CN102156464B - Small automatic sewage treatment control system - Google Patents
Small automatic sewage treatment control system Download PDFInfo
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- CN102156464B CN102156464B CN 201110074775 CN201110074775A CN102156464B CN 102156464 B CN102156464 B CN 102156464B CN 201110074775 CN201110074775 CN 201110074775 CN 201110074775 A CN201110074775 A CN 201110074775A CN 102156464 B CN102156464 B CN 102156464B
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Abstract
The invention discloses a small automatic sewage treatment control system. The system comprises a central control machine, a printer and a controller; and the printer is connected with the central control machine, and the controller is connected and communicated with the central control machine by adopting an RS-485 communication network through a twisted pair. The controller consists of a switch power supply module, a central processing unit (CPU) module, an RS-485 communication module, a switching value input board, a switching value output board and an analog input circuit; the switch power supply module is respectively connected with and supplies power to the CPU module, the RS-485 communication module, the switching value input board, the switching value output board and the analog input circuit; the CPU module is connected with the RS-485 communication module to establish communication with the central control machine; and the switching value input board is connected with the CPU module, the analog input circuit is connected with the CPU module, and the switching value output board is connected with the CPU module. The technology is simple and easily mastered, and the system has low investment cost and low operation and maintenance costs and is economical and practical.
Description
Technical field
The present invention relates to a kind of Water Treatment Automatic Control System, particularly for the automatic control of small-scale wastewater treatment.
Background technology
In recent years, along with the quickening of China's the Course of Urbanization, town development had obtained fast development.Yet, samll cities and towns are in fast economic growth, also brought increasing sharply of sanitary sewage and industrial waste water, add general serious hysteresis of samll cities and towns' infrastructure construction, lack necessary sewage treatment facility, not only directly destroy samll cities and towns self ecologic environment, and caused the severe contamination of river (river), lake (storehouse) water body, become the important pollution source of regional water environment.
Because being decentralized, samll cities and towns distribute, wastewater treatment small scale, load variations are large, operational management is proposed requirements at the higher level, added Economic Development of Small Towns level operational management personnel low, that extremely lack training and be always or usually as specified, be difficult to grasp processing procedure and equipment with the operative technique complexity.If simply apply mechanically large (in) the automatic control system pattern of urban sewage treatment process process, control system complex structure not only, and have that initial investment is high, maintenance cost is high, be difficult to the problems such as normal operation.
Summary of the invention
The purpose of this invention is to provide a kind of small automatic control system for sewage treatment, its technology is simple, be easy to grasp, and cost of investment is low, operation and maintenance expense is few, economic and practical.
Small automatic control system for sewage treatment of the present invention, it comprises middle control machine, printer and controller, printer is connected with middle control machine, controller adopts the RS-485 communication network to be connected communication by twisted-pair feeder with middle control machine, and it is characterized in that: described controller is comprised of switch power module, CPU module, RS-485 communication module, switching value tablet, digital output module, simulated measurement input circuit; Switch power module is connected respectively power supply with CPU module, RS-485 communication module, switching value tablet, digital output module, simulated measurement input circuit; The CPU module is connected with the RS-485 communication module, set up with middle control machine between communicate by letter; The switching value tablet is connected with the CPU module, and the switching value signal of wastewater treatment field apparatus is sent into; Simulated measurement input circuit is connected with the CPU module, and the analog signals of wastewater treatment field instrument is sent into; Digital output module is connected with the CPU module, and the switching value control signal after processing is sent.
The simulated measurement input circuit of described controller, CPU module, RS-485 communication module are directly done on CPU board; Described CPU module comprises watchdog circuit, real-time clock, single-chip microcomputer and the first code translator; Single-chip microcomputer is connected with watchdog circuit, occurs when preventing the watchdog routine operation " endless loop ", and single-chip microcomputer is carried out the EEPROM of under-voltage protection and expansion single-chip microcomputer; Single-chip microcomputer is connected with real-time clock, is used for timed power on/off; Single-chip microcomputer is connected with the first code translator, sends the I/O plate and selects signal; Single-chip microcomputer and simulated measurement input circuit adopt the photoelectricity isolation to be connected, and convert the analog signals of wastewater treatment field instrument to digital signal and send into single-chip microcomputer.
