| 价格 | 面议 |
|---|---|
| 品牌 | 进口 |
| 区域 | 全国 |
| 来源 | 厦门兴润星贸易有限公司 |
详情描述：
Edwards QMB1200 西门子的计数器C1、C2等大能接受什么频率的脉冲呢？什么时候必须采用高速计数呢？这个是看PLC的什么指标算出来的？ 答：PLC的计数器在计数脉冲的上升沿时计数。计数器实际上是一种“软件”计数器，与PLC的扫描工作方式有关。PLC在每个扫描周期开始的时候读取数字量输入的值。如果前一扫描周期读取的是0、本次扫描周期读取的是1，操作系统就知道出现了计数脉冲的上升沿，将计数器的当前值加1或减1。下图假设PLC的扫描周期和计数脉冲的周期都是恒定的。如果计数脉冲的周期小于2倍扫描周期，就会丢失计数脉冲的上升沿。实际上PLC的扫描周期不是恒定的，由于程序的跳转或中断等原因，都会使扫描周期增大，导致丢失计数脉冲的上升沿。计数脉冲的高电平和低电平脉冲的宽度小于扫描周期，也会丢失脉冲的上升沿。实际工作中可以用STEP7读取扫描周期大致的平均值，计数器的大计数脉冲的频率应比它的两倍的倒数小一些。小得越多越保险。如果不能满足要求，只有改用高速计数器。 7 ADEPT 310 and 840 Robots Robotics Branson Laser Stand Laser Welder Chiller System Chilli Kulicke & Soffa K&S SP2100 TAB Bonder K&S K & S Wafer J-Mar JMAR Precision Systems CMM 52610-01-01-N JMAR PRECISION SYSTEMS 52610-01-01 CMM 6 Quantronix 0201-03776 Laser System Lot 5 Foton 8030A Video Auto Die Bonders Semiconductor LDJ Magnetic Analyzer 9600 VSM LTC10 ORBO TECH 360-04-50001 Imaging System Instron 1122 Electromechanical test System ORBO TECH 360-04-50001 Imaging System Zumbach USYS 2000 1000 Laser Micrometer Intergraph FDSP11304 IMA Microscope system Haumiller Spin Welder Spinwelder 200 CPM 3 GS Kinney KT-150 Vacuum Pump Rotary Piston INSTRON 1122 Electromechanical Test System 4 TECHNIFOR UCS200 METAL STAMPING MARKING SYSTEM 230V ONAN AC GENERATOR CUMMINS ENGINE 50/60 kw TREK Washer Film Cleaner 4 Station Inline Cleaner TREK Washer Film Cleaner 4 Station Inline Cleaner XYZ Adept Die Bond Epoxy Liquid Dispenser Automation T Sixtau Wire Harness Assembly Inspection Station Carous Calsem Group 30T Delta Moulding Press 6 Adept Smartamp 30410-10000 5 LAMBDA PHYSIK HV LASER POWER SUPPLY 28084030 400V Wabash PC650-50 65 Ton Hydraulic Press 30x24’’ Adept 90402-30013 Robotic Module Leatherwood Plastics Passivation Strip Station LPF233. BACHI Multi Coil Winding Machine HP 43856A X Ray system Bridgeport Series 1 2 HP Vertical Milling Machine Best UPS UT3120 PS40 120kVA Nordson XYZ automated fluid dispensing Paint CNC XYZ Adept Die Bond Epoxy Liquid Dispenser Automation T 40 Wire Basket Container 44x54x50 Inspect Technologies 8006-R02 Microscope Inspection Ma JEOL JEM-100cx Electron Microscope TEM Scanning Corning 09-06 1 SME Fiber Optical Cable 41,000 ft Optic Hermes Regent GU 3275S OD Grinder Grinding Despatch HP516 Style V-2 Recirculating Electrical Oven HP 43855B X Ray system Electrovert UltraClean II H2O PCB Wash Machine Walker Scientific Magnetizer HV-10 Electromagnet Komax Alpha 411 Automatic Crimping Machine Wire Comparator 89/CMS Optical Comparator 2 Pillarhouse Quadron Solder Dip Tin Machines HP 8657A Signal Generator 14 units Total 2 Elgar AC Power Source 1751 400SR 7 LAMBDA PHYSIK LASER TECHNIK POWER CONTROLS 2 Diesel Generators PU-710/G & MEP-006A Adept Cobra 600 Robot Robotic Arm Adept Technology Cobra 600 Robot Robotic Arm MV-10 Zumbach USYS 1000 Laser Head Micrometer Zumbach KW-26XY IR Laser Head Micrometer LORAIN WAA502B INVERTER DC-AC 5 KVA Totoku TCD-WP-S Magnet wire stripper 8 units Universal 4836PDH-DC200 Media Blast Machine Brown & Sharpe Traverse Surface Grinder No1 S148826 DUNHAM-BUSH EM-52-UHF REFRIGERATION COMPRESSOR 6 UNITS Simpson S3-14 r Step Down Transformer Converter Adept Cobra 600 Robot Robotic Arm Adept Technology Cobra 600 Robot Robotic Arm Adept Cobra 600 Robot Robotic Arm Adept Cobra 600 Robot Robotic Arm PMR SYSTEMS ULTRASONIC CLEANER. Adept Cobra 600 Robot Robotic Arm PA-4 2 CONAIR 18041202 MOLDING DEHUMIDIFYING DRYER 480V 3PH Ya SIH HTE-807 Cooper Wire Preheater Kalamazoo FA350A Automatic Cold Saw Tantec D-71299 Spot Corona Generator Surface Treater HP 43855A X Ray System 2 Cutler-Hammer SPB100 Switchboards Conceptronic HVA 102 High Velocity Forced Convection O CROWNE 30SP36 TL Order PICKER FORKLIFT 3000 LBS Adept Cobra 600 Robot Robotic Arm 3 Lindgren RF Enclosures Radio Frequency Branson Ultrasplice 502 830M Ultrasonic Welder
| 联系人 | 何雄欣 |
|---|
