描述
功能流程图的单流程结构形式简单,如图1所示,其特点是:每一步后面只有一个转换,每个转换后面只有一步。各个工步按顺序执行,上一工步执行结束,转换条件成立,立即开通下一工步,同时关断上一工步。用顺序控制指令来实现功能流程图的编程方法,在前面的章节已经介绍过了,在这里将重点介绍用中间继电器M来记忆工步的编程方法。
在图1中,当n-1为活动步时,转换条件b成立,则转换实现,n步变为活动步,同时n-1步关断。由此可见,第n步成为活动步的条件是:Xn-1=1,b=1;第n步关断的条件只有一个Xn+1=1。用逻辑表达式表示功能流程图的第n步开通和关断条件为:
式中等号左边的Xn为第n步的状态,等号右边Xn+1表示关断第n步的条件,Xn表示自保持信号,b表示转换条件。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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C61589 Varian G-292 Rotating Anode X-Ray Tube in B-130H
G52749 SSE Corp.M20 Wet Process Wafer Cleaning System
G54937 Alcatel IPUP A100L Dry Vacuum Pump
G54939 Alcatel IPUP A100L Dry Vacuum Pump
G71680 Valhalla Scientific D6100 Spectral Pwr.Analyzer
G54942 Alcatel IPUP A100L Dry Vacuum Pump
C54282 Hot Cold Temp Vacuum Wafer Chuck 11″Stage
G72623 Brinkman Metrohm 701 KF Titrino&703 Ti Stand
C67233 Adept Robot Module 90400-04318/XY-P177S180-1
A72721 Beckman Allegra 6R Refrigerated Centrifuge
L72707 Agilent VXI E1439C 95MSa/s Digitizer DSP Opt.001
C56452 Tektronix TLA715 Logic Analyzer(Calibrated 2010
G71828 DeHaart MPC 24/29 Screen Printer
L70516 Varian DS 102 Dual Stage Rotary Vane Vacuum Pump
A69922 Lot of(2)EPE Computer Power Center PowerPacs
C51252 Tektronix TLA715 Logic Analyzer(Calibrated 2010
CC44406 MRL 14TC-45 Conveyer Furnace/Reflow Oven
AC44258 Prometrix Spectromap Film Wafer System SM200/e
C69221 Wentworth FIX-R-1-E Probe Card Repair Station
A34721 Thermotron Environmental Chamber,460/3/60
A68882 Lindberg/Blue M STF55666C Solid Tube Furnace
C67797 R&K Rucker Kolls 300 Probe Card Building Station
C53849 Precision Measurement Microscope Sys w/X-Y Stage
C55172 Tektronix TLA715 Logic Analyzer
K67775 Kulicke&Soffa 6490 Semi-Auto DieBonder
N60611 2 Forma Scientific 3250 Water Jacketed Incubator
K71127 PRI Equipe ATM Wafer Robot&ESC-100 Controller
K71478 LOT 2 PRI/Equipe ATM Wafer Loading Robot Arm
A72337 PE Applied Biosystems GeneAmp PCR System 9700
C72662 Powervar GPI 3-Phase Power Conditioner 125kVA
C72667 MECS UTX-1000 Wafer Robot&CS-1000 Controller
C67115 HP Agilent 2090-0357 Vacuum Fluorescent Display
C67234 Adept Robot Module 90403-41063R XY-HRS063CS110A?D
CT40559 Multiple-Axis Focusing Laser Optics Positioner
C67232 Adept Robot Module 90400-04314/XY-P177S140-1AD
C67231 Adept Robot Module 90400-20025 XY-HRS025-M201A?D
C67230 Adept Robot Module 90402-30053 XY-HRS053-S201A?D-
C59691 Aetrium 900A Pick&Place IC Test Handler
C59690 Despatch LCC1-54N-2 Environmental Chamber
N66593 Beckman Instruments P/ACE 5500 System
A72720 Beckman GS-6R Refrigerated Centrifuge
L72705 Agilent VXI E2731B 20MHz to 6.0GHz RF Tuner
L72706 Agilent VXI E1439C 95MSa/s Digitizer DSP
N72744 Lot(2)HP 5890 Series II Gas Chromatographs
K72695 Innovate 9000 Semiconductor Test Head 220V
A72761 AMC Automation&Modular Component Modu-Con MX2
C70104 TermoTek P310 Recirculating Laser Chiller 18.0°C
C70149 Wentworth Probe Card Building/Repair Station
A62925 Nicolet 5DXC FT-IR Spectrometer
N59239 Nicolet 510 FT-IR Spectrometer FTIR
L69033 Asymtek FSLU Automated Wafer Loader(upstream)
C69606 Intevac NCT 200L Assy Sputtering Source Gun
C70441 Intevac Sputtering Source NCT Intervace Mark V
A39173 Carbolite Type GPC 12/65 Chamber Furnace,1200°C
AH43124 UTE SCS i 124 Substrate Vertical Lap Cleaner
A60926 ALPHASEM AG DB608-PRL Die Bonder w/Selectron
AC44359 Prometrix Resistivity Prober 6″VR-30A System
C71872 CTI-Cryogenics Cryo-Torr 100 Cryopump Cryo Pump
N62543 Branson/IPC PM-122 1000W RF Generator
N62542 Branson/IPC 2000C Controller 2000 C
K68523 Kern CPM1 Stereocomparato?r Mono/Stereo
A64697 Advanced Energy LDM Plasma RF Power Supply
AT51403 Hughes Model 2500 Automatic Die Bonder
Y69709 Hydra Cell Pump D17XASGNNEMB D17 D17X
A65762 Waters 717 Plus Autosampler
A64698 Advanced Energy PEP-2500 Plasma RF Power Supply
N70824 Christie Vista 38-DMD021-01 DLP Projector
N67909 BD GenTest KNA Solubility Scanner System
G61761 Applied Biosystems 373 DNA Sequence Stretch
Y69096 Asymtek FSL D Downstream Unloader
C69488 Neslab RTE-211 Refrigerated Recirculator Chiller