CN105892394B - Band redundant digit temperature sensor bus control unit for refrigeration system - Google Patents
Band redundant digit temperature sensor bus control unit for refrigeration system Download PDFInfo
- Publication number
- CN105892394B CN105892394B CN201610380871.XA CN201610380871A CN105892394B CN 105892394 B CN105892394 B CN 105892394B CN 201610380871 A CN201610380871 A CN 201610380871A CN 105892394 B CN105892394 B CN 105892394B
- Authority
- CN
- China
- Prior art keywords
- temperature sensor
- communication
- communication interface
- bus
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 23
- 230000006854 communication Effects 0.000 claims abstract description 107
- 238000004891 communication Methods 0.000 claims abstract description 105
- 238000001514 detection method Methods 0.000 claims description 13
- 230000006870 function Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000012549 training Methods 0.000 claims description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention relates to a kind of bus control unit, and in particular to the temperature sensor bus control unit applied to lithium bromide chiller system controller.It is proposed a kind of band redundant digit temperature sensor bus control unit for refrigeration system, including multigroup communication interface and one group of difference RS485 interface and microcontroller；Multigroup communication interface independently uses or sets redundancy to use, every group of communication interface connects multiple digital temperature sensors by bus, temperature data in digital temperature sensor is read and stored into the memory of microcontroller by communication interface, when redundancy uses, at least one set of communication interface is as spare interface, difference RS485 interfaces are connected with the RS485 interfaces of the PLC programmable controller in refrigeration system, for the temperature data in memory to be transmitted in PLC programmable controller, microcontroller built-in controller software.The present invention realizes communication of the refrigeration system programmable controller over long distances with digital sensor, reduces cost and optimizes the complexity of whole system.
Description
Technical field：
The present invention relates to a kind of bus control unit, and in particular to the temperature sensing applied to lithium bromide chiller system controller
Device bus control unit.
Background technology：
Air-conditioning system often uses component of the analog sensor as measurement temperature, however analog sensor usually using into
This higher noble metal, such as platinum are used as the core component of sensor, and analog sensor output is several millivolts of voltage
Signal, is required for high-precision AD devices to gather these signals, and AD devices currently on the market only have 2 tunnels, 4 tunnels or 8 tunnels, and
In work condition environment, 4 road AD ports can only be integrated by generally limiting each AD devices；And digital sensor cost is extremely low, and make
It is convenient to be connected up during, and small, digital sensor can provide 9-12 temperature measuring datas, and built-in programmable is non-volatile
Memory, temperature are converted directly into 16 system numbers and are stored in nonvolatile memory, can reduce the data in transmitting procedure and be subject to
Error caused by interference between actual value and measured value, but digital sensor works long hours in severe industrial environment
Can be poor, communication distance is short there are stability the problem of.
Digital sensor cost is low, which solves the shortcomings that digital sensor communication distance is short.In particular freeze
The functions such as the redundancy that system specially designs, slew-rate control, substantially increase the stability of digital sensor.It is digital sensor energy
Long-time stable works in severe industrial environment.Save the higher analog sensor of cost and high-precision AD device.Save
Production cost, brings the benefit of higher to enterprise.
The content of the invention：
For solve problems of the prior art, the present invention propose for refrigeration system specially design with the total of redundancy
Lane controller, substantially increases the stability of digital sensor, solves the shortcomings that digital sensor communication distance is short, can make number
Word sensor long-time stable can work in severe industrial environment, save the higher analog sensor of cost and high-precision AD
Device.Production cost has been saved, the benefit of higher is brought to enterprise.
To achieve the above object, the technical solution adopted by the present invention is：It is proposed a kind of band redundant digit for refrigeration system
Word temperature sensor bus control unit, including multigroup communication interface and one group of difference RS485 interface and microcontroller；
Multigroup communication interface independently uses or sets redundancy to use, and every group of communication interface is connected multiple by bus
Temperature data in digital temperature sensor is read and stored to the memory of microcontroller by digital temperature sensor, communication interface
In, redundancy is in use, at least one set of communication interface as spare interface, when mistake occurs in any one group of communication interface, and passes through
When attempting still recover several times, spare interface works on instead of wrong interface automatically；
The difference RS485 interfaces are connected with the RS485 interfaces of the PLC programmable controller in refrigeration system, for inciting somebody to action
Temperature data in memory is transmitted in PLC programmable controller；
The microcontroller built-in controller software.
