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2数字滤波与软件容错技术在程序调试中的应用

PLC控制系统，ProgrammableLogicController，可编程逻辑控制器，专为工业生产设计的一种数字运算操作的电子装置，它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算，顺序控制，定时，计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。是工业控制的核心部分。

PLC控制系统的特点

（1）从开关量控制发展到顺序控制、运算处理，是从下往上的；

（2）逻辑控制、定时控制、计数控制、步进（顺序）控制、连续PID控制、数据控制――PLC具有数据处理能力、通信和联网等多功能；

（3）可用一台PC机为主站，多台同型PLC为从站；

（4）也可一台PLC为主站，多台同型PLC为从站，构成PLC网络。这比用PC机作主站方便之处是：有用户编程时，不必知道通信协议，只要按说明书格式写就行；

（5）PLC网络既可作为独立DCS/TDCS，也可作为DCS/TDCS的子系统；

（6）主要用于工业过程中的顺序控制，新型PLC也兼有闭环控制功能。

PLC的设计选型的8个步骤

系统设计的水平将直接影响控制系统的性能、设备的可靠性。这其中PLC的选型至关重要，如何根据不同的控制要求选择合适的PLC，设计出运行平稳、动作可靠、安全实用、调试方便、易于维护的控制系统呢？在PLC系统设计时，首先应确定系统方案，下一步工作就是PLC的设计选型。选择PLC，主要是确定PLC的生产厂家和PLC的具体型号。对于系统方案要求有分布式系统、远程I/O系统，还需要考虑网络化通讯的要求。那么具体应该如何选择PLC呢？笔者认为应该有以下几方面的内容。
如皮带的打滑、跑偏及拉绳开关等故障信号均与皮带运行信号串联使用，即只有皮带启动后才能发挥作用。若单纯使用故障信号则可能无法启动皮带。这种方法在现场调试时具有很大的灵活性;
Jena Tec 7813-254 Ball Screw, 5mm Pitch, 165mm Travel, 15mm Screw
 
Magpowr PSC224V Magnetic Clutch 24VDC 300mA 2in-lbs 1/4" Shaft
 
Lot of 2 Martin 50BS16 Sprocket 1 1/4" Bore 1/4" Keyway 3 1/2" Diameter 16 Teeth
 
Martin 50BS32 Sprocket 1" Bore 1/4" Keyway 6 3/4" Overall Diameter 32 Teeth
 
Formsprag FSR-5/.625 Clutch Part (right hand) 0.625"
 
Formsprag FSR-5/.625 Clutch Part (left hand) 0.625"
 
Danaher Motion 7827531 Ballnut, 1/2" Inner
 
Coupler 7/32" to 5/8"
 
