其一是把多个要输入的信号，先通过外部元件的逻辑组合，然后再接入到PLC的一个输入点上；其二是不需要增加任何元件，通过运用PLC内部的逻辑组合，把连接到输入端的开关变成双稳态开关，来实现我们节省输入点的目的。
下面以工业控制中常见到的电动机的启动停止控制为例，具体来探讨这两种方案的实现方法。为了叙述的方便，我先做这样的假定：PLC系统采用西门子公司的S7-200系列；电动机启动按钮为SB1,定义号为I0.0；停止按钮为SB2，定义号为I0.1；控制电动机的接触器定义为KM1;控制接触器KM1的PLC输出点定义为Q0.0。
方案1：启动、停止按钮SB1和SB2不是单独接到PLC的输入端，而是先把SB1与SB2进行串联再连接到输入模块，这样就节省了一个输入点。控制流程是这样的：按下启动按钮SB2，I0.0输入高电平，Q0.0有输出信号，带动接触器KM1吸合，启动电动机旋转，同时接触器的辅助触点吸合，维持I0.0的高电平，从而电动机的旋转得以保持；按下停止按钮SB1，I0.0变为低电平，Q0.0便由高电平变为低电平，从而使KM1失电，电动机停止旋转。
另外一种解决输入点不足的方法是通过软件来实现，这种方案的接线非常简单，直接把一个按钮连接到PLC输入端，我把它定义为I0.0,但按下这个按钮，可以启动电动机旋转；若再按下这个按钮，又可以使电动机停止，即这个按钮是双稳态的
我们来看它是如何实现的：按下按钮，I0.0为高电平，由于初始状态下M0.0是逻辑0，只有网络1中有电流流过，M0.1置位，从而在按钮释放后，Q0.0点输出，Q0.0激励KM1，使电动机旋转；同时M0.0变为逻辑1，为M0.1复位做好准备。如果此时再按下按钮，又只能使网络2中有电流流过，M0.1复位。它的复位使Q0.0失电，电动机停止，同时使M0.0复位，又为M0.1置位做好准备。再按下按钮，又会重复上述循环。之所以在网络3支路中串入I0.0，是为了取一个瞬时信号，保证按下按钮并等释放了以后，才使状态发生改变。如果您持续按着按钮不释放，PLC仍维持原来的状态不改变。
以上两套方案都是切实可行的，具体采用哪一种，那还要根据您实际的使用条件来决定，切莫盲目套用。
一、电除尘器低压控制系统的组成及控制要求
电除尘器的低压控制工艺主要包括振打控制，绝缘子温箱电加热控制灰斗电加热控制、卸灰控制、料位控制、进出口温度显示、高压隔离开关到位显示以及远程通讯等。
1.1振打控制系统
电极振打清灰是电除尘器的主要工作过程，其清灰效果不仅与施加在阴阳极上的振打加速度有关，而且振打周期对其影响也很大。传统的振打方式为切向振打，其控制可分为连续振打和定时振打。在振打力度和均匀性都满足要求时，振打制度是否合理，对电除尘器除尘效率影响。振打过频，收集在阳极极板上的粉尘不能成块落入灰斗，二次飞扬严重，尤其末级电场的二次飞扬，将大大降低除尘效率。反之，振打周期过长，阳极上的粉尘堆积过厚，会使阴阳极之间电压降低，二次电流降低，电晕功率减小，除尘效率下降;阳极板严重积灰甚至形成反电晕，使已经被收集在在阳极板上的粉尘再次进入气流。因此，选择合理的振打周期，将有助于地清灰和提高除尘效果。
1.2卸灰控制系统
进入电除尘的粉尘被阴阳极捕获后，由振打系统振落在灰斗中，这些灰料应适时排送出去，灰料堆积太多，相互了增加灰斗的荷重外，严重时还会造成阴阳之间的短路，使电除尘器无法正常运行，相反，灰斗没有储灰，在灰斗出口出现漏风，引起二次扬尘，使除尘效率降低。
1.3极热控制系统
加热控制系统的对象包括大梁电加热器、阴瓷轴电加热器、灰斗电加热器等。常用的控制策略是根据测温装置的温度信号对电加热器进行恒温控制。当温度地狱下限时，启动电加热器加热;温度高于上限时，停止电加热器加热。
二、电除尘器低压控制系统的应用实例
山东某厂使用的低压控制系统除尘室采用三电场除尘方式，电除尘器3个电场有6个振打电机、3个灰斗加热控制器、3根大梁加热控制器、3个卸灰电机，再加上报警用信号输出端、热风电机控制、总启动、故障解除、3个电场料位计检测输入、大梁灰斗等处温度、控制等，总计是20点数字输出、23点数字量输入、8点模拟量输入,6TC温度测量输入。
根据以上计算，电除尘器低压控制系统以CPU-224A为主控部分。
