1 Introduction In life, we always produce a lot of sewage. With the increase of the amount of sewage, how to deal with it has become a problem that must be solved. At present, we generally use the activated sludge method for treatment, which is a secondary biological treatment. The treatment effect is good and the ability is strong. However, there are also many disadvantages, namely, high cost, difficult management, and easy occurrence of adverse reactions such as sludge expansion and sludge floating, and the inorganic nutrients such as nitrogen and phosphorus in the water can not be removed. If this water is used again, it will undoubtedly cause harm to the human body. This kind of treatment is not suitable for China's development status to a certain extent, because it does not conform to China's "sustainable development" strategy, because sewage treatment is to reduce environmental pollution and protect the environment, but this way of treating sewage will A lot of money is spent, and the reality of the shortage of per capita resources in our country is that there is no guarantee. 2. PLC realizes the design description of water treatment system Sewage treatment is actually the purification of sewage, and then into the production of life, that is, to ensure the recycling of water resources. When the "automatic state" is turned on, if the control switch of the canister is turned on, the canister will be automatically filtered. When the "manual state" is turned on, if the control switch of the canister is turned on, the filter can requires a certain person to operate and control to complete the sewage treatment work. The filter will also be gradually contaminated as the work progresses. At this time, the cleaning work needs to be carried out. At this time, the water in the filter is removed in the first step. During the drainage process, the filter inlet and outlet valves are closed. The drain and exhaust valves are opened, and then the backwash pump is activated to purify the filter. 3. PLC programming 3.1 Opening process of sewage treatment system Figure 1 is the opening process diagram of the sewage treatment system. From the figure, we can read out the information, the normal opening is 0000 and 0006 respectively, the coil is 1002, and in the case of normally open 0000, a self is also set. Guarantee 1002. Self-protection means protecting the normal operation of the whole system. If there is something wrong with the system, then it is necessary to play the role of self-protection. It can be said that self-protection is an indispensable part of the whole sewage treatment system. The main function of this procedure is to open the system to ensure the normal operation of the sewage treatment process. If the normally open is 0000 and the coil is 1002, it means that the intervention of the staff is needed at this time, and the sewage is treated automatically or manually. If the normally open is 0006, then the whole system is closed, but if If the indicator of the 1002 is in the steady state, it indicates that the work is still in progress, so the 1002 has self-protection capability. 3.2 Automatic and manual operation of the sewage treatment system Figure 2 is a description of the two operation procedures of the sewage treatment system automatically and manually. From the figure, we can know that in the automatic state, normally open 0001, normally open 0006, normally closed 1004, coil 1003, and in the normally open There are two kinds of instructions below, one is normally open 1003, at this time is in a state of self-protection, based on the importance of self-protection, it must ensure the setting state of normally open 1003, at this time, in the self-protection normally open 1003 There is also a normally open TIM003. This normally open function is to ensure the connectivity of the system. The lack of this command will hinder the industrial process behind the device. At this time, if a coil 1003 is added after this, the stability of the system is greatly increased for a long time, and the effectiveness of the filtering effect is ensured.
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1. Frequency Range: 20Hz - 20KHz
2. Impedance: 32 Ohm
3. Sensitivity: 108dB+/-5dB(93db)
4. Speaker: 40MM
5. Plug Type: 3.5mm Stereo
6. Length of Cable: About 1.2m -1.5m