6' Length HKK40 Roller Chain 1/2" Pitch 5/16" Roller Width 940lbs Maximum Load
 
Browning NSS616 Spur Gear Carbon Steel 16T 1" Bore 14.5° 3" OD 2 3/8" Height
 
Lot of 11 Ruland Motor Couplers 6mm to 7/16" ID, 35.3mm Length
 
Lot of 8 Pulley 24 Teeth, 8mm Inner Diameter, 1-1/2" Width
 
Linear Stage Bellows 12" Overall Width x 44" Maximum Expanded Length Black
 
Linear Stage Bellows 30" Overall Width x 36" Maximum Expanded Length Black
 
Linear Stage Bellows 30" Overall Width x 44" Maximum Expanded Length Black
 
Gates 1008 8MX-22S-21 Pulley with 16mm Taper Lock Bushing
 
Gates 1008 8MX-22S-21 Pulley with 3/4" Taper Lock Bushing
 
Martin P68-5M-25-SDS Sprocket w/Browning SDS 1-11/16 Bushing w/Coupler 3/4" ID
 
Jakob Bellow Servo Coupling, Inner 6mm to 14mm, Outer 45mm to 24.5mm/27.5mm
 
New Warner R1002 Ball Nut
 
New Gates B48 Hi-Power II PowerBand Triple V-Belt 16" Outside Diameter 2 5/16" W
 
24" Lead Screw, 1/2" Shaft Diameter, 1/4" Motor Shaft, 10 TPI
 
Lot of 3 10-3/4" Lead Screw, 9.5mm Shaft Diameter,

Zero-Max Ruland 1 CD Coupling 15.5mm Bore, 60mm Height
 
Actron A5210-16P Ultra-Lightweig?ht Aluminum Slide, 16" Closed, 32" Open
 
General Devices CC3001-00-0220 Drawer Slide 22" Closed, 32-3/4" Extended
 
TB Woods SS4D5SM Short-Stop Motor Brake, 460V, 5HP, 3PH
 
Martin 80Q18H MST Sprocket, 2-11/16 Inner 6-1/4" Outer w/Martin Collet Q1 1-7/8"

	
TB Woods Braketron B3415 Dynamic Electronic Motor Brake 12" x 12" x 6", 460V
 
Martin 25L075SP01 Sprocket, 24 Teeth, 3-1/8" x 1-1/2", 3/4" Belt Width, 1" Inner
 
Martin 20L075SP06 Sprocket, 20 Teeth, 2-5/8" x 1-1/2", 1" Inner 3/4" Belt Width
 
General Devices C-300-S-124 Telescoping Slide 25" Black Steel *Missing Parts*
 
TLI8L073 Timing Pulley 1008 Series TaperLock
 
Lot of 2 Goodyear A60 (4L620) Matchmaker V-Belts
 
Jason UniMatch 3V-750 V-Belt 3/8" Width x 75" Length
 
Gates Powergrip 420H075 Timing-Belt 3/4" Width x 42" Width
 
Bando 420H075 Timing-Belt 3/4" Width x 42" Length
 
Lot of 2 Gates Truflex 2440(4L440) V-Belt 1/2" Width x 44" Length
 
Jason 420H075 Timing-Belt 3/4" Width x 42" Length
 
1632V210 CE ORS/SC Timing-Belt 1" Width x 22" Overall Length
 
1632V210 ENV Timing-Belt 1" Width x 22.5" Overall Length
 
Jason Uni-Match 1632V210 Timing Belt 1" Width x 21.75" Overall Length
 
Bando Power 1632V210 25-32 Timing Belt 1" Width x 21.5" Overall Length
 
Gates 1632V210 Multi-Speed Belt 1" x 21.9"
 
Martin Sprocket 35BS60-1 Sprocket Roller 1" Inner, 7-1/4" Outer
 
Zero Max 6-26 CD Coupling Clamped (2X)
 