The switching value tablet of described controller comprises that the first photoelectrical coupler, input buffer, the second code translator and plate select J201; The switching value input signal enters the input buffer that is connected with the first photoelectric coupler output end by the first photoelectrical coupler input end, the output terminal of input buffer is connected with single-chip microcomputer, the switching value input signal is sent into single-chip microcomputer, the gating end of input buffer is connected with the second code translator, a gating end of the second code translator connects single-chip microcomputer, and another gating end selects J201 to connect the first code translator by plate.
The digital output module of described controller comprises that the 3rd code translator, plate select J401, output latch, the second photoelectrical coupler; The input end of the 3rd code translator with is connected a gating end and connects respectively single-chip microcomputer, another gating end selects J401 to connect the first code translator by plate, output terminal connects the clock end of output latch; The input end of output latch is connected with single-chip microcomputer, output terminal connects the input end by the second photoelectrical coupler, and the switching value control signal after single-chip microcomputer is processed outputs to the wastewater treatment field apparatus by output latch, the second photoelectrical coupler.
Further, the switching value tablet of described controller also comprises diode and electric capacity, and described diode and Capacitance parallel connection absorb peak voltage at the input end of the first photoelectrical coupler.
Further, the digital output module of described controller also comprises stamp-mounting-paper diode, and described stamp-mounting-paper diode is connected in parallel on the output terminal of the second photoelectrical coupler.
Beneficial effect of the present invention is:
1. controller only, control machine (host computer) in can be realized the full-range automatic control of small sewage treatment plant; Various field apparatus real time execution/halted states, normal/fault state monitoring; Field instrument parameter acquisition, demonstration; The inquiry of historical data and generating report forms; The functions such as fault diagnosis expert system.
2. the controller hardware structure adopts modular design, can satisfy the requirements for automatic control of different scales small-sized sewage treating system, and middle control machine and controller communication distance can reach 1500m.
3. function of the MCU is expanded, increased watchdog circuit, real time clock circuit.Between CPU module and the RS-485 communication module, between single-chip microcomputer and the simulated measurement input circuit, between switching value tablet, digital output module and the peripheral circuit, all adopted the photoelectricity isolation, separately separately power supply; Working power adopts finished product technical grade Switching Power Supply, system is not only moved more reliable, stable, also has the characteristics of significant data energy long preservation.
4. system's components and parts and chip economy, maturation, applicable, the control system function is complete, cost is low, easy to maintenance.
Description of drawings
Fig. 1: small-scale sewage process control system structural drawing.
Fig. 2: controller hardware structural drawing.
Fig. 3: switch power module schematic diagram.
Fig. 4: CPU board schematic diagram.
Fig. 5: switching value tablet schematic diagram.
Fig. 6: digital output module schematic diagram.
Fig. 7: controller monitoring program main flow.
Fig. 8: CSRC software function module structural drawing.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Small automatic control system for sewage treatment as shown in Figure 1 and Figure 2, comprise middle control machine 1, printer 2 and controller 3, printer 2 is connected with middle control machine 1, controller 3 adopts the RS-485 communication network to be connected communication by twisted-pair feeder with middle control machine 1, and controller 3 is comprised of switch power module 4, CPU module 21, RS-485 communication module 6, switching value tablet 7, digital output module 8, simulated measurement input circuit 9.Switch power module 4 is connected respectively power supply with CPU module 21, RS-485 communication module 6, switching value tablet 7, digital output module 8, simulated measurement input circuit 9; CPU module 21 is connected with RS-485 communication module 6, set up with middle control machine between communicate by letter; Switching value tablet 7 is connected with CPU module 21, and the switching value signal of wastewater treatment field apparatus 10 is sent into; Simulated measurement input circuit 9 is connected with CPU module 21, and the analog signals of wastewater treatment field apparatus instrument is sent into; Digital output module 8 is connected with CPU module 21, and the switching value control signal after processing is sent.
