CN105527995A - Remote temperature control system and using method thereof - Google Patents
Remote temperature control system and using method thereof Download PDFInfo
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- CN105527995A CN105527995A CN201410512369.0A CN201410512369A CN105527995A CN 105527995 A CN105527995 A CN 105527995A CN 201410512369 A CN201410512369 A CN 201410512369A CN 105527995 A CN105527995 A CN 105527995A
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Abstract
The invention provides a remote temperature control system and a using method thereof. The system comprises a computer, a PLC, an A/D conversion module, a transmitter, a thermocouple, a voltage regulator and a heater, wherein the PLC, the A/D conversion module, the transmitter, the thermocouple, the heater and the voltage regulator are sequentially connected; and the PLC and the computer are in two-way connection. The system and the method have the advantages that the control system comprises the PLC and thus a program is convenient to rewrite, different production needs can be met, and particular system parameters or part devices can be regulated according to different requirements of each industry.
Description
Technical field
What the present invention relates to is remote monitor supervision area, specifically relates to a kind of Remote temperature control system and using method thereof.
Background technology
Many fields all need the monitoring to temperature, as plantation and the storage, laboratory etc. of the production equipment of factory, chemical field, Aero-Space, crops.Have the temperature in a lot of field may be higher or lower, people cannot near or scene monitor without the need to manpower, we can use remote monitoring, are sitting in office and just can monitor scene, facilitate not only but also saving manpower.
Current temperature controller principle is: the industrial heating furnace temperature control system usually controlled by position formula or time scale formula humidostat, because can not rapid reaction when its major loop be controlled by contactor, so temperature-controlled precision is all lower, mostly the several years even more than tens degree; Along with the development of Power Electronic Technique and components and parts, there is the scheme of following several solution:
1, major loop contactless controllable silicon and solid-state relay replaces contactor, the temperature control system that the adjusting apparatus being equipped with PID or fuzzy logic control is formed, its temperature-controlled precision improves greatly, be everlasting ± 2 DEG C within, advantage adopts fuzzy control to control to combine with PID, wide to range of control, to respond soon and continuously adjustabe system has huge superiority.
2, Single chip microcomputer temperature control system is adopted.By 1-wire digital temperature sensor collecting temperature data, break collecting temperature changed again by traditional thermal resistance, thermopair thinking by A/D.With single-chip microcomputer numeral processed and control, passing to PC by RS-232 serial ports and carry out monitoring to temperature and report to the police, the upper and lower bound of set temperature.Its advantage is that structure is simple, and programming does not need with special programmable device, only need click computer mouse and just the program finished can be write in single-chip microcomputer, and very convenient and debugging, amendment and upgrading are easy to.
3, ARM (AdvancedRISCMachine) embedded system Fuzzy temperature control.Utilize the power of arm processor, by reading temperature sensor data, and compare with setting value, then temperature is controlled.Obtain fabulous real-time by embedded operating system uCLintix, and by ICP/IP protocol can be very fast with PC communication.Just temperature control precision is not high for its advantage, and can carry out setup control temperature by scene with long-range two kinds of modes.
These three kinds of temperature control systems have respective deficiency respectively, and the first dirigibility is not enough, cumbersome to the change of whole line system when production technology is improved or adjust time, even need again winding displacement to set up a system, gigantic project.
Single chip microcomputer temperature control system extendability when multimetering is strong, and reliability is low, is subject to external interference, simultaneously to high more than the not enough cost of development of the transmission of 100 meters of distances, controls response frequently as unfavorable in well heater etc. to system miscellaneous part.
The embedded temperature control system of ARM is higher to software requirement, is combined closely with network technology, is applicable to Long-distance Control, but exploitation is complicated, and requires very high to engineering staff.
