福建中立恒自动化设备有限公司
目前,世界上有200多个厂家生产可编程序控制器产品,厂家有德国的西门子,美国的Rockwell(AB)、通用(GE),日本的三菱、欧姆龙,法国的施耐德等。
可编程序控制器总的发展趋势是向高集成度、小体积、大容量、高速度、易使用、高性能方向发展。具体表现在以下几个方面:
(1)向小型化、专用化、低成本方向发展
20世纪80年代初,小型PLC在价格上还高于小系统用的继电器控制装置。随着微电子技术的发展,新型器件大幅度的提高功能和降低价格,使PLC结构更为紧凑,功能不断增加,将原来大、中型PLC才有的功能移植到小型PLC上,如模拟量处理、数据通讯和复杂的功能指令等,但价格不断下降,真正成为继电器控制系统的替代产品。
(2)向大容量,高速度方向发展
大型PLC采用多微处理器系统,有的采用32位微处理器,可同时进行多任务操作,处理速度提高,特别是增强了过程控制和数据处理的功能。另外,存储容量大大增加。
(3)与计算机联系密切
从功能上看,PLC不仅能完成逻辑运算,且计算机的复杂运算功能在PLC中也进一步得到利用,从结构上看,计算机的硬件和技术越来越多地应用到PLC;从语言上看,PLC己不再是单纯用梯形图语言,而且可用多种语言编程,如类似计算机汇编语言的语句表,甚至可直接由计算机语言编程;在通讯方面,PLC与计算机可直接相连并进行信息传递。
(4)发展多样化
可编程序控制器发展的多样化体现在3个方面:产品类型、编程语言和应用领域。
(5)模块化
PLC的扩展模块发展迅速。功能明确化、专用化的复杂功能由专门模块来完成。主机仅仅通过通讯设备向模块发布命令和测试状态,这使得PLC的系统功能进一步增强,控制系统设计进一步简化。
(6)网络与通讯能力增强
计算机与PLC之间以及各个PLC之间的联网和通讯的能力不断增强,使用工业网络可以有效地节省资源、降低成本、提高系统可靠性和灵活性,致使网络的应用有普遍化的趋势。
(7)多样化与标准化
生产PLC产品的各厂家都在大力度地开发自己的新产品,以求占据市场的更大份额。因此产品向多样化方向发展,出现了欧、美、日多种流派。与此同时,为了推动技术标准化的进程。一些国际性组织,如国际电工委员会(IEC)不断为PLC的发展制定一些新的标准,如对各种类型的产品作一定的归纳或定义,或对PLC未来的发展制定一种方向或框架。
(8)工业软件发展迅速
与可编程序控制器硬件技术的发展相适应,工业软件的发展非常迅速,它使系统应用更加简单易行,大大方便了PLC系统的开发人员和操作使用人员。
可编程序控制器的输出信号类型可以是开关量、模拟量和数字量。输出单元从广义上分包含两部分:一是与被控设备相连接的接口电路,另一部分是输出的映像寄存器。
PLC运行时CPU从输入映像寄存器读取输入信息并进行处理,将处理结果放到输出映像寄存器。输出映像寄存器由输出点相对应的触发器组成,输出接口电路将其由弱电控制信号转换成现场需要的强电信号输出,以驱动电磁阀、接触器、指示灯等被控设备的执行元件。
RUSSELSTOLL RUSSEL STOLL EVER-LOK PLUG T250AMC
WHITEY BALL VALVE SS-44F4
AKINS 2000W 240V HEATER ELEMENT EHT-0003
LEGRAND 12M OPTICAL FIBER CABLE VS 12M LC LC SM DPX 810-LL7-040
BODINE TERMINAL KIT 0984-BQ
SHOWA HAND PUMP HLA7
OF 50 WESANCO E.M.T. 1-1/2"-1-3/4" PIPE CLAMPS W-6034 STRUT
FIRESTAIR SPRING W01-358-7451
KKLE 125PSIG SIZE 2 STEAM RELIEF VALVE 6030JHM01-LM-125
SIEMENS 3-POSITION RETURN
CONTREX DIGITAL MOTION CONTROLLER ML-TRIM 230V
SIEMENS MOORE PROCESS CONTROLLER INTERFACE PANEL 15738-71R
SONPIN HYDRAULIC FILTER ELEMENT MF-04
EATON AC DRIVE REMOTE KEYPAD KEYPAD-LOC/REM
REXNORD DPK AMR 450 HHS 698210017309 410987
BLACKBURN ALUMINUM SPLIT BOLT CONNECTOR APS-350
EMERSON 120V ISOLAT 12P6543X052-200A K174061263 LS DI ISO 120VAC
OFAST MALE CONNECTOR BS-8141-0/PG9
DONALDSON AIR FILTER P524367
LOT OF (20) KSK BALL BEARINGS 6002-2RS
AM LOCK CO SELFCHECK CIRCUIT CARD LPC-155
CROUSE-HINDS AUDIBLE SIGNAL APPLIANCE 87DB. WH13523-M3
ALLEN-BRADLEY SER.A SWING ARM CONVERSION MODULE 1492-CM1771-LD014
OFAST CORDSET U2088-2 RS 4T-2/S101
ASCO 8262 AC REBUILD KIT 302018-E
DURAMETALLIC X SERIES CARTRIDGE DURA SEAL 4560173
DUFF NORTON WORM GEAR SCREW SK1820-4
TELEMECANIQUE 7-10A 690V 3-POLE OVERLOAD RELAY LR1-D09-314 LRD09314
MOORE INDUSTRIES 117VAC 5W SCT SIGNAL CONVERTER
KKLE 1/2" 73 PSI RELIEF VALVE 6010DCM01-KM73
