CN201858740U - Dehumidifier control system based on PLC (Programmable Logic Controller) - Google Patents
Dehumidifier control system based on PLC (Programmable Logic Controller) Download PDFInfo
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- CN201858740U CN201858740U CN 200920282941 CN200920282941U CN201858740U CN 201858740 U CN201858740 U CN 201858740U CN 200920282941 CN200920282941 CN 200920282941 CN 200920282941 U CN200920282941 U CN 200920282941U CN 201858740 U CN201858740 U CN 201858740U
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- programmable logic
- logic controller
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Abstract
The utility model discloses a dehumidifier control system based on a PLC, which comprises a programmable logic controller PLC, a transmitter, a signal input part, a contactor, a text displayer and an extended communication module. Control instructions can be obtained from a digital input terminal of the PLC, the text displayer or a top level computer. The system running state can be displayed on a digital output terminal of the PLC and the text displayer or transmitted to the top level computer. The acquired humidity and temperature signals are converted into usable frequency signals and accessed to a PLC high-speed counting input terminal which performs timer counting for obtaining a sampling value. The text displayer and the extended communication module facilitate the realization of local monitoring and controlling as well as remote computer monitoring and controlling on the dehumidifier control system. The dehumidifier control system which has the advantages of low cost, convenient use, flexible programming, high reliability, strong anti-interference performance, powerful man-machine interface functions as well as powerful communication functions is easy to be integrated in an on-site bus control system as an intelligent node.
Description
Technical field
The utility model relates to a kind of control system, especially utilizes PLC can realize the dehumidifier control system of frequency signal collection, local monitor and remote monitoring, specifically a kind of dehumidifier control system based on PLC.
Background technology
PLC a kind ofly changes the industrial control computer of control function with program because that it has function is strong, the reliability height, adaptive capacity to environment and antijamming capability are strong, and wiring is simple, programming flexibly, characteristics such as convenient and obtained extensive use.The data of PLC are handled and communication function also improves gradually.
Siemens S7-200 series of PLC is as important a member in the SIEMENS S7 series, little with its volume, software and hardware is powerful, and system configuration is convenient, advantage such as high reliability and high performance-price ratio makes it occupy sizable share at industrial control field, is used widely at industry-by-industry.
Dehumidifier is widely used in family, industry, people's air defense, national defence field, and the dehumidifier control system is also had higher requirement at aspects such as function, reliability, anti-interference, communications.Existing dehumidifier adopts unit control, adopts single-chip microcomputer to make master controller usually, and the reliability of system, anti-interference, man-machine interface (HMI) function, communication function are more weak, can not be integrated in the field bus control system easily.
Summary of the invention
The utility model the utility model is at the deficiency of the problems referred to above, provide a kind of utilization to adopt PLC to make controller, except common operation control, adopt text display to enrich dehumidifier local monitor function, employing expanding communication module expansion dehumidifier is remote, the remote monitoring function of many nodes, the treated circuit conversion of sensor signal becomes the usable frequency signal to insert the high-speed counting input of PLC, adopts timer counter to read humidity, temperature sensor information.
The technical solution of the utility model is:
A kind of dehumidifier control system based on PLC, the transmitter (2) that comprises Programmable Logic Controller PLC (1), constitutes by Temperature Humidity Sensor, fin temperature sensor and treatment circuit, the signal input part (3), contactor (4), the text display (5) and the expansion module of communicating by letter (6) that constitute by function button and fault-signal input.
The signal output part of described transmitter (2) is connected with the high-speed counting input (101) of Programmable Logic Controller PLC (1), each control signal output of signal input part (3) is connected with the digital input end (102) of Programmable Logic Controller PLC (1), the control signal input of contactor (4) is connected with the digital output end (103) of Programmable Logic Controller PLC (1), text display (5) is connected with Programmable Logic Controller PLC (1) by serial communication cable, and communication expansion module (6) is connected with Programmable Logic Controller PLC (1) by bus.
Programmable Logic Controller PLC (1) requires to give contactor (4) control signal corresponding according to the button of text display (5), the output signal of signal input part (3), host computer instruction, humidity value, fin temperature value and the control by communication expansion module (6) transmission; the compressor of control dehumidifier and the operation of blower fan, thus the dehumidifying, ventilation, shutdown and the defrost function that realize dehumidifier are controlled.
Described transmitter (2) converts the moisture signal of gathering to the usable frequency signal with temperature signal and is connected with the high-speed counting input (101) of Programmable Logic Controller PLC (1), Programmable Logic Controller PLC (1) thus timer counter obtains the sensor sample value.
Described text display (5) is the man-machine interface of dehumidifier control system, can realize the local Monitoring and Controlling of dehumidifier control system by serial communication cable, communication expansion module (6) can make things convenient for the dehumidifier control system to realize telecommunication by fieldbus and top level computer, and the dehumidifier control system can be by the remote computer Monitoring and Controlling as the intelligent node of fieldbus.
