Measurex 05291200結(jié)合PLC的組成和結(jié)構(gòu)分析PLC的工作原理更容易理解。PLC是采用周期循環(huán)掃描的工作方式，CPU連續(xù)執(zhí)行用戶程序和任務(wù)的循環(huán)序列稱為掃描。CPU對用戶程序的執(zhí)行過程是CPU的循環(huán)掃描，并用周期性地集中采樣、集中輸出的方式來完成的。一個掃描周期主要可分為：
（1）讀輸入階段。 每次掃描周期的開始，先讀取輸入點(diǎn)的當(dāng)前值，然后寫到輸入映像寄存器區(qū)域。在之后的用戶程序執(zhí)行的過程中，CPU訪問輸入映像寄存器區(qū)域，而并非讀取輸入端口的狀態(tài)，輸入信號的變化并不會影響到輸入映像寄存器的狀態(tài)，通常要求輸入信號有足夠的脈沖寬度，才能被響應(yīng)。
（2）執(zhí)行程序階段。 用戶程序執(zhí)行階段，PLC按照梯形圖的順序，自左而右，自上而下的逐行掃描，在這一階段CPU從用戶程序的條指令開始執(zhí)行直到*后一條指令結(jié)束，程序運(yùn)行結(jié)果放入輸出映像寄存器區(qū)域。在此階段，允許對數(shù)字量I/O指令和不設(shè)置數(shù)字濾波的模擬量I/O指令進(jìn)行處理，在掃描周期的各個部分，均可對中斷事件進(jìn)行響應(yīng)。
（3）處理通信請求階段。 是掃描周期的信息處理階段，CPU處理從通信端口接收到的信息。
（4）執(zhí)行CPU自診斷測試階段。在此階段CPU檢查其硬件，用戶程序存儲器和所有I/O模塊的狀態(tài)。
（5）寫輸出階段。每個掃描周期的結(jié)尾，CPU把存在輸出映像寄存器中的數(shù)據(jù)輸出給數(shù)字量輸出端點(diǎn)（寫入輸出鎖存器中），更新輸出狀態(tài)。然后PLC進(jìn)入下一個循環(huán)周期，重新執(zhí)行輸入采樣階段，周而復(fù)始。Measurex 05291200
如果程序中使用了中斷，中斷事件出現(xiàn)，立即執(zhí)行中斷程序，中斷程序可以在掃描周期的任意點(diǎn)被執(zhí)行。
如果程序中使用了立即I/O指令，可以直接存取I/O點(diǎn)。用立即I/O指令讀輸入點(diǎn)值時，相應(yīng)的輸入映像寄存器的值未被修改，用立即I/O指令寫輸出點(diǎn)值時，相應(yīng)的輸出映像寄存器的值被修改。

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Rexroth MSK040B-0600-NN-M1-UG0-NNNN -used-

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REXROTH VT-HNC100-1-23/W-08-P-0 DIGITAL AXIS control Achsensteuerung HNC100

Rexroth IndraDrive M Typ.HMD01.1N-W0036

Rexroth VT-HNC100-1-23/W-08-L-0, Rexroth R 900760931

Rexroth Schlitzzylinder RTC-DA-032-2100-BV-MMF1S00BLP000P0P0 OVP

Rexroth Indramat Bedienterminal BTA20 BTA20.3-NB-BP-VB-BS Neuwertig

Mannesmann Rexroth Elau Karteneinschub Geh?use

Rexroth Controller Card CSB01.1N-SE-ENS-NNN-NN-S-NN-FW R911305276 OVP

Rexroth Servo Motor MSK050C-0600-NN-M1-UG1-NNNN

Rexroth Profi Bus RMV04-DP Unbenutzt

Rexroth ECODRIVE Cs DKC10.3-004-3-MGP-01VRS inkl. Profibus GEB

Rexroth Hydraulikpumpe 1PV2V3-41/12 RG01MC63A1 (R5E2)

