IC5005TAZ0010.IC5005TAZ0010.IC5005TAZ0010
結合PLC的組成和結構分析PLC的工作原理
結合PLC的組成和結構分析PLC的工作原理更容易理解。PLC是采用周期循環掃描的工作方式，CPU連續執行用戶程序和任務的循環序列稱為掃描。CPU對用戶程序的執行過程是CPU的循環掃描，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，先讀取輸入點的當前值，然后寫到輸入映像寄存器區域。在之后的用戶程序執行的過程中，CPU訪問輸入映像寄存器區域，而并非讀取輸入端口的狀態，輸入信號的變化并不會影響到輸入映像寄存器的狀態，通常要求輸入信號有足夠的脈沖寬度，才能被響應。
（2）執行程序階段。 用戶程序執行階段，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從用戶程序的第一條指令開始執行直到最后一條指令結束，程序運行結果放入輸出映像寄存器區域。在此階段，允許對數字量I/O指令和不設置數字濾波的模擬量I/O指令進行處理，在掃描周期的各個部分，均可對中斷事件進行響應。
（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。
（5）寫輸出階段。每個掃描周期的結尾，CPU把存在輸出映像寄存器中的數據輸出給數字量輸出端點（寫入輸出鎖存器中），更新輸出狀態。然后PLC進入下一個循環周期，重新執行輸入采樣階段，周而復始。
如果程序中使用了中斷，中斷事件出現，立即執行中斷程序，中斷程序可以在掃描周期的任意點被執行。
如果程序中使用了立即I/O指令，可以直接存取I/O點。用立即I/O指令讀輸入點值時，相應的輸入映像寄存器的值未被修改，用立即I/O指令寫輸出點值時，相應的輸出映像寄存器的值被修改。
WARRANTY FANUC SPINDLE SERVO DRIVE UNIT A06B-6059-H003 #H503 A16B-1100-0240 20B
Allen Bradley 809-A22E Ser A Instantaneous Trip Relay
Allen Bradley 6181P-15TP2KH VersaView 1500P Touch Panel Workstation DB
Allen Bradley 1769-L35E/A CompactLogix 5335E Processor Unit E01
Ships Today ** 2015** 2711P-T7C4D8 Panelview Plus Ternminal
Rockwell Automation 1336TGTBSP1A Allen Bradley Communications Board
Sealed Allen Bradley 1756-L55M13 /A Logix5555 Processor 1.5MB F/W Rev 1.4
Sealed Allen Bradley 1326AB-B515E-M2K5L /B Servo Motor 460V AC 3200RPM
LISTING 2711P-B6M20D PanelView Plus 600 Allen Bradley HMI Touchscreen Keypad - Spare
JOSLYN CLARK 4U4-2-240 PM D.C. CONTROL RELAY 4U42240
ALLEN-BRADLEY 175A AMP BREAKER 140U-JD6D3-D17
ALLEN-BRADLEY 175A AMP BREAKER 140U-JD3D3-D17
ALLEN-BRADLEY 1747-L541C CPU MODULE
Allen Bradley Panelview 550 2711-K5A10 Ser F Rev A FRN 3.01 In Original Pack
Allen Bradley Motor MPLB310PMJ74AA Catalog MPL-B310P-MJ74AA
ALLEN BRADLEY 520E-DOD-23 MULTI-SPEED SIZE 3 STARTER TWO SPEED NIB
Allen Bradley 2711-T6C20L1 /B PanelView 600 Color/Touch/EtherNet/RS232
Allen Bradley 2706-B23J8 Ser G Rev C CTRL FRN 3.02 DATALINER OPERATOR INTERF
ALLEN BRADLEY 2706-B23J16 DATALINER OPERATOR INTERFACE PANEL SER G D330216
Allen Bradley 2706-B13J8 Ser G Rev A CTRL FRN 3.00 DATALINER OPERATOR INTERF
ALLEN BRADLEY 2193FZ MCC FEEDER BUCKET 150A 140U-I6C3-D15
ALLEN BRADLEY 2094-DSD-HV100X /B 2094DSDHV100X
Allen Bradley 2090 Ultra Shunt Module - 2090-SR020-36 Series A
Allen Bradley 140U-JD6 140U-JD6D3-D20 3 pole 200 amp circuit breaker
2711-T5A8L1 Ser B FRN 4.46 PanelView 550 Allen Bradley HMI Contents Complete
