大连西门子授权一级代理商通讯电缆供应商采购
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 在用户程序执行过程中，只有输入点在I/O映象区内的状态和数据不会发生变化，而其他输出点和软设备在I/O映象区或系统RAM存储区内的状态和数据都有可能发生变化，而且排在上面的梯形图，其程序执行结果会对排在下面的凡是用到这些线圈或数据的梯形图起作用；相反，排在下面的梯形图，其被刷新的逻辑线圈的状态或数据只能到下一个扫描周期才能对排在其上面的程序起作用。
      输出刷新
      当扫描用户程序结束后，PLC就进入输出刷新阶段。在此期间，CPU按照I/O映象区内对应的状态和数据刷新所有的输出锁存电路，再经输出电路驱动相应的外设。这时，才是PLC的真正输出。
同样的若干条梯形图，其排列次序不同，执行的结果也不同。另外，采用扫描用户程序的运行结果与继电器控制装置的硬逻辑并行运行的结果有所区别。当然，如果扫描周期所占用的时间对整个运行来说可以忽略，那么二者之间就没有什么区别了。

WARRANTY ALLEN BRADLEY AB 7300 UCS BOARD 635206 9003 Rev-3 7300UCS1 M501
WARRANTY ALLEN BRADLEY 1336-BDB-SP29D CONTROL BASE DRIVER BOARD 74103-244-59 14
Ovation 1C31219G01 Relay Output Indicator
Surplus Allen Bradley 1332-BAA adjustable frequency AC Drive 3 phase 230V
Sealed Allen Bradley 1784-U2DN /A USB-to-DeviceNet Adapter Pkg 2015
Sealed Allen Bradley 1771-IXE /C 1771-1XE PLC-5 mV/Thermocouple Input Module
Sealed Allen Bradley 1771-ACN15 /B ControlNet Communication Interface Module
Sealed Allen Bradley 1756-EN3TR /B Pkg 2014 ControlLogix EtherNet/IP Module
Sealed Allen Bradley 1747-L542 /C SLC 500 SLC 5/04 Processor DH+/RS232 FRN 8
LISTING Allen Bradley 1769-L35E | CompactLogix EtherNet Processor - Mfg 2008 *NIB*
ALLEN-BRADLEY 2711-K3A5L1/B 2711K3A5L1 SERIES B , FRN 4.48 , MFG 2012
ALLEN-BRADLEY 100-D180EZJ11 CONTACTOR 180A 3P 24VDC
Allen Bradley MPL-B220T-VJ42AA /A Servo Motor 460V 6000RPM No Brake
ALLEN BRADLEY 2755-SN5 ADAPTASCAN BARCODE READER SER B REV A D376266
Allen Bradley 2711P-RDK10C /A Color 10.4-in Display Module
Allen Bradley 2711-K**10 /H PanelView 550 Monochrome/Keypad/DeviceNet/RS232
1769-L35E Ser A FW 1.15 Allen Bradley MicroLogix Compact 5335E CPU Processor
GE 44A399729-G07大连西门子授权一级代理商通讯电缆供应商采购FACTORY SEALED ALLEN-BRADLEY 1756-M02AE 1756M02AE SER A
FACTORY SEALED ALLEN-BRADLEY 1756-IF8IH 1756IF8IH SER A , MFG 2015
FACTORY SEAL ALLEN-BRADLEY 1771-CFM/C 1771CFM SERIES C
FACTORY SEAL ALLEN-BRADLEY 1747-L532/E 1747L532 SER E , FW 11 , MFG 08/2014
FACTORY SEAL ALLEN-BRADLEY 1747-L532/E 1747L532 SER E , FW 11 , MFG 05/2014
Allen-Bradley PanelView 550 2711-T**16L1 Series B Rev C FRN 4.41 RS-232 DF1 24VD
Allen-Bradley Kinetix 6000 2094-BC02-M02 15KW/1** Integrated Axis Module --
Allen-Bradley Kinetix 6000 2094-BC01-M01 Axis Module Firmware : 1.89 --
Allen-Bradley Compact Logix Enet Controller ( 1769-L32E) -NIB FS
Allen-Bradley AC Servo Motor 1326AB-B515E-21-L 1326ABB515E21L _ 3200 RPM
ALLEN-BRADLEY 512-BAB-A3F-6P-24R COMBINATION STARTER, DISCONNECT TYPE, NEMA 1
ALLEN-BRADLEY 2711-T6C20L1 TESTED! QUANTITY! SER.B FRN:4.46 PANELVIEW 600 SCREEN
Allen-Bradley 1785-LT3 Lifetime Warranty !!!