其中CPU224A模块接受电机驱动保护器的故障信号，电加热保护控制器的故障信号，温度采集处理器的温度信号，料位信号以及输卸灰设备的电气信号等，经分析处理后，根据工艺流程把控制振打电机、加热器、报警器等控制信号输给相应的外部设备。数字量输入/输出模块EM223把CPU模块控制卸灰电机的信号输给相应的外部设备。模拟量输入模块EM231把高压硅整流设备的有关信号及温度采集器送进来的进出口烟气温度，大梁、瓷轴、灰斗等处的温度信号送给CPU模块分析处理。
三、电除尘器低压控制系统的软件设计
3.1振打控制设计
根据多年对电除尘器低压控制系统的运行经验，为提高电除尘器的除尘效率，有效降低功耗，对本地振打电机的优化控制作如下要求：
同一电场中阴极和阳极振打不能同时进行;
多电场除尘器中，前后电场阳极(或阴极)振打不能同时进行;
设置有振打槽板的电除尘器，其末电场阳极振打和槽板振打不能同时进行。
3.2加热工作
加热器采用恒温区间控制，即以设定温度的上、下振幅为工作区间来控制加热器的启停。当测量温度低于设定温度低于设定温度的下偏差时，加热器开始工作，当加热到测量温度高于设定温度的上偏差时，加热器停止工作，直到测量温度低于设定温度的下偏差，加热器再次开始加热，循环往复，完成温度控制。
3.3卸灰控制设计
电除尘器的卸灰方式可分为定时自动卸灰，上、下料位自动卸灰及上料位定时自动卸灰。在本系统中采用的是“高料位+时序”的控制方法，即高料位定时卸灰，周期卸灰相结合的综合方式。所谓高料位卸灰指的是当低压控制系统检测到某一上料位信号时先启动相应的卸灰装置;当器工作时间后，再延时一段时间停止相应的输灰联锁系统。为避免出现料位计损坏或者误报而导致电场堵灰，又加入定时周期卸灰功能，以保证系统能够进行自动卸灰。
原标题:PLC在电除尘控制系统中的应用
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FANUC A20B-1000-0200 USPP A20B10000200
A06B-0128-B588 FANUC SERVO MOTORS REMANUFACTURED
A06B-0128-B588#7000 FANUC SERVO MOTORS REMANUFACTURED
FANUC A06B-0313-B706 SERVO MOTOR AC **Repair**
FANUC A06B-6078-H206#H500 Spindle Amplifier Module 6,8kW
GE FANUC IC3600QOXC USPP IC3600QOXC
Fanuc A06B-0212-B605 Servo Motor A06B0212B605 ServoMotor aif 2/5000 0.75kW
FANUC A06B-0128-B575 USPP A06B0128B575
A06B-0143-B088#0008 FANUC SERVO MOTORS REMANUFACTURED
A06B-0143-B088#7008 FANUC SERVO MOTORS REMANUFACTURED
NEW GE Fanuc A06B-0313-B032 Model 0S AC Servo Motor A06B0313B032 ServoMotor OS
Fanuc A06B-6047-H040 Servo Drive A06B6047H040 Velocity Control Unit ServoDrive
FANUC SERVO AMPLIFIER A06B-6114-H104
FANUC 3 AXIS AC SERVO DRIVE A06B-6058-H322
FANUC A06B0377B675 AC SERVO MOTOR **Repair**
FANUC A06B-0505-B002 USPP A06B0505B002
Fanuc Servo Motor A06B-0315-B005/7008
FANUC A06B-6127-H207 SERVO AMPLIFIER AISV-40/40HV **Repair**
FANUC A16B-2200-0200 USPP A16B22000200
FANUC A16B-1210-0200 USPP A16B12100200
FANUC A05B2301C305 / A05B-2301-C305 / A05B 2301 C305
FANUC POWER SUPPLY MODULE A06B-6081-H102
Fanuc A05B-2518-C304#EMH Teach Pendant Repair Only!!!!!!!!!!!!!!!!!!!!!!!!