Bosch Rexroth Servodyn KM 3300-T 054915-106 KM3300

Bosch Rexroth Servodyn KM 3300-T 1070054915-302 KM3300

Bosch Rexroth SPS CL200 Magnet Roboterkarte PSM200

MANNESMANN REXROTH PVPQ-1 VT-PVPQ1-1X/0 VTS0618 + sockel

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Mannesmann Rexroth G.A.S DR 22 S MC01.22-24V 304372 Steuereinheit

Verst?rker für 2 Regelventile Bosch Rexroth 0 811 405 083

Bosch Rexroth Messsystem R310DE2386 Kugel- und Rollens.

Rexroth Indramat Permanentmagnet-Drehstromservomotor

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Rexroth Indramat ECO DRIVE DKC03.3-040-7-FW + FWA-ECODR3 + PBK02

DB 301 BOSCH REXROTH BOSCH DB301

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Rexroth IndraDrive C Packet HCS02.1E-W0012-A-03+CSH01.1C-PB-ENS-NNN-NNN-S1-S-NN

REXROTH VT 11077-24 VT11077-24 R900019669

INDRAMAT REXROTH SERCOS CSB01.1C-SE-ENS-NNN-NN-S-NN-FW INTERFACE, NEW

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REXROTH 4WMM10E31 USPP 4WMM10E31

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Caterpillar Rexroth pump

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Bosch Rexroth Mecman Bus Modul MNR: 3360150000

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(3210) Bosch Rexroth Directional Control Valve 9810232070 4000PSI

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REXROTH 1815503095 NSPP 1815503095

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Rexroth Amplifier Board VT5010 S22 R1 #1 11110035 233387 / 34

REXROTH VT 3017-37 #1 Mat.Nr. 00020302 R28 261946023 11110233

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Rexroth Analog amplifier module VT-MRMA1-1-11/V0/0 MNR: R900752430 OVP 4-4 #424

MECMAN REXROTH PNEUMATIC CYLINDER ACTUATOR 63MM BORE X 28" STROKE 170-360-0280

REXROTH 1070079832-101 NSPP 1070079832101

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REXROTH 0821401140 NSFP 0821401140

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Proportional valve Netstal 963.364.6106 Rexroth 4WRZ10W

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Rexroth Indramat Sercos DSS02.1M 109-0852-4B01-11 NOV

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USED REXROTH DRE 30-42/200Y SOLENOID VALVE,GV45A4-A 20051209 01,185VDC, 8A BJ

Rexroth Communication Module 0 608 830 241 #55122

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NEW OLD REXROTH DBDH10P16/315/12 PRESSURE RELIEF VALVE FL

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REXROTH 4WRA6E20-11/24NK4/M HY-PROPORTIONAL DIRECTIONAL VALVE RR00009279 NEW

NEW REXROTH MORRELL MC2005-10-006-01-084 SERVO CABLE 668884 REV B

NEW REXROTH MORRELL MC2005-10-006-01-054 SERVO CABLE 668903 REV B

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BOARD 1070084575-103 REXROTH, 09W35 1070086601-103, 08W22E

BOARD 1070090536-201 REXROTH, 08W33 1070090535-203

BOARD REXROTH 1070088226-204, 07W41E, 1070088225-206, 08W03

NEW OLD REXROTH R900599586, SL 20 PB 1-42, 05W28 HYDRAULIC CHECK VALVE FJ

Rexroth R005517586 Linear Actuator, Danaher Motion DBL2H00040-0R2-000-S40 Motor

REXROTH P-032024-00125 NSFP P03202400125

Rexroth Indramat Refu Drive 500 RD51.1-4N-005-L Frequency Converter

REXROTH P-031590-00000 NSFP P03159000000

REXROTH R-415-000-149 NSFP R415000149

   Foxboro P0971SU.C 10FT 70-Series WS Cable P0971SU - NEW