CN103529883A - Programmable logic controller (PLC)-based temperature and liquid level combined monitoring system - Google Patents
Programmable logic controller (PLC)-based temperature and liquid level combined monitoring system Download PDFInfo
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- CN103529883A CN103529883A CN201310514409.0A CN201310514409A CN103529883A CN 103529883 A CN103529883 A CN 103529883A CN 201310514409 A CN201310514409 A CN 201310514409A CN 103529883 A CN103529883 A CN 103529883A
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Abstract
The invention provides a programmable logic controller (PLC)-based temperature and liquid level combined monitoring system. The PLC-based temperature and liquid level combined monitoring system comprises a digital switch of a mixing tank, an electric heater, a stirrer, an adjusting valve and a frequency converter, wherein the electric heater and the stirrer are arranged in the mixing tank; the adjusting valve and the frequency converter are used for controlling water intake of a positive displacement pump; a temperature transmitter and a liquid level transmitter are arranged in the mixing tank; the output ends of the temperature transmitter and the liquid level transmitter are connected with the input end of the PLC; the output end of the PLC is connected with the digital switch, the electric heater, the stirrer, the adjusting valve and the frequency converter respectively; the PLC is in interactive connection with an industrial personal computer. The PLC-based temperature and liquid level combined monitoring system combines temperature monitoring with liquid level monitoring to perform combined monitoring, acquires the liquid level and the temperature of water in the mixing tank in a real-time manner so as to adjust temperature and water intake and finally control start and stop of components, and has the advantages of reducing programs and improving efficiency.
Description
Technical field
The present invention relates to monitoring system, be specifically related to a kind of temperature and liquid level joint-monitoring system based on PLC.
Background technology
In industrialization processing process, inevitably to monitor the liquid level in the temperature of material, tank body.As needed to measure at any time the liquid level of water in blend tank in beverage processing process, compare with the level value of setting, then by the frequency of PID controller outputting analog signal Linear Control volumetric pump frequency converter, control the flow velocity that injects blend tank water, thereby accurately control the liquid level of water in blend tank.Need to measure in real time the water temperature in blend tank simultaneously, compare with the temperature value of setting, utilize temperature error values segmentation scales to control the start and stop of three electric heating tubes, water temperature in tank is controlled within the scope of the upper lower limit value of design temperature.When the liquid level in current measurement blend tank and temperature, be to measure respectively and control, operation more complicated, program is many, and treatment step is many.
Summary of the invention
The present invention is exactly, in order to overcome the above problems, to provide a kind of temperature and liquid level joint-monitoring system based on PLC, and the joint-monitoring of realization to temperature and liquid level simplified procedures, handled easily.
In order to achieve the above object, the invention provides a kind of temperature and liquid level joint-monitoring system based on PLC, comprise the digital switch of blend tank and be located at electric heater and the stirrer in blend tank, and variable valve and the frequency converter of controlling volumetric pump water inlet, in described blend tank, be provided with temperature transmitter and fluid level transmitter, described temperature transmitter is connected with the input end of PLC controller with the output terminal of fluid level transmitter, and the output terminal of described PLC controller is connected with described digital switch, electric heater, stirrer, variable valve and frequency converter respectively; PLC controller interactive mode is connected with industrial computer.
In order to realize joint-monitoring, described PLC controller interactive mode is connected with touch-screen.
Described PLC controller comprises CPU (central processing unit), and the input end of described CPU (central processing unit) is connected with respectively analog input module, digital input module; Its output terminal is connected with respectively analog output module, digital output module; Described analog input module is connected with fluid level transmitter with temperature transmitter respectively, and analog output module is connected with frequency converter with variable valve respectively; Described digital input module is connected with digital switch, and digital output module is connected with electric heater, stirrer respectively.
