福建中立恒自动化设备有限公司
一、摘要 PLC是一种专门在工业环境下应用而设计的数字运算操作的电子装置。
它采用可以编制程序的存储器,用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令,并能通过数字式或模拟式的输入和输出,控制各种类型的机械或生产过程。PLC及其有关的外围设备都应按照易于与工业控制系统形成一个整体,易于扩展其功能的原则而设计。在工业生产的各个领域,机械加工企业为了提高生产效率,采用机械化流水作业的方式,对不同类型的零件分别组成的自动生产线。随着产品机型的更新换代,生产线承担的加工对象也随之改变,这就需要改变控制程序,使生产线的机械设备按新的工艺过程运行,而继电接触器控制器系统是采用固定接线,很难适应这个要求。大型自动生产线的控制系统使用的继电器数量很多,随着PLC的应用日益普及,其使用方法简单,便于掌握,且可靠性,抗干扰性很强,自身具有完善的功能.模块化的结构,使其在工业生产线上的应用越来越广泛。
发展趋势:1.向高速度、大容量方向发展
为了提高PLC的处理能力,要求PLC具有的响应速度和更大的存储容量。目前,有的PLC的扫描速度可达0.1ms/k步左右。PLC的扫描速度已成为很重要的一个性能指标。
在存储容量方面,有的PLC可达几十兆字节。为了扩大存储容量,有的公司已使用了磁泡存储器或硬盘。
2.向超大型、超小型两个方向发展
当前中小型PLC比较多,为了适应市场的多种需要,今后PLC要向多品种方向发展,特别是向超大型和超小型两个方向发展。现已有I/O点数达14336点的超大型PLC,其使用32位微处理器,多CPU并行工作和大容量存储器,功能强。
CONSILIUM SALWICO MCP-A MANUAL CALL POINT 5200031-01A
CONSILIUM SALWICO MCP-C 5200014-01A MANUAL CALL POINT WCP1A-R330SG-C035-01
CONSILIUM SALWICO RIOK-41 PCB CARD REV R1A
CONSILIUM SALWICO RIOK-41 PCB CARD REV R1A
CONSILIUM SALWICO SCI-A FIRE ALARM SYSTEM 5200120-00A (GB) SW VER. 1.0
CONSILIUM SALWICO SW2020 PCB CARD RIOK-40 REV.R1A
CONSILIUM SALWICO SW2020 PCB CARD RIOK-40 REV.R1A
CONTEMPORARY CONTROL SYSTEMS 8202-12 PC BOARD 820212
CONTEMPORARY CONTROL SYSTEMS S851 ENCODER INTERFACE BOARD
CONTRAVES MODEL #NC720 PART #A2272 NC700 DC SERVO DRIVE NC720 A2272
CONTREC PCB S1204D ISS.2 W084341012 1872596 / FAST SHIP DHL OR FEDEX
CONTROL CHIEF 25-02-0-010 REMOTE TRANSMITTER BOARD REV A 25020010
CONTROL CHIEF 25-02-0-010 REMOTE TRANSMITTER BOARD REV B 25020010
CONTROL CHIEF 8002-4001-02-T CIRCUIT BOARD 8002400102T
CONTROL CHIEF 8002-4009-T CIRCUIT BOARD 80024009T
CONTROL CHIEF 8002-4009-T CIRCUIT BOARD 80024009T
CONTROL CHIEF CORP. 8002-4025-01 POWER SUPPLY BOARD
CONTROL PCB EDITION 07 EZ-003CWSE-F1 WC070625R / FAST SHIP DHL OR FEDEX
CONTROL TECHNIQUES 4-20MA TANK PROBE CIRCUIT BOARD CONTROLLER 420MA
CONTROL TECHNIQUES 9500-4030 TACH BOARD 95004030
CONTROL TECHNIQUES 9500-4030 TACH BOARD 95004030
CONTROL TECHNIQUES 9500-4030 TACH BOARD 95004030
CONTROL TECHNIQUES 9500-4030 TACH BOARD 95004030
CONTROL TECHNOLOGIES 901E-2560 PC BOARD 901E2560
CONTROL TECHNOLOGIES 901E-2560 PC BOARD 901E2560
CONTROL TECHNOLOGY 901B-2550 CONTROL BOARD 901B2550