As shown in Figure 3, the switch power module 4 of controller 3 comprises 6 magnetic beads, electric capacity, 2 D.C. regulated power supply LM7805,2 isolation module B0909S-1W and B0505S-W1, forms 4 groups of power supplys outputs, is respectively other module for power supply.
As shown in Figure 4, the simulated measurement input circuit 9 of controller 3, CPU module 21, RS-485 communication module 6 are directly done on CPU board 5; Described CPU module 21 comprises watchdog circuit 11, real-time clock 12, single-chip microcomputer 13 and the first code translator 14.Single-chip microcomputer 13 models are the AT89S52 that atmel corp produces, and the chip model of watchdog circuit 11 is X25045, and the model of real-time clock 12 is DS1302Z, and the model of the first code translator 14 is 74HC138.The P0.0-P0.7 pin of single-chip microcomputer 13 is connected to pull-up resistor.Single-chip microcomputer 13 adopts the spi bus interface mode to be connected with watchdog circuit 11, occurs when single-chip microcomputer 13 is prevented the watchdog routine operation " endless loop ", and single-chip microcomputer (13) is carried out the EEPROM of under-voltage protection and expansion 4KB; The X25045 chip has 8 pins, and wherein the 3rd, 8 pins connect the VCC power supply, the 4th pin ground connection; Sheet selects input end CS, serial data output terminal SO, serial clock input end SCK, serial data input end SI to link to each other with P1.0, P1.1, P1.2, the P1.3 pin of single-chip microcomputer 13 (being AT89S52) respectively; Reset output terminal RST links to each other with the 9th pin (RESET) of AT89S52.Single-chip microcomputer 13 is connected with real-time clock 12, is used for timed power on/off; The 1st, 8 pin of real-time clock 12 (being DS1302Z) connect power supply, the 4th pin ground connection, and the 2nd, 3 pin connect crystal oscillator, and the 5th, 6,7 pin link to each other with P1.6, P1.5, the P1.4 pin of AT89S52.Single-chip microcomputer 13 is connected with the first code translator 14 (being 74HC138), sends the I/O plate and selects signal; The 1st, 2,3 pin of the first code translator 14 link to each other with P2.2, P2.3, the P2.4 pin of AT89S52, and the 4th, 5 pin link to each other with the P2.5 pin of AT89S52, and the 6th, 16 pin connect the VCC power supply, the 8th pin ground connection, the 7th, 9, the external pull-up resistor of 10-15 pin.Single-chip microcomputer 13 and simulated measurement input circuit 9 adopts the photoelectricity isolation to be connected, and converts the analog signals of field instrument to digital signal by simulated measurement input circuit 9 and sends into single-chip microcomputer; Simulated measurement input circuit 9 comprises analog to digital converter ADC0809CCN and shift register 74HC165; The analog quantity that the instrument to collect of the input end IN0-IN7 pin input wastewater treatment field apparatus 10 of ADC0809CCN arrives, after analog to digital conversion, output to the A-H leads ends of the 74HC165 that links to each other with the D0-D7 pin, export by the Q pin of 74HC165 again, and after photoelectricity isolation, connect the T0 pin of single-chip microcomputer 13, signal is sent in the single-chip microcomputer; After isolating by photoelectricity, channel selecting end ADD A, the ADD B of ADC0809CCN, ADD C pin connect P2.2, P2.3, the P2.4 pin of single-chip microcomputer 13, all receive the P3.6 pin of single-chip microcomputer 13 after the address latch end ALE pin of ADC0809CCN and starting end of convert START pin are isolated by photoelectricity, connect respectively P3.3 pin, the P3.5 pin of single-chip microcomputer 13 after the clock end CLK pin of 74HC165, control end SH/LD pin are isolated by photoelectricity.