The communication interface has three groups, and every group of communication interface connects 0-120 digital temperature sensor by bus.
The controller software includes following functions module：
1）Fault detection module：Short circuit or the open circuit fault of communication interface are detected, which is carried out continuously failure inspection three times
Survey, effective temperature data is not read after detecting three times, then record failure and close corresponding communication interface；
2）Redundancy detection module：According to the testing result of fault detection module, the module automatic identification routing path, control
When device is redundant configuration, automatically configures other spare communication interfaces and work on；
3）Communication quality detection module：When communication interface does not break down, which has detected whether digital temperature sensing
Device exists, and it is then effective port to have communication interface existing for digital temperature sensor, then all digital temperatures of the block search
Sensor, and check sensor data, and according to the life cycle of check results calculating digital temperature sensor, life cycle
It is the numerical value of 8 systems, it is higher to be worth bigger communication quality, when equal to 0, shows that sensor thoroughly disappears, if more than 0,
Then prove that sensor exists, if equal to 255, proves sensor communication fault-free；
4）Bus voltage monitoring module：Due to the resistance characteristic and capacitive characteristics of conducting wire, letter during long distance transmission
Number rising edge and trailing edge can all be slowed down；The module inspects communication interface bus voltage, and bus voltage reaches high level voltage
When to bus " charging ", bus is reached supply voltage as early as possible, improve bus communication speed and communication quality.
Modbus communications protocol is used between the difference RS485 interfaces and PLC programmable controller.
The priority level that the Modbus communications protocol reads digital temperature sensor than microcontroller is low, and microcontroller reads number
During word temperature sensor, in the Modbus communication functions for the place shielding for needing to strictly observe sequential, that is, shield Modbus and interrupt,
Recover Modbus in 30us to receive or send to interrupt, ensure that the success rate for reading digital sensor, Modbus state wheels
Instruction mechanism uses time interrupt processing mechanism, break period 1ms.
The communication succession of the Modbus communications protocol extends 12% than the communication succession of standard Modbus communications protocol.
Isolated from power and signal isolation circuit are provided with the difference RS485 interface circuits.
Bus control unit of the present invention is provided with three groups of communication interfaces and one group of RS485 interface, and 3 groups of communication interfaces can configure
To be independently operated, or mutual redundancy.When there is mistake in any one group interface, and by attempting still recover several times
When, which is closed, other interfaces are connected to the port of error, and controller works on.Difference RS485 interfaces with
Other interfaces are electrically completely isolated, it is possible to reduce the interference in industrial environment or other adverse circumstances.Communication distance is most
Greatly 1km, and built-in esd protection circuit.Difference RS485 interfaces are communicated with the PLC programmable controller in refrigeration system, PLC
Read the numerical value for each digital temperature sensor being connected with communication interface.Present invention employs fine impedance matching and intelligence
The methods of software control, slew rate control, ensures that the network can realize the communication distance of 300m on common RVVP conducting wires.
The present invention realizes refrigeration system and may be programmed by designing a band redundancy feature digital temperature sensor controller
Communication of the controller over long distances with digital sensor, reduces the cost of temperature in use sensor and optimizes whole system
Complexity, further simplifies the processes such as sensor installation, wiring, control, coordinates upper programmable logic controller (PLC), realize
To the function of each position temperature acquisition of refrigeration machine.
Brief description of the drawings
Fig. 1 is the temperature acquisition system schematic diagram of the prior art；
Fig. 2 is the temperature acquisition system schematic diagram of the present invention；
Fig. 3 is the bus connection diagram of the present invention；
Fig. 4 is trailing edge signal waveform of the conducting wire in 300m remote locations；
Fig. 5 is the trailing edge signal waveform that remote signaling reflexes to drive circuit；
Fig. 6 be it is optimized after communication signal waveform；
Fig. 7 is closely wire laying mode schematic diagram；
Fig. 8 is connected mode schematic diagram hand in hand；
Fig. 9 is star-like connection schematic diagram；
Figure 10 is long range wire laying mode schematic diagram；
Figure 11 is the power unit connection diagram of the present invention；
Figure 12 is the digital temperature acquisition interface circuit figure of the present invention.