Native system monitoring temperature is joined together with liquid level monitoring together with joint-monitoring, simplify program, improved efficiency.PLC analog input module is connected with temperature transmitter with fluid level transmitter, fluid level transmitter and temperature transmitter provide the simulating signal of 4-20mA, and liquid level and the temperature of the interior water of Real-time Collection blend tank, PLC analog output module is connected with steam regulating valve, and the frequency of the frequency converter of the simulating signal control volumetric pump of output 4-20mA regulates the speed of water inlet.PLC digital input module linking number word switch, as debugging/automatic knob, water inlet/draining knob etc., gathers the signal of digital switch simultaneously; PLC numeral output module is connected with motorized valve, stirrer and electric heating tube, and output switching signal is controlled the start and stop of these executive components.
Liquid level and the temperature in blend tank can be monitored and record to system of the present invention in real time, controls this system manually with automated manner.Industrial computer in native system is Monitoring and Controlling flow process intuitively, shows instantaneous value and the trend curve of each parameter, and report output and data base querying etc. are monitored and centralized management function.
In addition, industrial computer and touch-screen can carry out joint-monitoring.In the situation that there is no industrial computer, touch-screen, as human-computer interaction interface and PLC forming control system reliability service independently still, completes parameter setting and the process control function of this system.
So this supervisory system can complete the data acquisition, animation demonstration, trend curve of liquid level and temperature, in real time and historical data is processed and the function such as report output printing, has realized real-time monitoring and the centralized management of liquid level and temperature.In the situation that there is no industrial computer, touch-screen can be used as human-computer interaction interface simultaneously, still can move reliably with PLC forming control system is independent, and blend tank ruuning situation is controlled in real time.Have stable and reliable for performance, install simply, and reduced financial cost, and improved the cost performance of system.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is theory diagram of the present invention.
In figure: 1-PLC controller, 1-1-CPU (central processing unit), 1-2-analog output module, 1-3-analog input module, 1-4-numeral output module, 1-5-digital input module, 2-industrial computer, 3-touch-screen, 4-variable valve, 5-frequency converter, 6-fluid level transmitter, 7-temperature transmitter, 8-stirrer, 9-electric heater, 10-digital switch.
Embodiment
As shown in Figure 1, a kind of temperature and liquid level joint-monitoring system based on PLC, comprise the digital switch 10 of blend tank and be located at the electric heater 9 and stirrer 8 in blend tank, and the variable valve 4 and frequency converter 5 of controlling volumetric pump water inlet, in described blend tank, be provided with temperature transmitter 7 and fluid level transmitter 6, described temperature transmitter 7 is connected with the input end of PLC controller 1 with the output terminal of fluid level transmitter 6, and the output terminal of described PLC controller 1 is connected with described digital switch 10, electric heater 9, stirrer 8, variable valve 4 and frequency converter 5 respectively; PLC controller 1 interactive mode is connected with industrial computer 2 and touch-screen 3.
Described PLC controller 1 comprises CPU (central processing unit) 1-1, and the input end of described CPU (central processing unit) 1-1 is connected with respectively analog input module 1-3, digital input module 1-5; Its output terminal is connected with respectively analog output module 1-2, digital output module 1-4; Described analog input module 1-3 is connected with fluid level transmitter 6 with temperature transmitter 7 respectively, and analog output module 1-2 is connected with frequency converter 5 with variable valve 4 respectively; Described digital input module 1-5 is connected with digital switch 10, and digital output module 1-4 is connected with electric heater 9, stirrer 8 respectively.
Native system monitoring temperature is joined together with liquid level monitoring together with joint-monitoring, simplify program, improved efficiency.PLC analog input module is connected with temperature transmitter with fluid level transmitter, fluid level transmitter and temperature transmitter provide the simulating signal of 4-20mA, and liquid level and the temperature of the interior water of Real-time Collection blend tank, PLC analog output module is connected with steam regulating valve, and the frequency of the frequency converter of the simulating signal control volumetric pump of output 4-20mA regulates the speed of water inlet.PLC digital input module linking number word switch, as debugging/automatic knob, water inlet/draining knob etc., gathers the signal of digital switch simultaneously; PLC numeral output module is connected with motorized valve, stirrer and electric heating tube, and output switching signal is controlled the start and stop of these executive components.
Above-described embodiment is not limited only to protection scope of the present invention, all based on basic thought of the present invention and all belonging in protection scope of the present invention of modifying or change.