The X25045 chip is a kind of programmable control circuit that integrates house dog, voltage monitoring and three kinds of functions of serial EEPROM.Wherein house dog provides defencive function to system; in the single-chip microcomputer normal workflow, arranged instruction timer access X25045; when single-chip microcomputer is interfered; program can not be carried out according to normal flow; when not accessing X25045 above predetermined time; X25045 will force monolithic processor resetting, thereby make single-chip microcomputer work recover normal.X5045 voltage monitoring function can protection system be avoided the impact of low-voltage.When supply voltage drops to allowed band when following, system will reset, until supply voltage returns to stationary value.The minimum storage life of its EEPROM internal data is 100 years, and is erasable more than 1,000,000 times.
RS-485 communication module 6 on the CPU board 5 also can adopt the MAX487E communication module to realize and the communicating by letter of middle control machine 1.
As shown in Figure 5, the switching value tablet 7 of controller 3 comprises that 32 the first photoelectrical couplers 15,4 input buffers 16,1 the second code translator 17,1 plate select diode and the electric capacity of J201 and 32 groups of parallel connections.The model of input buffer 16 is 74HC244, and the model of the second code translator 17 is 74HC138; 32 switching value signals enter 4 input buffers 16 that are connected with photoelectric coupler output end by 32 the first photoelectrical coupler 15 input ends, each input buffer 16 input end receives 8 switching value signals, 8 pins of output terminal are connected with the P0.0-P0.7 pin of single-chip microcomputer 13, two gating ends of 4 input buffers 16 are connected with the Y0-Y3 pin of the second code translator 17, the A of the second code translator 17, the B pin connects respectively the P2.0 of single-chip microcomputer 13, the P2.1 pin, gating end E1 pin is connected with the P2.6 pin of single-chip microcomputer 13, another gating end E2 pin selects J201 to meet the output terminal Y0-Y7 of the first code translator 14 by plate, is used for selecting this switching value tablet; The diode of 32 groups of parallel connections and Capacitance parallel connection are used for absorbing peak voltage at the input end of 32 the first photoelectrical couplers 15.The effect of switching value tablet 7 is that the switching value input signal is sent into single-chip microcomputer 13.
As shown in Figure 6, the digital output module 8 of controller 3 comprises that 1 the 3rd code translator 18,4 output latches 19,32 the second photoelectrical couplers 20,1 plate select J401 and 32 stamp-mounting-paper diodes.The input end A of the 3rd code translator 18, the B pin connects the P2.0 of single-chip microcomputer 13, the P2.1 pin, gating end E1 connects the P2.7 pin of single-chip microcomputer 13, another gating end E2 pin selects J401 to meet the output terminal Y0-Y7 of the first code translator 14 by plate, be used for selecting this digital output module, the output terminal Y0-Y3 pin of the 3rd code translator 18 connects the clock end CLK pin of 4 output latches 19, the input end D1-D8 pin of each output latch is connected with the P0.0-P0.7 pin of single-chip microcomputer 13, output terminal Q1-Q8 pin connects the input end of 8 the second photoelectrical couplers 20,4 output latches are connected with 32 the second photoelectrical coupler input ends, have 32 switching value control signals; The output termination wastewater treatment field apparatus of 32 the second photoelectrical couplers, and 32 stamp-mounting-paper diodes in parallel.Switching value control signal after single-chip microcomputer 13 is processed outputs to the wastewater treatment field apparatus by output latch 19, the second photoelectrical coupler 20.
According to sewage treatment plant's scale difference, can configure switching value tablet and the digital output module of varying number, connect the output terminal of the first code translator by the plate choosing, with single-chip microcomputer switching value tablet, the digital output module of concrete use are selected.
