AB 1746-OV16

    在PLC系统设计时，首先应确定控制方案，下一步工作就是PLC工程设计选型。工艺流程的特点和应用要求是设计选型的主要依据。PLC及有关设备应是集成的、标准的，按照易于与工业控制系统形成一个整体，易于扩充其功能的原则选型所选用PLC应是在相关工业领域有投运业绩、成熟可靠的系统，PLC的系统硬件、软件配置及功能应与装置规模和控制要求相适应。熟悉可编程序控制器、功能表图及有关的编程语言有利于缩短编程时间，因此，工程设计选型和估算时，应详细分析工艺过程的特点、控制要求，明确控制任务和范围确定所需的操作和动作，然后根据控制要求，估算输入输出点数、所需存储器容量、确定PLC的功能、外部设备特性等，zui后选择有较高性能价格比的PLC和设计相应的控制系统。

  一、输入输出（I/O）点数的估算

   I/O点数估算时应考虑适当的余量，通常根据统计的输入输出点数，再增加10%～20%的可扩展余量后，作为输入输出点数估算数据。实际订货时，还需根据制造厂商PLC的产品特点，对输入输出点数进行圆整。

 二、存储器容量的估算

   存储器容量是可编程序控制器本身能提供的硬件存储单元大小，程序容量是存储器中用户应用项目使用的存储单元的大小，因此程序容量小于存储器容量。设计阶段，由于用户应用程序还未编制，因此，程序容量在设计阶段是未知的，需在程序调试之后才知道。为了设计选型时能对程序容量有一定估算，通常采用存储器容量的估算来替代。

   存储器内存容量的估算没有固定的公式，许多文献资料中给出了不同公式，大体上都是按数字量I/O点数的10～15倍，加上模拟I/O点数的100倍，以此数为内存的总字数（16位为一个字），另外再按此数的25%考虑余量。

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FARRAND 51 & 1/2" O.A.L. TAPE SPAR LINEAR SCALE 218052-15-1038

TOL-O-MATIC B3W LINEAR BELT DRIVE ACTUATOR WITH MOTOR, NNB

NSK 80" O.A.L. LINEAR BALL SCREW W5016-1987-C5Z 05L5-0005

INA LINEAR BEARING PR 14032 GR3, NIB

54" O.A.L. PRECISION BALL SCREW M-127

THOMSON ROUND LINEAR CASE SHAFT 25MMSOFTX1500MM?, NIB

THK CAM FOLLOWER CFH12MA / 350910 A NIB

THREAD CRAFT INC T-4073 COMMERCIAL BACKLASH BALL SCREW 50 OAL 2? DIA NIB

THOMSON ISO 9000 SUPER PILLOW BLOCK BEARING NIB SPB160PN

SAGINAW 31" LENGTH 3" DIAMETER SHAFT BALL SCREW, NO LABEL, SEE PHOTOS

LEAD SCREWS INTERNATIonAL 40" O.A.L. PRECISION BALL SCREW M447

THK 92" O.A.L. LINEAR MOTION SYSTEM YS 7F27

THREAD CRAFT INC T-6235 COMMERCIAL BACKLASH BALL SCREW 58 OAL 51 TRAV 2? DIA NIB

STAR 83.5" 28-HOLE LINEAR GUIDE RAIL 48-10-1608, RUST

94" O.A.L. PRECISION BALL SCREW C-246

DEUTSCHE STAR RUNNER BLOCK / ROLLER RAIL 1853-613-10, SEALED

20TH CENTURY MACHINE 120" O.A.L. PRECISION BALL SCREW FS-127920-2000

THOMSON A162536 LINEAR BALL BEARING, NNB

PRECISION BALL SCREW 74" O.A.L. FS127920-0800-1?268-02H1

GEORG FISCHER DOUBLE ACTING ACTUATOR 

LINEAR ROLLER BEARING LMUWF16

NUMATICCS, LINEAR ACTUATOR SH10606LB16DS3, K13409

PARKER PNEUMATIC ACUATOR VAVLE P5T-J063DHSN050 SEALED

THK KS PRECISION BALLSCREW 9D22

THK LINEAR GUIDE RAIL NIB SHS35C3SS+840L / UCG00264 101075

THK HSR55 LINEAR BLOCK BEARING

STAR LINEAR BEARING 067-20

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40" O.A.L. PRECISION BALL SCREW 89988

PARKER ORIGA SYSTEM PLUS PNEUMATIC DRIVE CYLINDER P5P00000C500-03?353 102624

DR. JOHANNES HEIDENHAIN 1840MM LINEAR ENCODER 216 750 HL

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LINMOT LINEAR GUIDE PS01-48X240 / 0150-1975 *PLUG*

