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1 引言
PLC 控制系統(tǒng)的設(shè)計中，雖然接線工作占的比重較小，大部分工作還是PLC 的編程設(shè)計工作，但它是編程設(shè)計的基礎(chǔ)，只要接線正確后，才能順利地進行編程設(shè)計工作。而保證接線工作的正確性，就必須對PLC 內(nèi)部的輸入輸出電路有一個比較清楚的了解。
我們知道，PLC 數(shù)字輸入模塊為了防止外界線路產(chǎn)生的干擾（如尖峰電壓，干擾噪聲等）引起PLC 的非正常工作甚至是元器件的損壞，一般在PLC 的輸入側(cè)都采用光耦，來切斷PLC 內(nèi)部線路和外部線路電氣上的聯(lián)系，保證PLC 的正常工作。并且在輸入線路中都設(shè)有RC 濾波電路，以防止由于輸入點抖動或外部干擾脈沖引起的錯誤信號。
2 輸入電路的形式
2.1 分類
PLC 的輸入電路，按外接電源的類型分，可以分為直流輸入電路和交流輸入電路；按PLC 輸入模塊公共端（COM 端）電流的流向分，可分為源輸入電路和漏輸入電路；按光耦發(fā)光二極管公共端的連接方式可分為共陽極和共陰極輸入電路。如下圖1所示：
圖1 PLC輸入電路的分類
2.2 按外接電源的類型分類
2.2.1 直流輸入電路
圖2 為直流輸入電路的一種形式（只畫出一路輸入電路）。當(dāng)圖1 中外部線路的開關(guān)閉合時，PLC 內(nèi)部光耦的發(fā)光二極管點亮，光敏三極管飽和導(dǎo)通，該導(dǎo)通信號再傳送給處理器，從而CPU 認(rèn)為該路有信號輸入；外界開關(guān)斷開時，光耦中的發(fā)光二極管熄滅，光敏三極管截止，CPU 認(rèn)為該路沒有信號。
圖2 直流輸入電路
2.2.2 交流輸入電路
交流輸入電路如圖3 所示，可以看出，與直流輸入電路的區(qū)別主
要就是增加了一個整流的環(huán)節(jié)。
交流輸入的輸入電壓一般為AC120V 或230V。交流電經(jīng)過電阻R的限流和電容C的隔離(去除電源中的直流成分)，再經(jīng)過橋式整流為直流電，其后工作原理和直流輸入電路一樣，不再綴述。
圖3 交流輸入電路
從以上可以看出，由于交流輸入電路中增加了限流、隔離和整流三個環(huán)節(jié)，因此，輸入信號的延遲時間要比直流輸入電路的要長，這是其不足之處。但由于其輸入端是高電壓，因此輸入信號的可靠性要比直流輸入電路要高。一般，交流輸入方式用于有油霧、粉塵等惡劣環(huán)境中，對響應(yīng)性要求不高的場合，而直流輸入方式用于環(huán)境較好，電磁干擾不嚴(yán)懲，對響應(yīng)性要求高的場合。
2.3 按流入公共端電流的流向分類
2.3.1 漏型輸入電路
漏型輸入電路如圖4所示，此時，電流從PLC 公共端（COM端或M端）流進，而從輸入端流出，即PLC 公共端接外接DC電源的正極。
圖4 漏型輸入電路
此圖只是畫出了一路的情形，如果輸入有多路，所有輸入的二極管陽極相連，就構(gòu)成了共陽極電路。如圖5所示。
圖5 共陽極電路
三菱A系列PLC的AX40/41/42/50/60及Q系列的QX40/41/42等輸入模塊均屬于漏型輸入模塊。
2.3.2 源型輸入電路
圖3所示的電路也是源型輸入電路的形式，此時，電流的流向正好和漏型的電路相反。源型輸入電路的電流是從PLC的輸入端流進，而從公共端流出，即公共端接外接電源的負(fù)極。
如果所有輸入回路的二極管的陰極相連，就構(gòu)成了共陰極電路，如圖6所示：
圖6 共陰極電路
三菱A系列PLC的AX80/81/82及Q系列的QX80/81的輸入模塊均屬于此類輸入電路。
2.3.2 混合型輸入電路
因為此類型的PLC 公共端既可以流出電流，也可以流出電流（既PLC公共端既可以接外接電源的正極，也可以接負(fù)極），同時具有源輸入電路和漏輸入電路的特點，所以我們可以姑且把這種輸入電路稱為混合型輸入電路。其電路形式如圖7所示。
圖7 混合型電路
作為源輸入時，公共端接電源的負(fù)極；作為漏輸入時，公共端接
電源的正極。這樣，可以根據(jù)現(xiàn)場的需要來接線，給接線工作帶來極大的靈活。
三菱A系列PLC的AX50-S1/60-S1/70/71/81-S1及Q系列的QX70/71/72。
這里需要說明的是，三菱和SIEMENS關(guān)于“源輸入”和“漏輸入”電路的劃分正好相反，以上是按三菱的劃分方法來介紹的，這點在使用過程中要注意。
SIEMENS S7-300/400系列PLC的直流輸入模塊大多為漏型輸入（公共端接外部電源的負(fù)極。注：按SIEMENS的劃分方法）。在S7-300系列PLC中，只有SM321（-IBH50-）輸入模塊為源輸入（公共端接正。注：按SIEMENS的劃分方法），S7-400系列PLC中則沒有源輸入模塊。小型PLC S7-200的輸入模塊則全部為混合型輸入形式。在大的項目中不建議使用，因此種輸入形式雖然接線方便，但容易造成電源的混亂。
3 外接開關(guān)量信號和PLC輸入電路的連接
PLC外接的輸入信號，除了像按鈕一些干節(jié)點信號外，現(xiàn)在一些傳感器還提供NPN和PNP集電極開路輸出信號。干節(jié)點和PLC輸入模塊的連接比較簡單，這里主要不再綴述。而對于不同的PLC輸入電路，到底是使用NPN輸入還是PNP輸入有時感到無所適從。下面主要介紹一下這兩種輸入和PLC輸入電路的連接。
3.1 NPN和PNP輸出電路的形式
如圖8和圖9所示，分別是NPN和PNP輸出電路的一種形式。
圖8 NPN集電極開路輸出 圖9 PNP集電極開路輸出