A06B-0148-B075#7075 a22/3000 AC SERVO MOTOR GE FANUC ID3436
FANUC A06B-6059-H003-H503 SERVO DRIVE SPINDLE AMPLIFIER AC SP-3S **Repair**
FANUC A20B-8001-0700/02B001338 ELECTRONIC PCB CIRCUIT BOARD RIO INTERF, NEW
Fanuc A16B-1000-0140 - $2,077.00 IN STOCK A16B10000140
Fanuc A06B-0315-B202 # 7000 AC Servo Motor
Fanuc Servo Amp A06B-6114-H104
FANUC A20B-2902-0530 USPP A20B29020530
FANUC A13B-0073-C001 USPP A13B0073C001
FANUC A06B-0162-B175#E006 SERVO MOTOR AC AM6/3000 A64 BRAKE **Repair**
Fanuc A06B-0313-B031 Motors-AC Servo [PZ4]
FANUC A16B-1210-0560 USPP A16B12100560
FANUC A06B-0142-B175 SERVO MOTOR AC AC12/2000 **Repair**
FANUC A06B0314B172 SERVO MOTOR **Repair**
NEW GE FANUC 531X122PCNAHG1 POWER CONNECTOR CARD PCB CIRCUIT BOARD D256499
FANUC A860-0200-T020 USPP A8600200T020
FANUC A16B-2200-0780 USPP A16B22000780
FANUC SERVO MOTOR A06B-0314-B574#7008
FANUC A03B-0403-C020 USPP A03B0403C020
A20B-0008-0375/0205C BOARD FANUC ID4132
FANUC A06B-0372-B084 SERVO MOTOR **Repair**
FANUC A06B-0590-B0647000 SERVO MOTOR 16 AMPS 3 POLE 1200RPM **Repair**
FANUC A20B-0007-0330 USPP A20B00070330
FANUC A06B-6078-H311-H500 SERVO AMPLIFIER MODULE SPM-11 **Repair**
FANUC A06B0128B5757076 SERVO MOTOR **Repair**
FANUC A06B-0317-B274/7008 SERVO MOTOR **Repair**
A06B-0522-B251 FANUC SERVO MOTORS REMANUFACTURED
Fanuc A06B-0128-B577-7008 Motors-AC Servo [PZ4]
FANUC A16B-1210-0090 USPP A16B12100090
FANUC A16B-1210-0120 USPP A16B12100120
FANUC SPINDLE SERVO UNIT A06B-6059-H002#H502,A16B-1100-0240/05A,A16B-1100-0200/2
A06B-0373-B175 FANUC SERVO MOTORS REMANUFACTURED
A06B-0143-B075#7076 FANUC SERVO MOTORS REMANUFACTURED
44A736236-001R01 FANUC RELAYS NEW
Fujitsu Fanuc Power Unit A14B-0026-B002 _ A14B0026B002 _ A20B-0003-0630/07A
Fanuc IC670ALG320J analog output curr/volt 4PT GRP
FANUC AO6B-0345-B231 SERVO MOTOR AO6B0345B231
RECONDITIONED FANUC SERVO AMPLIFIER ( A06B-6079-H205)
GE FANUC IC660BBD025U 32PT SINK BLOCK 5/12/24VDC *FACTORY SEALED*
GE FANUC IC660BBA100N ANALOG 4I/20 BLCOK 115VAC 50/60HZ *FACTORY SEALED*
GE FANUC IC660BBD025T 32PT SINK BLOCK 5/12/24VDC *FACTORY SEALED*
GE Fanuc IC697CMM742-LL Ethernet Interface for Series 90-70
Fanuc Spindle Amplifier Module, A06B-6088-H230 #500, Ser A, Used, WARRANTY
GE-Fanuc IC697CMM742 Industrial Control System
GE Fanuc IC752DPH000-BB Operator Interface Touchscreen Datapanel Model H E157515
A06B-0147-B075#7000 FANUC SERVO MOTORS REMANUFACTURED
Fanuc AC Servo Motor aM22/4000i_aM22/4OOOi _ A06B-0265-B400 A06B0265B400
Fanuc Circuit Board A16B-1300-0010/02B _ A16B1300001002B _ A16B-13OO-OO1O/O28B