NIPPON THOMPSON IKO LINEAR BEARING, LRW50 E71

HYTORK-130 ACTUATOR 120PSIG

FESTO 12 MM BORE, 270° ANGLE ROTARY ACTUATOR DSM-12-270-P-FW?-CC

REXROTH LINEAR SLIDE BEARING R182443110

INA LINEAR MOTION BEARING KH1026/P/PP

EMCOR 36" O.A.L. PRECISION BALL SCREW E-6428

INA LINEAR BEARING KH3050IPIPP

EMCOR E-6696 58" PRECISION BALL SCREW

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NB LINEAR BEARING TWA-16UU

26" O.A.L. PRECISION BALL SCREW 052243

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STAR / REXROTH 1807-203-31 236MM LINEAR ROLLER GUIDE RAIL, NNB

STAR / REXROTH 1807-203-31 LINEAR ROLLER GUIDE RAIL, NNB

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36.562" O.A.L. PRECISION BALL SCREW 80198 / C-160

THOMSON SAGINAW 17.5" PRECISION BALL SCREW A-5409

THREAD CRAFT INC T-1284 PRECISION PRELOADED BALL SCREW 41 OAL 38 TRAV NIB

BARNES INDUSTRIAL BWO35342 120694 25?" BALLSCREW, NIB

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THREAD CRAFT PRECISION BALL SCREW ?-16988

BELOIT CORP. SCREW JACK 274822D026

42" O.A.L. PRECISION BALL SCREW C-270

48" O.A.L. PRECISION BALL SCREW A-60292

STAR / REXROTH 1807-203-31 356MM LINEAR ROLLER GUIDE RAIL, NIB

THREAD CRAFT INC T-2569 COMMERCIAL BACKLASH BALL SCREW 38 OAL 30 TRAV NIB

THK LINEAR GUIDE RAIL NIB SHS-800L(GK) / UCG02891 101077

44'' LINEAR GUIDE RAIL

THOMSON INDUSTRIES, INC SUPERSLIDE SYSTEMS POSITIonING SLIDE, 37" OAL; 32" TRAV

REXROTH STAR RUNNER BLOCK/ BALL RAIL 1623-214-20 NIB

THOMPSON SUPER 24 BALL BEARING LINEAR BUSHING NIB

20TH CENTURY MACHINE 104" O.A.L. PRECISION BALL SCREW FS127920-1600

DAYTRonIC LINEAR SENSOR DS6000A

THREAD CRAFT INC T-4013 COMMERCIAL BACKLASH BALL SCREW 38 OAL 29 TRAV NIB

THREAD CRAFT INC T-5736 COMMERCIAL BACKLASH BALL SCREW 48? OAL 45? TRAV NIB

CAIPO DIS 10292 35 X 30 SCREW ACTUATOR

BELOIT CORP. SCREW JACK 274817D023-0-00?5

THREAD CRAFT T7425 74" O.A.L. PRECISION BALL SCREW CP#2.25X500x74

THREAD CRAFT INC T-1526 COMMERCIAL BACKLASH BALL SCREW 49 OAL 42 TRAV NIB

THREAD CRAFT INC T-6235 COMMERCIAL BACKLASH BALL SCREW 49 OAL 42 TRAV NIB

1244.5MM O.A.L. PRECISION BALL SCREW C-264

IKO 13-HOLE LINEAR GUIDE RAILWAY LWH 55 101018

IAI SINGLE AXIS ROBOT LINEAR ACTUATOR ISA-SXM-0-0-100?0-AQ

EMCOR 47.812" O.A.L. PRECISION BALL SCREW E-6630

FESTO 63MM BORE 500MM STROKE LINEAR DRIVE DGP-63-500-PPVA?-B

HEIDENHAIN 620MM, LINEAR SCALE LS 704

TEMPOSonIC R SERIES LINEAR-POSITION SENSOR RHT0065UD601V01

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INGERSOLL-RAND ARO 1/4 TON SERIES 7700 ROLLER CHAIN HOIST 7718E-2C10-K6

IDEAL .69-1.25D, SAE SIZE 12, CLAMP 62M12, BOX OF 10 *NEW*

AEROQUIP HOSE CUT OFF MACHINE S1104-2-1

TSUBAKI 3/4" PITCH 10FT RIVETED ROLLER CHAIN, NO. 60 *NEW*

CAMPBELL 1/4" (6MM) WIRE ROPE CLIPS, B7670439 *NEW LOT OF 5*

GALVANIZED WIRE ROPE CABLE, 3/8" 7 X 19, PARTIAL ROLL

CREFORM 200 X 42 SWIVEL CASTER W/ STOP & POLYURETHANE WHEEL, J-200S, LOT OF 2