1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511
1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511
1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511
1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511 1747-L511
一.PLC采用“顺序扫描,不断循环”的工作方式
1.每次扫描过程。集中对输入信号进行采样。集中对输出信号进行刷新。
2.输入刷新过程。当输入端口关闭时,程序在进行执行阶段时,输入端有新状态,新状态不能被读入。只有程序进行下一次扫描时,新状态才被读入。
3.一个扫描周期分为输入采样,程序执行,输出刷新。
4.元件映象寄存器的内容是随着程序的执行变化而变化的。
5.扫描周期的长短由三条决定。(1)CPU执行指令的速度(2)指令本身占有的时间(3)指令条数
6.由于采用集中采样。集中输出的方式。存在输入/输出滞后的现象,即输入/输出响应延迟。
二.PLC与继电器控制系统、微机区别
1.PLC与继电器控制系统区别
前者工作方式是“串行”,后者工作方式是“并行”。
前者用“软件”,后者用“硬件”。
2.PLC与微机区别
前者工作方式是“循环扫描”。后者工作方式是“待命或中断”
PLC 编程方式
PLC最突出的优点采用“软继电器”代替“硬继电器”。用“软件编程逻辑”代替“硬件布线逻辑”。
PLC编程语言有梯形图、布尔助记符语言,等等。尤其前两者为常用。
梯形图语言特点:
1.每个梯形图由多个梯级组成。
2.梯形图中左右两边的竖线表示假想的逻辑电源。当某一梯级的逻辑运算结果为“1”时,有假想的电流通过。
3.继电器线圈只能出现一次,而它的常开、常闭触点可以出现无数次。
4.每一梯级的运算结果,立即被后面的梯级所利用。
5.输入继电器受外部信号控制。只出现触点,不出现线圈。
第四节 主要技术性能
用户程序存储容量:是衡量可存储用户应用程序多少的指标。通常以字或K字为单位。16位二进制数为一个字,每1024个字为1K字。PLC以字为单位存储指令和数据。一般的逻辑操作指令每条占1个字。定时/计数,移位指令占2个字。数据操作指令占2~4个字。
每五节 PLC的分类
按结构分类:
1. 整体式:是把PLC各组成部分安装在一起或少数几块印刷电路板上,并连同电源一起装在机壳内形成一个单一的整体,称之为主机或基本单元、小型、超小型PLC采用这种结构。
模块式:是把PLC各基本组成做成独立的模块。中型、大型PLC采用这种方式。便于维修。
1 NEW WESTINGHOUSE ARPT-200 TIMING MODULE NNB
WESTINGHOUSE UNBALANCED PHASE MODULE # PUM-1
WESTINGHOUSE HEATER CURRANT MODULE # HTM36
WESTINGHOUSE HEATER CURRANT RATING MODULE # HTM34
WESTINGHOUSE HEATER CURRANT MODULE # HTM28
WESTINGHOUSE NL-1005 REV 13 NUMA LOGIC INPUT MODULE 56923
NEW WESTINGHOUSE HTM05 CURRENT RATING MODULE MODEL B MOR RELAY 1D89108G05 57294
NEW WESTINGHOUSE HTM06 CURRENT RATING MODULE MODEL B MOR RELAY 1D89108G06 57295
WESTINGHOUSE 233P746H01F PROTECTION CIRCUIT BOARD MODULE 54794
Westinghouse WBNOC, WBN0C Bell Alarm Module, New Old Stock
** NEW ** WESTINGHOUSE * HTM-05 * CURRENT RATING MODULE MOR RELAY
WESTINGHOUSE NL-1076 NUMA-LOGIC RACK BUS EXPANDER EXPANSION MODULE 54358
WESTINGHOUSE WPBFV1 Full Voltage status module
HTM-14 Westinghouse MOR Relay Current Rating Module
NIB WESTINGHOUSE HTM-05 1D89108G05 MOR RELAY CURRENT RATING MODULE (B10)
WESTINGHOUSE 1D89108G26 RELAY CURRENT RATING MODULE *XLNT*
New Westinghouse HTM-01 Mor Relay Current Rating Module
Westinghouse POW-R-BLOK F 5P8-78 8511 Thyristor Diode Module Powerex
WESTINGHOUSE HTM-03 HEATER MODULE ****XLNT****
WESTINGHOUSE 7379A92G02 CIRCUIT CARD - USED - 60 DAY RETURN POLICY
Westinghouse PLC Rack & Cards NL-731s 710 708 735 Used
WESTINGHOUSE 3359C62G03 ROD CONTROL SYSTEM DECODER CARD
WESTINGHOUSE 3360C94G01 ROD CONTROL SYSTEM COUNTER CARD
