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在现代化的工业生产设备中，有大量的数字量及模拟量的控制装置，例如电机的启停，电磁阀的开闭，产品的计数，温度、压力、流量的设定与控制等，而PLC技术是解决上述问题的有效、便捷的工具，因此PLC在工业控制领域得到了广泛的应用。下面就PLC工业控制系统设计中的问题进行探讨。

2 PLC系统设备选型

PLC主要的目的是控制外部系统。这个系统可能是单个机器，机群或一个生产过程。不同型号的PLC有不同的适用范围。根据生产工艺要求，分析被控对象的复杂程度，进行I/O点数和I/O点的类型（数字量、模拟量等）统计，列出清单。适当进行内存容量的估计，确定适当的留有余量而不浪费资源的机型（小、中、大形机器）。并且结合市场情况，考察PLC生产厂家的产品及其售后服务、技术支持、网络通信等综合情况，选定价格性能比较好的PLC机型。

FRAM ALLIED SIGNAL G6346

FRAM ALLIED SIGNAL G7398

FRAM ALLIED SIGNAL G7759

HONEYWELL MICRO SWITCH BE 2RV193 A4 25 Amp 125 250 480 VAC

HONEYWELL MICRO SWITCH Z 15GD B7 K 15 AMP 125 250 480 VAC

PHOENIX CONTACT VS 08 ST RJ45

BUSS COOPER BUSSMAN Double Fuse Block 30 Amp 600V BCA6032PQ MT

OMRON LY4N 24 VAC

CARRIER BRYANT PAYNE HR 54ZA 001 ON OFF

FURNAS HARNISCHFEGER P&H Heater Thermal Overload Relay Element E53 480Z5D53

ARROW HEART Heater Overload Relay Thermal Element 42006

ARROW HEART Heater Overload Relay Thermal Element 42000

HUBBELL CHANCE M20KA23 Type K 20 AMP

HUBBELL CHANCE M15KA Type K 15 AMP

HUBBELL CHANCE M25KA Type K 25 AMP

ALTECH CORP TEKNIC S2 1 NC

HUBBELL CHANCE M30TA23 Type T 30 Amp

HUBBELL CHANCE M65KA23 Type K 65 Amp

CATERPILLAR CAT 6I 1936

CATERPILLAR CAT 5T 6292 Steel Shaft D20M67Y05P4718

CATERPILLAR CAT 742-1 Metal

CATERPILLAR CAT 238 8363 Rubber Boot Seal D29M07Y09P4723

CATERPILLAR CAT 121 9842 PIN AS Pin Assembly with Clip D17M03Y09P477

RED LION CONTROLS BMK20000

UNIVERSAL PARTS CARRIER KC 21AH 005 Brush

CARRIER Micro Temp HH 12 680002 30 AMP

UNIPART BDP PARTS CENTER 73061 BP4

ITE GOULD TELEMECANIQUE G30T23

FUSETRON COOPER BUSSMANN Fuse 600V 15 Amp FRS R 15

FLEXCO HSP3 31980 FGB1 Blade 69 7598 Blelt Cleaner

ABB OHB I AHI P0840 OH_H Black ON OFF Selector Switch Handle ISCA022364R6340

EUCLID HITACHI E12613422

General Electric CR123 H090A

General Electric CR123 H188A










General Electric CR123 H120A

General Electric CR123 H486A

General Electric CR123 H267A

Sprecher & Schuh KT3 25 PA 11

Joslyn Clark Clark Sylvania 2532

HOFFMAN A-S100 A S100 Enclosure Hole Seal 1" DNB 783510 59730 10326

General Electric CR123 H377A

Phoenix Contact 17 71 20 2 Male Plug 16 Amp 500-600 V

LITTELFUSE JLLS 15 600V 15A Class T POWR GARD Fuse 200 KA HRCI-T ND87-50 L3B15F

NEWARK 34F870 POMONA 1296 BNC

POMONA 3534 BNC M-F 50 Ohm

PASTERNACK PE 9269 BNC

KOPEX THOMAS BETTS CF-23 Liquatite 1" NPT

