2)手动复位型热继电器，其常闭触点可以在PLC的输出电路中与控制电机的交流接触器的线圈串联。
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编程者经常违背的规则中有一条是“简单化原则”。，如果程序简单，则是容易写出，容易检查的，而且是很少会出错的。不是所有情况都要求7位精度或好的控制。本页给出的绿棚说明了一个在学校中学到的基本原理是如何用来有效而廉价地解决问题的。本例中，双金属条用来检测周围温度。这可以是一个控制所有窗户的大型商业绿棚，或是有一个窗户的花园绿棚。本例是控制四扇窗户，每扇窗户有一检测温度的双金属条，对每个双金属条，存在两个输入，一个对应金属条冷的情况，这可以认为是常闭的，另一个对应金属条热的情况，即它变形时，可认为是一个常开接点，。这些输入与窗户位置有直接联系，如果过热，双金属条弯曲，触点接通，于是窗户打开。当绿棚部分变冷时，双金属条伸直，窗户关上。是
这些故障，都可以用合适的故障诊断方法进行分析和用软件进行实时监测，对故障进行预报和处理。
这些故障，都可以用合适的故障诊断方法进行分析和用软件进行实时监测，对故障进行预报和处理。
PLC系统的正常供电电源均由电网供电。由于电网覆盖范围广，它将受到所有空间电磁干扰而在线路上感应电压和电路。尤其是电网内部的变化，入开关操作浪涌、大型电力设备起停、交直流传动装置引起的谐波、电网短路暂态冲击等，都通过输电线路传到电源原边。PLC电源通常采用隔离电源，但其机构及制造工艺因素使其隔离性并不理想。实际上，由于分布参数特别是分布电容的存在，**隔离是不可能的。
系统管理程序主要控制PLC的运行，使PLC按正确的次序工作；用户指令解释程序将PLC的用户指令转换为机器语言指令，传输到CPU内执行；功能程序与系统程序调用则负责调用不同的功能子程序及其管理程序。
注意：系统程序直接关系到PC的性能，不能由用户直接存取，所以，通常PC产品资料中所指的存储器形式或存储方式及容量，是指用户程序存储器而言。
MURR ELEKTRonIK 85657 ConVERTER SWITCH
BAILEY IPMON01 INFI 90 120/240V-AC 1/10A AMP PCB CIRCUIT BOARD D464975
ConWAY CLUTCH 858-4C PNEUMATIC 1-1/4IN BORE CLUTCH D407997
NEW AMAT 3870-06006 Ham-Let UCV Series Diaphragm Valve
Lot of 5 BECO MW663W2DFS-HV, 3 way valves, 3/8 FPT
NEW Novellus A01-201-01 Housing shower head, 8 inch
SQUARE D 9999-DT12 ELECTRIC INTERLOCK ASSEMBLY D520
414-0611-001 415-0611
PARKER L25 STEPPER DRIVE
IBM 4694 SOCKET3 MOTHERBOARD NW-RPL-TCP/IP
GE General Electric WB27X11081 Microwave Smart Board AP4484349
GOULD SHAWMUT CRS400 NEW! QUANTITY! 400A 600VAC TYPE D TIME DELAY TEMPORISE FUSE
JAMESBURY 4" QUADRA-POWR DIAPHRAGM ACTUATOR TORQUE VALVE QPX2C/M
DD480 KIMA K11 Echtzeitsysteme 120-100-001
DODGE 3A9.0 B9.4 SK 455631 3GROOVE 1-1/4 IN V-BELT DUAL DUTY SHEAVE D389247
PLC的扫描周期包括上电后初始处理、共同处理、上位链接服务、外设服务、运算处理、I/O刷新。
TOTAL ConTROL QPJ2D100S2P QUICKPANEL JR SER A 24V-DC INTERFACE PANEL D522850
MITSUBISHI FX0-14MR-ES QUANTITY!!!
REGAL 1/2" SIZE CLAMP FITTING 8221 *LOT OF 7 NEW*
DG782 AS Accu-Sort Accu-Ranger Rangefinder Datalogic ohne power supply
3.1799.370 PIN SWEEP ARM SHAFT 8-3/16X1-1/2IN REPLACEMENT PART D393441
REXROTH 4WRZ32W3-520-31/S0204R PROPORTIonAL DIRECTIONAL
ConTROL ConCEPTS IC+102 LINE FILTER
LOT 15 ALCOA 5175.547 TERMINAL ConNECTOR D523304
GENERAL ELECTRIC GE 19C305239G6 GROUP RECEIVE D513048
PCB BOARD 740122A-02, 500122-02, 147598-12, 294892
Parker Veriflo SMQRMHF60S11 SS Bottom Port Mini Regulator
AMAT 0190-77166 SCR IN ABT Diamond disk Abrasive Technology inc.
