IC646MPP001，IC646MPP001，IC646MPP001
可編程控制器的基本工作原理和應(yīng)用環(huán)境
可靠物理實現(xiàn)主要通過輸入（I， INPUT）及輸出（O， OUTPUT）電路。每一輸入點或輸出點就有一個I或O電路。而且，總是把若干個這樣電路集成在一個模塊（或箱體）中，然后再由若干個模塊（或箱體）集成為PLC完整的I/O系統(tǒng)（電路）。盡管這些模塊相當(dāng)多，占了PLC體積的大部分，但由于它們都是由高度集成化的，所以，PLC的體積還是不太大的。
輸入電路時刻監(jiān)視著輸入點的（通、ON或斷、OFF）狀態(tài)，并將此狀態(tài)暫存于它的輸入暫存器（還可能有別的稱謂）中。每一輸入點都有一個與其對應(yīng)的輸入暫存器。
輸出電路有輸出鎖存器（還可能有別的稱謂）。它也有兩個狀態(tài)，高、低電位狀態(tài)，并可鎖存。同時，它還有相應(yīng)的物理電路，可把這個高、低電位的狀態(tài)傳送給輸出點。每一輸出點都有一個與其對應(yīng)的輸出鎖存器。
這里的輸入暫存器及輸出鎖存器實際是PLC的I/O電路的寄存器。它們與PLC內(nèi)存交換信息通過PLC I/O總線及運行PLC的系統(tǒng)程序?qū)崿F(xiàn)。
把輸入暫存器的信息讀到PLC的內(nèi)存中，稱輸入刷新。PLC內(nèi)存有專門開辟的存放輸入信息的映射區(qū)。這個區(qū)的每一對應(yīng)位（bit）稱為輸入繼電器，或稱軟觸點，或稱為過程映射輸入寄存器（the process-image input register）。這些位（bit）置成1，表示觸點通，置成0為觸點斷。由于它的狀態(tài)是由輸入刷新得到的，所以，它反映的就是輸入點的狀態(tài)。
輸出鎖存器與PLC內(nèi)存中的輸出映射區(qū)也是對應(yīng)的。一個輸出鎖存器也有一個內(nèi)存位（bit）與其對應(yīng)，這個位稱為輸出繼電器，或稱輸出線圈，或稱為過程映射輸出寄存器（the process-image output register）。通過PLC I/O總線及運行系統(tǒng)程序，輸出繼電器的狀態(tài)將映射給輸出鎖存器。這個映射的完成也稱輸出刷新。
PLC除了有可接收開關(guān)信號的輸入電路，有時，還有接收模擬信號的輸入電路（稱模擬量輸入單元或模塊）。只是后者先要進行模、數(shù)轉(zhuǎn)換，然后，再把轉(zhuǎn)換后的數(shù)據(jù)存入PLC相應(yīng)的內(nèi)存單元中。
如要產(chǎn)生模擬量輸出，則要配有模擬量輸出電路（稱模擬量輸出模塊或單元）。靠它對PLC相應(yīng)的內(nèi)存單元的內(nèi)容進行數(shù)、模轉(zhuǎn)換，并產(chǎn)生輸出。
這樣，用戶所要編的程序只是，PLC輸入有關(guān)的內(nèi)存區(qū)到輸出有關(guān)的內(nèi)存區(qū)的變換。這是一個數(shù)據(jù)及邏輯處理問題。由于PLC有強大的指令系統(tǒng)，編寫出滿足這個要求的程序是完全可能的。
Allen Bradley 1492-N4 - Marking Strip - (3 rolls of 25')
Allen Bradley 1492-CB3-G100 Circuit Breaker 10 Amp ! WOW !
ALLEN BRADLEY 1492-CABLE25H PRE WIRED CABLE FOR 1746 DIGITAL I/O * *
Allen Bradley 1492-BF Power Block Standard Feed Through
Allen Bradley 140-MN-0240 Starter Manual Motor Series-B 1.6-2.4AMP ! WOW !
