描述

功能流程圖的單流程結構形式簡單，如圖1所示，其特點是：每一步后面只有一個轉換，每個轉換后面只有一步。各個工步按順序執(zhí)行，上一工步執(zhí)行結束，轉換條件成立，立即開通下一工步，同時關斷上一工步。用順序控制指令來實現(xiàn)功能流程圖的編程方法，在前面的章節(jié)已經(jīng)介紹過了，在這里將重點介紹用中間繼電器M來記憶工步的編程方法。

在圖1中，當n-1為活動步時，轉換條件b成立，則轉換實現(xiàn)，n步變?yōu)榛顒硬?，同時n-1步關斷。由此可見，第n步成為活動步的條件是：Xn-1=1，b=1；第n步關斷的條件只有一個Xn+1=1。用邏輯表達式表示功能流程圖的第n步開通和關斷條件為：

式中等號左邊的Xn為第n步的狀態(tài)，等號右邊Xn+1表示關斷第n步的條件，Xn表示自保持信號，b表示轉換條件。

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應用于以下領域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計算機控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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