WESTINGHOUSE 3359C62G01 ROD CONTROL SLAVE DECODER CARD
WESTINGHOUSE 3359C62G02 ROD CTRL SLAVE CYC DECODER CARD
Westinghouse Digital Output PC Card 2840A79G0 / 3A99162G0
Westinghouse Servo Driver PC Card 2840A78G01 / 4QSD14 SUB Y
WESTINGHOUSE LOGIC 3084A38G0 REGULATOR PLC CONTROL BOARD CARD MODULE 42143
WESTINGHOUSE 717A004G01 FM-1 REV-1 PLC CONTROL BOARD MODULE CARD 42144
BIT 3 COMPUTER WESTINGHOUSE PC CIRCUIT BOARD CARD 444-202 82402025 82402022
BIT 3 COMPUTER WESTINGHOUSE PC CIRCUIT BOARD CARD 444-202 8240202 82402022
Westinghouse Circuit Card 2D66621G0 (3138)
WESTINGHOUSE 1870A82 233P747HO1D CIRCUIT BOARD CARD
WESTINGHOUSE GATING MODULE 235P663H01B 1932A71 PLC CARD
WESTINGHOUSE CIRCUIT BOARD/CARD 1883A55 233P748H01A
WESTINGHOUSE GATING MODULE 235P663H01A 1932A71 PLC CARD
WESTINGHOUSE GATING MODULE 235P663H01C 1932A71 PLC CARD
WESTINGHOUSE TEST MODULE 235P648H01B 1912A38 PLC CARD
WESTINGHOUSE 235P719H01C 1932A71 GATING MODULE CIRCUIT CARD BOARD PC PLC 58566
WESTINGHOUSE 212P105H01B 1562A63 VC FET BOARD CARD MODULE 51940
Westinghouse PLC Card NL-708 24VAC/DC Input
WESTINGHOUSE 223P718H01A CIRCUIT BOARD CARD
WESTINGHOUSE MOD 80 1900A81 CIRCUIT BOARD CONTROL MODULE PLC CARD 54523
Westinghouse 5281C58H01 Data Plus Data Card #20637
Lot of 2 White Westinghouse 1D77496H01 Processor Drive Board Circuit Card
WESTINGHOUSE 1745A48 227P672H0ID CEMF SENSOR BOARD MODULE CARD 58594
WESTINGHOUSE 1326A12G01 VOLTAGE SENSOR CARD CIRCUIT BOARD MODULE 58592
1925 Westinghouse Historic 54+ Magnificent Joker VTG Rare Playing Cards Nr Mint
WESTINGHOUSE VECTROL CONTROL BOARD CARD VPH1019-208/416-1X1 VPH10192084161X1 NEW
WESTINGHOUSE 1870A95G01 CURCUIT CARD 233P745H01F
WESTINGHOUSE BOARD/CARD 2044A61G06 2044A61 180P665H01H
WESTINGHOUSE BOARD/CARD 180P665 652C220G06 652C220 G06
Honeywell Westinghouse SE 2814A Card Reader
4 Pcs Westinghouse Advertising Clock Radio Tape Measure Cards & Pen EXC
WESTINGHOUSE CH 199P910H01B POWER SUPPLY CIRCUIT CARD BOARD 1326A10G01 58560
WESTINGHOUSE NLT302 EXTENDER CARD 250C395H02
NEW WESTINGHOUSE 683A332G01 683A332 G01 PO-1 PCB BOARD CARD MODULE PLC 42113
LOT 10 Westinghouse Honeywell SE1060 Command Key Card
WESTINGHOUSE 5275C78G01 NETWORK INTERFACE CARD
WESTINGHOUSE 233P735H01D 1870A87 CIRCUIT BOARD / CARD
WESTINGHOUSE FLT IND/SIG DET MODULE 1870A87 BOARD CARD
WESTINGHOUSE FLT IND/SIG DET MODULE 1870A87 CARD H08B
Westinghouse 2814A Card Reader Sensor Alto 818SX
1959 Ad Westinghouse Engineer F. Willard Card Machine - ORIGINAL ADVERTISING
Vintage Metal PPG & Westinghouse Employee ID Cards Set.