Allen-Bradley 1756L1M3 Ser. A Control Logix PLC Processor
ALLEN-BRADLEY 1494G-BC3N-420 !! 30A STAINLESS STEEL ENCLOSED DISCONNECT
ALLEN-BRADLEY 1336-B010-EAD-FA2-L1, 1336 CONSTANT TORQUE 3 PH AC DRIVE
ALLEN BRADLEY TLAR-A1200E-B2A TLARA1200EB2A
ALLEN BRADLEY SYC80533-1 SYC805331
ALLEN BRADLEY SP-151141 SP151141
ALLEN BRADLEY SP-151137 SP151137
Allen Bradley Size 4 Starter 509-EOD Series A
Allen Bradley Size 4 Combination 3R 4 12 Enclosure 509-EOD 120 V HMCP 150 Amp
Allen Bradley Servo Controller Kinetix 6000 2094-AC05-MP5 SIE
ALLEN BRADLEY POWERFLEX 700 3PHASE SERVO DRIVE SER.A 20BC043A0AYNANA0 99253
Allen Bradley PowerFlex 700 20BD034A0NYNANN0 /A 25HP 480V
ALLEN BRADLEY POWER FLEX 70 WITH 20-COMM-E COMMUNICATION PORT
Allen Bradley PLC 1746-NO8I OUTPUT MODULE
ALLEN BRADLEY MS-598 SERIES A CIRCUIT BREAKER ASSEMBLY,
Allen bradley MPM-B1653F-MJ74AA SERVOMOTOR MOTOR SERVO
ALLEN BRADLEY MPL-B430P-SJ22AA MPLB430PSJ22AA
ALLEN BRADLEY MPL-B430P-HK74AA MPLB430PHK74AA
ALLEN BRADLEY MPL-A4540F-SJ22AA M4540FSJ22AA
ALLEN BRADLEY MPL-A430P-MK22AA M430PMK22AA
ALLEN BRADLEY MP-12117 MP12117大连西门子授权一级代理商通讯电缆供应商采购Allen Bradley Integr. Axis Module 2094-BC01-MP5-S OVP
Allen Bradley Industrial Touchscreen Computer Pentium II 333 MHz 64 MB Ram 6180-
Allen Bradley Industrial Computer Pentium II 400MHz Touchscreen 6180-EIKEFFAZFCZ
Allen Bradley Circuit Board 900156 Rev 5 or Rev A01
ALLEN BRADLEY AC DRIVE 1336F-BRF30AE-EN-HCS1 SER B
ALLEN BRADLEY 852S-NX4 852SNX4
ALLEN BRADLEY 8500-E151 8500E151
ALLEN BRADLEY 810-A04CR 810A04CR
ALLEN BRADLEY 810-A03CR 810A03CR
ALLEN BRADLEY 808-R1 808R1
ALLEN BRADLEY 808-M1LA2 SER.F SPEED SWITCH 808M1LA2
ALLEN BRADLEY 808-K4 808K4
ALLEN BRADLEY 808-C4 808C4
ALLEN BRADLEY 80165-438-52 8016543852
ALLEN BRADLEY 800H-6HX 800H6HX
ALLEN BRADLEY 8000-AF RESOLVER CIRCUIT BOARD 900072 REV-3 * NO BOX*
ALLEN BRADLEY 8000 VADZ CONTROL/KEYBOARD MODULE,
ALLEN BRADLEY 7300-UCJ-1 7300UCJ1
Allen Bradley 700-N400A1 Control Relay Series C (Pack of 10) -
ALLEN BRADLEY 634545-01 63454501
ALLEN BRADLEY 634385 634385
ALLEN BRADLEY 6189-RPRH 6189RPRH
Allen Bradley 6182H-10BEH4D /A VersaView CE 1000 Touch/Keypad/Ethernet/RS-232
ALLEN BRADLEY 6182-AGAZZC A INDUSTRIAL COMPUTER TOUCH
ALLEN BRADLEY 6008-SV 6008SV大连西门子授权一级代理商通讯电缆供应商采购ALLEN BRADLEY 512-BCB-6P-24R 512BCB6P24R