MPL-B430H-SJ22AA ALLEN BRADLEY SERVO MOTORS REMANUFACTURED
Modicon A242
GE 44A399742-G01
FANUC A06B-6059-H206#H511 AC SPINDLE SERVO UNIT A20B-1003-0020 BASE & FAN UNIT
Fanuc A05B-2051-C143
Factory Sealed 2014 1756-EN3TR Allen Bradley EtherNet Interface 1756EN3TR 163F
Allen-Bradley: 3PH 2HP 5000RPM 460V 4.50AMP 334HZ - MPL-B320P-MJ22AA
Allen-Bradley Powerflex 700S 20DB4P2A0EYNANANE AC Drive 204 (208) VAC 4.2 Amps
Allen-Bradley MV SMC Interface Board 81000-199-55-R
Allen-Bradley Combination 512-DJBJ-6P Size 3 Non-fusible 24V Coil Nema 12
ALLEN-BRADLEY 512-BCB-6P-24R NEMA Combination Starter, Disconnect Type, NEMA 1,
ALLEN-BRADLEY 4100-232-RL IMC S CLASS COMPACT 2 AXIS MOTION CONTROLLER TESTED!
Allen-Bradley 20BD014A0AYNANC0 One Year Warranty !
ALLEN-BRADLEY 20AD027A0AYNANNN POWERFLEX 70 DRIVE
ALLEN-BRADLEY 1746-L541 SERIES C INPUT BOARD * IN BOX*
Allen-Bradley 150-A24NBDE One Year Warranty !
Allen Bradley Y-2012-1-H04AA Servo Motor 60mm Frame 115VAC Windings 4500RPM
ALLEN BRADLEY VERSAVIEW 1200P 6181P-12TPXPH SER B -?
ALLEN BRADLEY SP-170024 SP170024
ALLEN BRADLEY SP-151173 POWER SUPPLY **
Allen Bradley PowerFlex 70 Drive - 20A B 015 A3 AYNACG0 Series A
ALLEN BRADLEY POWER FLEX 70 20AE011A0AYNNNNN SERIES A * IN BOX*
ALLEN BRADLEY PANELVIEW PLUS 1000 2711P-K10C4A1 /A 2711PK10C4A1 2711-RP1A
Allen Bradley Panelview 600 2711-B6C15 Ser B Rev B FRN 3.13
Allen Bradley Panelview 550 2711-B5A8 Ser H Frn 4.46 *Great Condition* 2711B5A8
ALLEN BRADLEY PANELVIEW 2711PC-T10C4D1 2711PC-T10C4D1 2012
ALLEN BRADLEY PANELVIEW 2711-K9A8 SER. F FRN: 3.13 **
Allen Bradley Panelview 1000 2711-K10C9 Ser B Rev C FRN 3.40
Allen Bradley Panelview 1000 2711-K10C15 Ser C Rev C FRN 4.20 Excellent Conditio
Allen Bradley Panelview 1000 2711-K10C15 Ser C Rev C FRN 4.20
ALLEN BRADLEY PANELVEW 2711-K5A5 SER. H FRN:4.48 * IN BOX*
ALLEN BRADLEY PANEL VEW 2711-B6C9 SER. B FRN 3.13 **
Allen Bradley MPL-B540D-MJ24AA Servomotor
ALLEN BRADLEY MPL-B420P-MJ24AA MPLB420PMJ24AA
ALLEN BRADLEY MPL-B310P-MJ24AA MPLB310PMJ24AA
ALLEN BRADLEY MPL-A430H-SJ22AA MPLA430HSJ22AA
ALLEN BRADLEY MCC BUCKET 2100 CENTERLINE SERIES 24" SIZE 3
ALLEN BRADLEY GUARD SHIELD 440L-R4J0800YD SER. A RECEIVER * IN BOX*
ALLEN BRADLEY F-4030-Q-H00AN F4030QH00AN
Allen- Bradley ControlLogix Profibus DP Scanner
allen Bradley bundle
Allen Bradley Adjustable Frequency Drive, # 1333-YAA, Series C Stainless enc