Embodiment
The present invention is described in further detail with reference to specific embodiment, but the invention is not limited in specific implementation
Example.
Temperature acquisition gathers refrigeration system mostly using the acquisition system such as Fig. 1 using analog sensor in refrigeration system
In temperature signal, the output signal of analog sensor is delivered to maincenter after high-precision AD acquisition modules carry out data conversion
PLC intelligent programmable controllers in., can generation with a temperature controller after Fig. 2 temperature controllers using the present invention
For multiple high-precision AD devices, former analog sensor is replaced with DS18B20 digital sensors.Gathered and freezed by digital sensor
In cold warm water inlet temperature, cold warm water outlet temperature, cooling water inlet temperature, cooling water outlet temperature, cooling water in system
Between the temperature such as temperature, water heater inlet temperature, water heater outlet temperature, low-temperature regenerator temperature, refrigerant temperature；Temperature controller
After receiving the digital signal that digital sensor DS18B20 is gathered and exported, pass through the electronic circuit hardware inside temperature controller
Microcontroller is transmitted a signal to after processing, received data processing is docked by software program in microcontroller；The letter handled
Number RS485 signal outputs are converted into maincenter PLC programmable controller by RS485 conversion chips, are used for control system.
Originally each analog sensor is necessarily connected to AD devices, goes out a bus, Suo Youchuan out of Electric Appliance Cabinet now
Sensor is connected in this root bus.Bus includes bus cable and line concentration circuit board, and digital sensor wire end is direct
It is plugged on line concentration circuit board, each line concentration circuit board is connected on digital sensor bus control unit using bus cable.PLC
Programmable logic controller (PLC) is instructed using Modbus and reads temperature data from digital temperature sensor controller.
Band redundant digit temperature sensor bus control unit for refrigeration system as shown in Figure 3, including three groups of communications
Interface and one group of difference RS485 interface and microcontroller；P, N pin connection probe power of every group of communication interface, DT pins connect
Connect sensor communication port, PE pin connecting wire shielded layers.Three groups of communication interfaces independently use or set redundancy to use, often
Group connects multiple digital temperature sensors by bus, and the temperature data in digital temperature sensor is read and deposited by communication interface
Storage is independent in use, three groups of communication interfaces can connect three independent large-scale temperature sensor networks into the memory of microcontroller；
When redundancy uses such as Fig. 3, one group of communication interface connect multiple digital temperature sensors by bus, other two groups of communication interfaces are made
For spare interface, when mistake occurs in communication interface, microcontroller and by when attempting still recover several times is spare to connect
Mouth works on instead of wrong interface automatically.
Difference RS485 interfaces and RS485 the interface ends 485A and 485B of the PLC programmable controller in refrigeration system connect
Connect, for the temperature data in memory to be transmitted in PLC programmable controller.Electricity is provided with difference RS485 interface circuits
Source isolates and signal isolation circuit, and 485 interfaces of isolation have stronger antijamming capability, and the DC/DC power supplys isolated allow
485 interfaces are connected in the system of different DC power supply power supply controls.The system uses Modbus rtu protocols on 485 interfaces
By data acquisition into programmable logic controller (PLC).