CUSTOM CONNECTOR Relay Base 10 Amp 600V 11 Pin RB11

HONEYWELL MICRO SWITCH Lever Action Limit Switch YA 2RL37

Eaton 8943K28 Push Off Push On Switch 3 Amp 250V 6 Amp 125V 9724

BINDER 715 2 99 1436 820 05 Male 5 Pin Connector 3805589142

ITE GOULD Telemecanique G30T16

ITE GOULD Telemecanique G30T60

ITE GOULD Telemecanique G30T13

LITTLE FUSE Indicator Power Gard Fuse 40 Amp FLNR 40 ID

GROUPE SCHNEIDER Magnecraft 782XBX2C 120A DPDT 10 Amp 120V P827590E8

ALTECH CORP TEKNIC S1 1NO

IDEC IZUMI RR2P-UL-DC24V 8 Pin Relay 24 VDC 67305

ASHCROFT DRESSER 20W1005 H 02L 0-60 PSi 1/4 NPT

LITTELFUSE FLSR 15 ID Powr Gard 75-600V 15 Amp Fuse L6K15F

FINDER 60 12 8 024 Octal 8 Pin 10 Amp 24 VAC

HUBBELL RACO 3513-8 Heavy Duty 3/4"

CUI STACK 41 12 300C EIA 363 9940

ABB 1SFA611612R1010 Microswitch Contact Block MCBL 10

HONEYWELL MICRO SWITCH 9238 LSZ51D

ANDERSON JR SMH SB 50 Grey Battery Connector 10-12

PASS & SEYMOUR IG 6300 125 V 20 Amp

FINDER 65 31 8 120 0300 30 Amp 120 V

LUMBERG RKWT4 3B 1915 4 Pin

SMH PREMIER PARTS N15HI 00 SY6331G1 50 Red 6

LEGRAND PASS & SEYMOUR 3780 SC

L COM CSMUAB 3M Grey USB 9.84 Computer Cable 093 104820

L COM CSMUAB 5M Grey USB 16.4' Computer Cable 156818 0644

PASS SEYMOUR LEGRAND WPB25 BR

TECUMSEH 32434

FINDER 90.02 10 Amp 2 CO DPDT Relay Base Socket 90 02

MAGNECRAFT 70 784D14 1 70 784D 1 16 Amp 300V Relay Base CAT 358294 DBT35829

HUBBELL HBL2320 L620R 250 V 20 Amp

General Electric G E TRK16B Fusing Kit Class R 30 amp 600V

FUJI ELECTRIC CP S2C

FERRAZ SHAWMUT ULTRA SAFE Fuse Holder 30 Amp 600 V USCC1I X213943

ON Q LEGRAND Purple RCA to F White Connector WP3466 WH










ARROW HART L5-30 125 V 30 Amp

ARROW HART L6-20 250 V 20 Amp

FINDER 62.33.8.120.0000 16 Amp 120 VAC 62 33 8 120 0000

PASS SEYMOUR LEGRAND Weatherproof Gang Cover Switch & Single Receptacle CA17 G

PASS SEYMOUR LEGRAND L2030 RBC 20 Amp 30 Amp

TELEMECANIQUE Operating Key ZCK Y07

Furnas H6 Thermal Overload

BUSS HAC R 100 250V Current Limiting RK5 100 Amp

FERRAZ SHAWMUT 20328 30 Amp 250V

LEVITON 5206 Black 3 Pole 3 Wire 50 Amp 125-250V

LITTELFUSE FLSR 5 ID 600VAC 5 Amp

HUBBELL SHC1024 CTJ

INA WA12IAGER SCE2412 6009808 1.500

MULBERRY 97101

BUSSMANN X22 REN 30

LEVITON 2320 965 BRY 70620FR AH 6210 2 Pole Black 20 Amp

FURNAS M18 Heater

General Electric G E GPAPT1E Terminal Protection Cover Style E Use with GPS1BH