REGO 2511AC 1-1/2 IN NPT 400 WOG BRonZE THREADED GLOBE VALVE D514358
414-0611-001 415-0611
INTEC PROTEC pH
ELTEC IPCA-2 BOARD, ELTEC IPCA-A200/1 REV G BOARD
Perceptron 916-3007 Rev 1 C0400-X0000-Y0062-Z0129 Digital Contour Sensor
WOODHEAD SST-DN3-PCU-1 DEVICENET INTERFACE CARD NEW!! QUANTITY!!
AEG MODICON 24VDC COMBINATION I/O MODULE DAP 220 / AS-BDAP-220
LE28 camille bauer Gossen Metrawatt Eurax 89-2B1-511
AMOT 1 1/2 CMB11001 THERMOSTATIC ConTROL VALVE 1-1/2 IN NPT D397367
主要考虑来自系统外部的几种如果抑制措施。主要内容包括：对PLC系统及外引线进行屏蔽以防空间辐射电磁干扰；对外引线进行隔离、滤波，特别是原理动力电缆，分层布置，以防通过外引线引入传导电磁干扰；正确设计接地点和接地装置，完善接地系统。另外还必须利用软件手段，进一步提高系统的安全可靠性。
WAUKESHA 20-269 SEAT GASKET BUTTERFLY VALVE REPLACEMENT PART D270454
THERMO 900010 PH SODIUM FILL SOLUTION TEST EQUIPMEN
ROSS ConTROL W7476A6331 SINGLE SOLENOID PILOT ConTROLLED VALVE, 2-10 BAR, NIB
M455 SCA APC 3000-60 PB 0153.0600 Profibus DP-Controller
MOYNO AE0051 CAVITY PUMP STEEL BEARING HOUSING frame ASSEMBLY D482233
SCI CORP 80-219600-90 REV A PCB CIRCUIT BOARD D467623
ALLEN BRADLEY 509-EOD SER A 100HP 135A AMP SIZE 4 MOTOR
GE 731X21G409 TYPE SST-3 PULSE TOTALIZER 120V-AC COUNTE
LOT 3 LEXMARK ASSORTED 85 PRINT CARTRIDGE 11507 INK
NEW AMAT 0021-04244 Magnet holder block, RP-3
MKS Instruments HPS 99H1467 Pneumatic Isolation Angle Valve, KF50
NEW SUNX DPH-101, UDPH101, DPH-100 series Pressure sensor , sensor head
SEW EURODRIVE R133R72D36DT100L4 DF36DT100L4 5HP GEA
414-0611-001 415-0611
SCHRADER BELLOWS 9920-013X1P 23-1/2IN PNEUMATIC FILTER ELEMENT D296833
Global Weighing Technologies GWT 011242 15 Kg C3 Load Cell K-SAGPW6KR / 15-C00
Hitachi Hizac EB-20HR Programmable Controller
TB WOODS WF2 REMOTE KEYPAD IKPW-01 Rev.J IKPG-01 Rev.G QUANTITY!!!