Modbus rtu protocols are complete Modbus agreements, and international standard is met in sequential, and are digital sensor
Communications protocol specially optimize.Controller software is by inside data acquisition to memory.Memory field is divided into IO inputs, and IO is exported,
Register inputs, the region such as register output.Modbus reads the data of relevant range according to command content automatically.It can also read
Take controller correlation behavior.Complete Modbus can be that the product of any support Modbus agreements is linked in the network.Should
The core of Modbus is the state machine of Modbus.Modbus controls what is next according to the state of agreement.Such as when
Modbus is in initialization, then then switches to and receives state；If receive state, then still receive state in next step；
If receive completion status, then be verification in next step, read memory, transmission state etc..When receiving data,
Modbus receives data with interrupt mode, a timer is set after receiving data every time, when the time receives character for 3.5 times
Between.With 9600bps, N, 8, exemplified by 1, each character 11, includes start bit 1,8 data, stop element 1, check bit 0
Position.The time of one character is 9600 x of 1000ms ÷, 11 3.5=4.01ms of x.When not received within the time
Data, timer overflow, then it is assumed that a data is received to finish.By interrupt mode than wheel seek in a manner of more reduce at processor
Manage the time.Since digital sensor communications protocol needs the high timing control of precision, a general Modbus agreement cannot
Meet the requirement of the controller.For class such as in Modbus communication process, receiving data sending data is automatically performed with interrupting
, but interrupting execution needs the time, this time can influence to read the effect of digital sensor.Communication is caused to malfunction.The control
If device processed employs drying method and solves Communication.Main method is the Modbus softwares for making controller than reading digital sensing
The priority of device is low, but keeps its real-time again.When controller reads digital sensor, when some need to strictly observe
The Modbus interface communication functions of the place shielding of sequence, i.e. shielding are interrupted, and must be recovered Modbus in 30us and be received or send
Interrupt.It ensure that the success rate for reading digital sensor.Modbus state machine trainings in rotation mechanism is also changed to time interruption from host process
Processing, break period 1ms.So that the implementation procedure of Modbus and the implementation procedure of reading sensor are will not in IO controls
Mutually it is interrupted, is worked at the same time again in whole control process.
The bus protocol of bus temperature controller is that the long range that is exclusively used in changed on the bus protocol of standard passes
The agreement of transmission of data.During long distance transmission, since conducting wire is there are impedance, signal is in distal end meeting distortion over long distances, such as Fig. 4
It is shown.As communication distance is elongated, wave distortion degree will become larger.When distance exceedes to a certain degree, distal sensor will not
It can detect the signal that controller is sent.Communication succession is extended, is about extended than standard agreement by many experiments by the present invention
12%, so that communication distance obtains the improvement of a more step；Improve the driving force of IO in hardware circuit using MOSFET, use is general
Communication distance can be brought up to 300m by logical shielded wire；Remote signaling not only influences digital sensor, also influences controller,
If Fig. 5 is that remote signaling reflexes to the oscillogram of director port in trailing edge.Therefore in whole communication cycle, controller
Waveform will strictly be controlled, such as in pull-up, bus voltage is promoted to power supply by controller output high level as early as possible
Voltage etc..
The microcontroller built-in controller software of bus temperature controller, controller software mainly include following functions module：
1）Fault detection module：Short circuit or the open circuit fault of communication interface are detected, which is carried out continuously failure inspection three times
Survey, effective temperature data is not read after detecting three times, then record failure and close corresponding communication interface；
2）Redundancy detection module：According to the testing result of fault detection module, the module automatic identification routing path, control
When device is redundant configuration, automatically configures other spare communication interfaces and work on；
3）Communication quality detection module：When communication interface is in short circuit for a long time, port would be possible to be burned out.Built-in
The fuse of the port is blown, and port is changed into open circuit；When short circuit does not occur, which detects whether with the presence of sensor,
If it does, port is then effective status, next controller search all the sensors, and the data of check sensor,
And the state of port is predicted according to check results.School.It is due to that network is excessive if check value and check results are all zero,
Communications failure.If verification error, then caused by being probably surge.In this case, controller will be retried 3 times until by institute
There is sensing data to read out in memory, and calculate the communication quality parameter that its life cycle provides sensor for host computer,
Life cycle is the numerical value of 8 systems, and value is bigger, and communication quality is higher, when equal to 0, shows that sensor thoroughly disappears,
If more than 0, then prove that sensor exists, if equal to 255, proves sensor communication fault-free；
4）Bus voltage monitoring module：Due to the resistance characteristic and capacitive characteristics of conducting wire, letter during long distance transmission
Number rising edge and trailing edge can all be slowed down；The module inspects communication interface bus voltage, and bus voltage reaches high level voltage
When to bus " charging ", bus is reached supply voltage as early as possible, improve bus communication speed and communication quality, communication signal is through excellent
After change, the waveform that bus is " charged up " is as shown in Figure 6.
Digital temperature sensor bus control unit passes each temperature after all digital temperature sensor data are read
The data of sensor are placed in memory headroom according to specified order.Modbus agreements are read after some specific region of memory
Data are to represent the sensor temperature of some specific location.When sensor is not present, i.e. temperature sensor is pulled out or temperature
In the case of sensor degradation, upper PLC programmable logic controller (PLC)s can according to controller calculate sensor lifecycles come
Sensor is deleted in control alarm from system.
