TRICONEX 3381 英维思SIS模块 冗余系统 通信控制模块

TRICONEX 3381 英维思SIS模块 冗余系统 通信控制模块

影响PLC控制系统的干扰源与一般影响工业控制设备的干扰源一样，大都产生在电流或电压剧烈变化的部位，这些电荷剧烈移动的部位就是干扰源。干扰类型通常按干扰产生的原因、噪声干扰模式和噪声波形性质来划分。

按噪声产生的原因不同，分为放电噪声、浪涌噪声、高频振荡噪声等；按噪声的波形、性质不同，可分为持续噪声、偶发噪声等；按噪声干扰模式不同，分为共模干扰和差模干扰。空间辐射电磁场（EMI）主要是由电力网络、电气设备的暂态过程、雷电、无线电广播、电视、雷达、高频感应加热设备等产生的，通常称为辐射干扰，其分布极为复杂。

若PLC系统置于其射频场内，就会受到辐射干扰，其影响主要通过两条路径：一是直接对PLC内部的辐射，由电路感应产生干扰；二是对PLC通信网络的辐射，由通信线路感应引入干扰。

The interference source that affects the PLC control system is the same as the interference source that generally affects the industrial control equipment, which is mostly generated in the part where the current or voltage changes dramatically, and the part where the charge moves violently is the interference source. Interference types are usually divided according to the cause of interference, noise interference mode and noise waveform properties.

According to the different causes of noise, it can be divided into discharge noise, surge noise, high-frequency oscillation noise, etc. According to the different waveform and nature of noise, it can be divided into continuous noise, accidental noise and so on. According to the different noise interference modes, it can be divided into common mode interference and differential mode interference. Space radiation electromagnetic field (EMI) is mainly generated by power networks, transient processes of electrical equipment, lightning, radio broadcasting, television, radar, high-frequency induction heating equipment, etc., usually called radiation interference, and its distribution is extremely complex.

If the PLC system is placed in its radio frequency field, it will be affected by radiation interference, which is mainly through two paths: one is the direct radiation inside the PLC, which is interfered by the circuit induction; The second is the radiation to the PLC communication network, which is induced by the communication line.