Westinghouse Dryer Ad 1951 LOCAL Iowa City Bus Placard 28" x 11" Stiff Card
Westinghouse RANGE Ad 1951 LOCAL Iowa City Bus Placard 28" x 11" Stiff Card
Westinghouse Refrigerator Ad 1950s Iowa City Bus Placard 28" x 11" Stiff Card
WESTINGHOUSE PLC CARD CAT#235P648H01B TESTED
WESTINGHOUSE PLC CARD CAT#233P734H01J TEST AND GOOD
2009 Topps Mayo Harvard George Westinghouse 10/25
1939 WESTINGHOUSE ELEC BLD NY WORLD'S FAIR POST CARD
Westinghouse Electric Vintage 2 Sets Playing Cards Comp
George Westinghouse 1930 Antique Cards Inventor
Charles Goodyear, George Westinghouse 1926 News Card
Westinghouse NB-14w2 Modem Card Board 76G060820-00
George Westinghouse 1965 British Tea Card
Westinghouse NB-14w2 Wireless WIFI Card E150630 TESTED
Westinghouse NB-14w2 Mini Card Cover Door 83GX40091-30
Westinghouse NB-14w2 Internal WIreless WiFi Card
Westinghouse NB-14w2 Mini Card Cover Door 83GX40091-30
LAUNDRY WESTINGHOUSE LAUNDROMAT 1959 ADVERTISING CARD
Post Card Birds Eye View of Westinghouse Electric PA
Westinghouse NB-14w2 Modem Card Board 76G060820-00 Jack
Westinghouse NB-14w2 Modem Card Board 76G060820-00
Westinghouse NB-14w2 Modem Card Board 76G060820-00
Vintage Swap Playing Card Westinghouse Mazda Lamps 1920's LADY Ladies
GEORGE WESTINGHOUSE / LIV TYLER Actress - Vintage 2000 Trivia Board Game Card
1994 Big 33, FRANK LOCKETT, Temple Uni. & Westinghouse HS
VINTAGE SINGLE Swap/Playing Card -1 Single Westinghouse/Mazda Lamps advert
Cabinet Card Adorable Baby Girl ID'd Laura E Westinghouse Happy
GEORGE WESTINGHOUSE Air Brake STORY OF AMERICA 2 CARDS
2009 Topps Mayo Silver George Westinghouse entrepren.
2009 Topps Mayo #104 George Westinghouse entrepren.
George Westinghouse Air Brake Train Photo History Of America Card
2009 Topps Mayo #104 George Westinghouse
Pittsburgh Pennsylvania PA Westinghouse Bridge Postcard Old Vintage Card View PC
Pittsburgh Pennsylvania PA Westinghouse Bridge Postcard Old Vintage Card View PC
VINTAGE PLAYING CARDS NON STANDARD LIBERTY CARDS USA WESTINGHOUSE CREDIT CORP A1
Location: United Kingdom
Returns: Accepted
#27 How the westinghouse compressed air brake works - Railway Equipment R Card
Location: United Kingdom
Returns: Accepted
#43 the westinghouse brake george westinghouse card
Location: United Kingdom
Westinghouse Servo Driver PC Card 2840A78G01 / 4QSD14 SUB Y
TECO WESTINGHOUSE DRIVE 75HP/128A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 60HP/96A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 50HP/80A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 40HP/130A, 230V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 40HP/64A, 460V 3 PHASE NEMA 1
