HIMA F3236 Power module
We know that reliability is very important for industrial production. Every producer wants to keep his production line in good condition, but the fact tells us that it is impossible. We can try to avoid equipment problems and reduce the possibility of problems. At this time, the PLC control system is much better than the original relay control. In fact, we can see this from the appearance of both sides. After all, there are more circuits in the relay control system, and the installation and removal are more complex. Many lines are densely interwoven, which is not only easy to damage the lines due to mutual friction, but also easy to interfere with the signal electromagnetic wave in the other line. The PLC equipment is relatively simple and rule-based, and is not easy to be damaged by self-interference.
(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.
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