Allen Bradley 140-MN-0160 Manual Motor Starter
Allen Bradley 140M-C2E-C20 Ser. A Motor Protector 14.5-20A 575V 3 Pole ! WOW !
Allen Bradley 140M-C2E-B40 MPCB Standard Magnetic Trip ! WOW !
Allen Bradley 140M-C2E-B25 Breaker 2.5 Amp WOW
Allen Bradley 140M-C2E-B10 Ser. B Manual Motor Starter 600V 0.63-1A ! WOW !
Allen Bradley 140-CDN66 Door Handle for 140-CMN Black
Allen Bradley 1305 VFD AC Drive 1305-BA03A 0.75KW 1 HP
ALLEN BRADLEY 104993 R05 REGULATOR CARD
Allen Bradley 100-M12NZ243 Mini Contactor 24VDC 12A ! WOW !
Allen Bradley 100-DNX41R Auxiliary Contactor ! WOW !
Allen Bradley 100-C37D00 Contactor 110/120V ! WOW !
Allen Bradley 100-C30ZD00 Contactor ! WOW !
Allen Bradley 100-C30DZ00 Contactor 30amp 24vdc! WOW !
Allen Bradley 100-C30DJ00 Contactor 30 Amp 24VDC ! WOW
Allen Bradley 100-C23ZZ10 Contactor 24VDC 600VAC 30A ! WOW !
Allen Bradley 100-C23D10 Contactor 110/120VAC ! WOW !
Allen Bradley 100-C16ZZ10 Contactor 7.5kW 400V 24VDC 1NO ! WOW !
Allen Bradley 100-C16ZD10 Contactor ! WOW !
Allen Bradley 100-C16DJ400 MCS-C Contactor 16A 24VDC IEC ! WOW !
Allen Bradley 100-C12KJ10 Contactor 12 Amp 24VDC WOW
Allen Bradley 100-C12DJ10 MCS-C Contactor IEC 12A 24VDC ! WOW !
Allen Bradley 100-C12DJ01 Contactor 12 Amp 24VDC ! WOW
Allen Bradley 100-C12B10 Contactor 12Amp 440/480V Coil ! WOW !
Allen Bradley 100-C09Z10 Contactor 9AMP 24VDC Coil ! WOW !
Allen Bradley 100-C09L10 Contactor 9 Amp 600V ! !
Allen Bradley 100-C09F10 Non-Reversing Contactor 1NO 3Pole 9A 220/230V ! WOW !
Allen Bradley 100-C09DZ10 Contactor 25A 600VAC 24VDC Coil ! WOW !
Allen Bradley 100-C09DZ01 Contactor 9AMP 600VAC 24VDC Coil ! WOW !
Allen Bradley 100-A30ND3 Contactor 30 Amp 120V ! AS-IS !
Allen Bradley 100-A09NZJ3 Contactor 9A 24VDC ! WOW !
ALLEN BRADLEY * * 872C-A5N18-A2 PROXIMITY SENSOR
1794-IF2XOF2I Allen Bradley Isolated Combo Flex I/O 1794-TB3 1794-IF2X0F2I Base
SPRECHER+SCHUH S+S CONTACTOR CA7-43-00-277 EQUAL TO ALLEN-BRADLEY 100-C43T00
NIB ALLEN BRADLEY 800T-PA16G ILLUMINATED PUSH BUTTON GREEN PILOT LIGHT 120 V
ALLEN BRADLEY 42DRU-5200 PHOTOSWITCH POLARIZED BEAM REFLEX PHOTOHEAD
- Allen-Bradley 440N-Z21S16A SensaGuard Non-Contact Switch
ALLEN-BRADLEY X-359510 Industrial Transformer ! WOW !
ALLEN-BRADLEY X 35452 Cross Bar Assy Starter&Contactor
Allen-Bradley Terminal Lugs Contactor 100-DL180
ALLEN-BRADLEY TC-714 | TC714 Coil 24VDC ! WOW !
Allen-Bradley Proximity Switch 872C0A10 N30 A ! WOW !