Single-chip microcomputer 13 (AT89S52) among the present invention has 40 pins, wherein, 32 two-way I/O in outside (I/O) port is arranged; 2 outer middle fractures; 3 16 programmer timing counters; 2 full duplex serial communication ports; 2 access hole lines.Except the pin of above-mentioned connection, other pin is: pin X1 (19 pin) and X2 (18 pin) are the oscillator input/output port, external 12MHz crystal oscillator; RESET (9 pin) is the RESET input mouth, the reset circuit that outer meeting resistance electric capacity forms; VCC (40 pin) and GND (20 pin) connect respectively+positive and negative terminal of 5V power supply for the power supply port, 3 groups of general programmable I/O mouths, and each mouth has 8 Tiaokou lines.In the present embodiment, the functional definition of each mouthful line such as table 1:
The functional definition of table 1 I/O mouth
According to the sewage treatment process requirement, the software of controller 3 of the present invention can be realized following functions: the input of (1) switching value, output; (2) analog input; (3) timer (according to predetermined time the interval carry out a certain operation); (4) order of control machine 1 in the basis arranges and storage technology process control command sequence (pseudoinstruction process); Communicate by letter with middle control machine 1, on-site parameters is transferred to middle control machine; The control command that the control machine is sent in the execution; Carry out the order of field control switch, button, start, suspend or stop control flow.
Its control procedure is as follows:
As shown in Figure 7, controller 3 watchdog routine control cycles are 40ms, and namely every 40ms makes single pass to whole input/output points, and field working conditions is collected middle control machine internal memory, and control according to operating mode, time and predetermined algorithm, and control signal is exported.
As shown in Figure 8, middle control machine 1 of the present invention can be achieved as follows function:
1) field apparatus Long-distance Control
The CSRC software of middle control machine 1 can send steering order according to the setup control strategy, finishes corresponding actions by field apparatus.According to different demands for control, can adopt manual and automatic dual mode that field apparatus is carried out centralized control.Generally speaking, program will be in automatic mode, and when emergency condition, changeable is that manual control model is to finish manual operation.
2) field apparatus real-time status and data show
The CSRC software of middle control machine 1 is set the sampling period according to actual needs, and timed sending data acquisition instruction is sent to host computer after the field controller collection site primary instrument data.After central supervisor was processed the data of receiving accordingly, the correspondence position at the host computer interface showed.
3) the inquiry of historical data and generating report forms
The CSRC software of middle control machine 1 deposits in the real time data that gathers in the database automatically, the user can carry out according to the different inquiry periods query manipulation of historical data such as week, month, year etc., the data obtained will show with diagrammatic form, make things convenient for the user to check data trend figure.Meanwhile, can in software, automatically generate the historical data report in the different time sections if needed, print the formation paper document.
4) fault diagnosis expert system
Expert system integrated in the software has: the training functions such as (1) sewage treatment process introduction, operating guidance; (2) query function such as sewage treatment plant's working drawing, equipment for sewage treatment technology initial parameter; (3) sewage treatment facility, equipment maintenance and management function; (4) the contingent abnormal occurrence of processing procedure is carried out analysis-by-synthesis, propose the function of expert diagnosis suggestion and solution.