ALLEN BRADLEY AC DRIVE 25KVA 1336S-B020-AN-EN-GM1-HA2-L5 SER B
ALLEN BRADLEY AC DRIVE 1305-BA09A SER. C * OUT OF BOX*
Allen Bradley ABB HVAC Drive ACH550-UH-023A-4 K452 Series 550 Lonworks Adapter
ALLEN BRADLEY 960182 960182
Allen Bradley 91612702 Rev A 8000 KRIO Interface Module _ 916127O2
ALLEN BRADLEY 8600-2163B 86002163B
Allen Bradley 8600 2085K Remote I/O Interface Module 86002085K -
ALLEN BRADLEY 849-ZOA32B 849ZOA32B
ALLEN BRADLEY 8410-MPSE 8410MPSE
ALLEN BRADLEY 810-A09AB 810A09AB
ALLEN BRADLEY 810-A07A 810A07A
Allen Bradley 809A10E NSNP **GENUINE** AB 809 A10E
Allen Bradley 809A09E **GENUINE** AB 809 A09E
ALLEN BRADLEY 803-F412X SER.B **
ALLEN BRADLEY 709-EOA 709EOA
ALLEN BRADLEY 6186M-12PT 6186M12PT
ALLEN BRADLEY 6158-AAZAAZAZZZ 6158AAZAAZAZZZ
ALLEN BRADLEY 6157-BEZAAAAZZZ 6157BEZAAAAZZZ
ALLEN BRADLEY 6157-BEYAAAAZZZ 6157BEYAAAAZZZ
ALLEN BRADLEY 6156-ABZAAZZZZZ 6156ABZAAZZZZZ
ALLEN BRADLEY 6156-ABZAAZAZZZ 6156ABZAAZAZZZ
ALLEN BRADLEY 512-BSB-24R SERIES B COMBINATION MOTOR STARTER **
ALLEN BRADLEY 500L-FOD93 AC CONTROLLER * IN BOX*
Allen Bradley 500EOD930 **GENUINE** AB 500 EOD930
ALLEN BRADLEY 445-P4L0480YD SER. A TRANSMITTER & RECEIVER * IN BOX*
ALLEN BRADLEY 284E-FVD2P3Z-10-CR-3 MOTOR CONTROLLER FREE SHIPPING !!!!
ALLEN BRADLEY 284D-FVD2P3Z-10-CR-3 284DFVD2P3Z10CR3
Allen Bradley 2800D-SN10-C-SM ArmorStart with 1Hp Starter
Allen Bradley 2711-T9C20 /C PanelView 900 Color/Touch/EtherNet/RS-232-Printer
Allen Bradley 2711-T9A1 Panel View 900 Series C FRN 1.01 Rev A - Refurbished
Allen Bradley 2711-T9A1 Panel View 900 Ser. C FRN 1.01 Rev A - Refurbished
Allen Bradley 2711-T6C8L1 /B PanelView 600 Color Touch DH+/RS-232 DC FRN 4.46
Allen Bradley 2711-T10C8 /D FRN 4.41 PanelView 1000 Color/Touch/DH+/RS-232
ALLEN BRADLEY 2711P-T10C4D2 SER. A PANELVIEW PLUS 1000 2711PT10C4D2
ALLEN BRADLEY 2711P-B12C4D2 PANELVIEW 1250
Allen Bradley 2711-K10C9 /E PanelView 1000 Color Keypad/RS232(DH-485)/RS-232-Pr
Allen Bradley 2711-K10C8 /D PanelView 1000 Color Keypad/DH+/RS-232-Prt, Read!
Allen Bradley 2711-K10C8 /D PanelView 1000 Color Keypad/DH+/RS-232-Prt FRN 4.41
Allen Bradley 2711-K10C8 /D PanelView 1000 Color Keypad/DH+/RS-232-Prt FRN 4.20
ALLEN BRADLEY 2711E-K10C6 SERIES B COLOR LCD KEYPAD DH+ RI/O COMMUNICATION--SA
ALLEN BRADLEY 2711-B6C1 2711B6C1
ALLEN BRADLEY 2711-B5A8 SERIES H PANELVIEW 550 REV.B FREQUENCY 4.41
ALLEN BRADLEY 2711-B5A16X PANELVIEW 550 SER. H, REV. D, FRN: 4.46, REFURBISHED