Westinghouse 015-000886-0005 AF5000 Base Drive Board
This item includes a
TECO-WESTINGHOUSE GA7200-4050-N1 DRIVE 50HP 80A ***NNB***
TECO-WESTINGHOUSE MA7200-4025-N1 DRIVE 25HP 24A ***NIB***
TECO WESTINGHOUSE DRIVE 30HP/48A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 30HP/96A, 230V 3 PHASE NEMA 1
WESTINGHOUSE GEAR DRIVE LIFE LINE T MOTOR 25HP NEW
TECO WESTINGHOUSE DRIVE 20HP/64A, 230V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 20HP/32A, 460V 3 PHASE NEMA 4
Westinghouse Accutrol 30" Breaker Drive Bucket , 2 Hp
TECO WESTINGHOUSE DRIVE 15HP/24A, 460V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 15HP/48A, 230V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 25HP/40A, 460V 3 PHASE NEMA 1
new 60hp soft easy start vfd ac drive 575 600 480v EJ068-5ER westinghouse
TECO WESTINGHOUSE DRIVE 25HP/80A, 230V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 20HP/32A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 10HP/15A, 460V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 20HP/64A, 230V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 10HP/32A, 230V 3 PHASE NEMA 4
Westinghouse 4D14887G01 AF97 Gate Drive Board Assembly
TECO WESTINGHOUSE DRIVE 7.5HP/12A, 460V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 7.5HP/24A, 230V 3 PHASE NEMA 4
UNUSED WESTINGHOUSE GEAR DRIVE 25HP RATIO 17.1
Westinghouse Accutrol 110 AC Drive 7.5 HP 13 AMP VFD CT4071 *XLNT*
TECO Westinghouse MA7200-4030-N1 41KVA 30 HP VS Drive 380-480V MA72004030N1
TECO Westinghouse MA7200-4020-N1 27.4KVA 20 HP VS Drive
TECO WESTINGHOUSE DRIVE 15HP/48A, 230V 3 PHASE NEMA 1
TECO-WESTINGHOUSE GA7200-4025-N1 DRIVE 25HP 24A ***XLNT***
TECO WESTINGHOUSE DRIVE 15HP/24A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 5HP/8.7A, 460V 3 PHASE NEMA 4
Westinghouse 9075A10G12 Rev 13 Enhanced PWM Drive Board
TECO WESTINGHOUSE DRIVE 5HP/17.5A, 230V 3 PHASE NEMA 4
WHITE WESTINGHOUSE 2D66621G01 BASE DRIVE BOARD *XLNT*
Westinghouse 015-001054-0001 BASE DRIVE BOARD FOR AF5000 (400/600HP)
TECO WESTINGHOUSE DRIVE 10HP/32A, 230V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 3HP/9.6A, 230V 3 PHASE NEMA 4
CT4201, Westinghouse AC Drive
Westinghouse Base Drive Board for Accutrol
TECO WESTINGHOUSE DRIVE 7.5HP/12A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 3HP/4.8A, 460V 3 PHASE NEMA 4
Teco-Westinghouse FM100-405-N1 AC Drive 5HP 460V
TECO WESTINGHOUSE DRIVE 7.5HP/24A, 230V 3 PHASE NEMA 1
WESTINGHOUSE DRIVE INVERTER 120A 120 AMP A 230/460 ES120-4EC-11243 ES1204EC11243
TECO WESTINGHOUSE DRIVE 1HP/2.6A, 460V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 2HP/6.4A, 230V 3 PHASE NEMA 4
TECO WESTINGHOUSE FM100-405-N1 FLUXMASTER (5 HP DRIVE)