ALLEN BRADLEY 509-EOC 509EOC
ALLEN BRADLEY 507-BFBD-A2E-38 507BFBDA2E38
Allen Bradley 50 HP Drive 1336F-B050-AN-EN Ser. B Excellent Working Condition
ALLEN BRADLEY 4100-214-PR 4100214PR
ALLEN BRADLEY 3110-A4 3110A4
ALLEN BRADLEY 3110-A3 3110A3
ALLEN BRADLEY 280D-F12Z-10C-GRW-3-P1 COMBINATION STARTER AND BASE,
ALLEN BRADLEY 280D-F12Z-10B-CRW SERIES C ARMORSTART MOTOR CONTROLLER,
ALLEN BRADLEY 280A-F12Z-10C-RRW-3 280AF12Z10CRRW3
ALLEN BRADLEY 2801-NL9 2801NL9
ALLEN BRADLEY 2755-LD4B4 2755LD4B4
ALLEN BRADLEY 2755-DS4A-B6-R1 2755DS4AB6R1
ALLEN BRADLEY 2755-DS1A-B2 2755DS1AB2
Allen Bradley 2711P-T10C4D2 /A PanelView Plus 1000 Touch/Enet/RS232 128MB Read
Allen Bradley 2711-K10C8 /B PanelView 1000 Color Keypad/DH+/RS-232-Prt, FRN 3.30
ALLEN BRADLEY 2711E-K10C6 2711EK10C6
ALLEN BRADLEY 2706E23J16B1 OPERATOR INTERFACE 2LINE
ALLEN BRADLEY 2706-E23J16B1 -- 2706E23J16B1
ALLEN BRADLEY 2706-B23J8 2706B23J8
ALLEN BRADLEY 2706-B23C8 2706B23C8
ALLEN BRADLEY 2705-P22J3L 2705P22J3L
ALLEN BRADLEY 22D-D010N104 SERIES A AC DRIVE POWER FLEX 40P,
ALLEN BRADLEY 22C-B049A103 22CB049A103
ALLEN BRADLEY 20AD3P4A2AYYNRG0 20AD3P4A2AYYNRG0
ALLEN BRADLEY 20AD2P1A3AYNNNNN 20AD2P1A3AYNNNNN
ALLEN BRADLEY 20A-D1P1C3AYNAEC0 20AD1P1C3AYNAEC0
Allen Bradley 20AD027A0AYNANC0 | Tested with 12 month warranty
ALLEN BRADLEY 20A-D014A0AYNANNN 20AD014A0AYNANNN NO BOX
ALLEN BRADLEY 20AC5P0A0AYNANNN 20AC5P0A0AYNANNN
ALLEN BRADLEY 20A D 014 A 3 AYNADNN 20AD014A3AYNADNN SER. A POWERFLEX 70 AC
ALLEN BRADLEY 2094-BM02-S SERIES B SERVO MODULE WITH SAFETY,
Allen Bradley 2094-AL75S Kinetix 6000 Line Interface Module 7**mp 230Vac
Allen Bradley 1860-MT3 1860MT3 Fastening Module (Pack of 3) -
ALLEN BRADLEY 1797-BIC 1797BIC
ALLEN BRADLEY 1794-IR8 1794IR8ALLEN BRADLEY 1785KE INTERFACE MODULE DATA HWY PLUS RS-
ALLEN BRADLEY 1775-A1 177**1
ALLEN BRADLEY 1774-LB2 1774LB2
ALLEN BRADLEY 1772-P1 1772P1
ALLEN BRADLEY 1771-ODD 1771ODD
ALLEN BRADLEY 1771-M1 1771M1
ALLEN BRADLEY 1771-KD 1771KD
Allen Bradley 1771-KA2
Allen Bradley 1771-IT Input Module 1771IT (Pack of 10) -
Allen Bradley 1771-IAD/D Input Module 1771IADD Series D (Pack of 6) -
ALLEN BRADLEY 1771-ES 1771ES
ALLEN BRADLEY 1771-0Q16 SERIES A ISOLATED 24VDC OUTPUT MODULE
ALLEN BRADLEY 1770-LDA 1770LDA
ALLEN BRADLEY 1770-HT1 1770HT1
ALLEN BRADLEY 1756-OF8 1756OF8