Lot of 2 New Gates A27 Hi-Power II V-Belt
 
Taylor Devices 67DP-12902-010 Shock Absorber Liquid Spring
 
Dodge P38-8M-50-SH 110745 HTD Sprocket 1-7/8" Inner, 4-1/4" Outer w/Taper Bore
 
Dodge P38-8M-50-SH 110745 HTD Sprocket 1-7/8" Inner, 4-1/4" Outer
 
New in Box MARTIN 40B9 Sprocket 1/2" Inner Diameter
 
Gam KM-12 Bellow Servo Coupling 8mm to 16mm

Four Sided Rubber Bellow 18" Expanded Bellow Length 15" Width x 11-1/2" Tall
 
Enertrols Snald 150 Miniature Shock Absorber 12mm x 4.75mm
 
Electroid BFSB-7-4 Brake 12V, Energize to Unlock
 
Roller Chain 10' 5/8" Pitch, 0.400" Diameter
 
Lot of 2 3/4" ID Motor Couplings 1 3/4" OD 2 1/8" Length
 
New in Box General Devices C-300-S-124 Telescoping Slide 25" Black Steel 85lbs
 
Martin TB24L100 Timing Belt Sprocket 1-3/4"Bore
 
Dodge TL26L100 Timing Belt Sprocket
 
Martin 22L075 Timing Belt Sprocket 1-3/8"Bore
 
Browning B368M20SH Timing Belt Sprocket
 
TB Woods P44-8M-20-SDS Sprocket 7/8"Belt 1.25"Bore
 
TB Woods P44-8M-20-SDS Sprocket 7/8"Belt 5/8"Bore
 
KEB 09.03.100-0241 Clutch with 24V Motor
 
Zero-Max Helland Torq-Tender 3/4"ID
 
New in Box Zero-Max 6-18 CD Coupling 10mm Bore 60mm Height
 
Zero-Max Torq Tender 3/4

Lot of 6 Goodyear 5L430 Notched V-Belts
 
New Tsubaki RS50RIV RollerChain
 
Tsubaki 40BS24H1 Sprocket
 
TB Woods F63235 Motor Coupling
 
Stainless Steel Shaft 2 3/4" Dia. 27" Length
 
Mayr 2/490.615.0 Clutch 1-3/4" Bore
 
New Zero-Max C031P Control Flex Coupling
 
Spur Gear Sprocket 8" Diameter, 1.5" Bore, 32 Teeth

Warner Electric EP-170 Brake / Clutch 10000RPM 24VDC
 
New Browning 28LH075 Gearbelt Pulley
 
Lot of 5 New in Box Morse W45486 H-3/4 Drive Sheave 3/4"
 
Formsprag Clutch AC P520-0010
 
Magpowr Controller CA-MH-34-375-CM
 
Magpowr Perma-Tork Magnetic Clutch HC-2-25
 
New Parker 406XR Kit 002-3683-02

在国内一些输煤控制程序中，皮带的启、停信号，犁煤器的抬犁、落犁等输出信号普遍采用定时脉冲信号，这样容易造成信号保持与设备响应之间的不协调，即设备已经响应但信号仍然保持，或设备尚未响应但信号已经消失。本文采用设备到位的反馈信号来切断动作回路，有效地解决了某些现场设备动作不可靠的问题。通过设备对输出信号的响应切断其控制回路，使控制软件与现场设备更为紧密地结合起来。

出于在现场调试时系统硬件配置已经确定，对其增加和修改都比较困难，而从软件方面考虑无须增加任何硬件，可充分发挥计算机软件优势，经济实用，可根据不同

出于在现场调试时系统硬件配置已经确定，对其增加和修改都比较困难，而从软件方面考虑无须增加任何硬件，可充分发挥计算机软件优势，经济实用，可根据不同的具体情况采用不同的容错技术，使用方便、灵活，可作为硬件容错的补充，进一步提高系统抗干扰能力。现场实际应用表明，数字滤波和软件容错技术在程序调试中必不可少，且行之有效。

3结论

上述PLC系统调试方法虽然以火电厂输煤程控系统的调试经验为依据，但同样适用于其它控制场合及不同规模的程控系统，因此具有广泛的推广应用价值。若能严格按照以上调试步骤，并合理运用各种调试方法，将有助于解决调试过程中遇到的各类问题，提高调试效率，收到事半功倍的效果。
Mitutoyo 148-111 Micrometer Head, 1/2" Range, 0.001" Graduation, +/-0.002mm
 
New Numerik Jena RIK4-2C 39/3600 L4-RZ Encoder, One-Field 13x8-SV3, 3600-Lines
 
New Numerik Jena RIK4-2C 39/3600 M2-TZ Encoder, One-Field 13x8-SV3, 3600-Lines

	
Federal 90836-001 Digital Inspection Cable
 
Renishaw RGB25Y00R08 Interface Unit
 
Chatillon AG300 Dial Tension Gauge 300 X 5 Gram
 
Heidenhain LS 406 Linear Scale, 570mm Travel, 1μm Resolution w/Cable
 
Heidenhain LS 406 Linear Scale, 570mm Travel, 1μm Resolution
 
Heidenhain AE LS 406 Linear Scale, 820mm Travel, 1μm Resolution w/Cable
 
Heidenhain LS406 Linear Scale, 820mm Travel, 1μm Resolution w/Cable
 
Newport HR-6 6mm High-Resolution Lockable Micrometer
 
New in Box RSF Elektronik MS 65-55G Linear Encoder 50um 5VDC
 
Parker Daedal 25mm Micrometer
 
RSF Elektronik MSA6709 ML 520mm 25μm Resolution 5VDC Signal w/ Read Head
 
Aerotech Motion Controls MX50-C-16M Signal Multiplier D-Sub 25-Pin
 
HIAC Royco Model 3000 Syringe Sampler 115V (FOR PARTS)
 