TECO WESTINGHOUSE 10 HP FM 100 FLUXMASTER AC V F DRIVE
TECO WESTINGHOUSE DRIVE 1HP/4.8A, 230V 3 PHASE NEMA 4
TECO WESTINGHOUSE DRIVE 2HP/4A, 460V 3 PHASE NEMA 4
TECO WESTINGHOUSE FM100-405-N1 FLUXMASTER (5 HP DRIVE)
TECO WESTINGHOUSE DRIVE 5HP/8.7A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 3HP/4.8A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 2HP/4A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 1HP/2.6A, 460V 3 PHASE NEMA 1
TECO WESTINGHOUSE DRIVE 3HP/9.6A, 230V 3 PHASE NEMA 1
Teco/Westinghouse AC Drive 5 HP MA7200-4005-N1
WESTINGHOUSE B1-39650-9D 12.316:1 MODULINE GEAR DRIVE ,REPAIRED
TECO WESTINGHOUSE DRIVE 2HP/6.4A, 230V 3 PHASE NEMA 1
Westinghouse drive rebuilt P/N 2D6621G03
Westinghouse Drive Board P/N 2D66621G03
New TECO Westinghouse FM100 Adjustable Speed Drive FM100-402-N1 2HP 460V 3.8A
TECO WESTINGHOUSE DRIVE 1HP/4.8A, 230V 3 PHASE NEMA 1
TECO-Westinghouse MA7200-2005-N1 Adjustable Speed Drive
TECO-WESTINGHOUSE FLUXMASTER 500 FM0500-5-0010-3400 ADJUSTABLE SPEED DRIVE 43568
TECO-WESTINGHOUSE FM100-401-N1 DRIVE ***XLNT***
New TECO Westinghouse MA7200 Adjustable Speed Drive MA7200-4002-N1 2HP 460V 4A
TECO WESTINGHOUSE AC DRIVE
New! Westinghouse Buffalo PEC Power 1279A68G01 Drive PS
Lot of 2 White Westinghouse 1D77496H01 Processor Drive Board Circuit Card
WESTINGHOUSE 683A272G02 683A272 G02 LOGIC CONTROL DRIVE BOARD MODULE PLC 43040
WESTINGHOUSE 684A101G01 683A101 G01 LOGIC CONTROL DRIVE BOARD MODULE PLC 43039
Schlinder Westinghouse RH Drive Block PT # 5194D85G01
TECO WESTINGHOUSE MA7200-2005-N1 DRIVE, USED
Westinghouse 5041601100 DVD Multimedia Drive Tv Model WESTINGHOUSE LTV-40W1
Westinghouse Drive Module Style 1870A77 # 233P739H01F
Vtg/Antique Westinghouse Mazda Lamps-Drive Sanely Tin
Westinghouse Air Compressors Chain Drives Steam Heating, Marine engines
Westinghouse Turbines Mechanical Drive Type AMD Manual
1992 Press Photo Westinghouse Kiwane Garris drives by Kints #12 Harold Mapp
Westinghouse NB-14W2 Laptop DVD-RW CD-RW Writable Burner Drive
PAIR OF VINTAGE WESTINGHOUSE DRIVING / FOG LIGHT W MOUNTING BRACKETS
Westinghouse Schindler Elevator 196C269G01 Escalator Timing Drive Pulley - NEW
Westinghouse NB-14w2 HDD Hard Drive Caddy
Westinghouse NB-14w2 Optical Drive Board 35GPX4010-C0
131475100 FRIGIDAIRE WESTINGHOUSE WASHER DRIVE HUB NEW
WESTINGHOUSE SMALL TURBINES FOR ELECTRIC DRIVE on CD
Westinghouse NB-14w2 HDD Hard Drive Caddy
1945 Print Ad Westinghouse Uncle Sam Wind Tunnel Drives
Westinghouse NB-14w2 Optical Drive Connect 35GPX4010-C0
Westinghouse NB-14w2 Optical Drive Connect 35GPX4010-C0
Westinghouse NB-14w2 Optical Drive Connect