ALLEN BRADLEY 1756-M23 1756M23
ALLEN BRADLEY 1756-M16SE 1756M16SE
ALLEN BRADLEY 1756-L63S SERIES B 1756L63S 2011 PROCESSOR/CONTROLLER CONTROLLOGIX
Allen Bradley 1756-L55M14 ControlLogix CPU with 3.5mb memory & 12 month warranty
ALLEN BRADLEY 1756-IF4FXOF2F -- 1756IF4FXOF2F
ALLEN BRADLEY 1756-CNBR 1756CNBR
ALLEN BRADLEY 1747-L552 SERIES C PROCESSOR MODULE 1747L552 PROC. REV. 5 FRN. 11
ALLEN BRADLEY 1747-L543 1747L543
Allen Bradley 1747-ASB SLC-500 Remote Adaptor Module with 12 month warranty
ALLEN BRADLEY 1747-ACN15 -- 1747ACN15
ALLEN BRADLEY 1746-NO8I 1746NO8I
ALLEN BRADLEY 1746-NO4I 1746NO4I
ALLEN BRADLEY 1746-NI8 1746NI8大连西门子授权一级代理商通讯电缆供应商采购ALLEN BRADLEY 1746-BAS SERIES C FRN 5 SLC-500 BASIC MODULE 90 DAYS NNB
ALLEN BRADLEY 161930 161930
ALLEN BRADLEY 160-BA10NSDN2 160BA10NSDN2
ALLEN BRADLEY 160-BA06PSF1 160BA06PSF1
ALLEN BRADLEY 160-BA06NPS1P1 160BA06NPS1P1
ALLEN BRADLEY 160-AA04NSF1P1 160AA04NSF1P1
ALLEN BRADLEY 151134 KIT PCB BASE DRIVER/POWER SUPPLY * IN A BOX*
ALLEN BRADLEY 150-SCMD 150SCMD
Allen Bradley 150 A240 NBD Series B SMC
Allen Bradley 1494GBC3N420 **GENUINE** AB 1494G BC3N 420
Allen Bradley 1492-CE6 Terminal Block 1492CE6 Series B (Pack of 24)
ALLEN BRADLEY 140U-H6C3-D10-A-MT SERIES B CIRCUIT BREAKER ASSEMBLY,
ALLEN BRADLEY 1398-DDM-005X 1398DDM005X
ALLEN BRADLEY 1398-DDM-005 SERIES A SERVO DRIVE * IN A BOX*
ALLEN BRADLEY 1394C-AM07 1394CAM07
ALLEN BRADLEY 1392-A050-RB-MC-B-F2 3PHASE 220/230V-AC 29A MOTOR DRIVE B245220
Allen Bradley 1391-AA15 Servo Control Drive大连西门子授权一级代理商通讯电缆供应商采购

德国西门子（SIEMENS）公司生产的可编程序控制器在我国的应用也相当广泛，在冶金、化工、印刷生产线等领域都有应用。西门子（SIEMENS）公司的PLC产品包括LOGO、S7-200、S7-1200、S7-300、S7-400等。 西门子S7系列PLC体积小、速度快、标准化，具有网络通信能力，功能强，可靠性高。S7系列PLC产品可分为微型PLC（如S7-200），小规模性能要求的PLC（如S7-300）和中、要求的PLC（如S7-400）等。
      当PLC投入运行后，其工作过程一般分为三个阶段，即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在整个运行期间，PLC的CPU以一定的扫描速度重复执行上述三个阶段。
输入采样
       在输入采样阶段，PLC以扫描方式依次地读入所有输入状态和数据，并将它们存入I/O映象区中的相应得单元内。输入采样结束后，转入用户程序执行和输出刷新阶段。在这两个阶段中，即使输入状态和数据发生变化，I/O映象区中的相应单元的状态和数据也不会改变。因此，如果输入是脉冲信号，则该脉冲信号的宽度**大于一个扫描周期，才能保证在任何情况下，该输入均能被读入。
      用户程序执行
      在用户程序执行阶段，PLC总是按由上而下的顺序依次地扫描用户程序（梯形图）。在扫描每一条梯形图时，又总是先扫描梯形图左边的由各触点构成的控制线路，并按先左后右、先上后下的顺序对由触点构成的控制线路进行逻辑运算，然后根据逻辑运算的结果，刷新该逻辑线圈在系统RAM存储区中对应位的状态；或者刷新该输出线圈在I/O映象区中对应位的状态；或者确定是否要执行该梯形图所规定的特殊功能指令。
    大连西门子授权一级代理商通讯电缆供应商采购