The beneficial effects of the utility model:
The utility model utilizes PLC to control dehumidifier as master control unit, utilizes the high-speed pulse counting of PLC to carry out data sampling, saves analog module, has saved cost; The application of text display makes local control and monitoring convenient flexibly; The expanding communication module has increased communication function, can carry out the remote monitoring of many dehumidifiers easily.The reliability of system, anti-interference, communication function, man-machine interface (HMI) function etc. have had large increase, have actual application value preferably.
Description of drawings
Fig. 1 is the block diagram of system of the present utility model.
Fig. 2 is " dehumidifying that heats up, automatic/standby " view.
Fig. 3 is a system wiring sketch of the present utility model.
Fig. 4 is a functional flow diagram of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Embodiment one:
The main electrical equipment of certain dehumidifier refrigeration system: 1 on compressor, 1.21kW, 5.6A, 1ph/50Hz/220VAC; 1 of blower fan, 50W, 0.7A, 1ph/50Hz/220VAC; Temperature Humidity Sensor and fin temperature sensor.Other has stop botton, start button, compressor operating indicator lamp, fan operation indicator lamp, compressor fault indicator lamp, fan operation malfunction indicator lamp etc.
Partial Variable is defined as follows: the Temperature Humidity Sensor symbol that is installed in air inlet is th, and its temperature that records is " EAT ", and symbol is t; Its humidity that records is " air intake humidity ", and symbol is h; The temperature sensor symbol that is installed in the evaporator fin is tc, and its temperature that records is " a fin temperature ", and symbol is tc.Air intake humidity set point symbol is: H, humidity difference set symbol number are: Δ H.
Dehumidifying: by " dehumidifying " key, blower fan gets electric, and the fan operation indicator lamp is bright, and system enters " dehumidifying that heats up, automatic/standby " state as shown in Figure 2: if h 〉=H+ Δ H delayed time 3 minutes, compressor gets electric, and the compressor operating indicator lamp is bright; As h≤H-Δ H, the compressor outage, the compressor operating indicator lamp goes out, and " automatic/standby " state is got back to by system.
Ventilate: by " ventilation " key, blower fan gets electric operation, and the fan operation indicator lamp is bright.
Shut down: by " shutdown " key, outages such as blower fan, compressor stop, and corresponding run indicator is gone out.
Unit adopts defrost control: under compressor got electricity condition, compressor moved more than 40 minutes continuously, during tc＜-4 ℃, entered the defrost program, that is: defrost run indicator is bright, the compressor outage, blower fan continue electric operation; Reach 8 minutes or during tc＞4 ℃, withdraw from the defrost program when the defrost time, the dehumidifying auto state is got back to by system.
Dehumidifier can unit operation, has the fault arbitration functions, can communicate with dehumidifier at the same level and top level computer.
The Hardware Design is as follows:
Fig. 1 is the block diagram of system of the present utility model.In Fig. 1, Programmable Logic Controller PLC adopts Siemens S7-200PLC, CPU 224CN AC/DC/RLY type; The communication expansion module adopts Siemens EM277 module, and its Profibus communication interface is connected with other dehumidifier or top level computer; Text display adopts Siemens TD400C type text display to carry out the setting of this machine, demonstration etc.Adopt following transmitter: 1 of humiture transmitter, measure intake air temperature and humidity, th, frequency signal output, 0～24VDC, temperature t :-10～50 ℃, 100～700Hz; Humidity h:10～100%, 100～1000Hz; 1 of temperature transmitter is measured the fin temperature, frequency signal output, 0～24VDC, temperature t c:-10～50 ℃, 100～700Hz; The break-make of compressor, blower fan adopts the output point of PLC to realize in conjunction with Schneider A.C. contactor (model is L1CD09, L1CD12).The system wiring sketch as shown in Figure 3, the I/O address of PLC distributes and to see Table 1.
Table 1 I/O address distributes
System controlling software is as follows:
Functional flow diagram as shown in Figure 4; adopt modularization programming; call each subprogram in the main program; an initialization subroutine is carried out in energising; scanning switch amount input then; carry out function and switch, call subprograms such as " dehumidifying ", " ventilation ", " defrost ", " shutdown ", " fault judgement ", " text display ", " communication " respectively.
In the data acquisition, three high-speed pulse input HSC0, HSC3, HSC4 three sensor/transmitter frequency signals being input to PLC respectively count, adopt T32 regularly 30s interrupt (interrupt event numbers 21, time base 1ms, maximum timing 32.767s), in the interrupt service subroutine counting is read and removed to three count values, restart counting.Because it is less demanding that native system is gathered signal real-time, and humidity sensor adopts condenser type, and is highly sensitive but to measure noise bigger, adopt the method for every 30s count signal frequency, can reduce to measure noise to a certain extent, reduce to measure quantization error, avoid high frequent to start.
