描述
当PLC的输入端输入信号发生变化PLC输出端对该输入变化做出反应需要一段时间,这种现象称为PLC输入/输出响应滞后。
由上述分析可知,扫描周期的长短主要取决于程序的长短。扫描周期越长,响应速度越慢。由于每一个扫描周期只进行一次I/O刷新,即每一个扫描周期PLC只对输人、输出状态寄存器更新一次,故使系统存在输人、输出滞后现象,这在一定程度上降低了系统的响应速度。工业现场的干扰常常是脉冲式的、短时的,PLC的输入/输出响应滞后,对一般的工业控制要求,是完全允许的,还可以起到增强系统的抗干扰能力。
但是,对于控制时间要求严格、响应速度要求较快的系统,就要采取措施减小输入/输出滞后的不利影响
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。
Woodward 5464-768 CPU-DCS II
Woodward 5464-827 CPU MODULE
Woodward 5464-828
Woodward 5464-829
Woodward 5464-830 A/I 4-20
Woodward 5464-833 4 ch
Woodward 5464-834
Woodward 5464-836 REMOTE XCVR
Woodward 5464-843 NetCon CPU Card
Woodward 5466-006 4-20mA Input
Woodward 5466-017 2 CH ACTUATOR DRIVER
Woodward 5466-026 DUPLEX CUR IN
Woodward 5466-031 Netcon I/O Controller?????
Woodward 5466-032 FTIO MODULE
Woodward 5466-033 CPU Module
Woodward 5466-041 2C Pos Control
Woodward 5466-042 CPU(GAP Compatible)-DCS
Woodward 5466-061 Module Master CPU
Woodward 5466-063 NetCon CPU Card
Woodward 5466-074 CPU Mod
Woodward 5466-250 netcon B FTIO
Woodward 5466-253 MPU A I/O
Woodward 5466-258 NetCon/MicroNet Discreet I/O Card 24/12
Woodward 5466-268
Woodward 5466-272 Solnd Mon
Woodward 5466-274 FTIO
Woodward 5466-315 NetCon/MicroNet Analog I/O Card
Woodward 5466-316 MPU A I/O
Woodward 5466-332 ANALOG I/O 24/8
Woodward 5466-336 SIO
Woodward 5466-340 Netcon F/O XCVR
Woodward 5466-348 Netcon 5000B SIO
Woodward 5466-351 Netcon CPU 040 with LLC Memory
Woodward 5466-352 CPU Module
Woodward 5466-353 MAIN XCVR
Woodward 5466-355 REMOTE XCVR
Woodward 5466-409 NetCon/MicroNet CPU Card
Woodward 5466-411 Ethernet Module(RJ45)
Woodward 5466-419 NT CPU
Woodward 5466-425 24/8A I/O
Woodward 5466-458
Woodward 5500-018
Woodward 5500-134 Ext.Card
Woodward 5500-159C 505 Relay Board
Woodward 5500-510
Woodward 5500-559 Buffer Board
Woodward 5500-563
Woodward 5501-003 Circuit Board for Peak 150
Woodward 5501-340
Woodward 5501-341
Woodward 5501-367 FTM(Field Termination)
Woodward 5501-376 FTM,ANALOG,HI DENS
Woodward 5501-411
Woodward 5501-428 2 CH ACTUATOR DRIVER
Woodward 5501-432 2 CH ACTUATOR DRIVER
Woodward 5501-465
Woodward 5501-466 MicroNet Power Supply
Woodward 5501-469 CPU LM6000 PC&PA
Woodward 5501-470 CPU_040 W/O LL?Memory??
Woodward 5501-471 NetCon/MicroNet SIO Card
Woodward 5501-510 FT Relay
Woodward 5503-173 MicroNet VME CPU Adapter
Woodward 5503-279 TC/RTD
Woodward 5503-282 FTM,analog
Woodward 5503-335 CPU
Woodward 6945-377 3103 Gas Fuel Valve
Woodward 8200-015 Peak 150(HVAC-No ModBus)
Woodward 8200-019 PEAK 150
Woodward 8200-177 DRIVER,EM DIGITAL/ANALOG
Woodward 8200-203 ProTech 203
Woodward 8200-226 SPC(servo position controller)
Woodward 8200-314 GS/LQ Digital Driver
Woodward 8220-805 Final Driver
Woodward 8226-043 OCP(operator control panel)
Woodward 8230-568 Control Panel
Woodward 8230-805 FINAL DRVR
Woodward 8230-815 HP Final Drive
Woodward 8230-827 LP Final Driver
Woodward 8230-840
Woodward 8230-841
Woodward 8230-896 Final Driver-Water
Woodward 8230-898 FINAL DRVR
Woodward 8234-167O 501 Chassie
Woodward 8234-213 Chassis-NetCon A
Woodward 8234-346A 501 Chassie
Woodward 8236-026
Woodward 8236-027 Operate Control Panel
Woodward 8236-039 OCP(operator control panel)
Woodward 8236-039 OCP(operator control panel)