Digital temperature sensor bus control unit and the wire laying mode of each digital temperature sensor can be selected flexibly, see figure
7-10.Fig. 7, Fig. 8, Fig. 9 are generally more convenient when closely, and in remote or Figure 10 when needing redundancy connection mode
Performance is better.Fig. 7 illustrates a kind of closely connection mode, and controller is with digital sensor apart from close, communication performance
It is best.Fig. 8 illustrates a kind of connection mode of handing in hand, and controller connects a connection and is directly connected to digital sensor, passes
A sensor piece connection of parallel connection is connected to other sensors, and such connection mode reflected energy is minimum.Fig. 9 shows a kind of star
Shape connection mode.In actual use, often star-like connection mode more uses, but also with connection, then star hand in hand
Shape connects.When beyond network radius, the internetwork connection mode of Figure 10 must be just used.Figure 10 is by a large-scale network point
Solve as several small-sized networks, raising communication performance.This controller provides the communication interface of three tunnels striking resemblances, it may be connected to
Three independent catenets, or redundancy link is into one or two sensor networks.
Digital temperature sensor has wider supply voltage supply district, and has extremely low power consumption.Digital temperature passes
Sensor bus control unit may be coupled directly to the power supply output of PLC programmable logic controller (PLC)s, as shown in figure 11, can save one
Switching Power Supply, still ensures that its 485 power supply is isolated with all system power supplies, strong antijamming capability.
OW bus ports, in order to the steady operation in industrial environment, are divided into 4 parts and according to lithium bromide by bus
The characteristics of system single optimization.When bus output is high level, high level, such as Figure 12 are driven using P-MOS：R1,
C1, Q1 form high level output circuit, and Q1 is P-MOS, and the effect of C1 is to protect Q1 from electrostatic breakdown, the effect of R1 and R3
It is the input terminal electric current for limiting P-MOS.The communication distance of OW buses is largely related with the driving force of interface.Raising connects
The driving force of mouth, can improve wiring distance；Bus output for it is low level when, similar to high level output circuit,
Low level, R2, C2, Q2, R4 composition low level output circuit are driven using N-MOS；Posted when digital temperature sensor works in
During raw power supply powering mode, digital sensor does not have single power supply to power, and controller is directly to bus " charging ", by R7, C4,
Q3 forms " charging " circuit, similar with high level output circuit, but eliminates the current-limiting resistance of output.Do not wish under normal circumstances
Hope digital sensor be operated in and posts power mode, be operated in and post power mode and mean that sensor is not connected to power supply, electric power disconnection,
But in the network less than 100m, it is more convenient using power mode is posted.Any moment, low and high level output and " charging " circuit
There can only be a circuit job；When bus is in the state read, using resistance R4, the network of R5 and capacitance C3 compositions provides
Draw, and processing is filtered to signal.It is desirable that pull-up resistor is the bigger the better in communication process, bus voltage can be faster
Be increased to supply voltage, resistance R5 resistance values are 920R, plus R4 current-limiting resistances, form the pull-up resistor net of an equivalent 1K
Network.The too small low level voltage that bus can be caused the to export rise of resistance value.Interface parallel connection Schottky diode D1, D2, Schottky
Diode D1, D2 are respectively turned on to power supply and ground, the interference on limiting circuitry, including ESD impact and the coupling of neighbouring conductor signal.
The effect of resistance R6 is limitation ESD electric currents, and protection controller internal circuit is from ESD damage.When current-limiting resistance and Schottky two
When pole pipe all fails, interface fuse F1 is blown, and software can find interface open circuit in communication, then can configure other interfaces company
The interface is connected to attempt to work on.So as to fulfill OW bus interface from hardware and software whole redundancy feature.
