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1、外文资料Application of Control System on the Base of PLC in power-supply systemThe paper introduces a distributed control system of sewage treatment, and the core of the system is PLC. The structure of the control system, the assignment and implementation of the tasks, the control scheme and the design
2、concept of program are expounded. The way of central monitoring management and dispersing control is used by the control system; the long一distance control and monitoring of field equipment are uncharged of the upper computer; the software program of designs uses Intouch7. 0. The specific technology,
3、 equipment, the controlling of main parameter and several running data are uncharged of the PLC stations, and the software program of designs uses Concept 2.2XL with online tracking and outline simulating. MB+ net is adopted by the communication between the upper computer and the PLC stations, with
4、its simply build ingnet, quickly running and stable communication. The automatic control of PLC has been successfully completed in sewage treatment, which has improved the operation efficiency and management level of sewage treatment equipmentIntroduced to take PLC as the distribute type control sys
5、tem of core in the wastewater treatment system of apply.Concretely described the structure, mission of the control system an allotment and carry out, the way of control and the thought of the program design. The way controled the concentration monitor of the system adoption a management and scattere
6、d a control, the place of honor machine be responsible for the spot the long range of the equipments control and surveillance, software adoption Intouch7. 0 draw up.The PLC native station is responsible for to the concrete craft, equipments and is mainly controled parameter to carry on control and c
7、ollect various movement data, the program design adoption have on-line follow with off-line imitate the Concept of true function 2. 2 XL software.Place of honor machine and of the PLC adoption set the net be quickly simple and circulate speed, correspond by letter the stability strong MB+net.The who
8、le control system successfully solved the PLC controls a problem in the automation within wastewater treatment and raised a wastewater treatment equipments to circulate an efficiency and manage level.Recently, for carrying out high quality, low consume, stable dependable movement.Domestic and intern
9、ational many wastewater treatment factorieses adopted a modern forerunner to control technique and calculator technique and constitute calculator direct, control thus, manage system.Make system excellent to turn movement.But the programmable logic controller(PLC) then take microprocessor as core.Syn
10、thesize the calculator technique automatically controls technique and correspondence technique but develops of a kind of new and in general use utomatic control device.Have structure simple, function superior, dependable sex Gao, work properly words in general use, be easy to plait distance, usage c
11、onvenience etc. advantage etc.The silver Chuan City the first wastewater treatment factory adopted a SBR craft and take PLC as the control system of core, day after handling the sewage 10 104 t the processing of reach mark sewage can used for an agriculture irrigation.1Control system structureContro
12、l the way of concentration monitor management, scatter a control of the system adoption.The emulation hold, place of honor machine, gather a line machine, printer to Be located on medium control room, two set PLCs are located on control the spot.Adopt this kind of structure can make the information
13、in the production line can centralized management with carry out whole operation, management with excellent turn.Also make to control dangerous dispersion in the meantime, raise the system credibility.11The upper computersMedium control two calculator adoption PII class works of room to control mach
14、ine, circulate the operate system of Windows NT.The place of honor machine be responsible for on the scene establish each long range control(full-automatic control, automatic control, order to move a control) with surveillance, make use of Intouch7. 0 engineering software packages provide a good per
15、son machine dialogue boundary but obtain concerning parameter and equipments appearance information from the PLC by searching a way, keep a view manifestation to come out on the CRT by good sketch type, print a necessary data in the meantime and be provided for lord to control and manager instructio
16、n produce.Supervise and control boundary but include the system total diagram, system cent diagram, imitate the quantity general chart, parameter a constitution, report to the police a window, history trend and register a window etc. boundary but.In the system total diagram, circulate the personnel
17、can keep watch on signals, such as all movement appearances, equipments trouble and liquid which control an equipments and discharge.etc.Operate a personnel in the system the cent the diagram can carry on a single machine point to move to circulate an operation to all control equipmentses, become th
18、e set automatically circulate operation or the whole factorieses full-automatic operation combine surveillance.In the meantime place of honor machine 2 and do a plait distance a machine.Medium control room to establish another an inset type emulation to hold, is been one control by the place of hono
19、r machine, in order to keep the craft process of the view manifestation whole factory and main parameter value.12The PLC standAccording to wastewater treatment of two part, the spot the long range of the equipments the control output and the spot the signal collect to control a station completion fr
20、om two PLC wood ground.PLC1 native control station control the space grid, sewage promote a pump house, Pu spirit to sink sand ponds etc. to prepare a processing part.The PLC2 native control station controls dirty mire to dehydrate, press to filter machine etc. department.PLC3 native control station
21、 control SBR living creature processing part.Moreover, the on the spot native control station is each to establish an operation terminal to establish each, be responsible for at native to establish each control on the scene.（automatic control, order to move a control）The spot is each the physical pa
22、rameter that the supervision order and include water level, temperature, discharge and turn soon, electric currents etc. imitate quantity, from to in response to of an appearance spread a feeling machine or change to send to a machine examination to come out and change into the electric current sign
23、al of the 420 mA, through shield inside the PLC that the electric cable sends to each statures system, from the PLC picks up a people through various mold piece sample telecommunication number.Same, imitate quantity control the signal send to performance organization by the 420 mA electric current f
24、orm after being output by the PLC, control performance organization of action.The Modicon Quantum series PLC of Schneider company is satisfy liberal of, according to standard of network conjunction and the spot total line conjunction etc. application the technique provided various network a choice,
25、support Modbus, Mod-bus Plus(MB+), the long range I/0, TCP/IP etc. network conjunction, have stronger and vivid.Therefore, the wastewater treatment is convenient to arrive of the PLC choose the series of Modicon Ouantum of use Schneider.13CorrespondencesMB+agreement is the Modicon company release of
26、 an open type of the adoption IEEE802. 4 correspond by letter 5 agreements the spot total line of card agreement.MB+the network together other networks compare to have a set of net simple, the investment be little, network speed quick, correspondence the stability strong etc. characteristics, it mak
27、e calculator, controller and other data sources through an usage double wring line or fiber optic cable Be a body to together carry on correspondence at the whole network top.But the CPU mold piece of the Modicon Quantum series PLC imply MB+correspondence, therefore correspond by letter a network to
28、 choose to use MB+network.Medium control two machine, two control stations with native PLC of room to pass MB+the network link together.The PLC CPU mold piece passes MB+correspondence and two machines carry on data commutation and collect the place of honor supervision various operation instruction
29、of the system and the spot the examination signal and data, through analysis handle, pass exportation mold piece to control object output control signal;In the meantime, the PLC passes MB+net upward the machine return to various data, place of honor machine logarithms according to carry on an operat
30、ion processing, show various signal and print various statement.2The design of PLC control programThe system has four kinds of control methods:The native hand moves a control, single set equipments point moves a control, become a set, the equipments automatically controls, the whole factory equipmen
31、ts full-automatic control.Two kinds of ex- with general methods at establish each adjust to try or maintain usage, the system is mainly circulate with full-automatic control.Under this kind of way, all each kind of equipmentses from PLC according to in advance draw up of procedure auto control, dont
32、 need to operate a personnel an intervention.Various spot data spreads a highest machine through a PLC, come out in the place of honor on board description and make the craft, equipments movement of whole factorieses get an overall control.The living creature processing part of the PLC3 station cont
33、rol is the whole wastewater treatment of key part, be limited by space, only with the PLC3 stand of program design for example.21Process of controlThe PLC3 stationses were use to control to get into Pu spirit from sewage, the pond is everywhere sewage run off Pu after manage spirit the whole process
