ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101

Description

Mark: ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101

Product No.: ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101

Zahlung: T/T, Western Union, credit card

Produktherkunft:USA

Warehouse: 1

Garante: 12 months

Zertifikat: Chief Operating Officer

With the development of science and technology, PLC is more and more widely used in industrial control. The reliability of PLC control system directly affects the safe production and economic operation of industrial enterprises, and the anti-interference ability of the system is the key to the reliable operation of the whole system. Various types of PLCs used in the automation system are either installed in the control room, or installed on the production site and various motor equipment. Most of them are in the harsh electromagnetic environment formed by strong current circuits and strong current equipment. In order to improve the reliability of PLC control system, designers can effectively ensure the reliable operation of the system only by knowing all kinds of interference in advance.

The interference sources that affect the PLC control system are the same as the interference sources that generally affect the industrial control equipment. Most of the interference sources are generated in the parts where the current or voltage changes sharply. These parts where the charge moves violently are the noise sources, that is, the interference sources.

The types of interference are usually divided according to the cause of interference, the interference mode of noise and the waveform nature of noise. Among them, according to the different causes of noise, it can be divided into discharge noise, surge noise, high-frequency oscillation noise, etc; According to the waveform and nature of noise, it can be divided into continuous noise and occasional noise; According to different sound interference modes, it can be divided into common mode interference and differential mode interference. Common mode interference and differential mode interference are a common classification method. Common mode interference is the potential difference between the signal and the ground, which is mainly formed by the common state (in the same direction) voltage transmission induced by the grid connection, ground potential difference and space electromagnetic radiation on the signal line. The common mode voltage is sometimes large, especially in the electrical power supply room with poor isolation performance, the common mode voltage of the transmitter output signal is generally high, and some can be as high as 130 V. Common mode voltage can be converted into differential mode voltage through asymmetric circuit, which directly affects the measurement and control signal and causes component damage (this is the reason for high damage rate of I/O modules in some systems). This common mode interference can be DC or AC. Differential mode interference refers to the interference voltage between the two poles of the signal, which is mainly formed by the coupling induction of space electromagnetic field between the signals and the conversion of common mode interference by the unbalanced circuit. This interference is directly superimposed on the signal and directly affects the measurement and control accuracy.