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。
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100) 1/4-20X3 #4 CARRIAGE BOLTS STAINLESS STEEL LOT OF 100
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COOK COMPRESSION ROD RING AL 1.625 204165LHU
HELWIG CARBON BRUSH HER 22.371517.1.101
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SHARPE STAINLESS STEEL LOCKING BALL VALVE 2000 CWP 250#WSP 1" 54576N
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MASTER PNEUMATIC F60-2 AIR FILTER 1/4" NPT 150 PSI 125 F
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DAYTON 3A430 3-WAY STAINLESS SOLENOID VALVE
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RENCO INDUSTRIAL ENCODER 74074-038
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ASHCROFT DURAGAUGE 30-0 inHg GAUGE 1/2" NPT
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SQUARE D 30A NON-F SAFETY SWITCH 240V TYPE 1 INDOOR 7.5 HP 3 PHASE DU321
D-LINK DSS-16 16 PORT 10/100 DESKTOP SWITCH MANAGED
D-LINK DSS-16 16 PORT 10/100 DESKTOP SWITCH MANAGED
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VIDEOJET 375038 ENCODER CABLE REV. AA 49/20 6 PIN
IVERSAL M3912/27CK-5EU-JT3 ELECTRONIC MH BALLAST 120-277VAC 39W 6 WIRE
ODRIVE MCS41AX10 MOVIDRIVE COMPACT 24V 8235708
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INTERMATIC 40 AMP ELECTROMECHANICAL TIMER 120 VAC T185
BENTLY NEVADA 3300/12-01-20-00 POWER SUPPLY MODULE
WINTERS 1/2" NPTFX 1/2" NPTF NEEDLE VALVE 1000 PSI HARD CARBON STEEL NVA6021
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AXI INTERNATIONAL WB-3 WATER BLOCK 3 MICRON FILTER SPIN-ON
SCIENCE FIRST 20-030 ELECTROMAGNET 2-1.5 VOLT D-CELL BATTERYS 40KG LIFT
ALLEN BRADLEY PRE-WIRED CABLE FOR 1746 DIGITAL I/O 1492-CABLE010X SERIES C
TYCO AREA LIGHTING RESEARCH ALR M-480 TWIST LOCK PHOTOCONTROL 420-530 VAC
HONEYWELL UPGRADE KIT MODULAR MP-ZHMU15-100
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20) HYTORC 1" BOLT REACTION WASHER 1" BOLT 316L ZRW-100-316L 20 PC
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SPIRAX SARCO 1" CAST IRON Y-STRAINER 1-IT-250
SQUARE D 30A NON-F SAFETY SWITCH 240V TYPE 1 INDOOR 7.5 HP 3 PHASE DU321