PLC采用循環掃描的工作方式，在PLC中用戶程序按先后順序存放，CPU從*條指令開始執行程序，直到遇到結束符后又返回*條，如此周而復始不斷循環。PLC的掃描過程分為內部處理、通信操作、程序輸入處理、程序執行、程序輸出幾個階段。全過程掃描一次所需的時間稱為掃描周期。當PLC處于停狀態時，只進行內部處理和通信操作服務等內容。在PLC處于運行狀態時，從內部處理、通信操作、程序輸入、程序執行、程序輸出，一直循環掃描工作。
1．輸入處理 輸入處理也叫輸入采樣。在此階段，順序讀入所有輸入端子的通端狀態，并將讀入的信息存入內存中所對應的映象寄存器。在此輸入映象寄存器被刷新。接著進入程序執行階段。在程序執行時，輸入映象寄存器與外界隔離，即使輸入信號發生變化，其映象寄存器的內容也不會發生變化，只有在下一個掃描周期的輸入處理階段才能被讀入信息。
  2．程序執行 根據PLC梯形圖程序掃描原則，按先左后右先上后下的步序，逐句掃描，執行程序。遇到程序跳轉指令，根據跳轉條件是否滿足來決定程序的跳轉地址。從用戶程序涉及到輸入輸出狀態時，PLC從輸入映象寄存器中讀出上一階段采入的對應輸入端子狀態，從輸出映象寄存器讀出對應映象寄存器，根據用戶程序進行邏輯運算，存入有關器件寄存器中。對每個器件來說，器件映象寄存器中所寄存的內容，會隨著程序執行過程而變化。
   3．輸出處理 程序執行完畢后，將輸出映象寄存器，即器件映象寄存器中的Y寄存器的狀態，在輸出處理階段轉存到輸出鎖存器，通過隔離電路，驅動功率放大電路，使輸出端子向外界輸出控制信號，驅動外部負載。

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140DDI84100C

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IC693CMM321

IC694ALG392

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6ES7314-6BF02-0AB

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2711-T10C8

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GECIRCUITBOARD44B399238-001/44A399722-G001*NEW*

1771-CAPE

AllenBradley1746-OA16SeriesC

VDI7561B

1746-RL52

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1336F-B125-AE-DE

2711-K10G8L1

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1746-NI8

TEXASINSTRUMENT7MT210

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霍尼韋爾honeywellDCS51401491-100/MU-TAMT02

3HAB3269-1Stop,axis3complete

ALLENBRADLEY800MR-A1AKNSFP800MRA1AK

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140CRA93100

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2711-K5A2

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AllenBradley1775SR5ScannerCommunicationAdapter*

1336F-A007-AF-EN

施耐德TSXDMZ28DR

1200108001

ABBulletinDrive1361D064181361D06418

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AllenBradley1769-OW8AC/DCRelayOutputModule

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6ES7414-3XJ00-0AB0

安川伺服SGDH-04AESGMAH-04AAA21

ALLENBRADLEY2711-NC11PANELVIEWMONITORVGACABLENIB

BERGERLAHRSER31122/4L5SSOCO

2731102PhoenixInterbusAnsch.IBSS7400ETHDSC/I-T

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Allen-Bradley1785-L20B/EEnhancedPLC-5ControllerRev:R01#96386073A01

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ABOVERLOADRELAY193-EA1GBSER.B193EA1GB

6ES7953-8LF11-0AA

EM210-20

W83L784RWinbond

DSQC101

CONTRAVESA8056-G03/QCD-2-0

51404127-250HPMFile,15Slot,CC

MOTOROLAMVME162-8132

DPW01

AllenBradley1394-AM7515KWaxismodule

AS-B827-032

HoneywellTK-FTEB01Rev.C

1747-OCTS

3HAC028179-001DSQC668axiscomputer

西門子板卡

21148-30SLT

140ACI04000

621-3560R

NDSM05貝利模塊低價銷售

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RAC3.5-150-460-A0I-W1-220

ABBDSAI145板卡

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GEFANUCIC693CHS398

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SPIRAXSARCOFT141/2'IRONBALLFLOATSTEAMTRAP

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AS-B804-016

安川伺服驅動器SGDJ-01AP

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AllenBradley1771-OBD

CMC303S3DC/DCIsolatorCard:CMC303S3

電源箱外殼4D33942G015

安捷倫E8251-60006配件

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6RA8222-UB0價格

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ALLENBRADLEY2711-T14C20USPP2711T14C20

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[福州卓凱電子科技有限公司

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51195156-300_51195156-300

SIEMENSC98043-A1006-L2+C98043-A1087-L1

FR-A024-0.2KP

2711-B5A3L1

SJ700B-300HFF風機水泵變頻器

1770-CD9

RexrothMannesmann00551860R08HydraulicServoDirectionalValve

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XVME-674

SGMGH-44ACA6C日本安川YASKAWA伺服電機

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CIMRF7U4022

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3HAB2214-1

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總線通訊模塊型號:Model:SST-PFB-CLX

西門子6ES5306-7LA119成新6ES5306-7LA11

IPMON01

AB8000-MDF8ZUSPP8000MDF8Z

170AAI14000C

RELIANCEELECTRIC57416-P/57C416

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SYMAX8010-SFW-472

美國ABAllen-Bradley48.001746-A10機架

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BoschSM25/50TCDC060842-202

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IC693PWR322RR

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1771-NBTC

AllenBradley1794-CE3EXTENDERCABLEFTERMINALBASE

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AS-BDAP-204

CPCR-FR01BR1S  

ALLEN-BRADLEY22D-D6P0N10422DD6P0N104

60DAYSWARRANTY!Logix5561ProcessWith2MbMemory

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AB280D-F12D-10C-?RR/CMOTORSTART

3HNA009886-001SCREWDIN912M10x100

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AllenBradleyCable1745-C3Used

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BoschServodynSM25/50-TC1065670-105(Nr.6)

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3HAW050008613-0151MotorStaticXP7400-600VM2008

140NOM211OO

AB24VDCSinkInput1794-IB32,AB,A/B,FlexI/O

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AllenBradley1771-ASBDCardsGreatCondition

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YASKAWA安川伺服電機SGMPH-04A1A-0Y12

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Allen-BradleySLC150ProgrammableController

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ALLENBRADLEY700S-DCP310DZ24NSFP700SDCP310DZ24

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ALLENBRADLEY1756-L621756L62CONTROLLOGIX

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安川伺服驅動器加電機SGME-02AF12BSGDE-02AP

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HN-8939RemoteAdapterChassis

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3HNA013586-001CABLEA2.X5-ID1-ID1/2

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30735866-001

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140ACI03000

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AB1794-IV16FlexI/O16ChannelDigitalInputModule

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1747-L40LABSLC500PLC1747L40LN785

6FX2001-5QS12

6SC6111-2AA00

3HNP03417-5FUSE_EQMOT_PROT

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Yaskawa安川伺服驅動器

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ALLEN BRADLEY 500L-BOC93 USPP 500LBOC93

6ES7331-1KF01-0AB

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EMERSONDELTAVKJ4001X1-NB1

Allen-Bradley1747-L532Fullytested+1YearWarranty!

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JAMSC-120NOM27100  

MA-0329-001

Allen-Bradley/YORKTimeDelayRelay700-N200A1New

ALLENBRADLEY1747-PICSLC500INTERFACECONVERTER

3HAB2151-1

GREINER65509896WellPolystyreneCellCultureMicropl

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NFD03.1-480-030

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武漢PLC控制器IC693PWR321SPLC控制器

1756-TBSHAllenBradleyControlLogix1756TBSHN210

歐姆龍C500-ID2153G2A5-ID215

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1336F-B150-AA-EN-GM2

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10XABAllenBradleyCarbonCompResistors1W18ohm!

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140NOE31100

ALLENBRADLEY2711-NC12NSPP2711NC12

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1336F-BP250-AA-IT-CM

ALLENBRADLEYPANNELVIEW2711PT6C20D*NEWINBOX*2711P-T6C20D

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98DM6003X1-GA2PARALLELBUFFER14

140ACO02000

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6FX1120-7BA01+6FX1126-6BB00+6FX1850-0BX02-4B+-0BX01-4B

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9861-610

NewAllenBradley1769-OB16CompactlogixOutputModule

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1771-NT2

140DAI75300

Uptofive1747-HSTP1modulescanshipimmediay

日本YASKAWA安川伺服放大器SGDA-01AP

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基恩士DH-220傳感器

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DataMetrics編碼器S-9719艾司達特公司

A06B-6079-H208

TWDALM3LT

EASONEASON11001

避雷器在線監測儀EHSA440000-L/EXCOUMT-1

TSXCDP301

370HS-1

150-F108NBDKUKARC30/51C

ABBTC512V11

1746-QV

ECE243-0

YASKAWA安川伺服電機SGMP-02A314C

3HAA3563-APA

2711-K5A1L1

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300203PCS

140CRP31200

AS-P800-003

NEWINBOXAllenBradley1785-L60B/ENIB1785L60B

Allen-BradleyTGE867

1771-IGC|TTLInputModule

ALLENBRADLEY1771-OGDNSPP1771OGD

西門子6ES7315-1AF03-0AB0

3HNA009168-001DRIVEUNITSERVO4-5-6HW

ALLENBRADLEY2711P-K10C4D1PANELVIEWPLUS1000NEW!!COLOROPERATORINTERFACE

140CPU43412A

1336F-B050-AJ-IT

1751-SL4SP

3HAC7519-3

E501700882PROCESSINTERFACEBOARD

JAMSP-PS22A  

CIMR-G5U43P7

140BP01600

3HAB-8101-8/08C

3HAWL000021Railblock_Rexroth

MOTOROLAMVME162-2101

PrecisionDAS100B-0300KFRGHC-0600KFRGHC?

PO916AE6卓凱電子3A99132G0210

MOD6/1X0030-167

AllenBradley1771-IGC

MFCUFC-1661

Schunk雄克自動液壓夾持刀柄SK4020

6ES7321-1FF01-0AA0

AS-B885-102

RDM545/100LHA

山武霍尼韋爾LDV-5202限位開關

HAROWE11BRW-300-B-101

160BA04NPS1P1AB160BA04NPS1P1

B&R-3PS465.9