HIAC Royco Model 3000 Syringe Sampler 115V, 10 to 100 ml/min
 
Pair of New Glastonbury Gage No-Go Gages 1.6305" X
 
Glastonbury Gage No-Go Gage 1.1993" X
 
Pair of Glastonbury Gage No-Go Gages 32.495mm X
 
Pair of Glastonbury Gage No-Go Gages 32.550mm X
 
Pair of Glastonbury Gage No-Go Gages 1.2450" X
 
Wyko Satis Static Attitude Test Inspection System 115V (missing front module)
 
Hewlett Packard 5526A Laser Measurement System, See Details
 
Lot of 7 Swanson Master Gauges XX Series 1.905mm to 0.10699" with Case
 
Tohnichi ATG9Z Torque Gauge 1-9 in.oz, +/- 2% Accuracy, 0.2 in.oz Graduation
 
Tohnichi ATG18Z Torque Gauge 2-18 oz.in, +/- 2% Accuracy, 0.5 in.oz Graduation
 
Tohnichi BTG60Z Torque Gauge 6-60in.oz, +/- 2% Accuracy, 1 in.oz Graduation
 
Mahr 21T3M Surface Gauge 1 7/8" Stage *Cracked Tool Clamp*
 
Polytec OFV-3001 Laser Vibrometer Controller (missing key)
 
DigiTec 5800 Thermometer (temp probe not included)
 
Dillon Model X Force Gauge, 50lb Cap, 0.5lb DIV
 
Tektronix TM506A 6-Slot Module Mainframe
 
Voltcraft DPS-2010PFC Switching Power Supply 240VAC-In, 0-12VDC Out -FOR PARTS
 
Voltcraft DPS-2010PFC Switching Power Supply 240VAC-In, 0-12VDC Out (read desc)
 
Voltcraft DPS-2010PFC Switching Power Supply 220-240VAC-In, 0-20VDC Out
 
SLM AMINCO BOWMAN SQ-340 Luminescence Spectrometer 120VAC Series 2
 
KOH-I-NOOR 8202-12" Triangle 7" x 12" x 14"
 
Lot of 2 KOH-I-NOOR Rapidoguides 3032, 3032A 9/32" & 1/4" Letter Height
 
Lot of 2 KOH-I-NOOR Rapidoguides 3033, 3034 5/16" & 3/8" Letter Height
 
New Precise Technology Probe 922753
 
Keyence LC-2220 LC-2100 Laser Displacement Meter
 
Durant 57600-993 Productivity Monitor / Control 57601-403
 
Bruel Kjaer 2706 Power Amplifier for Accelerometers 100-127/220-240?VAC 2/1A
 
PerkinElmer 1420-040 Victor3V Multilabel Counter 120/240VAC 250VA
 
Hipotronics HM6B DS16-172 Megohmmeter
 
Chatillon DFGRS-50 Force Gauge 50lb x .02lb 25kg x .01kg 250N x .1N, Parts Only
 
Seekonk L-Handle Torque Wrench, 3/8" Drive
 
Lot of 5 Rice Lake Weighing Systems 1g Calibration Standard, Class 1, 7.95g/cm
 
QuadTech 630020 Rev-E2 Shielded High Voltage Lead Set

Newport BD17.04 Differential Micrometer, 4.3mm Coarse, 0.3mm Fine, 10lb Capacity
 
Set of Vintage McGrath St. Paul Calipers 600mm & 900mm
 
Nanometrics Nanoline IV Measurement System (FOR PARTS, AS-IS)
 