從圖8和圖9可以看出，NPN集電極開路輸出電路的輸出OUT端通過開關(guān)管和0V連接，當(dāng)傳感器動作時，開關(guān)管飽和導(dǎo)通，OUT端和0V相通，輸出0V低電平信號；PNP集電極開路輸出電路的輸出OUT端通過開關(guān)管和+V連接，當(dāng)傳感器動作時，開關(guān)管飽和導(dǎo)通，OUT端和+V相通，輸出+V高電平信號。
3.2 NPN和PNP輸出電路和PLC輸入模塊的連接
3.2.1 NPN集電極開路輸出
由以上分析可知，NPN集電極開路輸出為0V，當(dāng)輸出OUT端和PLC輸入相連時，電流從PLC的輸入端流出，從PLC的公共端流入，此即為PLC的漏型電路的形式，即：NPN集電極開路輸出只能接漏型或混合式輸入電路形式的PLC，連接圖如圖10所示：
10 NPN集電極開路輸出和PLC的連接
3.2.2 PNP集電極開路輸出
PNP集電極開路輸出為+V高電平，當(dāng)輸出OUT端和PLC輸入相連時，電流從PLC的輸入端流入，從PLC的公共端流出，此即為PLC的源型電路的形式，即：PNP集電極開路輸出只能接源型或混合型輸入電路形式的PLC，連接圖如圖11所示：
圖11 PNP集電極開路輸出和PLC的連接
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NOS! CONTROL TECHNIQUES DX SERVO MOTOR DXE-4120W DXE4120W 4.25HP 3.17KW 3000RPM
Emerson Control Techniques Mentor II M75R-14M, 40 HP Drive, M75R14M, 63-75AMP
CONTROL TECHNIQUES MHM-490-CONS-0000 USPP MHM490CONS0000
CONTROL TECHNIQUES EP204-P00-EN00 USPP EP204P00EN00
Control Techniques Servo motor With 100:1 Harmonic Drive Reducer
Error-Control Techniques for Digital Communication, Arnold M. Michelson, Allen H
CONTROL TECHNIQUES Ei-205 EPSILON INDEXING DRIVE
CONTROL TECHNIQUES 3533-0502 NSPP 35330502
CONTROL TECHNIQUES RU-653 USPP RU653
CONTROL TECHNIQUES 810238-09 NSFP 81023809
CONTROL TECHNIQUES 7004-0170 USPP 70040170
CONTROL TECHNIQUES PCM-3 USPP PCM3
CONTROL TECHNIQUES CFCS-015 USPP CFCS015
CONTROL TECHNIQUES SA150-R USPP SA150R
Industrial Control Handbook Volume 2 Techniques
CONTROL TECHNIQUES MC-224-00-000 USPP MC22400000
CONTROL TECHNIQUES 02-766250-01 USPP 0276625001
Control Techniques Indexing Module FM-2
Control Techniques for Complex Networks
MINT Control Techniques Quantum II 9500-8411 200/400HP
CONTROL TECHNIQUES 0472-0003-07 USPP 0472000307
CONTROL TECHNIQUES 7012-0280 USPP 70120280
CONTROL TECHNIQUES 810236-10 USPP 81023610
CONTROL TECHNIQUES 810238-03 USPP 81023803
CONTROL TECHNIQUES XI0C-005AXIMA NSFP XI0C005AXIMA
CONTROL TECHNIQUES 4400-0039 NSPP 44000039
CONTROL TECHNIQUES 962502-00 NSFP 96250200
CONTROL TECHNIQUES M75/9500-8303 MENTOR/QUANTUM BASE ***XLNT***
CONTROL TECHNIQUES UNI-1403 USPP UNI1403
CONTROL TECHNIQUES 3130-0377 UD95 DRIVE INTERFACE 31300377
CONTROL TECHNIQUES 1590-4120 USPP 15904120
CONTROL TECHNIQUES FM-3 NSFP FM3
CONTROL TECHNIQUES XTMDS-005 NSFP XTMDS005
CONTROL TECHNIQUES UNIMOTOR BRUSHLESS AC SERVOMOTOR 95EZA600CAMAA *NNB*
NEW PBBDK020 CONTROL TECHNIQUES POWER CABLE FOR SERVO MOTOR WITH BRAKE
CONTROL TECHNIQUES 2200-9120 USPP 22009120
CONTROL TECHNIQUES 810017-06 USPP 81001706
CONTROL TECHNIQUES RC-030 USPP RC030