CONTROL TECNIQUES 2450-4014 PC BOARD 24504014
CONTROL TECNIQUES 2450-4014 PC BOARD 24504014
CONVERTEAM GDS1004-4002 gds1004-4002 pcb circuit
CONVERTEAM GDS1004-4002 gds1004-4002 pcb circuit
CONVERTEAM UK LTD 20X4245B1SR DRIVE POWER CONTROL CARD
COPAR CORP. 736-509 MULTIPLEXER BOARD 736509
COPAR CORP. 736-509 MULTIPLEXER BOARD 736509
COPAR CORP. 736-509 MULTIPLEXER BOARD 736509
COPAR CORP. 736-509 MULTIPLEXER BOARD 736509
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPAR USDC-X4 PC BOARD USDCX4
COPES VULCAN MEC/MC 20 COMPUTER BOARD 860670-00001
COPLEY CONTROLS 800-259 CONTROL BOARD 800259 BELL & HOWELL SE-538-00MP
COREDEL SCE222G PC BOARD
COREDEL SCE222G PC BOARD
COREDEL SCE331C PC BOARD
COREDEL SCE331C PC BOARD
CP11 ANALOG CARD 15801-003-302 PC BOARD REV. 2
CRANE CO. 1816024 PC BOARD
CRANE CO. 1816024 PC BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE CO. 910000302 CONTROL BOARD
CRANE MERCHANDISING SYSTEMS EL13059000 PC BOARD
CRANE MERCHANDISING SYSTEMS EL13059000 PC BOARD
CREO 10-4883A-C PC BOARD 17-4794B-A
CREO 10-4883A-C PC BOARD 17-4794B-A
CREO 10-4883A-C PC BOARD 17-4794B-A
CREO 10-4883A-C PC BOARD 17-4794B-A
CREO INC. 503-00011A-B ALARM BOARD 250-00015A-A
CREO INC. 503-00011A-B ALARM BOARD 250-00015A-A
CREONICS PC-129-1088 CIRCUIT BOARD PC1291088 055-100 129-519
CREOSCITEX 10-4998A-C DUAL HEAD I/F BOARD 17-4998A-A
CROMPTON 253-PHDU-SEBX-C6-EC PROTECTOR TRIP RELAY 253-PHDU
CROUZET PB-4 CIRCUIT BOARD PB4
CROUZET PB-4 CIRCUIT BOARD PB4
CROUZET XD26 DIGITAL LOGIC CONTROL MODULE 88970161 MILLENIUM 3
CROUZET XD26 DIGITAL LOGIC CONTROL MODULE MILLENIUM 3 w/ XR06 DIGITAL EXTENSION
CROWCON 96HD FLAMMABLE REPLACEMENT SENSOR S01749/A FOR S01-637-300P GAS DETECTOR
CROWCON P-5490 OXYGEN SENSOR PCB MODULE SM6372
CROWCON P-5490 OXYGEN SENSOR PCB MODULE SM6372
CROWCON TXGARD-IS OXYGEN GAS DETECTOR RGD90 SENSOR S01-169
CROWN EQUIPMENT 101702 LOGIC CARD ASSEMBLY
CROWN EQUIPMENT 101702 LOGIC CARD ASSEMBLY
CROWN EQUIPMENT 101702-00R LOGIC CARD ASSEMBLY 101702
CRYDOM 13327 INDICATOR BOARD 13327
CRYDOM 13327 INDICATOR BOARD 13327
CRYDOM MS-4 I/O MOUNTING BOARD MS4
CRYDOM MS-4 I/O MOUNTING BOARD MS4