GENUINE SKF ANGULAR CONTACT BEARING 3201-A-2RS1TN9
JEFFERSON ELECTRIC IVERSAL PRIMARY FUSE KIT 631-0000-301
LOT OF (2) BRADY LEVER OPERATED VALVE LOCKOUT DEVICES 5,415,017
SCHMERSAL 20 METER M12 8-PIN SLC CORDSET KA-0908
ABB REV.J 480V OPERATOR KEYPAD DISPLAY ACS-PAN-A
LOT OF (3) COOPER BUSSMANN 800A 690V FAST ACTING FUSE 170M4268
CONTINENTAL HYDRAULICS PILOT OPERATED CHECK VALVE C03MSV-PC-30-AA-B
ROSEMOT ANALYTICAL TRANSMITTER 1186-12
APOLLO VALVES BALL VALVE SERVICE KIT 83-058-64
HONEYWELL 6A 240V 24V COIL CONTROL RELAY HN 61KK-066 R8222D-1121
1 HONEYWELL 6A 240V 24V COIL CONTROL RELAY HN 61KK-066 R8222D-1121
BOSCH PNEUMATIC DIRECTIONAL VALVE VVST-3/2NC-PLU 0-820-402-001
BONNEY FORGE 3/4" VALVE A105N CR13 CR13.HF 127586-*051
LOT OF (325) ATLAS COPCO 2910-50** COMPRESSOR REPAIR SEALS / PARTS
NUMATICS SOLENOID VALVE 150PSIG-AIR 110/120V 031SS4002000030
SMC PNEUMATIC CYLINDER NCMW075-0150
FESTO 162512 8 BAR VACUUM GENERATOR VADM-45-P
NELES-JAMESBURY 1-1/2" BALL VALVE IMO-208 1000-CWP
SKF CR SERVICES OIL SEAL 49240
NELES PNEUMATIC POSITIONER NP-626
ALLEN-BRADLEY 110/120V COIL CONTACTOR 100-C23*10 W/ 100-F 100-FSC280
FAFNIR BALL BEARING 204PP
KRAUS NAIMER DRUM SWITCH A11-C21287
LUMENITE 2-PROBE 15"/24" LIQUID LEVEL PROBE 3DCFT2
SAN-REX POWER MODULE DIODE DF20AA160-K4C30
GARLOCK G-100 1/2" 12.7MM 1LB COMPRESSION PACKING 41894-1032
TURCK 4A 250V M12 STRAIGHT FEMALE CONNECTOR B8141-0/LABEL
GATES 10MM WIDTH TIMING BELT 3205M
SENSOR ELECTRONICS NH3 AMMONIA GAS DETECTOR SEC3000
LOT OF (3) BRANDED 316 SS 3/8" TEE FITTING 3/8-150
LOT OF (10) SWAGELOK 1/2" NPT X 1/4" TUBE BRASS HOSE CONNECTORS B-4-HC-1-8
CKD CYLINDER MOTING BRACKET M1-TA-20
SAKAE 10 TURN 3-DIGIT 1/4" SHAFT COTER DC-27B
KIP 120V SOLENOID VALVE 6X235
BROWNING 1-1/2" SHAFT 2-BOLT FLANGE MOT BEARING VS-124
PROCESS CONTROLS MAXIGARD 4" 16 MAGNETIC DISC 1136
GE 2.00 KVA 1 PH QB TRANSFORMER 9T51B0012G03
JOHNSON CONTROLS 1/2" 2W 24VAC BALL VALVE VG1245AE9A4AGA
MIL-SPEC HONEYWELL CLAROSTAT SPEED AND POSITION POTENTIOMETER RA30LASB253A
SQUARE D 110/120V PNEUMATIC TIMING RELAY 9050-AO10DV02
MCGRAW EDISON FUSE LINK 200A FL11T200
NOARK 24V COIL CONTACTOR EX9CDZ18A30BC
TURCK 10-30V INDUCTIVE PROXIMITY SENSOR BI2-M12-AN6X-H1141
ALLEN-BRADLEY OUTPUT MODULE 1734-OB8
MAC 120V 5.4W SOLENOID VALVE TM-DAAP-1DA
HUMPHREY 120V 125PSI 1/4" 3-WAY SOLENOID VALVE T062E1-3-10-35-61-80
NORTH AMERICAN MFG GAS VALVE 8697-5 4-3529 ORIFICE 2880 2-1/2" 8697-5-A2880
WEIDMULLER 24VDC DIGITAL INPUT MODULE 998744 SP-RS-PLC
SIEMENS 22KW SINAMICS V20 FILTER 6SL3210-5BE32-2UV0
TSUBAKI 50' ROLLER CHAIN 40-RIV
ROTO-FLOAT TYPE S 125/250V FLOAT SWITCH