Claims (7)
1. the band redundant digit temperature sensor bus control unit for refrigeration system, it is characterised in that：Connect including multigroup communication
Mouth and one group of difference RS485 interface and microcontroller；
Multigroup communication interface independently uses or sets redundancy to use, and every group of communication interface connects multiple numerals by bus
Temperature sensor, the temperature data in digital temperature sensor is read and stored into the memory of microcontroller by communication interface, superfluous
It is remaining in use, at least one set of communication interface is as spare interface, when there is mistake in any one group of communication interface, and by some
When secondary trial can not still recover, spare interface works on instead of wrong interface automatically；
The difference RS485 interfaces are connected with the RS485 interfaces of the PLC programmable controller in refrigeration system, for by memory
In temperature data be transmitted in PLC programmable controller；
The microcontroller built-in controller software.
2. the band redundant digit temperature sensor bus control unit according to claim 1 for refrigeration system, its feature
It is：The communication interface has three groups, and every group of communication interface connects 0-120 digital temperature sensor by bus.
3. the band redundant digit temperature sensor bus control unit according to claim 1 for refrigeration system, its feature
It is：The controller software includes following functions module：
1）Fault detection module：Short circuit or the open circuit fault of communication interface are detected, which is carried out continuously fault detect three times, and three
Effective temperature data is not read after secondary detection, then records failure and closes corresponding communication interface；
2）Redundancy detection module：It is according to the testing result of fault detection module, the module automatic identification routing path, controller
During redundant configuration, automatically configure other spare communication interfaces and work on；
3）Communication quality detection module：When communication interface does not break down, which has detected whether that digital temperature sensor is deposited
It is then effective port to have communication interface existing for digital temperature sensor, then all digital temperatures of block search sensing
Device, and check sensor data, and according to the life cycle of check results calculating digital temperature sensor, life cycle is one
The numerical value of a 8 system, value is bigger, and communication quality is higher, when equal to 0, shows that sensor thoroughly disappears, if more than 0, then demonstrate,proves
Bright sensor exists, if equal to 255, proves sensor communication fault-free；
4）Bus voltage monitoring module：Due to the resistance characteristic and capacitive characteristics of conducting wire during long distance transmission, on signal
Rise edge and trailing edge can all be slowed down；The module inspects communication interface bus voltage, when bus voltage reaches high level voltage to
Bus " charging ", makes bus reach supply voltage as early as possible, improves bus communication speed and communication quality.
4. the band redundant digit temperature sensor bus control unit according to claim 1 for refrigeration system, its feature
It is：Modbus communications protocol is used between the difference RS485 interfaces and PLC programmable controller.
5. the band redundant digit temperature sensor bus control unit according to claim 4 for refrigeration system, its feature
It is：The priority level that the Modbus communications protocol reads digital temperature sensor than microcontroller is low, and microcontroller reads numeral
During temperature sensor, needing the place for strictly observing sequential to shield Modbus communication functions, that is, shielding Modbus and interrupt,
Recover Modbus in 30us to receive or send to interrupt, ensure that the success rate for reading digital sensor, Modbus state machine trainings in rotation
Mechanism uses time interrupt processing mechanism, break period 1ms.
6. the band redundant digit temperature sensor bus control unit according to claim 4 for refrigeration system, its feature
It is：The communication succession of the Modbus communications protocol extends 12% than the communication succession of standard Modbus communications protocol.