NEW FANUC SERVO AMPLIFIER A06B-6058-H331 A06B6058H331
FANUC A16B-1010-0331 BOARD A16B10100331 MATSUURA MC-1000VDC5 CNC MILL
FANUC A06B-0652-B005 SERVO MOTOR A06B0652B005 MAZAK V-12 CNC MILL
FANUC A06B-6044-H308 SPINDLE DRIVE A20B-1000-0692 ACROLOC M15L CNC VERTICAL MILL
ACROLOC M15L FANUC ROTARY TABLE INDEXER & BAYER INDUSTRIES PANEL BOARD 116-548.2
FANUC 2 Axis Servo Unit A06B-6058-H223
FANUC A06B-6041-H108 SPINDLE DRIVE A20B-0008-037 NAKAMURA TMC-3 TOME CNC LATHE
FANUC SERVO MOTOR A06B-0511-B001 PULSE CODER A860-0304-T011 ELOX CEF-50 EDM CNC
FANUC A06B-6064-H318#H550 SPINDLE SERVO UNIT W/ UNIT ADAPTER A06B-6059-K032
FANUC A06B-1012-B200-R SPINDLE MOTOR A06B1012B200R WASINO LV-24M VERT LATHE
FUJITSU FANUC A14B-0046-B001 POWER UNIT A14B0045B001 IKEGAI FANUC FX
Fanuc A06B-0353-B831 Model 30F AC Servomotor
GE FANUC MOTOR A06B-0032-B075 2/3000 NEW
GE FANUC A16B-3200-0110/08D A16B-3200-0110 FS16B MAIN-B
GE FANUC A06B-6058-H012 SERVO AMPLIFIER
Fanuc A20B-8200-0393 Circuit Board Used
GE FANUC IC693CPU364-CJ IC693CPU364 CH
GE FANUC HORNER 90-30 HE693RTD666C HE693RTD666 NEW
GE FANUC MOTOR A06B-0032-B075 #7008 2/3000 NEW
GE FANUC A06B-6077-H001 P. FAILURE BACK UP
GE FANUC A16B-2203-0290/01A A16B-2203-0290 ER1T A16B-2203-0290/02A
GE FANUC IC693CPU364-BD IC693CPU364
GE Fanuc A16B-0160-0370 BOARD
GE Fanuc A16B-0160-0380 BOARD
GE Fanuc A16B-0160-0390 BOARD
GE FANUC 531X300CCHABM5 531X300 NEW
NEW LISTING GE FANUC IC670ALG320J IC670ALG320
A06B-0128-B588#7008 Motor Fanuc
FANUC CNC BOARD A16B-0160-0471/23K A16B-0160-0471
FANUC CNC BOARD A16B-0160-0481/05B A16B-0160-0481
GE FANUC IC693CPU340 NSFP IC693CPU340
FANUC A06B-0502-B527 SERVO MOTOR **Repair**
A06B-0153-B088#0075 FANUC SERVO MOTORS REMANUFACTURED
IC697BEM731F, GE FANUC , DIVERSEN , GENIUS BUS CONTROLLER, IC697BEM731F
IC697BEM731J, GE FANUC , DIVERSEN , GENIUS BUS CONTROLLER, IC697BEM731J
IC697BEM731K, GE FANUC , DIVERSEN , BUS CONTROLLER , IC697BEM731K
IC697BEM731N, GE FANUC , DIVERSEN , GENIUS BUS CONTROLLER, IC697BEM731N
IC697BEM731R, GE FANUC , DIVERSEN , GENIUS BUS CONTROLLER, IC697BEM731R
IC697BEM731S, GE FANUC , DIVERSEN , GENIUS BUS CONTROLLER, IC697BEM731S
GE FANUC IC3600PTJA4 USPP IC3600PTJA4
A20B-1004-0390-03A FANUC A20B BOARD ID254
FANUC A06B-0317-B072/7000 SERVO MOTOR 3000RPM 15AMP 145V **Repair**
FANUC A20B-1000-0200 USPP A20B10000200
A06B-0128-B588 FANUC SERVO MOTORS REMANUFACTURED
A06B-0128-B588#7000 FANUC SERVO MOTORS REMANUFACTURED
FANUC A06B-0313-B706 SERVO MOTOR AC **Repair**