Each function program requires to write according to control.Man-machine interface adopts the TD400C text display to carry out the local setting of dehumidifier, demonstration etc., can be used for stand-alone debugging and trouble shoot, and be divided into 3 functions: state shows, parameter is set and warning.Cooperation communication parter programs such as the amount of communication data that the communicator program can require according to whole monitoring system, traffic rate are write.
The utility model does not relate to the part prior art that maybe can adopt all same as the prior art to be realized.
Claims (3)
1. dehumidifier control system based on PLC, comprise Programmable Logic Controller PLC (1), by Temperature Humidity Sensor, the transmitter (2) that fin temperature sensor and treatment circuit constitute, the signal input part (3) that constitutes by the input of function button and fault-signal, contactor (4), text display (5) and the expansion module of communicating by letter (6), the signal output part that it is characterized in that described transmitter (2) is connected with the high-speed counting input (101) of Programmable Logic Controller PLC (1), each control signal output of signal input part (3) is connected with the digital input end (102) of Programmable Logic Controller PLC (1), the control signal input of contactor (4) is connected with the digital output end (103) of Programmable Logic Controller PLC (1), text display (5) is connected with Programmable Logic Controller PLC (1) by serial communication cable, and communication expansion module (6) is connected with Programmable Logic Controller PLC (1) by bus.Programmable Logic Controller PLC (1) requires to give contactor (4) control signal corresponding according to the button of text display (5), the output signal of signal input part (3), host computer instruction, humidity value, fin temperature value and the control by communication expansion module (6) transmission; the compressor of control dehumidifier and the operation of blower fan, thus the dehumidifying, ventilation, shutdown and the defrost function that realize dehumidifier are controlled.
2. the dehumidifier control system based on PLC according to claim 1, it is characterized in that, described transmitter (2) converts the moisture signal of gathering to the usable frequency signal with temperature signal and is connected with the high-speed counting input (101) of Programmable Logic Controller PLC (1), Programmable Logic Controller PLC (1) thus timer counter obtains the sensor sample value.
3. the dehumidifier control system based on PLC according to claim 1, it is characterized in that described text display (5) is the man-machine interface of dehumidifier control system, can realize the local Monitoring and Controlling of dehumidifier control system by serial communication cable, communication expansion module (6) can make things convenient for the dehumidifier control system to realize telecommunication by fieldbus and top level computer, and the dehumidifier control system can be by the remote computer Monitoring and Controlling as the intelligent node of fieldbus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920282941 CN201858740U (en) | 2009-12-22 | 2009-12-22 | Dehumidifier control system based on PLC (Programmable Logic Controller) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920282941 CN201858740U (en) | 2009-12-22 | 2009-12-22 | Dehumidifier control system based on PLC (Programmable Logic Controller) |
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| CN201858740U true CN201858740U (en) | 2011-06-08 |
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| CN 200920282941 Expired - Fee Related CN201858740U (en) | 2009-12-22 | 2009-12-22 | Dehumidifier control system based on PLC (Programmable Logic Controller) |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066339A (en) * | 2015-07-28 | 2015-11-18 | 广东美的暖通设备有限公司 | Control method and device for air-conditioner |
| CN106282518A (en) * | 2016-09-21 | 2017-01-04 | 北京科技大学 | Heater for rolling steel coal gas is carried out the Apparatus and method for of freezing dehumidification |
| CN109458709A (en) * | 2018-10-31 | 2019-03-12 | 壹格建筑科技(上海)有限公司 | A kind of air humidity adjusting device and control method |
| CN109458715A (en) * | 2018-10-31 | 2019-03-12 | 壹格建筑科技(上海)有限公司 | A kind of control method of air humidity adjusting device |
| CN110398023A (en) * | 2019-07-10 | 2019-11-01 | 杭州格米环境科技有限公司 | A kind of rotary wheel dehumidifying machine control system |
-
2009
- 2009-12-22 CN CN 200920282941 patent/CN201858740U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066339A (en) * | 2015-07-28 | 2015-11-18 | 广东美的暖通设备有限公司 | Control method and device for air-conditioner |
| CN105066339B (en) * | 2015-07-28 | 2018-04-03 | 广东美的暖通设备有限公司 | control method and device for air conditioner |
| CN106282518A (en) * | 2016-09-21 | 2017-01-04 | 北京科技大学 | Heater for rolling steel coal gas is carried out the Apparatus and method for of freezing dehumidification |
| CN109458709A (en) * | 2018-10-31 | 2019-03-12 | 壹格建筑科技(上海)有限公司 | A kind of air humidity adjusting device and control method |
| CN109458715A (en) * | 2018-10-31 | 2019-03-12 | 壹格建筑科技(上海)有限公司 | A kind of control method of air humidity adjusting device |
| CN109458709B (en) * | 2018-10-31 | 2020-11-03 | 壹格建筑科技(上海)有限公司 | Air humidity adjusting device and control method |
| CN110398023A (en) * | 2019-07-10 | 2019-11-01 | 杭州格米环境科技有限公司 | A kind of rotary wheel dehumidifying machine control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110608 Termination date: 20121222 |