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從PLC控制係統與電器控制係統比較可知，PLC的用戶程序（軟件）代替了繼電器控制電路（硬件）。因此，對於使用者來說，可以將PLC等效成是許許多多各種各樣的“軟繼電器”和“軟接線”的集合，而用戶程序就是用“軟接線”將“軟繼電器”及其“觸點”按要求連接起來的“控制電路”。
為了的理解這種等效關係，下面通過一個例子來說明。如圖1所示為三相異步電動機單向起動運行的電器控制係統。其中，由輸入設備SB1、SB2、FR的觸點構成係統的輸入部分，由輸出設備KM構成係統的輸出部分。
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
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