Claims (3)
1. temperature and the liquid level joint-monitoring system based on PLC, comprise the digital switch of blend tank and be located at electric heater and the stirrer in blend tank, and variable valve and the frequency converter of controlling volumetric pump water inlet, it is characterized in that: in described blend tank, be provided with temperature transmitter and fluid level transmitter, described temperature transmitter is connected with the input end of PLC controller with the output terminal of fluid level transmitter, and the output terminal of described PLC controller is connected with described digital switch, electric heater, stirrer, variable valve and frequency converter respectively; PLC controller interactive mode is connected with industrial computer.
2. a kind of temperature and liquid level joint-monitoring system based on PLC according to claim 1, is characterized in that: described PLC controller interactive mode is connected with touch-screen.
3. a kind of temperature and liquid level joint-monitoring system based on PLC according to claim 1, it is characterized in that: described PLC controller comprises CPU (central processing unit), and the input end of described CPU (central processing unit) is connected with respectively analog input module, digital input module; Its output terminal is connected with respectively analog output module, digital output module; Described analog input module is connected with fluid level transmitter with temperature transmitter respectively, and analog output module is connected with frequency converter with variable valve respectively; Described digital input module is connected with digital switch, and digital output module is connected with electric heater, stirrer respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310514409.0A CN103529883A (en) | 2013-10-22 | 2013-10-22 | Programmable logic controller (PLC)-based temperature and liquid level combined monitoring system |
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| CN201310514409.0A CN103529883A (en) | 2013-10-22 | 2013-10-22 | Programmable logic controller (PLC)-based temperature and liquid level combined monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106406190A (en) * | 2016-12-05 | 2017-02-15 | 山东大学 | Liquid level and temperature monitoring system based on Delphi and ARM and working method thereof |
| CN113044413A (en) * | 2019-12-27 | 2021-06-29 | 中国石油天然气股份有限公司 | Oil storage tank heating system |
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| US7492233B2 (en) * | 2005-04-29 | 2009-02-17 | Honeywell International Inc. | Precision modulated controller output |
| CN201514564U (en) * | 2009-09-23 | 2010-06-23 | 伊玛精密电子（苏州）有限公司 | Flow calibration PLC automatic control system |
| CN202812387U (en) * | 2012-07-24 | 2013-03-20 | 柳州高新区欧亚自动化设备有限责任公司 | Constant pressure differential protecting control device for boiler water supply electric-control valve |
| CN103148608A (en) * | 2011-12-06 | 2013-06-12 | 陕西科林能源发展股份有限公司 | Solar energy and air energy complementary water heating control system |
| CN203588098U (en) * | 2013-10-22 | 2014-05-07 | 王绍禄 | System monitoring temperature and liquid level in united manner based on PLC |
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2013
- 2013-10-22 CN CN201310514409.0A patent/CN103529883A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7492233B2 (en) * | 2005-04-29 | 2009-02-17 | Honeywell International Inc. | Precision modulated controller output |
| CN201514564U (en) * | 2009-09-23 | 2010-06-23 | 伊玛精密电子（苏州）有限公司 | Flow calibration PLC automatic control system |
| CN103148608A (en) * | 2011-12-06 | 2013-06-12 | 陕西科林能源发展股份有限公司 | Solar energy and air energy complementary water heating control system |
| CN202812387U (en) * | 2012-07-24 | 2013-03-20 | 柳州高新区欧亚自动化设备有限责任公司 | Constant pressure differential protecting control device for boiler water supply electric-control valve |
| CN203588098U (en) * | 2013-10-22 | 2014-05-07 | 王绍禄 | System monitoring temperature and liquid level in united manner based on PLC |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106406190A (en) * | 2016-12-05 | 2017-02-15 | 山东大学 | Liquid level and temperature monitoring system based on Delphi and ARM and working method thereof |
| CN113044413A (en) * | 2019-12-27 | 2021-06-29 | 中国石油天然气股份有限公司 | Oil storage tank heating system |
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Application publication date: 20140122 |