GE IS210AEBIH1BED modular
(2) Main sources and ways of interference in PLC system
A. Strong current interference
The normal power supply of PLC system is supplied by the power grid. Due to the wide coverage of the power grid, it will be subject to all spatial electromagnetic interference and induce voltage on the line. In particular, changes in the power grid, surges in the operation of knife switch, start and stop of large power equipment, harmonics caused by AC and DC drives, and the instantaneous impact of short circuit in the power grid are all transmitted to the power supply through the transmission line.
B. Interference in the cabinet
High-voltage electrical appliances, large inductive loads and disordered wiring in the control cabinet are easy to cause a certain degree of interference to the PLC.
C. Signal line interference
All kinds of signal transmission lines connected to the PLC control system will always be invaded by external interference signals in addition to transmitting various effective information. There are two main ways of such interference: one is the power grid interference connected in series by the transmitter power supply or the power supply of the shared signal instrument, which is often ignored; The second is that the signal line is subject to the inductive interference of space electromagnetic radiation, that is, the external inductive interference of the signal line, which is very serious. The interference introduced by the signal will cause the I/O signal to work abnormally, and the measurement accuracy will be greatly reduced, which will seriously affect the measurement accuracy
“PLC is an electronic device specially designed for digital operation in industrial environment. It uses programmable memory to store instructions of logic operation, sequential operation, timing, counting and arithmetic operation, and can control various types of machinery or production processes through digital or analog input and output. PLC and its related peripheral equipment should be designed according to the principle of easy connection with industrial control system and easy expansion of its functions.” 3 The hydraulic decoking electrical control system is composed of the high pressure pump room electrical control cabinet, the tower top positive pressure explosion-proof operation panel and the tower bottom contact switch box. 4. Control flow chart and working principle of hydraulic decoking electrical control system
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