CN103791925B - Reconfigurable temperature transmitter and reconfiguration method - Google Patents

Abstract

The invention provides a reconfigurable temperature transmitter and a reconfiguration method, wherein the transmitter includes a reference temperature sensing element for providing a reference signal; a detection interface module is connected with an external temperature sensing element and a reference temperature sensing element, It is used to detect the wiring mode of the external temperature sensing element, and perform AD conversion on the reference signal of the reference temperature sensing element and the measurement signal of the external temperature sensing element; the reconfigurable module is used to convert the reference signal and measurement signal after AD conversion respectively converted into reference values and measurement values; and a processing module, used to obtain the wiring mode of the external temperature sensing element detected by the detection interface module and determine the type of the external temperature sensing element according to the reference value and measurement value output by the reconfigurable module and for reconfiguring the temperature processing logic of the reconfigurable module according to the wiring mode and type of the external temperature sensing element, so that the reconfigurable module can process the signal measured by the external temperature sensing element, the embodiment of the present invention can improve Ease of use for temperature transmitters.

Description

Reconfigurable temperature transmitter and reconfiguration method

technical field

The invention relates to the field of industrial automation, in particular to a reconfigurable temperature transmitter and a reconfiguration method.

Background technique

In industrial processes, temperature transmitters are mainly used to measure the temperature of various gases, liquids or solids and to transmit the measured temperature signals over long distances. The traditional research on temperature transmitters mainly focuses on improving their measurement In terms of accuracy, the improvement of its usability is ignored, resulting in its very poor usability. This is specifically manifested in: when the temperature transmitter is connected to the temperature sensing element, it needs to perform "zero adjustment operation" and "adjustment range operation". Full-scale operation", it can only be installed on the application site and put into use after the commissioning is completed, and when selecting a temperature sensing element, only certain thermal resistors can be selected as its temperature sensing element for a certain temperature transmitter, which is a great limitation In addition, when performing calibration operations, it is necessary to repeat the cumbersome "zero-scale operation" and "full-scale operation", which seriously reduces the flexibility of the temperature transmitter. In addition, when selecting When the temperature sensing element changes, it is necessary to re-perform the "zero-scale operation" and "full-scale operation", and may even re-select another type of temperature transmitter. In addition, when replacing the old temperature transmitter with a new temperature transmitter When using a temperature transmitter, it is also necessary to perform "zero-scale operation" and "full-scale operation" again, which reduces the ease of use of the temperature transmitter.

Contents of the invention

In view of this, the present invention provides a reconfigurable temperature transmitter and a reconfiguration method, which can solve the problem of low usability of existing medium temperature transmitters.

The present invention provides a reconfigurable temperature transmitter, including:

A reference temperature sensing element is used to provide a reference signal;

The detection interface module is connected with the external temperature sensing element and the reference temperature sensing element, and is used for detecting the wiring mode of the external temperature sensing element, and simulating the reference signal of the reference temperature sensing element and the measurement signal of the external temperature sensing element Digital AD conversion;

A reconfigurable module, used to convert the reference signal and measurement signal after the AD conversion of the detection interface module into a reference value and a measurement value respectively;

and, a processing module, configured to acquire the wiring mode of the external temperature sensing element detected by the detection interface module, and determine the type of the external temperature sensing element according to the reference value and measurement value output by the reconfigurable module;

The processing module is further configured to reconfigure the temperature processing logic of the reconfigurable module according to the wiring mode and type of the external temperature sensing element, so that the reconfigurable module can process the external temperature sensing element The signal measured by the component.

Further, the detection interface module includes: an analog selection switch, a first AD conversion unit and a second AD conversion unit, the output of the reference temperature sensing element is connected to the input of the first AD conversion unit, and the first AD conversion unit The output of the conversion unit is connected to the reconfigurable module; the output of the external temperature sensing element is connected to the input of the analog selection switch, and the output of the analog selection switch is partially connected to the processing module and partially connected to the The input of the second AD conversion unit and the output of the second AD conversion unit are connected to the reconfigurable module.

Further, both the external temperature sensing element and the reference temperature sensing element are thermal resistors.

Further, the wiring mode of the external temperature sensing element includes: two-wire system, three-wire system or four-wire system.

Further, the reconfigurable module is a programmable device.