7. according to any band redundant digit temperature sensor bus control units for refrigeration system of claim 1-6,
It is characterized in that：Isolated from power and signal isolation circuit are provided with the difference RS485 interface circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610380871.XA CN105892394B (en) | 2016-06-01 | 2016-06-01 | Band redundant digit temperature sensor bus control unit for refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610380871.XA CN105892394B (en) | 2016-06-01 | 2016-06-01 | Band redundant digit temperature sensor bus control unit for refrigeration system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105892394A CN105892394A (en) | 2016-08-24 |
| CN105892394B true CN105892394B (en) | 2018-05-15 |
Family
ID=56709138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610380871.XA Expired - Fee Related CN105892394B (en) | 2016-06-01 | 2016-06-01 | Band redundant digit temperature sensor bus control unit for refrigeration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105892394B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201900004235A1 (en) * | 2019-03-25 | 2020-09-25 | Centerfrigo S R L | AUTOMATIC MANAGEMENT AND MONITORING SYSTEM OF REFRIGERATED ZONES |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748014B (en) * | 2017-11-22 | 2024-05-21 | 中国科学技术大学 | System for reading multipath temperature sensor |
| CN110162430B (en) * | 2018-02-13 | 2021-11-09 | 华为技术有限公司 | Temperature self-adaption method, device and equipment |
| CN111380629A (en) * | 2020-03-30 | 2020-07-07 | 珠海格力电器股份有限公司 | Temperature detection device, air conditioner and temperature detection method of air conditioner |
| CN114326366B (en) * | 2021-12-02 | 2023-09-12 | 珠海格力电器股份有限公司 | Soft redundancy control system and configuration method thereof |
| CN115328001A (en) * | 2022-09-20 | 2022-11-11 | 昆山斯沃普智能装备有限公司 | Equipment signal acquisition device and method for cooling system of new energy automobile battery replacement station |
| CN219103473U (en) * | 2022-12-15 | 2023-05-30 | 合肥华凌股份有限公司 | Data acquisition system and refrigeration equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929328A (en) * | 2014-03-21 | 2014-07-16 | 广西师范大学 | Automatic diagnosis and redundancy protection method and device of broken link of monobus temperature measurement control system |
| CN104154663A (en) * | 2014-08-27 | 2014-11-19 | 成都前锋电子有限责任公司 | Temperature sensor active redundancy method and system based on constant temperature gas water heater |
| CN105202835A (en) * | 2010-06-09 | 2015-12-30 | 赛默飞世尔科技(阿什维尔)有限责任公司 | Refrigeration system management and information display |
-
2016
- 2016-06-01 CN CN201610380871.XA patent/CN105892394B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105202835A (en) * | 2010-06-09 | 2015-12-30 | 赛默飞世尔科技(阿什维尔)有限责任公司 | Refrigeration system management and information display |
| CN103929328A (en) * | 2014-03-21 | 2014-07-16 | 广西师范大学 | Automatic diagnosis and redundancy protection method and device of broken link of monobus temperature measurement control system |
| CN104154663A (en) * | 2014-08-27 | 2014-11-19 | 成都前锋电子有限责任公司 | Temperature sensor active redundancy method and system based on constant temperature gas water heater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201900004235A1 (en) * | 2019-03-25 | 2020-09-25 | Centerfrigo S R L | AUTOMATIC MANAGEMENT AND MONITORING SYSTEM OF REFRIGERATED ZONES |
| WO2020194183A1 (en) * | 2019-03-25 | 2020-10-01 | Centerfrigo S.R.L. | Automatic managing and monitoring system of predetermined refrigerated zones of a refrigeration plant |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105892394A (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105892394B (en) | Band redundant digit temperature sensor bus control unit for refrigeration system | |
| CN103645730B (en) | A kind of motion control card with self-checking function and detection method | |
| CN101937222A (en) | Board level testing system | |
| CN106776428A (en) | Terminal device, read-write device, data transmission system and hardware initialization method | |
| CN103605017A (en) | Detection method of vehicle switch quantity signal | |
| CN104459386B (en) | A kind of USB data line tester | |
| CN104635102A (en) | Electronic component detection device and detection method thereof | |
| CN107895943B (en) | Device and its control method with wiring protection function | |
| CN103941619A (en) | Reconfigurable microcomputer protection development platform based on FPGA | |
| CN203933666U (en) | A kind of CAN bus repeater | |
| CN103701095A (en) | Test equipment protection circuit | |
| CN104422897A (en) | Method and device for detecting direct current crossing in double direct-current power source systems | |
| CN202033441U (en) | State detection device for valve chest of high-current rectifier | |
| CN101764403B (en) | UUT protective circuit | |
| CN207852281U (en) | LED display modules and LED display | |
| CN207219048U (en) | SIM card batch detecting device | |
| CN206004293U (en) | IGBT (insulated Gate Bipolar transistor) under-voltage protection circuit and induction cooker | |
| CN106502911A (en) | Multiple terminals access device | |
| CN208110686U (en) | Data processing equipment | |
| CN207148593U (en) | Controller between Intelligent sanitary | |
| CN214540463U (en) | Relay board for switching and detecting multiple paths of signals | |
| CN109739673A (en) | A kind of register write protection method, logic device and communication equipment | |
| CN107728507A (en) | Controller and control system between Intelligent sanitary | |
| CN209118114U (en) | Portable type recorder | |
| CN201278464Y (en) | Optical fiber current differential protection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180515 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |