed
Matrox P69-MDDE128LPF P-Series Millennium P690 128Mb GDDR2 PCIeVideo Card *New*
Matrox P69-MDDE256LAUF P690 Plus LP PCIe 256MB DDR2 DVI VGAVideo Card
Matrox Parhelia 256MB DDR PH-A256 SDRAM AGP 4x/8x GraphicsAdapter AGP
Matrox Parhelia 256MB PCI-X Video Graphics Card MGIPH-P256
Matrox Parhelia 256mb PCI-X PCI Video Graphics card MGI PH P 256PDIF
MATROX Parhelia 256MB PCI-X PCI Video Graphics Card MGIPH-P256PDIF
MATROX Parhelia 256MB PCI-X PCI Video Graphics Card MGIPH-P256PDLF
Matrox Parhelia 256MB PCI-X Video Graphics Card MGI PH-P256
Matrox Parhelia 512GPU 128MB AGP 8x Card New PH-A128B
MATROX PARHELIA 8X 128MB DDR 256bit AGP Excellent Condition!
Matrox Parhelia APVe 128MB PCIe P65-MDDE128-VV KIT
Matrox Parhelia APVe PH-E128APV-VF 128MB DDR PCI Exp x16Workstation Video Card
Matrox Parhelia APVe PH-E128APV-VF 128MB DDR PCI Exp x16Workstation Video Card
MATROX Parhelia DL256 256MB PCI-X PCI Video Graphics Card
Matrox Parhelia MGI PH-E128APVF 128MB DDR1 DVI/TVO PCI-EGraphics Card #9708
Matrox Parhelia MGI PH-E128APVF 128MB Graphics Card PCIe DualDVI TVO
Matrox Parhelia P650 AGP 64MB Video Card.
Matrox Parhelia PH-E128APVF PCIe DIN8 Dual DVI Video Card BadFan AS-IS
Matrox Parhelia PH-E128APVF PCIe DIN8 Dual DVI Video CardF7197-03 Rev A
Matrox Parhelia PH-P256 256Mb PCI Graphics Card
MATROX PARHELIA SERIES & MATROX P-SERIES DRIVER CD
Matrox Parhelia-512 (PH-A8X128) 128MB DDR SDRAM AGP 4x/8xGraphics adapter
Matrox Parhelia-512 (PH-A8X128) 128MB DDR SDRAM AGP 4x/8xGraphics Card
MATROX PARHELIA-512 128MB PH-A128R RETAIL BRAND NEW KIT
Matrox Parhelia-LX 128MB PCIe Low Profile KX20 Video GraphicsMGI QID-E128LPAF
Matrox Parhelia-LX QID-QDA8X128 128MB AGP 4X/8X WorkstationVideo Card
Matrox PCI , G2+/150P/8D DUAL VGA / DVI GraphicsCard
Matrox PCI , G2+/150P/8D DUAL VGA / DVI Graphics Card
Matrox PCI Card Solios XA SOL6M4A Y7190-02 REV.A free ship
MATROX PCI DIGISUITE DTV 845-02 DLEDV/P 737-0101
MATROX PCI DIGISUITE DTV 845-02 DLEDV/P 737-0101 PCI
MATROX PCI DIGISUITE DTV VIDEO EDITING 738-0101ּ+MatroxDigiDesktop 681-01 Rev
MATROX PCI DIGISUITE DTV VIDEO EDITING 738-0101ּ+MatroxDigiDesktop 681-01 Rev
MATROX PCI DIGISUITE DTV VIDEO EDITING CARD DLEDV/N 845-02737-0101 Nice!
MATROX PCI DIGISUITE DTV VIDEO EDITING CARD DLITE/2/1/P 737-0101REV B
MATROX PCI DIGISUITE DTV VIDEO EDITING CARD DMAX/C Dig-Bus BRANDNEW
Matrox PCI Frame Grabber - 63039620278 - METEOR2-4w/Warranty
Matrox PCI Frame Grabber Card - METEOR2-CL/32 - 63039620280w/Warranty
MATROX PCI Frame Grabber Used Meteor_II 752-0202 63039620281REV.A PCB-I-E-1149
MATROX PCI Millenium MGA-MIL/2BI VGA Video Graphics ArrayAdapter Card. Works
Matrox PCI Video Card (Lot Of 5) HP 5064-0285
Matrox PCI Video Card (MGA-MYST/2/GAT)
Matrox PCI Video Card 618-04 REV A
MATROX PCIe Frame Grabber Used SOL6M4A Y7190-02 REV.APCB-I-E-836=6AX4
MATROX PCI-Express DVI Graphics Card F7230-00 Rev-A
Matrox Personal Producer/Prersonal Producer Express
Matrox PG-1281C/T AT&T CC 406071308 - WARRANTY!!!
Matrox PG-1281C/T AT&T CC 406071308 - WARRANTY!!!
Matrox PH-A128R Used **** test
Matrox PH-A8X128 128Mb DDR AGP Graphic Card
Matrox PH-A8X128 Parhelia 128Mb DDR AGP Workstation VideoGraphic Card *New*
Matrox PH-A8X256 Parhelia 256Mb DDR SDRAM 2048x1536 Video Card7119-0102 Rev A
Matrox PH-A8X256 Parhelia 256Mb DDR SDRAM 2048x1536 VideoGraphic Adapter
Matrox PH-E128APVF Parhelia APVe 128Mb DDR PCI Express x16 VideoGraphic Adapter
Matrox PH-E128APVF Parhelia APVe 128MB DDR PCI-E x16 DVI VideoCard
Matrox PH-E128APV-VF Parhelia APVe 128Mb DDR PCI-Express 2.0 x16Video Graphic A
Matrox PH-P256F 256Mb Medical Graphics Card F7128-0103
MATROX PIP-1024B
Matrox Pip-1024B Pip 1024B Expedited Shipping
MATROX PIP-512B / PIP512B (REPAIR EVALUATION ONLY)
MATROX PIP-512B REV 02 CPU BOARD **XLNT**
MATROX PIP-512B REV 02 CPU BOARD **XLNT**
MATROX PIP-512B REV 02 CPU BOARD 239-0201
Matrox PLC Processors Diagnostic Evaluation and RepairServices