Scherr Tumico 50-0135-05 Bore Gage .7"-1.5" 68125
 
New Keyence GT2-H12KL High Precision Force Sensor Head, 0.1μm Resolution, 12mm R
 
Waters WAT024854 LC Module 1 plus Automated Solvent Delivery System *For Parts*
 
EXPO 010-00262R OmniCure Cure Ring Detector System 320-500nm Wavelength ±5%
 
Quantrol BFG50N Basic Force Gauge 11-lbf, 0.002-lbf Readability, +/-0.25%
 
ILT 1400-A Radiometer Photometer 10pA to 350μA Input 0-1V Output
 
USG Test Gauge 0-600 PSI 4" Dia. Gauge, 6" Dia. Housing, 1/4" NPT Inlet
 
New Omega LD500-2.5 Gaging Transducer 2.5mm Stroke, 10-24VDC
 
Ametek P-40A-1K Linear Motion Transducer 36" Travel 25.00mV/V/in
 
ASET McTc AT01E08011 Modulated Current Controller with Periodic Reverse
 
Heidenhain LS406 ML570mm Linear Scale with AE LS 40 Encoder 570mm Travel 1μm Res
 
Wyko Optical Profiler with COHU 4110-1001/0000 Camera 5 1/2" Travel
 
Heidenhain EXE 650B X25/8 Interpolation Box w/Heidenhain LIF 10R, See Details
 
Honeywell 942-M0A-2D-1G1-?220S Position Transducer w/Digital and Analog Output
 
Tektronix 2630 Fourier Analyzer 2 Channel 120VAC 2x Serial Ports D-Sub 9-Pin
 
Tektronix 2630 Fourier Analyzer 4 Channel 120VAC 2x Serial Ports D-Sub 9-Pin
 
Heidenhain EXE-612 Interpolation Box, Heidenhain LS-406 Linear Encoder 820mm 1μm
 
Heidenhain EXE-612 Interpolation Box, Heidenhain LS-406 Linear Encoder 570mm 1μm
 
New Heidenhain MT-1287 375162-01 Linear Encoder, 4 μm Resolution
 
Fischer Beta 870C Fischerscope Control for Non-Destructive Coating Measurement
 
Fischer Z6NGB2 Betascope Non-Destructive Universal Measuring Table *Damaged*
 
Fischer Z6NGB2 Betascope Non-Destructive Universal Measuring Table
 
Fischer Z6NG Betascope Non-Destructive Universal Measuring Table Plating Coating
 
New in Package National Instruments 183882A-02 BNC Cable 2m Length
 
National Instruments 183882A-02 BNC Cable 2m Length
 
High Purity Mixing System with 2 Pressure Transducers, 2 Pneumatic Valves
 
Siemens Thorton W212-401 Sensor 10.0 Const. 10ft Length
 
Renishaw RGH25U50J00B Readhead Encoder 16' Cable w/Renishaw Scale 4-5/8"
 
Renishaw RGB25Z00L00 Interface Unit w/Manual
 
Renishaw RGH22Z30D00 Linear Encoder, 7ft *For Parts Only, Sold As Is*
 
Renishaw RGH22S30D15 Linear Scale (Encoder), 0.1μm Resolution, 8ft Cable
 
Renishaw RGH22S30D15 Linear Scale (Encoder), 0.1μm Resolution, 9ft Cable
 
Yokogawa FP20-S13 Dellomatic Holder
 
Heidenhain QC1000M-HH Quick-Chek w/LIF-101R Encoder, LIF-10R Encoder Reader
 
New Lucas 100-HR Linear Transducer
 
Renishaw RGB25Y00R12 Readhead Encoder, 0.1um Resolution w/Cable
 
Veeder-Root 7972 Digital Tachometer w/Veeder-Root 614619-001 Bench Mount Case
 
Renishaw RGB25Z00L00 Interface Unit
 
RSF Elektronik MSA001-7 Sealed Linear Encoder Spec.10F, MSA001.73 50mm
 
RSF Elektronik MSA 001.73 Sealed Linear Encoder, 50mm Travel *Visible Cord Dmg*
 
RSF Elektronik MSA 001.73 Sealed Linear Encoder, 50mm Travel 5V
 
Renishaw RGH25U50J00B Readhead Encoder
 
Renishaw RGH25U50J00B Readhead Encoder w/Renishaw Scale 4-5/8"
 
Keyence LC-2400 Laser Displacement Meter Instruction Manual, Bound
 
Keyence LC-2400A Laser Displacement System w/ Dual Laser Interfaces, Digital I/O