外文文献原稿和译文
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Introduction
PLC-Programmable Logic Controllers are widely used in recent years the field of industrial control Such as metallurgy, steel, production lines, etc Its main feature is its stable performance, high control precision and easy maintenance. With PC connection, compiled in the production process according to the corresponding program will convert digital signals into analog signal input commands output instructions to control the implementation of components to achieve automatic control purposes. Currently, the main aspects of the music program-controlled fountain imported lighting console and its matching control decoder, once the failure is not easy to repair, the price is more expensive. Using PLC technology, you can use an ordinary PC to replace imported lighting control, easy maintenance, low cost PLC article on how to use music technology to analyze the problem of program-controlled fountain.
PLC's programmable fountain
Fountain is the use of the work produced by the pump pressure, nozzle jet out from the water column, the number of pumps in accordance with a certain type, location, installation, combining different types of nozzles, can have a variety of flower. We can each pump as a working point, programming, the module through the PLC to control each point, that is, through the implementation of the loop on each pump, or gear engagement control, to control the pump The purpose of the work of the state.
To demonstrate the artistic fountain, usually accompanied by a corresponding track, according to the rhythm of the selected track speed, cadence, the preparation of the appropriate pump control procedures to reflect the music's meaning. The most important aspect is the time synchronization, the music is about playing time based on rhythm and sense of music divided into several time periods, the preparation of the corresponding time period in each of the pumps, lighting control program, the precision adjustment of track time and PLC accuracy of programming the same time, but at the same time period,
water pumps and lighting same working hours as a subroutine to achieve synchronization in the visual viewing.
At night with lights to enhance the fountain of viewing, optional programmable control of the LED lighting, through the RS485 interface access control, to be completed by their centralized control. According to the light color, light floral point of view, music tracks for the preparation of procedures, working hours have lights and music, pump time synchronization, the principle and the control of pumps on the same principle, will not repeat them here.
Implementation steps   
Pump control
According to the model pump, flower shape and distribution of the location, the uniform numbers, and the number of points with the number-one correspondence PLC module, the pump will be the same flower formation, flower-shaped water pump for each work ord
er, work (as a whole or separately ) for permutations and combinations, preparation of the corresponding subroutines and numbered, giving the corresponding number of working hours to control the pump working hours, working hours type of sustainable, can also be stopped, the performance of both static and dynamic form of
In addition, by adding the drive to track the performance of a flower-shaped soft, add the beauty of the fountain. Between the PLC and inverter in the corresponding equivalent between the PLC's digital signal is converted to analog converter controls the pump speed signal, the dynamic work of pump status, and then flower the shape of the requirements of its permutations and combinations, preparation of subroutine and the corresponding number.
Lighting control
According to the color of light (preferably choose red, yellow, and blue primary colors), the installation location, radiation angle, the lighting state of the permutations and combinations of work, preparation of the corresponding routines, giving the corresponding
number of working hours, time and type of flower-shaped water pump , values consistent with the color can be the same, you can also reflect the dynamic inconsistency can also be a two or a superposition of three colors to produce other different colors, rich colors of light.
Time synchronization
decoderThis is the entire music program-controlled fountain control the most important and most critical part, because the music program-controlled fountain show the overall effect of the coordinated directly with the time synchronization has a very close relationship, if time synchronization is different, it will lead to music, floral and lighting are not a whole, viewing greatly reduced, so this link is the core link.
"Time synchronization" here includes the three levels of time. First, is the precision of music playback time and the PLC control program consistent with the precision of time, and while the relationship between the two start and stop; Second, according to the rhythm of music tracks, the momentum of the play by length of time, with the correspondi
ng pumps, lights the continuing work of the subroutine the same length of time, that is, the pump light to flower and produce the music and change tracks, or watch when there will be music, flower-shaped and light three close enough relationship between, there is a feeling out of touch dissonant; Third, at the same time period, flower-shaped water pump and lighting the work routine time, consistent with persistent or intermittent, the time to consider the specific values of human persistence of vision time, this flower-shaped water pump and lighting will form a whole, both start and end, uniform, flower-shaped one on one program and lighting program can also be many to many, rich ornamental effect.

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