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1 引言
PLC 控制系统的设计中，虽然接线工作占的比重较小，大部分工作还是PLC 的编程设计工作，但它是编程设计的基础，只要接线正确后，才能顺利地进行编程设计工作。而保证接线工作的正确性，就必须对PLC 内部的输入输出电路有一个比较清楚的了解。
我们知道，PLC 数字输入模块为了防止外界线路产生的干扰（如尖峰电压，干扰噪声等）引起PLC 的非正常工作甚至是元器件的损坏，一般在PLC 的输入侧都采用光耦，来切断PLC 内部线路和外部线路电气上的联系，保证PLC 的正常工作。并且在输入线路中都设有RC 滤波电路，以防止由于输入点抖动或外部干扰脉冲引起的错误信号。
2 输入电路的形式
2.1 分类
PLC 的输入电路，按外接电源的类型分，可以分为直流输入电路和交流输入电路；按PLC 输入模块公共端（COM 端）电流的流向分，可分为源输入电路和漏输入电路；按光耦发光二极管公共端的连接方式可分为共阳极和共阴极输入电路。如下图1所示：
图1 PLC输入电路的分类
2.2 按外接电源的类型分类
2.2.1 直流输入电路
图2 为直流输入电路的一种形式（只画出一路输入电路）。当图1 中外部线路的开关闭合时，PLC 内部光耦的发光二极管点亮，光敏三极管饱和导通，该导通信号再传送给处理器，从而CPU 认为该路有信号输入；外界开关断开时，光耦中的发光二极管熄灭，光敏三极管截止，CPU 认为该路没有信号。
图2 直流输入电路
2.2.2 交流输入电路
交流输入电路如图3 所示，可以看出，与直流输入电路的区别主
要就是增加了一个整流的环节。
交流输入的输入电压一般为AC120V 或230V。交流电经过电阻R的限流和电容C的隔离(去除电源中的直流成分)，再经过桥式整流为直流电，其后工作原理和直流输入电路一样，不再缀述。
图3 交流输入电路
从以上可以看出，由于交流输入电路中增加了限流、隔离和整流三个环节，因此，输入信号的延迟时间要比直流输入电路的要长，这是其不足之处。但由于其输入端是高电压，因此输入信号的可靠性要比直流输入电路要高。一般，交流输入方式用于有油雾、粉尘等恶劣环境中，对响应性要求不高的场合，而直流输入方式用于环境较好，电磁干扰不严惩，对响应性要求高的场合。
2.3 按流入公共端电流的流向分类
2.3.1 漏型输入电路
漏型输入电路如图4所示，此时，电流从PLC 公共端（COM端或M端）流进，而从输入端流出，即PLC 公共端接外接DC电源的正极。
图4 漏型输入电路
此图只是画出了一路的情形，如果输入有多路，所有输入的二极管阳极相连，就构成了共阳极电路。如图5所示。
图5 共阳极电路
三菱A系列PLC的AX40/41/42/50/60及Q系列的QX40/41/42等输入模块均属于漏型输入模块。
2.3.2 源型输入电路
图3所示的电路也是源型输入电路的形式，此时，电流的流向正好和漏型的电路相反。源型输入电路的电流是从PLC的输入端流进，而从公共端流出，即公共端接外接电源的负极。
如果所有输入回路的二极管的阴极相连，就构成了共阴极电路，如图6所示：
图6 共阴极电路
三菱A系列PLC的AX80/81/82及Q系列的QX80/81的输入模块均属于此类输入电路。
2.3.2 混合型输入电路
因为此类型的PLC 公共端既可以流出电流，也可以流出电流（既PLC公共端既可以接外接电源的正极，也可以接负极），同时具有源输入电路和漏输入电路的特点，所以我们可以姑且把这种输入电路称为混合型输入电路。其电路形式如图7所示。
图7 混合型电路
作为源输入时，公共端接电源的负极；作为漏输入时，公共端接
电源的正极。这样，可以根据现场的需要来接线，给接线工作带来极大的灵活。
三菱A系列PLC的AX50-S1/60-S1/70/71/81-S1及Q系列的QX70/71/72。
这里需要说明的是，三菱和SIEMENS关于“源输入”和“漏输入”电路的划分正好相反，以上是按三菱的划分方法来介绍的，这点在使用过程中要注意。
SIEMENS S7-300/400系列PLC的直流输入模块大多为漏型输入（公共端接外部电源的负极。注：按SIEMENS的划分方法）。在S7-300系列PLC中，只有SM321（-IBH50-）输入模块为源输入（公共端接正。注：按SIEMENS的划分方法），S7-400系列PLC中则没有源输入模块。小型PLC S7-200的输入模块则全部为混合型输入形式。在大的项目中不建议使用，因此种输入形式虽然接线方便，但容易造成电源的混乱。
3 外接开关量信号和PLC输入电路的连接
PLC外接的输入信号，除了像按钮一些干节点信号外，现在一些传感器还提供NPN和PNP集电极开路输出信号。干节点和PLC输入模块的连接比较简单，这里主要不再缀述。而对于不同的PLC输入电路，到底是使用NPN输入还是PNP输入有时感到无所适从。下面主要介绍一下这两种输入和PLC输入电路的连接。
3.1 NPN和PNP输出电路的形式
如图8和图9所示，分别是NPN和PNP输出电路的一种形式。
图8 NPN集电极开路输出 图9 PNP集电极开路输出
从图8和图9可以看出，NPN集电极开路输出电路的输出OUT端通过开关管和0V连接，当传感器动作时，开关管饱和导通，OUT端和0V相通，输出0V低电平信号；PNP集电极开路输出电路的输出OUT端通过开关管和+V连接，当传感器动作时，开关管饱和导通，OUT端和+V相通，输出+V高电平信号。
3.2 NPN和PNP输出电路和PLC输入模块的连接
3.2.1 NPN集电极开路输出
由以上分析可知，NPN集电极开路输出为0V，当输出OUT端和PLC输入相连时，电流从PLC的输入端流出，从PLC的公共端流入，此即为PLC的漏型电路的形式，即：NPN集电极开路输出只能接漏型或混合式输入电路形式的PLC，连接图如图10所示：
10 NPN集电极开路输出和PLC的连接
3.2.2 PNP集电极开路输出
PNP集电极开路输出为+V高电平，当输出OUT端和PLC输入相连时，电流从PLC的输入端流入，从PLC的公共端流出，此即为PLC的源型电路的形式，即：PNP集电极开路输出只能接源型或混合型输入电路形式的PLC，连接图如图11所示：
图11 PNP集电极开路输出和PLC的连接
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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