NORTH COM FIT BOX OF 15 SIZE MEDIUM REUSEABLE EARPLUGS 281603 NEW
TU366 Heller Uni-pro ACPU90-VE B 23.050052-00094 H 22.000138-03189
ADVANCE 78E4041-001 480V-AC 400W BALLAST LIGHTING D403565
分类：简单型——只能联机编程；只能用指令清单编程
VICTOR 0740-0013 WELDER SEAT & STEM ASSEMBLY D49164
TETRA PAK 963416 5-1/16IN ID 6-1/4IN OD 7/16IN WIDE SEAL D361078
AEG 24VDC MODICON PROCESSOR MODULE PC-A984-145
PV881 Siemens Sipart 6DR2803-8A Einschub
FOXJET S02444-004 PRINTHEAD ASSEMBLY D311403
OPTIBELT B70 S=C PLUS VB CLASSICAL SECTION 73 IN 21/32 IN V-BELT D493628
ALLEN-BRADLEY 140M-C2E-B25 CIRCUIT BREAKER WITH 100-C09*10 RELAY
EMERSON 02-766363-00 RELAY BD 12-766363-00 8511 PCB CIR
KOLLMORGEN MT308B1-R1C1 GOLDLINE XT 230V-AC 5.16A 4.79NM 3PH SERVO MOTOR D513267
NEW AMAT 0040-45552 Panel, Toxic skin, lower fixed
FLOWLINE LU10-1303 ULTRASonIC LEVEL SWITCH 401464
NEW AMAT 0010-38166 ASSY, CHAMBER LID, PHASE III, TRENCH NG KIT
PRINCE 1.5RK59T BALL VALVE REPLACEMENT PART REPAIR
414-0611-001 415-0611
SMC CG5EA63TNSR-50 50MM STROKE 63MM BORE 145PSI PNE
Warranty KOLLMORGEN / VICKERS BRUSHLESS SERVO DRIVE BDS4 BDS4A-203H202B2
Metra Instruments 1010XE Operator Interface 1010XE-COS 611-0012-000
ALLEN-BRADLEY 802X-AM7 SER.D NEMA/EEMAC 7 & 9 MAKE BREAK LIMIT SWITCH
FLOWSERVE ULTRASWITCH W/ COMPACT ACTUATOR C25 SR-2C IMP & 1IN 150 CF8M VALVE
DG372 Siemens Teleperm M 6DS1402-8AA 6DS1 402-8AA E13 OVP
FALK 0788550 1010G EXP BLT 1-1/4 IN HUB D503491
编程器——PLC开发应用、监测运行、检查维护不可缺少的工具
THERMO ENVIRonMENTAL 8775 ANALYZER TEST EQUIPMENT D5137
UNITED SCIENCES 1003-0900-01 PCB CIRCUIT BOARD D508
SQUARE D NEMA SIZE 1 600V 50/60HZ STARTER, CLASS 8536 TYPE S *NEW*
TU952 Phoenix Contact RAD-ISM-2400-SET-UD-ANT 2867283 OVP Versiegelt
GENERAL ELECTRIC GE 125D3607G1 LD RT/ST LM LG I/D P
WESTINGHOUSE 845A343G PCB CIRCUIT BOARD D464686
GROVE GEAR BM224 P1-3 FLEXALINE 3.03HP 10:1 56C WORM GEAR REDUCER D509477
ENGLAND L090/095N JAW COUPLING SPIDER INSERTS D506076
JOHNSON ConTROLS VFD66HCB TRANE 0-460V-AC 2.5A AMP MOTOR DRIVE D502328
AMAT 0240-93339 upgrade shoe pickup 100mm
Nanometrics 7200-022808-R, XLS75, Xenon Source, 7300-3765-D, 395636
NEW AMAT 0010-13806 AC power box assy orienter OCR
KOLLMORGEN INDUSTRIAL DRIVES PSR PSR4/5A-212-9181
414-0611-001 415-0611
FANUC AC SERVO MOTOR A06B-0123-B675#7000 ( A06B0123B6757000 )
Allen-Bradley 2090-UXNBMP-18515 Motor Brake Cable - NEW FACTORY SEALED
Nissan 44100-L8000 Wheel Cylinder
TRI CLOVER C2047005034 REPAIR KIT REPLACEMENT PART
FOXBORO 3-15PSI PNEUMATIC ConTROLLER 43AP-FA42C/PC-00
ON65 Lenze Drive PLC EPL 10200 XX
LOT 7 APPLETON ASSORTED ALUMINUM DOUBLE GANG SQUARE
功能模块图编程语言的特点：功能模块图程序设计语言的特点是：以功能模块为单位，分析理解控制方案简单容易；功能模块是用图形的形式表达功能，直观性强，对于具有数字逻辑电路基础的设计人员很容易掌握的编程；对规模大、控制逻辑关系复杂的控制系统，由于功能模块图能够清楚表达功能关系，使编程调试时间大大减少。
PANEL METER D521146
ELECTRO-MATIC TRIPLE SET POINT CURRENT SENSOR MDS-350 QUANTITY!!!