Along with the development of electronic technology, programmable controller (PLC) is controlled by original simple amount of logic, is progressively provided with the function of computer control system.In modern industry controls, PLC has occupied very consequence, and it can the control system of composition control perfect in shape and function together with computing machine.In the industrial control system of many industries, it is all one of problem that will solve that temperature controls.As plastic extruder mostly Bian simple temperature control instrument and temperature control circuit control, there is the shortcomings such as control accuracy is low, overshoot is large, be difficult to produce high-quality plastic products.Similar problem is all there is at some heat treatment industries.For this reason, design comparatively general temperature control system significant, concrete systematic parameter or part of devices can adjust according to the requirement difference of every profession and trade.
Summary of the invention
For the defect of prior art, the invention provides a kind of Remote temperature control system and using method thereof, is a kind of comparatively general temperature control system, and its concrete systematic parameter or part of devices can adjust according to the requirement difference of every profession and trade.
Above-mentioned purpose of the present invention is realized by the feature of independent claims, and dependent claims develops the feature of independent claims with alternative or favourable mode.
Technical scheme of the present invention is: a kind of Remote temperature control system, comprising:
Computing machine, for the host computer of industrial controlling;
PLC, possesses the industry spot machine of certain logical operation capability with communication capacity, keeps communicating and carry out logic control by the program set with host computer;
A/D modular converter, carries out the assembly of analog quantity digital quantity conversion, and continuous print analog quantity is converted to the discrete digital quantity that computing machine can process;
Transmitter, converts the resistance of thermopair to the magnitude of current of 4 ~ 20mA of standard or the voltage of 0 ~ 10V;
Thermopair, utilizes the metal temperature sensors such as the platinum of temperature resistance good linearity;
Voltage adjuster, changes the height of output voltage according to the change of input signal;
Well heater, changes the intensity of heating according to the height of input voltage;
Wherein, PLC, A/D modular converter, transmitter, thermopair, well heater are connected successively with voltage adjuster, and PLC is connected with computer bidirectional.
Further, described PLC adopts the Programmable Logic Controller of the CPM2AH type of Omron Corp's production;
Further, described PLC comprises CPU element and expanding element; Expanding element adopt in I/O unit, analog quantity I/O unit and CompoBus/SI/O link unit one or more.
Further, the CPU element of described PLC comprises I/o memory module, program module, PC arrange module and communication switch module.
The using method of above-mentioned Remote temperature control system, comprises the following steps:
1) according to the process analysis control overflow produced; As needed sequence of movement, operation condition, necessary protection and chain etc., mode of operation as manually, automatically, continuously, the monocycle, the process conditions such as single step determination;
2) required user's input-output device is determined according to control overflow; Selected PLC, determines counting of PLC, distributes the I/O point of PLC, design I/O connection layout; Counter, timer etc. that system is used are distributed;
3) program design of PLC is carried out; For the control system of complexity, need drawing system control flow chart, in order to clearly illustrate that order and the condition of action, ladder diagram be designed;
4) to program inventory according to ladder diagram, with programmable device, program is typed in the user memory of PLC, and check the program correctness keyed in;
5) whether whether scrutiny program can correctly completion logic requirement, can complete very well.If nonconforming, program debugged and revises, until meet the demands;
6) save routine.
From the above technical solution of the present invention shows that, the present invention is compared with traditional system, and it has following advantage and useful effect:
1, many fields all need the monitoring to temperature, as plantation and the storage, laboratory etc. of the production equipment of factory, chemical field, Aero-Space, crops.Have the temperature in a lot of field may be higher or lower, people cannot near or scene monitor without the need to manpower, we can utilize Remote temperature control system of the present invention, are sitting in office and just can monitor scene, facilitate, safety and saving manpower;
2, the general Remote temperature control system that proposes of the present invention, an advantage of Programmable Logic Controller be exactly the program wherein of can rewriting very easily to meet different technique, especially when process modification, advantage is more obvious.The control system be made up of PLC can rewrite program easily, and to adapt to different need of productions, concrete systematic parameter or part of devices can adjust according to the requirement difference of every profession and trade.