Further, the processing module is specifically used to judge whether a reconstruction scheme corresponding to the wiring mode and type is pre-stored locally according to the wiring mode and type of the external temperature sensing element, and if the corresponding reconstruction scheme is pre-stored locally, directly from the Reconfigure the reconfigurable module by extracting the reconfiguration scheme locally. If the corresponding reconfiguration scheme is not pre-stored locally, obtain the reconfiguration scheme from the remote to reconfigure the reconfigurable module or manually reconfigure the reconfigurable module. Do the refactoring.

The present invention also provides a reconfiguration method used in a reconfigurable temperature transmitter, including:

Identify the wiring method and type of the external temperature sensing element;

Obtain the corresponding reconstruction scheme according to the identified wiring mode and type;

According to the obtained reconfiguration solution, the temperature processing logic of the reconfigurable part is reconfigured, so that the reconfigurable part can process the signal measured by the external temperature sensing element.

Further, said obtaining a corresponding reconstruction scheme according to the identified wiring mode and type includes:

Judging whether there is a reconstruction scheme corresponding to the connection mode and type stored locally;

If the judgment result is yes, directly obtain the corresponding reconstruction scheme locally;

If the judgment result is no, the corresponding reconstruction solution is acquired through remote automatic or remote manual means.

Further, the wiring mode of the external temperature sensing element includes: two-wire system, three-wire system or four-wire system.

Further, the identification of the type of the external temperature sensing element includes:

Obtain the measurement signal output by the external temperature sensing element and the reference signal of the reference temperature sensing element;

converting said measurement signal and reference signal into a measurement value and a reference value, respectively;

The type of the externally connected temperature sensing element is determined according to the magnitude relationship between the measured value and the reference value.

Beneficial effects of the present invention:

In the embodiment of the present invention, aiming at the problem of low usability of the temperature transmitter in the prior art, by identifying the wiring mode and type of the external temperature sensing element, the weight corresponding to the wiring mode and type of the external temperature sensing element is adopted. The structural scheme reconstructs the temperature processing logic of the reconfigurable module so that it can process the temperature signal of the external temperature sensing element, thereby improving the usability of the temperature transmitter and enabling it to achieve "plug and play" without To remove the complicated "zero-scale operation" and "full-scale operation", that is, to introduce reconfigurable technology into the temperature transmitter to improve its usability.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Fig. 1 is a schematic structural diagram of an embodiment of a reconfigurable temperature transmitter provided by the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the detection interface module in Fig. 1 .

Figure 3-(a) to (c) is a schematic diagram of the wiring of the external temperature sensing element.

FIG. 4 is a schematic structural diagram of an embodiment of the processing module in FIG. 1 .

Figure 5 is a schematic diagram of an embodiment of an automaton planning sub-modules.

Fig. 6 is a schematic flowchart of an embodiment of a reconstruction method provided by the present invention.

detailed description

Please refer to Fig. 1, which is a schematic structural diagram of an embodiment of a reconfigurable temperature transmitter provided by the present invention, which includes: a reference temperature sensing element 1, a detection interface module 2, a reconfigurable module 3 and a processing module 4, wherein the reference The temperature sensing element 1 is connected to the detection interface module 2, and the detection interface module 2 is connected to the reconfigurable module 3 and the processing module 4 respectively, and the reconfigurable module 3 and the processing module 4 are also connected to each other, and the detection interface module 2 is also connected to the The external temperature sensing element is connected, and in this embodiment, the external temperature sensing element can be replaced.

Wherein, the reference temperature sensing element 1 is mainly used to provide a reference signal.

Among them, the detection interface module 2 is mainly used for detecting the wiring mode of the external temperature sensing element, and performing AD (analog to digital) conversion of the reference signal of the reference temperature sensing element and the measurement signal of the external temperature sensing element.

Specifically, as shown in FIG. 2 , in one embodiment, the detection interface module 2 includes: an analog selection switch 21, a first AD conversion unit 22 and a second AD conversion unit 23, wherein the output connection of the reference temperature sensing element 1 To the input of the first AD conversion unit 22, the output of the first AD conversion unit 22 is connected to the reconfigurable module 3; the output of the external temperature sensing element is connected to the input of the analog selection switch 21, and the output part of the analog selection switch 21 is directly connected To the AND processing module 4 , partly connected to the input of the second AD conversion unit 23 , and the output of the second AD conversion unit 23 is connected to the reconfigurable module 3 .

