- 型号:3300/40-12-01-00-00-00
- 数量:3
- 制造商: 厦门兴锐达自动化设备有限公司
- 有效期:2019/10/10 0:00:00
BENTLY NEVADA 3300/40-12-01-00-00-00
BENTLY NEVADA 3300/40-12-01-00-00-00
BENTLY NEVADA 3300/40-12-01-00-00-00
控制系统中干扰及其来源
现场电磁干扰是PLC控制系统中最常见也是最易影响系统可靠性的因素之一,所谓治标先治本,找出问题所在,才能提出解决问题的办法。因此必须知道现场干扰的源头。(1)干扰源及一般分类
影响PLC控制系统的干扰源,大都产生在电流或电压剧烈变化的部位,其原因是电流改变产生磁场,对设备产生电磁辐射;磁场改变产生电流,电磁高速产生电磁波。通常电磁干扰按干扰模式不同,分为共模干扰和差模干扰。共模干扰是信号对地的电位差,主要由电网串入、地电位差及空间电磁辐射在信号线上感应的共态(同方向)电压叠加所形成。共模电压通过不对称电路可转换成差模电压,直接影响测控信号,造成元器件损坏(这就是一些系统I/O模件损坏率较高的主要原因),这种共模干扰可为直流,亦可为交流。差模干扰是指作用于信号两极间的干扰电压,主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压,这种干扰叠加在信号上,直接影响测量与控制精度。
BENTLY NEVADA3500/15 127610-01S
BENTLY NEVADA3536-190501
BENTLY NEVADA3600/16-02-01-00-00-00-00
BENTLY NEVADA72208-01 BENTLY
BENTLY NEVADA7200RVXYII
BENTLY NEVADA72400-01-04 BENTLY
BENTLY NEVADA72308-01 P601432
BENTLY NEVADA9200-01-01-02-00
BENTLY NEVADA18745-03 BENTLY
BENTLY NEVADA18745-04 BENTLY
BENTLY NEVADA18745-XX 156295-04
BENTLY NEVADABently Nevada 20929-04
BENTLY NEVADABENTLY NEVADA 20929-07
BENTLY NEVADA21501-00-20-10-02
BENTLY NEVADA21504-000-020-10-02
BENTLY NEVADABENTLY NEVADA 24583-04
BENTLY NEVADABENTLY NEVADA 24654-03
BENTLY NEVADABENTLY NEVADA 45095-02
BENTLY NEVADA72200-02-02-01-01-01-11
BENTLY NEVADA72301-03-04-01 BOARD
BENTLY NEVADABENTLY NEVADA 76683-90
BENTLY NEVADABently Nevada 78432-02
BENTLY NEVADABENTLY NEVADA 78462-01U
BENTLY NEVADABently Nevada 78596-010
BENTLY NEVADABENTLY NEVADA 81725-02
BENTLY NEVADABENTLY NEVADA 90201-02E
BENTLY NEVADABENTLY NEVADA 103928-01
BENTLY NEVADABently Nevada 105375-01
- 电话:0592-5580706/13295922579
- 传真:0592-5361191
- email:LJY_05228@163.com
手机扫描二维码分享本页
工控网APP下载安装
工控速派APP下载安装
评价: | 一般 | ||