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2.1plc的定义plc称为可编程序控制器,它是按照成熟而有效的继电器控制概念和设计思想,利用不断发展的新技术、新电子器件,逐步形成了具有特色的各种系列产品,是一种数字运算操作的电子计算机。它是将逻辑运算,顺序控制,时序和计数以及算术运算等控制程序,用一串指令的形式存放到存储器中,然后根据存储的控制内容,经过模拟,数字等输入输出部件,对生产设备和生产过程进行控制的装置。
2.2plc的发展历程1969年dec公司按照gm(美国通用汽车公司)的要求研制了上第1台plc并且在gm公司得到成功的应用。此后公司使plc商品化。plc是专门设计出来用于同继电器产品竞争并逐步取代了传统的继电器。plc作为一种工业计算机,经历了以下几个发展的历程。
1969-1972为第1阶段,是plc的初期阶段,在该阶段的各厂家的plc差别很大、没有统一的硬件和软件标准、功能简单、性强,硬件主要以分离元件为主,体积较大、性能较差、可靠性不高。
1972-为第二阶段,在该阶段plc逐步演化为一种的工业计算机,可靠性大大提高,成本大幅度降低,面向过程的梯形图和语句表语言面世,系统逐步向标准化过渡,这些都为plc的普及奠定了基础。
1981-至今,iec正式发表了plc的标准,各厂家的plc都向规范化发展。梯形图、语句表、sfc语言已经成熟,同时还有和编程语言的接口,其存储能力、运算速度、对模拟量的处理功能已经大大加强,现在的大中型plc已经具有以前dcs所“特有”的经典pid算法、斜坡函数、自适应算法、模糊控制等算法。
PEPPERL + FUCHS 217956 RLG28-55/40A/115B/136
GENERAL ELECTRIC FUSE GE EJ-2 6R AMP 328L493G19
GENERAL ELECTRIC GE CIRCUIT BOARD 444A399759-G01
HOFFMAN CSD16126W C-SD16126W
SMC Valve VFS5510-5DZ
GENERAL ELECTRIC IS200ATBAG1BAA1 6BA00
ABB YPH 105A, YT204001-DY/2 Digital Speed Input YT 204001-AU
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Keyence Corp VT-5SB 1136010
NTN BEARING 22220BKD1 NEW IN BOX
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Women's Native Inlay Cowgirl Boot Snip Toe 09-021-7622-0123 BR sz 9 B
HORNER ELECTRIC PLC RELAY MODULE 45C-RLYC HE45C-RLYC
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RELIANCE ELECTRIC 0-51845-2
General Electric GE DSI Board Card 193X637ACG04
FAIRCHILD Electro-Pneumatic Transducer TA6000-401
SMC VALVE MANIFOLD EX120-SMJ1 VVQ1000-10A-1 VQ1301R-5
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ALLEN BRADLEY AXIS MODULE 2094 9A 2094-AM01
TRANSITION NETWORKS SISTM1013-162-LR SISTM10XX-162 6-PORT
Advanced Motion 12A8M-INV
Drive Textron Cone Drive Gear Speed Reducer MH015A906-1-05 MH015A906 Opt 01 5:1
Drive Textron Cone Drive Gear Speed Reducer MH015A906-2-05 MH015A906 Opt 01 5:1
Compumotor Corp Motor Drive Controller M5710211 C-B
RELIANCE AUTOMAX PLC 4 SLOT RACK CHASSIS 45C911
Phoenix Contact UM-8REL/SI/21/14/PLC
GENERAL ELECTRIC GE CIRCUIT BOARD IC600YB923A
BF Goodrich ionics Systems, 501-1826-01 501182601 MAG-300A
Honeywell Temperature Controller 51-51-25-07 DC3002-0-22A-1-DIN-0111
Honeywell Temperature Controller YDC3002-0-22A-1-00-0111 51-51-25-07 51-51-99-25
RELIANCE ELECTRIC NETWORK COMMUNICATIONS 57404-2 57C404A
FANUC A860-0320-T111 2000P
Martin Sprocket Stainless Steel 40B30SS SS40B30X012K 3/4" 3/4
SIEMENS MILLTRONICS PROBE 7MH71431AA50 1P7MH7143-1AA50 TSP33 Z1003261
SMC VALVE SLIDE TABLE SHOCK ABSORB MXS16L-20B
ALLEN BRADLEY OVERLOAD RELAY 592-EC2PC
Gemco Quik-set II Control Panel 1988-2401JB
FISHER ROSEMOUNT POWER SUPPLY BOARD CARD PWA 01984-1460-0003 REV. J/AE
HEINEN ELEKTRONIK PC BOARD PIOE12
12" Long 2" ID Stainless Steel Flexible Coupling 2150 F316 316 SA182 B16.5 SS
Flow components 12" Long 2" ID Stainless Steel Flexible Coupling 304 SA182 B16.5
CINCINNATI MILACRON CIRCUIT BOARD, 3-711-2108G
FISHER ROSEMOUNT POWER SUPPLY BOARD PWA 01984-1460-0003
Eaton Dynamatic 15-871-2 25HP/50HP
Rexroth 1" Filter R432003067 AS5-FRE-N034-GAU
Rexroth 1" Filter R432003072 AS5-FRE-N100-GAU
SICK PROXIMITY SENSOR WL32-01