34、 of the pond.Include turn of sequence and time- switch moderate breezes machine of control various valve, pump, breeze machine to soon regulate etc. in this process.The Pu spirit pond is the core of wastewater treatment to construct a thing, sewage is to come and go through a microbial living creatu
35、re oxygenation in the pond in addition to organic matter, the processing effect of content to sewage of the oxygen in water is to go to a pass important.Request according to the SBR craft, the deliquescence oxygen in the Pu spirit pond content usually controls within the scope of 13 mgs/L and annoy
36、a stage end to fuse an oxygen content in the Pu should be not over the 2 mgs/L.Contain the oxygen once measured low or lead Gao, all will influence a fluid matter quantity.Handle 4 sets of the 10 104 t the SBR of 8 pond modes to respond pond to the day, each one responds that the pond go together wi
37、th a pedestal from change Pin machine control of breeze machine, used for annoying pond Pu spirit to by turn provide oxygen toward two Pus.Establish 4 pieces of deliquescence oxygen test instruments in the different location of each Pu spirit pond, measure contain of sewage amount of oxygen in pond,
38、 the PLC separates a 5 mins to examine a deliquescence oxygen in a Pu spirit pond value each time, according to fuse oxygen of average value to control breeze machine to turn soon.If fuse oxygen low limit at the bottom of the enactment, the frequency modulation breeze machine turns to soon increase
39、5%;If fuse oxygen Gao while set upper limit, the frequency modulation breeze machine turns to soon lower 5%.So, carried out Pu spirit pond to provide automatically regulate of the amount of oxygen, since avoided unnecessary energy loss, again excellent turned movement craft.22The design of PLC progr
40、amThe adoptive plait distance software is a Concept 2. 2 XLs.Concept is according to under the Windows of the PLC plait distance tool, have good customers interface, and have on-line follow and off-line imitate true function.The control procedure of PLC3 stationses is divided into five procedure mol
41、d piece.（1）Public mold pieces of procedure use-include a beginning to start to turn part, hour cent second etc. ask pulse unit, SBR to respond a period enactment, fuse oxygen enactment.etc.（2）Order control mold pieces of the switch quantity -the coordination control report to the police of circulate
42、 and related breakdown of equipmentses, such as each valve, pump and breeze machine.etc. The enter of SBR pond spirit valve, enter water valve, reflux pump, surplus dirty mire pump from PLC according to the craft of the wastewater treatment period time segment control, water valve from PLC according
43、 to craft time and super voice liquid the measured value of the instrument to control.（3）Protection mold pieces of the off-power-system power failure after, the PLC saves all appearance locks and make after treating to add an electricity PLC instauration keep of the appearance continue to circulate.
44、（4）Mold pieces of correspondences -use to complete PLC and various data transmission of place of honor machine.（5）Fuse an oxygen value to automatically regulate a mold piece-according to fuse an oxygen value to regulate breeze machine to turn soon and report to the police of related breakdown.The ta
45、rget which regulates to turn soon promises the be worth of deliquescence oxygen as 2 mgs/L in the whole Pu spirit period.Adoptive control strategy is as follows:The Pu spirit period beginning, the breeze machine at top speed movement attains a 2 mgs/L in shorterly of the hour ask by making deliquesc
46、ence oxygen and take 5 mins as a period to examine deliquescence oxygen to be worth in the meantime.When fuse an oxygen value big at the 2 mgs/L, the breeze machine turns to soon descend 5%;When fuse an oxygen value small at the 2 mgs/L, the breeze machine turns to soon rise 5%.If the breeze machine
47、 turns to soon rise to allow of tallest turn soon, fuse an oxygen value return small then maintain tallest to turn soon at the 2 mgs/L.This kind of circumstance may annoy the last phase of period to appear in the Pu, but also will not clearly influence wastewater treatment quality.Supervise and cont
48、rol an exportation electric current of change the Pin machine value at any time in the Pu the spirit of the whole period, make it not exceed change the sum of Pin machine settle a value.If meet a surprised circumstance to make to output electric current exceed when the sum settle value, immediately
49、lower breeze machine to turn soon.If the breeze machine turns to soon decline to allow of lowest turn soon, output electric current to return exceed the sum settle a value, then stop breeze machine and send out to report to the police signal in the meantimeAlong with automatic control technical development, the UNITANK craft more and more gets extensively applied.Regard experience as principle currently, use DO, time, discharge as a craft control parameter, adjust the Pu spirit circulate of machine and