Accompanying drawing explanation
Fig. 1 is the inner structure schematic diagram of embodiments of the invention Remote temperature control system;
Fig. 2 is the inner structure schematic diagram of the CPU element of embodiment of the present invention PLC.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further:
As Fig. 1 shows, preferred embodiment of the present invention, this Remote temperature control system comprises: computing machine 1, PLC 2, A/D modular converter 3, transmitter 4, thermopair 5, well heater 6 and voltage adjuster 7; Wherein, PLC 2, A/D modular converter 3, transmitter 4, thermopair 5, well heater 6 are connected successively with voltage adjuster 7, and PLC 2 and computing machine 1 are bi-directionally connected.
Its principle of work is:
1, temperature data acquisition; Carry out with the A/D expansion module MAD01 of PLC, in thermal module, measure the temperature linearity voltage of an output 0 ~ 10V, by arranging the expansion A/D module of PLC, this voltage is become digital quantity, program loop, ground read these digital quantities, and by these read numbers, compare with setting value.
2, the Programmable Logic Controller of CPM2AH type produced with Omron Corp of data processing section; The work of primary responsibility data processing and storage; By making software, to Bian collection to temperature signal and setting value compare process, on line operation is carried out to relevant operational signal.
When forming a control system by PLC and controlled device, usually carry out with several step below:
1, according to the process analysis control overflow produced.As the action (sequence of movement, operation condition, necessary protection and chain etc.) needed, mode of operation (manually, automatically, continuously, monocycle, single step etc.
2, required user's input-output device is determined according to control overflow.Selected PLC; Determine counting of PLC; Distribute the I/O point of PLC, design 170 connection layout.In addition, system is used counter, timer etc. also will distribute.
3, the program design of PLC is carried out.For the control system of complexity, need drawing system control flow chart, in order to clearly illustrate that order and the condition of action, for simple control system, also can omit.Design ladder diagram, this is a crucial step.
4, to program inventory according to ladder diagram, with programmable device, program is typed in the user memory of PLC, and check the program correctness keyed in.
Whether 5, whether scrutiny program can correctly completion logic requirement, can complete very well.If nonconforming, program debugged and revises, until meet the demands.
6, save routine.
As shown in Figure 2, following structure composition is mainly comprised in the CPU element of P PLC of the present invention:
1, I/o storer; The data of program when performing in this memory area of read/write; I/o storer contains the position of reflection PC input/output state, and I/O storer is eliminated when power supply electrifying, and other parts are retained.
2, program module; Program is write by user, and CPM2A circulation performs this program.Program can rough segmentation be two parts: circulate " master routine " that perform and " interrupt routine " that only have the just execution when corresponding interruption generates.
3, PC arranges module; PC arranges and comprises various startup and operating parameter.Parameters can only be changed by programming device, does not change by program.Some parameter only has when PC power source powers on just accessed, and other parameters are then accessed termly after the power-up.The parameter just accessed when PC power source powers on is only had for those, must could set new argument after power-off re-powers again.
4, communication switch module; Communication switch determination peripheral port RS-232C port is by standard traffic setting or the operation of the communication setting in arranging by PC.
The CPU element mode of operation of PLC has following three kinds of modes of operation:
1, PROGRAM mode; Under programming mode, program can not perform.Which carries out performing the operation of preparing for program below: rewrite as PC arranges those interior initially/operating parameters; Write, transmission and scrutiny program; Set and forced resetting is forced to check wiring with I/O position.
2, MONITOR mode; Program performs and can carry out following operation by programming device under MONITOR mode: online editing; I/O storer during supervisory work; Force set/forced resetting, change settings, change currency during operation.In general, MONITOR mode is used for program debug, detects operation and adjusts.
3, RUN mode; Under RUN mode, program performs with normal speed.As online editing, I/O forces set/forced resetting, and changing the operations such as settings/currency can not carry out under RUN mode, but can carry out I/O position status surveillance.