SIMCO F167S POWER UNIT 115/120VAC 0.25A 4003443
LE31 camille bauer Gossen Metrawatt Eurax V604-231
AMMERAAL BELTECH 400625 SS CLIPPER LACE 81 IN 14 IN ConVEYOR BELT D502667
SJ ConTROLS EBU-10-SS-00-30 ELECTRonIC BATCHING UNIT CO
HIOKI 3111-02 MOHM HI TESTER D521523
DEZURIK 9499924R001 BRS 175CWP IRON FLANGED 8 IN BUTTERFLY VALVE D519564
EMC PA2 BI-DIRECTIonAL TURBINE METER PREAMPLIFIER REPLACEMENT PART D359663
MKS Control Valve 253A-4-100-1-S
Vacuum Controller System, AMAT 0090-90592, Control Target 0100-90187, 400853
MKS 253B-11102 WJ 1000 or WJ 999 Aviza CFC exhaust throttle valve
PMV P-1500 PNEUMATIC DOUBLE ACTING POSITIonER D2935
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STAINLESS GUIDE RAIL 4-HOLE 17-1/2IN LENGTH 7/8IN WIDE 1/2IN THICK D358801
Ashcroft Dresser Industries K13M0242C1100 Pressure Transducer K13M0242C1100#
GE Fanuc Programmable Controller IC697MDL940 Output Module - Relay 16 Point
ALLEN-BRADLEY 284D-FVD6P0Z-25-RR-3 ARMORSTART 3HP 480VAC WASHDOWN QUANTITY!!
OMRON SYSMAC C1000H PROGRAMMABLE ConTROLLER C1000H-CPU01-EV1
PP246 Tucker B405 E110705
AIRTEC MF07 510-HN 1/4 IN NPT SOLENOID VALVE 24V-DC D401290
开关量输出模块的输出电流(驱动能力)必须大于PLC外接输出设备的额定电流。用户应根据实际输出设备的电流大小来选择输出模块的输出电流。如果实际输出设备的电流较大，输出模块无法直接驱动，可增加中间放大环节。
SQUARE D M5DSFS030 480V DISConNECT SWITCH 30A FUSIBLE F
TAKEX GMR2RN TAKENAKA FB1120 PHOTOELECTRIC SENSOR D
ABB DSQC345E SERVO DRIVE UNIT 3HAB8101-14/08C
M599 Panel Eingabeger?t Linde BT 330 M
3M 78-8070-1273-3 LOWER SPRING BLACK D272389
US MOTORS 3 LS63/T CBN1502-S-A-31.5-T24-63-25 1/4HP 31.
HITRAN GK0058 PCB CIRCUIT BOARD D497035
ERIEZ EZ5 9504305 metaL DETECTOR ConTROLLER 115V-AC 5A
ALLEN BRADLEY 709-EOB103 SIZE 4 480V-AC 100HP MOTOR STA
NEW AMAT 0020-02126 Bellows seat, Bottom, REV.5.2 HEAD, ECP, IM1988
Asyst 095586-CNT-PR01B PCB Board, 415519
AMAT 0200-00933 Tetra Ceramic Cover, Screw, Cathode Liner 300MM DPS I 401875
CMC MSD S3002M000007
414-0611-001 415-0611
STEEL 1-9/16IN OD THREADED SHAFT REPLACEMENT PART D
Edwards Barocel Pressure Sensor 600AB Trans 1000TR NW16 W60041811
BAUMULLER BUS-21-15/30-30-001 SERVO DRIVE
SULLAIR 405510 50-105-0840 PNEUMATIC FILTER ELEMENT D392937
ELECTRO MATIC PRODUCTS AMBER LED SAFETY LIGHT EMBZ1CPSLED-R
DG934 Merlin Gerin Schneider Leistungsschalter NS1000H 1000A
FMC 088-07-0221 VALVE SEAL KIT REPLACEMENT PART D34
■如果不是使用故障，则可能是偶然性故障或系统运行时间较长所引发的故障。对于这类故障可按PLC的故障分布，依次检查、判断故障。首先检查与实际过程相连的传感器、检测开关、执行机构和负载是否有故障：然后检查PLC的I/O模板是否有故障：**后检查PLC的CPU是否有故障。
WEXXAR 63-3557 ACTUATOR ASSEMBLY REPLACEMENT PART D370618
SICK OPTIC ELECTRonIC WT27-2F430 PHOTOELECTRIC SWITCH 1000mm RANGE QUANTITY!
SIEMENS 220V 30VA OBJEKSTAND DEST 3800 6AW3 100-7AX41 MA86/026 193/003
MU165 Bender UG-Isometer USGG 151 RY
GOODYEAR W-52S-MPB EAGLE PD DOUBLE HELICAL TIMING 1/2 IN SPROCKET D436604
SIEMENS S30810 Q2473 X000 04 SLMR3 PCB CIRCUIT BOARD MODULE D523732