CONTROL TECHNIQUES 810480-15 USPP 81048015
CONTROL TECHNIQUES OITPC232010 NSFP OITPC232010
CONTROL TECHNIQUES CFCS-020 USPP CFCS020
CONTROL TECHNIQUES SSC-03 NSFP SSC03
CONTROL TECHNIQUES 2400-9002 USPP 24009002
CONTROL TECHNIQUES 200RB4T3 USPP 200RB4T3
CONTROL TECHNIQUES PTOOLS-FM NSFP PTOOLSFM
CONTROL TECHNIQUES TIA-025 NSFP TIA025
CONTROL TECHNIQUES UBDV3 USPP UBDV3
CONTROL TECHNIQUES 0471-0053-02 NSPP 0471005302
Control Techniques Commander CDL 05K 5 HP ICD001
Emerson Control Techniques Mentor II M75R-14M, 40 HP Drive, M75R14M, 63-75AMP
CONTROL TECHNIQUES UNI-1401-R USPP UNI1401R
NEW Emerson Control Techniques Digitax ST DST1405P 1405
CONTROL TECHNIQUES 60 HP FREQUENCY INVERTER V4500ICD
CONTROL TECHNIQUES MD200ISS.3 USPP MD200ISS3
CONTROL TECHNIQUES MGE-208-CONS-0000 USPP MGE208CONS0000
CONTROL TECHNIQUES CABLE COMMAND 4FT 45 DEG CONNECTOR AX4-CEN-004 *NIB*
CONTROL TECHNIQUES 75DSB300HAAAA USPP 75DSB300HAAAA
CONTROL TECHNIQUES 810480-25 USPP 81048025
CONTROL TECHNIQUES SP1406-LED-PICO AC DRIVE NEW
Control Techniques Motor GEPM50 24v
SNES Poster: TECMO SUPER BASEBALL CONTROLLER TECHNIQUES
CONTROL TECHNIQUES 75DSA300HAAAA USPP 75DSA300HAAAA
CONTROL TECHNIQUES EI-203-00-000 EPSILON 203 NEW IN BOX WITH CD & MANUAL
CONTROL TECHNIQUES 3085-240-1 USPP 30852401
OFFER & WIN CONTROL TECHNIQUES DINVERTER 768R INVERTER
CONTROL TECHNIQUES DXA-202 USPP DXA202
EMERSON CONTROL TECHNIQUES VB150 ICD FLUX VECTOR DRIVE
NEW CONTROL TECHNIQUES EPSILON Ei INDEXING DRIVE EI-202
CONTROL TECHNIQUES PCM-11 USPP PCM11
NEW Control Techniques Unimotor 095U2C300VACDA100190
CONTROL TECHNIQUES M45/9500-8302 MENTOR/QUANTUM BASE ***XLNT***
CONTROL TECHNIQUES 9500-8302 QUANTUM III MID SECTION ***XLNT***
EMERSON Control Techniques SP2402 Unidrive 3-Phase AC Drive
CONTROL TECHNIQUES PSBAZA NSPP PSBAZA
CONTROL TECHNIQUES APC-003 NSPP APC003
Advance Techniques Frizz Control
Returns: Accepted
More Options
CONTROL TECHNIQUES 6-17369-007 USPP 617369007
CONTROL TECHNIQUES AX-CEN-004 NSPP AXCEN004
The Big Book of Relaxation: Simple Techniques to Control the Excess Stress in Yo
CONTROL TECHNIQUES 9547-0002 NSPP 95470002
CONTROL TECHNIQUES 95DSA300HAAAA USPP 95DSA300HAAAA
CONTROL TECHNIQUES RU-653 NSPP RU653
CONTROL TECHNIQUES SSC-004 NSPP SSC004
AVON Advance Techniques Frizz Control Lotus Shield
EMERSON CONTROL TECHNIQUES DRIVE 15HP 2950-8400 LASER
CONTROL TECHNIQUES MGE-4120-CBNS-0000 USPP MGE4120CBNS0000
CONTROL TECHNIQUES 2400-9002 NSPP 24009002