In sum, the control system that system of the present invention is made up of PLC can rewrite program easily, and to adapt to different need of productions, concrete systematic parameter or part of devices can adjust according to the requirement difference of every profession and trade.
In addition, time as controlled temperature range, fuzzy control popular at present, feedforward control can be adopted, in the temperature range of setting, by absorbing factory's experience, set up suitable model, make in advance and control reflection, while ensureing control accuracy, economize energy, reduce Instrumentation Motion, increase instrument serviceable life.After believing modes such as adding fuzzy control, such Universal Remote temperature control system has stronger vitality, also can obtain more practice and development chance.
Above instructions word and accompanying drawing are only explanation of the invention and explanation, in any form the present invention be not construed as limiting and limit, scope of the present invention is as the criterion with claims, and all do not exceed the apparent amendment of present inventive concept, conversion and replacement scheme all within the scope of the present invention.
Claims (5)
1. a Remote temperature control system, is characterized in that comprising:
Computing machine, for the host computer of industrial controlling;
PLC, possesses the industry spot machine of certain logical operation capability with communication capacity, keeps communicating and carry out logic control by the program set with host computer;
A/D modular converter, carries out the assembly of analog quantity digital quantity conversion, and continuous print analog quantity is converted to the discrete digital quantity that computing machine can process;
Transmitter, converts the resistance of thermopair to the magnitude of current of 4 ~ 20mA of standard or the voltage of 0 ~ 10V;
Thermopair, utilizes the metal temperature sensors such as the platinum of temperature resistance good linearity;
Voltage adjuster, changes the height of output voltage according to the change of input signal;
Well heater, changes the intensity of heating according to the height of input voltage;
PLC wherein, A/D modular converter, transmitter, thermopair, well heater are connected successively with voltage adjuster, and PLC is connected with computer bidirectional.
2. Remote temperature control system according to claim 1, is characterized in that, the Programmable Logic Controller of the CPM2AH type that described PLC adopts Omron Corp to produce.
3. Remote temperature control system according to claim 1, is characterized in that, described PLC comprises CPU element and expanding element; Expanding element adopt in I/O unit, analog quantity I/O unit and CompoBus/SI/O link unit one or more.
4. Remote temperature control system according to claim 1, is characterized in that, the CPU element of described PLC comprises I/o memory module, program module, PC arrange module and communication switch module.
5., according to the using method of Remote temperature control system according to claim 1, it is characterized in that comprising the following steps:
1) according to the process analysis control overflow produced; As needed sequence of movement, operation condition, necessary protection and chain etc., mode of operation as manually, automatically, continuously, the monocycle, the process conditions such as single step determination;
2) required user's input-output device is determined according to control overflow; Selected PLC, determines counting of PLC, distributes the I/O point of PLC, design I/O connection layout; Counter, timer etc. that system is used are distributed;
3) program design of PLC is carried out; For the control system of complexity, need drawing system control flow chart, in order to clearly illustrate that order and the condition of action, ladder diagram be designed;
4) to program inventory according to ladder diagram, with programmable device, program is typed in the user memory of PLC, and check the program correctness keyed in;
5) whether whether scrutiny program can correctly completion logic requirement, can complete very well.If nonconforming, program debugged and revises, until meet the demands;
6) save routine.
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| CN201410512369.0A CN105527995A (en) | 2014-09-29 | 2014-09-29 | Remote temperature control system and using method thereof |
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| CN201410512369.0A CN105527995A (en) | 2014-09-29 | 2014-09-29 | Remote temperature control system and using method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106125785A (en) * | 2016-08-30 | 2016-11-16 | 安庆三维电器有限公司 | A kind of electric control circuit based on PLC |
| CN109374145A (en) * | 2018-10-12 | 2019-02-22 | 健研检测集团有限公司 | The method for determining component continuous temperature field based on discrete temperature measuring point |
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| CN1354539A (en) * | 2001-11-21 | 2002-06-19 | 杨积元 | Intelligent remote monitoring system of transformer of distribution system |
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