How to improve the anti-interference ability of industrial control equipment? First of all to correctly use the PLC - Industrial control -

The core issue of industrial control equipment, anti-interference ability, if high anti-interference ability is not enough, so, this device is not much use.

to improve the anti-interference ability of industrial control equipment, the first is to learn the correct use of PLC.

1, the core of PLC power supply and input/output interface power supply should be independent

, the vast majority of users in the design of power system, there is only one power supply, PLC kernel, and interfaces with the power supply. Understand light coupling principle of man you will find that this kind of connection, will the light coupling bypass, that is to say, the light coupling did not have the effect of isolation, the PLC is a 'naked', without any protection ability, very dangerous! The right thing to do is add a power source, only to power a PLC controller kernel. Input/output interface can share a power supply.

2, if the PLC output received inductive load, such as solenoid valve, relay coil load, such as need to reverse an absorbing diode load at both ends. Specific method, can to our website to view the wiring diagram of product

without this reverse diode at the instant of the solenoid or relay disconnect, can produce a reverse electromotive force. The back emf, and output power superposition together, will be considerably more than the output transistor ( Or field effect tube) Voltage limit, causing the triode breakdown. For reverse diode parameters, as long as it is current not less than current relay, pressure is not lower than interface power supply voltage line, like 1 n4004, 1 n4007 has any problem. In addition, the electromagnetic valve on the market, wiring if marked is negative, it means it has absorbing circuit, keep the external diode.

3, the choice of power supply

jamming signal is the high frequency signal. Is a typical interference source inverter, thyristor voltage regulation circuit. Now on the market most of the power supply is switching power supply, small size, efficiency is high, but the biggest drawback is that high frequency interference signals can penetrate. And in the past the old power supply, that there is a large volume of transformer, large volume, low efficiency, but it can be very effective for high frequency interference signal. So, when choosing the kernel power, should choose the old transformer power supply.

if you can't find the old transformer power supply, can be in front of the switch power supply by a 1:1 isolation transformer, or in the kernel power of input common-mode coil, used to cut off the high frequency interference.

4, layout

there are two ways to interference, is a wire transmission, 2 it is space radiation conduction. More than 1 and 3 can solve wire conduction interference. To deal with the space interference, the most effective way is to add shielding cover ( Don't think adding shield is optional) 。 Power distribution cabinet is a good shield. But the shield are helpless to interference from inside. Due to relay contactor in general assembly even in inside the distribution cabinet, relay at the instant of the disconnect will produce a high frequency interference, the interference will by space radiation, interfere with the PLC. At that time, on the layout of the power distribution cabinet interior has certain requirements. PLC controller should as far as possible away from relay and relay control large current cable, to reduce the space radiation interference. If the interference is still severe, can consider to use tin foil wrapped PLC, equivalent to add a shield to PLC alone.

at the above content, some equipment engineer, there will be a wonder: 'I do, Not according to the requirements of the above) For decades, and no problems what ah '? Although the equipment at work, but it is not best, belong to 'work' in spite of illness.

how about technology zone in order to improve the anti-interference ability of industrial control equipment? First to the correct use of PLC under the age of the Internet industry, industrial control system for the future development trend? Internet industry scale will exceed 440 billion yuan in 2020, the development of 3 d printing are welcomed more rational, the international competition in the market environment in manufacturing speed toward intelligent, efficient, automated direction
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