The Big Book of Relaxation: Simple Techniques to Control the Excess Stress in Yo
Emerson / Control Techniques EM-CNSX-CMDX003 Cable
CONTROL TECHNIQUES 901F-2562 NSFP 901F2562
CONTROL TECHNIQUES 9547-0002 NSPP 95470002
CONTROL TECHNIQUES 95DSA300HAAAA USPP 95DSA300HAAAA
CONTROL TECHNIQUES RU-653 NSPP RU653
CONTROL TECHNIQUES SSC-004 NSPP SSC004
AVON Advance Techniques Frizz Control Lotus Shield
EMERSON CONTROL TECHNIQUES DRIVE 15HP 2950-8400 LASER
CONTROL TECHNIQUES MGE-4120-CBNS-0000 USPP MGE4120CBNS0000
CONTROL TECHNIQUES 2400-9002 NSPP 24009002
CONTROL TECHNIQUES UD-BV-1 USPP UDBV1
CONTROL TECHNIQUES DD-150 USPP DD150
CONTROL TECHNIQUES SA150NP USPP SA150NP
3 AVON ADVANCED TECHNIQUES FRIZZ CONTROL LOTUS SHIELD
CONTROL TECHNIQUES V4500-ICD USPP V4500ICD
CONTROL TECHNIQUES PCM-22 USPP PCM22
CONTROL TECHNIQUES UNI-1401 USPP UNI1401
Control Techniques DXM-340W Servo Motor
CONTROL TECHNIQUES PCM-2S USPP PCM2S
Defensive Tactics: Modern Arrest and Control Techniques for Today's Police...
Emerson Control Techniques 810204-10 TIX-10
CONTROL TECHNIQUES 300301-11 USPP 30030111
CONTROL TECHNIQUES 6180-8230 USPP 61808230
CONTROL TECHNIQUES DXA6300 USPP DXA6300
CONTROL TECHNIQUES SPMC1601 USPP SPMC1601
Emerson Commander SK Control Techniques SK2403
CONTROL TECHNIQUES AX-CEN-002 USPP AXCEN002
EMERSON/CONTROL TECHNIQUES SP1404 UNIDRIVE (2 AVAILABLE)
CONTROL TECHNIQUES 1074-025 NSPP 1074025
CONTROL TECHNIQUES 300487-05 NSPP 30048705
AVON ADVANCED TECHNIQUES FRIZZ CONTROL LOTUS SHIELD
CONTROL TECHNIQUES DINVERTER 2.2KW DIN1220220B NIB
Nonlinear Analysis and Synthesis Techniques for Aircraft Control (2007,...
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CONTROL TECHNIQUES DXM-6120 USPP DXM6120
CONTROL TECHNIQUES CTP322-015/NTE-212-R NSPP CTP322015NTE212R
CONTROL TECHNIQUES VBE150 ICD FLUX VECTOR DRIVE
2x Control Techniques Brushless AC servomotor 115UMD300CBCAA 3000rpm w/cable
CONTROL TECHNIQUES CMDS-025 USPP CMDS025
CONTROL TECHNIQUES 22004005 USPP 22004005
CONTROL TECHNIQUES 22004005 NSFP 22004005
CONTROL TECHNIQUES PCM-1 USPP PCM1
CONTROL TECHNIQUES SE51 NSPP SE51
CONTROL TECHNIQUES DXE-450 USPP DXE450
CONTROL TECHNIQUES ES-2300RG USPP ES2300RG
Control techniques EN-204-00-000 P/N 960500-10 Rev: A1
CONTROL TECHNIQUES SERVO MOTOR MHM-8500-CBNS-0000 *DAMAGED PLUG*
Essentials of Control Techniques and Theory by John Billingsley (2009,...
CONTROL TECHNIQUES 6180-9007 NSFP 61809007
CONTROL TECHNIQUES TDL-15 NSPP TDL15