ALLEN-BRADLEY PROXIMITY SWITCH 200mA 872C-D3NN12-D4 WOW
ALLEN-BRADLEY MANUAL TOGGLE SWITCH TYPE 230V 600AX-4
Allen-Bradley Control Relay Type H 30A 700-HG47A1 ! NIB
Allen-Bradley Control Relay 300VAC 10A 700-MB310* ! WOW
Allen-Bradley Contactor NEMA Size 0 600V 9A 500-T0D94 B
Allen-Bradley Contactor 100-C09D10 110/120V 9A! WOW !
Allen-Bradley Auxiliary Contact 1.0-1.6A 193-TA B16 A
Allen-Bradley AC Relay Series B 700-P800A1 ! WOW !
Allen-Bradley AC Control Relay 700-PK800A1 A ! WOW !
Allen-Bradley AC Contactor 700-F400A1 B 110/120V ! WOW !
Allen-Bradley 872C-DH5NN18-D4 Proximity Sensor 10-30VDC
ALLEN-BRADLEY 872C-D3NN12-D4 Proximity Sensor ! IN BAG !
ALLEN-BRADLEY 872C-D3CP12-D4 Proximity Sensor ! !
ALLEN-BRADLEY 871T-L2A12 Proximity Sensor ! WOW !
ALLEN-BRADLEY 871C-D4NE12-A2 Proximity Sensor ! NO PKG !
ALLEN-BRADLEY 800T-H5A *NIB* SELECTOR SWITCH TYPE 4/13 SER T (2F0)
ALLEN-BRADLEY 800T-A6A *NIB* PUSH BUTTON TYPE 4/13 SER T RED (2F0)
ALLEN-BRADLEY 800T-16HX2KB6*NIB*ILLUMINATED SELECTOR SWITCH SER T 120V 1.2W(2E2)
ALLEN-BRADLEY 800H-R2D1 *NIB* PUSH BUTTON SWITCH TYPE 4/4X SER F (2F0)
ALLEN-BRADLEY 800H-JR4A *NIB* 3 POS SELECTOR SWITCH TYPE 4 4X/13 SER F (2F0)
ALLEN-BRADLEY 800H-AR6A *NIB* PUSH BUTTON SWITCH TYPE 4/4X/13 SER F (2F0)
ALLEN-BRADLEY 700-ZBR520AZ1 SAFETY RELAY SER A (1D1)
ALLEN-BRADLEY 700-NA40 Deck Cartridge Relay ! !
ALLEN-BRADLEY 700-N5 Surge Suppressor 150VAC ! !
Allen-Bradley 700-HTM-12MA1 Multi Range Timer on Delay 0.5s-300hrs ! WOW !
ALLEN-BRADLEY 700-HSMD Surge Suppressor Diode ! WOW !
ALLEN-BRADLEY 700-FEB3YU23 Circuit Breaker ! WOW !
ALLEN-BRADLEY 700-CF310ZJ 24VDC 600V 20A Control Relay WOW
ALLEN-BRADLEY 592-JOV16 Manual Overload Relay ! WOW !
ALLEN-BRADLEY 2090-U3CBB-DM12 CN1 CONTROL INTERFACE BOARD * * SER A (3E2)
ALLEN-BRADLEY 199-MSMV1 MovSuppressor 12-55VAC 12-77VDC
ALLEN-BRADLEY 199-MSMA1 Surge Suppressor 110-240V
ALLEN-BRADLEY 199-FSMA10 Surge Suppressor 50-125V ! WOW
ALLEN-BRADLEY 193-EB1FB Overload Relay 3.7-12A ! WOW !
ALLEN-BRADLEY 193-CPC 63 Overload Relay 45-60A WOW
ALLEN-BRADLEY 1794-TB2 FLEX I/O TERMINAL BASE *NIB* SER A
ALLEN-BRADLEY 1794-PS1/A POWER SUPPLY MODULE SER A (3A2)
ALLEN-BRADLEY 1771-P7 B POWER