FANUC A06B-6078-H206#H500 Spindle Amplifier Module 6,8kW
GE FANUC IC3600QOXC USPP IC3600QOXC
Fanuc A06B-0212-B605 Servo Motor A06B0212B605 ServoMotor aif 2/5000 0.75kW
FANUC A06B-0128-B575 USPP A06B0128B575
A06B-0143-B088#0008 FANUC SERVO MOTORS REMANUFACTURED
A06B-0143-B088#7008 FANUC SERVO MOTORS REMANUFACTURED
NEW GE Fanuc A06B-0313-B032 Model 0S AC Servo Motor A06B0313B032 ServoMotor OS
Fanuc A06B-6047-H040 Servo Drive A06B6047H040 Velocity Control Unit ServoDrive
FANUC SERVO AMPLIFIER A06B-6114-H104
FANUC 3 AXIS AC SERVO DRIVE A06B-6058-H322
FANUC A06B0377B675 AC SERVO MOTOR **Repair**
FANUC A06B-0505-B002 USPP A06B0505B002
Fanuc Servo Motor A06B-0315-B005/7008
FANUC A06B-6127-H207 SERVO AMPLIFIER AISV-40/40HV **Repair**
FANUC A16B-2200-0200 USPP A16B22000200
FANUC A16B-1210-0200 USPP A16B12100200
FANUC A05B2301C305 / A05B-2301-C305 / A05B 2301 C305
FANUC POWER SUPPLY MODULE A06B-6081-H102
Fanuc A05B-2518-C304#EMH Teach Pendant Repair Only!!!!!!!!!!!!!!!!!!!!!!!!
A06B-0148-B075#7075 a22/3000 AC SERVO MOTOR GE FANUC ID3436
FANUC A06B-6059-H003-H503 SERVO DRIVE SPINDLE AMPLIFIER AC SP-3S **Repair**
FANUC A20B-8001-0700/02B001338 ELECTRONIC PCB CIRCUIT BOARD RIO INTERF, NEW
Fanuc A16B-1000-0140 - $2,077.00 IN STOCK A16B10000140
Fanuc A06B-0315-B202 # 7000 AC Servo Motor
Fanuc Servo Amp A06B-6114-H104
FANUC A20B-2902-0530 USPP A20B29020530
FANUC A13B-0073-C001 USPP A13B0073C001
FANUC A06B-0162-B175#E006 SERVO MOTOR AC AM6/3000 A64 BRAKE **Repair**
Fanuc A06B-0313-B031 Motors-AC Servo [PZ4]
FANUC A16B-1210-0560 USPP A16B12100560
FANUC A06B-0142-B175 SERVO MOTOR AC AC12/2000 **Repair**
FANUC A06B0314B172 SERVO MOTOR **Repair**
NEW GE FANUC 531X122PCNAHG1 POWER CONNECTOR CARD PCB CIRCUIT BOARD D256499
FANUC A860-0200-T020 USPP A8600200T020
FANUC A16B-2200-0780 USPP A16B22000780
FANUC SERVO MOTOR A06B-0314-B574#7008
FANUC A03B-0403-C020 USPP A03B0403C020
A20B-0008-0375/0205C BOARD FANUC ID4132
FANUC A06B-0372-B084 SERVO MOTOR **Repair**
FANUC A06B-0590-B0647000 SERVO MOTOR 16 AMPS 3 POLE 1200RPM **Repair**
FANUC A20B-0007-0330 USPP A20B00070330
FANUC A06B-6078-H311-H500 SERVO AMPLIFIER MODULE SPM-11 **Repair**
FANUC A06B0128B5757076 SERVO MOTOR **Repair**
FANUC A06B-0317-B274/7008 SERVO MOTOR **Repair**
A06B-0522-B251 FANUC SERVO MOTORS REMANUFACTURED
Fanuc A06B-0128-B577-7008 Motors-AC Servo [PZ4]
FANUC A16B-1210-0090 USPP A16B12100090
FANUC A16B-1210-0120 USPP A16B12100120
FANUC SPINDLE SERVO UNIT A06B-6059-H002#H502,A16B-1100-0240/05A,A16B-1100-0200/2
豫公安备 41010502000017号