Claims (3)
1. small automatic control system for sewage treatment, it comprises middle control machine (1), printer (2) and controller (3), printer is connected with middle control machine, controller adopts the RS-485 communication network to be connected communication by twisted-pair feeder with middle control machine, and it is characterized in that: described controller is comprised of switch power module (4), CPU module (21), RS-485 communication module (6), switching value tablet (7), digital output module (8), simulated measurement input circuit (9); Switch power module is connected respectively power supply with CPU module, RS-485 communication module, switching value tablet, digital output module, simulated measurement input circuit; The CPU module is connected with the RS-485 communication module, set up with middle control machine between communicate by letter; Switching value tablet (7) is connected with the CPU module, and the switching value signal of wastewater treatment field apparatus is sent into; Simulated measurement input circuit (9) is connected with the CPU module, and the analog signals of wastewater treatment field instrument is sent into; Digital output module (8) is connected with the CPU module, and the switching value control signal after processing is sent;
The simulated measurement input circuit (9) of described controller (3), CPU module (21), RS-485 communication module (6) are directly done on CPU board (5); Described CPU module (21) comprises watchdog circuit (11), real-time clock (12), single-chip microcomputer (13) and the first code translator (14); Single-chip microcomputer (13) is connected with watchdog circuit (11), occurs when preventing the watchdog routine operation " endless loop ", and single-chip microcomputer (13) is carried out the EEPROM of under-voltage protection and expansion single-chip microcomputer; Single-chip microcomputer (13) is connected with real-time clock (12), is used for timed power on/off; Single-chip microcomputer (13) is connected with the first code translator (14), sends the I/O plate and selects signal; Single-chip microcomputer (13) and simulated measurement input circuit (9) adopt the photoelectricity isolation to be connected, and convert the analog signals of wastewater treatment field instrument to digital signal and send into single-chip microcomputer (13);
The switching value tablet (7) of described controller (3) comprises that the first photoelectrical coupler (15), input buffer (16), the second code translator (17) and plate select J201; The switching value input signal enters the input buffer (16) that is connected with the first photoelectric coupler output end by the first photoelectrical coupler (15) input end, the output terminal of input buffer (16) is connected with single-chip microcomputer (13), the switching value input signal is sent into single-chip microcomputer (13), the gating end of input buffer (16) is connected with the second code translator (17), a gating end of the second code translator (17) connects single-chip microcomputer (13), and another gating end selects J201 to connect the first code translator (14) by plate;
The digital output module (8) of described controller (3) comprises that the 3rd code translator (18), plate select J401, output latch (19), the second photoelectrical coupler (20); The input end of the 3rd code translator with is connected a gating end and connects respectively single-chip microcomputer, another gating end selects J401 to connect the first code translator (14) by plate, output terminal connects the clock end of output latch; The input end that the input end of output latch is connected with single-chip microcomputer, output terminal connects the second photoelectrical coupler, the switching value control signal after single-chip microcomputer is processed outputs to the wastewater treatment field apparatus by output latch, the second photoelectrical coupler.
2. a kind of small automatic control system for sewage treatment according to claim 1, it is characterized in that: the switching value tablet (7) of described controller (3) also comprises diode and electric capacity, described diode and Capacitance parallel connection absorb peak voltage on the former limit of the first photoelectrical coupler (15).
3. a kind of small automatic control system for sewage treatment according to claim 2, it is characterized in that: the digital output module (8) of described controller (3) also comprises stamp-mounting-paper diode, and described stamp-mounting-paper diode is connected in parallel on the output terminal of the second photoelectrical coupler (20).
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| CN 201110074775 CN102156464B (en) | 2010-12-16 | 2011-03-16 | Small automatic sewage treatment control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020661898 | 2010-12-16 | ||
| CN201020661898.4 | 2010-12-16 | ||
| CN 201110074775 CN102156464B (en) | 2010-12-16 | 2011-03-16 | Small automatic sewage treatment control system |
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| CN102156464A CN102156464A (en) | 2011-08-17 |
| CN102156464B true CN102156464B (en) | 2013-03-06 |
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| CN 201110074775 Expired - Fee Related CN102156464B (en) | 2010-12-16 | 2011-03-16 | Small automatic sewage treatment control system |
| CN2011200849015U Expired - Fee Related CN202003214U (en) | 2010-12-16 | 2011-03-16 | Small automatic control system for sewage treatment |
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| CN2011200849015U Expired - Fee Related CN202003214U (en) | 2010-12-16 | 2011-03-16 | Small automatic control system for sewage treatment |
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| CN101446823A (en) * | 2008-10-22 | 2009-06-03 | 环境保护部华南环境科学研究所 | Sewage disposal PLC process automatic control system |
| CN102156464B (en) * | 2010-12-16 | 2013-03-06 | 重庆大学 | Small automatic sewage treatment control system |
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| CN202003214U (en) | 2011-10-05 |
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