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苏州园林------苏妙玲

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从PLC控制系统与电器控制系统比较可知，PLC的用户程序（软件）代替了继电器控制电路（硬件）。因此，对于使用者来说，可以将PLC等效成是许许多多各种各样的“软继电器”和“软接线”的集合，而用户程序就是用“软接线”将“软继电器”及其“触点”按要求连接起来的“控制电路”。

 为了的理解这种等效关系，下面通过一个例子来说明。如图1所示为三相异步电动机单向起动运行的电器控制系统。其中，由输入设备SB1、SB2、FR的触点构成系统的输入部分，由输出设备KM构成系统的输出部分。

Cobra ClassIc 25NWLTD & 25LTD, RACK G G38

Vishay Capacitor 15752331, 1552331, HP1222, 330uF, Shipsameday 1549P

BUSS FUSE HOLDER, JTN60060, 35-60A, 600V, SHIPSAMEDAY115Q7

Panduit Phone Data TV Sat, Ustec, CFG4, Shipsameday1221C

SIEMENS STARTER CONTACTOR NON-REVERSING, 3RA1115-1AA15-1BB4

Square D RELAY RSD14V51, ShipSameDay W2/3 Days Shipping1622A3

AVX TAJB336K016R 

AVX TAJB336K016RNJ 

Asco Solenoid Valve 8262G260, T809440, Shipsameday Rack L L62

Swagelok CAP VCR 1/2 , SS-8-VCR-CP

Swagelok PLUF VCR 1/2 , SS-8-VCR-P & SS-4-VCR-P

Omron C200H-NC211,  SHIPSAMEDAY W/2-3days Shipping1630Z

SWAGELOK Double Male Union 1/2 VCR, SS-8-VCR-6-DM, SHIPSAMEDAY117T1

SKF EXPLODER Ball Bearing 62122ZJEM (1X) & 63072RSJEM (2X) SHIPSAMEDAY1473M1

SMC Compact Cylinder CQ2A80-70DM

HAM-LET Male Connector 1/2NPTx1/2Tube, 768LSS1/2X1/2 1654C6

Square D Miniature Circuit Breaker 30A 2P 120/240V, QOU2305283, SHIPSAMEDAY103F

8x SMC Roller Lever Pneumatic Manual Control Valve, VM131-01-01SA, 1217A5

Schneider Control Relay CA4KN22BW3, Tesys-042859, SHIPSAMEDAY 1471B6

Sinwan Fan Motor Model S109AP-11-1 Ball LR66833 

SMC CDQ2B32-40D & CQ2B25-50D & See Detail, Shipsameday 1601V

Banner Mini Beam SM312FM10, Shipsameday125B9

Comark DT20 Digital °F °C Thermometer, -40° to 300° F, SHIPSAMEDAY1171BA

SQAURE D Thermal Magnetic Circuit Breaker 80A, 1P, QOU180, SHIPSAMEDAY1171BG

SMC SOLENOID VALVE, VQZ332-5G1-C10-F, Shipsameday1646Q3

Wasco Pressure Transducer 1/8 NPT, 768-1063-103/6282, Shipsameday125C1

Wasco Pressure Transducer 1/4 VCR, SV129-31W2A/6272, Shipsameday125C2

Skinner Solenoid Valve B13DK1100, Shipsameday125C3

SAMTEC Connector Receptacle 14 Position 0.100, SSW-107-01-S-D169A6

Allen Bradley overload Relay Panel 815C0V4  shipsameday 1178ZA

Swagelok brass full flow quick connect 3/4, B-QF12-B-12PM, Shipsameday131A4

Swagelok Male Tubing Adapter SS-12-TA-1-12,  Shipsameday131A5

Swagelok Diaphragm Valve 1/2 FVCR, SS-BN8FR8-C,  Shipsameday C17

ON MBRS340T3G, Schottky Diodes & Rectifiers 3A 40V, S80

Square D Thermal Overload Realy 9065-AR0-1R, 9065-AR0-1L shipsa 1178Z

GE CR104PXG33 & CR104PXG42 & CR104PXG49, SHIPSAMEDAY, 1534A13

Pepper+Fuchs Photoelectric Sensor 905499, ShipSameDay, Rack C C91

Siemens 3ZX1012-0RT03-1AA1 & 3RH1921-1LA11, Shipsameday 137H23

Telemecanique LOAD 4/3, XS1M18PAS20D, Shipsameday 1539N

IDEAL ITB-300 ITB300 Terminal Strip 4 Circuit 70066 30A-600V,  1539H

Siemens Circuit Breaker 3VF2217-0EE41-0AA0, SHIPSAMEADAY 1611N

ASCO Red-hat Solenoid Valve Coil, 101-899-2-D

Knapp-monarch 1945 & G.G. Greene 1959 & 2 Knife & 1 

DENSEI-LAMBDA Power Supply, PSD6-12-1212,  SHIPSAMEDAY 1218Z1

Telemecanique Cummunication MODBUS Cable 3M, TSXSCYCM6030, Shipsameday 1205A

Swagelok Male Connector 3/8T X 7/16-20, SS-600-1-4ST, SHIPSAMEDAYQ18

Swagelok VCR Face Seal Fitting FEMALE NUT 1/2, SS-8-VCR-1, 118Q7

Norgren Control Valve 1/4,FNPT, T1000C3800, Shipsameday152R