PHILIPS 120/277V 4-LAMP BALLAST IOP-4PSP32-LW-SC
AGASTAT TIME DELAY RELAY 2412EC
ALLEN-BRADLEY 110/120V COIL CONTACTOR 100-C23*10
ALLEN-BRADLEY 110/120V COIL CONTACTOR 100-C23*10
PARTS/REPAIR REGAL REXNORD RESET/PROGRAMMABLE RTC W/CALENDAR ASSEMBLY 311-337
GE FANUC VERSA MAX MICRO CONTROLLER IC200UDD120-BG *MISSING DOORS*
BANNER 30V PHOTOELECTRIC SENSOR SM312D 25619
CUTLER HAMMER 125A CIRCUIT BREAKER HFD3125
FESTO 12A 24V M12 PLUG CONNECTOR MSSD-EB-24-LED-M12-SA
ROSEMOT -50 TO 450C TEMPERATURE SENSOR 214CRTSMB1S4E0092SL
THK CAM FOLLOWER CF18-HUUA
HORTON 5H45 AIR CHAMP PISTON 11161
YASKAWA CIRCUIT BOARD JASP-NS117 DF0300531-A0 REV. A
REXROTH 250V 10 BAR PRESSURE SWITCH 341-058-020-0
ENM 115V 2" HOUR METER T50A2
ALLEN-BRADLEY SER. B FLEX I/O ANALOG COMBO MODULE 1794-IE4XOE2
NAPA MICRO-SWITCH PRESSURE SWITCH BACK UP ALARM 730-1089
FUJI 0.15-0.24A THERMAL OVERLOAD RELAY TK-E02-24 TK22E
OMRON PROXIMITY SWITCH E2E-X2D1-N
ROSEMOT PRESSURE TRANSMITTER 1151DP5E22S2B3L4
FESTO PNEUMATIC CYLINDER DNC-15/8"-12"-PPV-A
MICRO-SWITCH 15A 480V STRAIGHT LEVER LIMIT SWITCH BZ-2RW8244-A2
NORGEN 07 SERIES 250 PSI PNEUMATIC FILTER ASSEMBLY F07-200M1MA
SIEMENS BUSBAR ADAPTER 8US1-261-5FP08
1 SIEMENS BUSBAR ADAPTER 8US1-261-5FP08
RELIANCE ELECTRIC PRINTED CIRCUIT BOARD 0-51831-6
GUARNATEED INSTRUMENTS TRANSFORMERS 800:5A CURRENT TRANSFORMER 560-801
HERCULES SPIN ON OIL FILTER ELEMENT 40-0000407
HEIDENHAIN INTERFACEPLATINE INTERFACE BOARD 313-437-04
ABB PROCESS CONTROL BOARD 086349-502
PHD 1-1/8" BORE X 1-1/2" STROKE PNEUMATIC CYLINDER AB-1-1/8X1-1/2
MITSUBISHI ELECTRIC PROGRAMMABLE CONTROLLER FX3U-80MT/ESS
GENUINE SKF BALL BEARING 3315 E/C3
MICRO-SWITCH 15A 480V SPLASH PROOF LIMIT SWITCH ASSEMBLY OP-AR
BAG OF (5) CPC CER BARB INSERT METAL QUICK DISCONNECT MC2202
SEALMASTER 5/8" BEARING INSERT SL-10
SKF SPEEDI-SLEEVE 99350
GE GENERAL ELECTRIC 115V PNEUMATIC TIME DELAY RELAY CR2820B120AA2
QTY 5 SPRAGUE 2UF 450V ALUMINUM ELECTROLYTIC CAPACITORS TVA1701
NTN 35MM X 72MM BALL BEARING 6207LLR/2AS
CINCINNATI ELECTROSYSTEMS 1-DIGIT THUMB WHEEL ASSY. 829-1-1
IFM DIFFUSE RELECTION SENSOR OGH312
IFM EFECTOR PRESSURE TRANSMITTER PT-010PSEN14-A-ZVG/US/ /W-PT2415
DWYER MAGNEHELIC 0-.50 IN OF WATER PRESSURE GAUGE 2000-0-C
BRANDED CIRCUIT BOARD 3087200 60/90
DODGE 2-3/16" SC 4 BOLT FLANGE BEARING 124215
FOR PARTS OR REPAIR RAYTEK THERMALERT TX SENSOR RAYTXSLTSFW
3D INSTRUMENTS 0-150PSI AMMONIA PRESSURE GAUGE 25104-24B81DRA
Listing SIEMENS 10A 400V N.C. SPST CONTACT BLOCK 3SB3400-0C
1 SIEMENS 10A 400V N.C. SPST CONTACT BLOCK 3SB3400-0C
NUMATICS SOLENOID VALVE I62BB400M000061