所谓电力拖动方案是指根据零件加工精度、加工效率要求、生产机械的结构
当所有的指令执行完毕时,集中把输出状态寄存器的状态通过输出部件转换成被控设备所能接受的电压或电流信号,以驱动被控设备,这就是输出刷新阶段。PLC经过这五个阶段的工作过程,称为一个扫描周期。完成一个周期后,又重新执行上述过程,扫描周而复始地进行。扫描周期是PLC的重要指标之一,在不考虑第二个因素(与编程器等通信)时,扫描周期T为:
(读入一点时间×输入点数)+(运算速度×程序步数)+(输出一点时间×输出点数)十故障诊断时间
显然扫描时间主要取决于程序的长短,一般每秒钟可扫描数十次以上,这对于工业设备通常没有什么影响。但对控制时间要求较严格,响应速度要求快的系统,就应该精确的计算响应时间,细心编排程序,合理安排指令的顺序,以尽可能减少扫描周期造成的响应延时等不良影响。
Syron Double Blank Analyzer, # DBA100,
BS&B 3" Type RLS 269101 316/INC A
Allen Bradley Drive, # 1336F-BRF75-AN-EN, Series A,
Gusher Pump, 11019NS-SE-7-A, 3 HP, 3 Phase,
Total Source BLW3F/00 YT Axle Oil Seal
Western Reserve Controls 1771-JMBJ Circuit Board PCB Free Shipping!
Turck FXDP-IOM Profibus-DP Input/Output Station Module
OHMITE Lug Resistor C300KR40 WATT 300 Free Shipping!
OEM Genuine Ricoh IBM 39V2213 Magenta Toner Cartridge
Fanuc Display Control PC Card, A20B / 05B,
ESW Electronic Systems Of Wisconsin rev B PCB Board
Littelfuse NLS 60 Fuse Class K-5, 600 VAC or less
Fanuc CNC Control, Series 21i-TA, A02B-0247-B535, Date:
APW/McLean Electronic Air Conditioner, # MG039H,
Lexmark C500S2MG Magenta Toner Cartridge OEM READ!!
Yaskawa Servopack, CACR-IR10SEBY20, , 60 Day
39A7278 Isolated Discrete Input Card Circuit Board REV E
Siemens AC Servo Motor, 1FT6084-1AF71-3EG1,
Lot of 21 CKD Valves MMGD-10v-AT2-L1 7F-0305 SEALED
Pantec DPI 30 A8D21XX05 Panel Meter
Qty Available Mizar 79K Eprom Expansion Card
Rambaudi Geared Milling Head, #40 Taper, 5.5 kW, RPM, PDB,
Allen Bradley 700-CF400Z* Ser A Contactor Relay 24 VDC Coil Free Shipping
Rexroth L3511 Pneumatic Valve 4 Way, 2 Pos, 24 VDC Free Ship!
Yaskawa Servopack Servo Controller, CACR-SR05BB1BF-H,
KMC Controls CSP-5001 Air Flow VAV Controller
Generic 10X7648 Circuit Control Board PCB Rev. A Free Shipping!
MKS CDN572-5 I/O Digital High Density Controller w/24Channel
Murr Elektronik MBM I/O Extension Module, 55923, w/ 55958 Terminals,
Seagate 9BD Hard Disk Drive Barracuda 3.5" 80GB Free Shipping!
Gardner Denver 927255 Servo Motor, 1B030A, 1K1A, 1ZA Nutrunner Tool Assy,
Siemens S30810-Q1113-XX-21/02 Module
GE General Electric F31X300CCHADG1 PCB Board WARRANTY
OEM Genuine Lanier 884913 Yellow Toner Cartridge LD228c/LD232c
OEM Genuine Lanier Yellow Toner Cartridge 2138 LP138c LP235c
Mitsubishi Operation Board YZ214A-2, KS-YZ14B, 3 - HD52A,
port 6162A Digital Panel Meter Free Shipping!
Siemens 6ES54564UB12 Module
Furnas 50ZAC3 Duplex Contact Block for Push Button Kit 2 NO Free Shipping!
Siemens / NEC PC Board, C-03, VACACP, A,
OEM Genuine Oce 494-3 Magenta Toner Cartridge