During work, by controlling the analog selector switch 21 to be disconnected from the second AD conversion unit 23 and closed with the processing module 4, the measurement of the wiring mode of the external temperature sensing element is realized, and by controlling the analog selector switch 21 to be disconnected from the processing module 4, and the The closing of the second AD conversion unit 23 realizes the analog-to-digital conversion of the measurement signal of the external temperature sensing element.

In this embodiment, the wiring mode of the external temperature sensing element can be selected as two-wire system, three-wire system or four-wire system. These three wiring modes are shown in Figure 3-(a), Figure 3-(b) and Figure 3- As shown in (c), in Figure 3-(a) to (c), the common terminal 3 is grounded, and terminals 1, 2, and 4 are connected to 10M pull-up resistors. By detecting the levels of terminals 1, 2, 3, and 4, That is, the detection of the connection mode of the temperature sensing element can be realized.

Among them, the reconfigurable module 3 is used to convert the reference signal (provided by the reference temperature sensing element) and the measurement signal (provided by the external temperature sensing element) after the AD conversion of the detection interface module 2 into a reference value and a measurement value respectively, Wherein the reference value and the measurement value may be resistance values.

Wherein, the reconfigurable module 3 may be realized by a programmable device, for example: FPGA (Field-Programmable Gate Array, Field Programmable Gate Array). Among them, the reconfigurable module 3 mainly performs signal processing. It obtains the AD-converted reference signal and measurement signal from the detection interface module 2, calculates the resistance value of the thermal resistance, and then sends it to the processor module 4, or it can also use binary search The table method converts the resistance value of the thermal resistance into a temperature value, and then sends the temperature value to the processor module 4 .

Among them, the processing module 4 is used to obtain the connection mode of the external temperature sensing element detected by the detection interface module 2, and determine the type of the external temperature sensing element according to the reference value and measurement value output by the reconfigurable module 3. Here, the reference value and the measured value may refer to the resistance value of the thermal resistance.

Among them, the processing module 4 is also used to reconfigure the temperature processing logic of the reconfigurable module 3 according to the connection mode and type of the external temperature sensing element, so that the reconfigurable module 3 can process the signal measured by the external temperature sensing element.

Specifically, the processing module 4 is used to determine whether a reconstruction scheme corresponding to the wiring mode and type is pre-stored locally according to the wiring mode and type of the external temperature sensing element. If the corresponding reconstruction scheme is pre-stored locally, the reconstruction scheme is directly extracted from the local Reconfigure the reconfigurable module according to the scheme. If the corresponding reconfiguration scheme is not pre-stored locally, obtain the reconfiguration scheme from the remote (remote communication can be realized by adding a communication interface) to reconfigure the reconfigurable module or use remote manual Refactor the reconfigurable module.

The following example illustrates the reconstruction process of the embodiment of the present invention.

In this embodiment, two refactorings are generally required, and each refactoring includes three stages: refactoring identification, refactoring planning, and refactoring deployment. Among them, the first reconstruction process is only determined by the connection mode of the external temperature-sensing element, and the reconstruction result can only calculate the resistance value of the thermal resistance. This process is a preparation for identifying the type of the temperature-sensing element. The second reconstruction process is determined by the connection mode and type of the external temperature sensing element. The reconstruction result can not only calculate the resistance value of the thermal resistance, but also perform temperature processing.

In this embodiment, two reconstructions can be realized by the aforementioned processing module 4. Specifically, as shown in FIG. Perform reconstruction identification, the planning sub-module 42 performs reconstruction planning, and the execution sub-module 43 performs reconstruction deployment.

Specifically, the convergence sub-module obtains the detection signal (the connection mode of the external temperature sensing element and the reference temperature of the reference temperature sensing element) from the reconfigurable module, and maps the connection mode (Connection Type, CT for short) to the reconstruction condition MCT, As shown in Table 1.

Table I

CT MCT Description BH MCT1 No RTD AH MCT2 2-wire RTD 8H MCT3 3-wire RTD 0H MCT4 4-wire RTD

Among them, the three thermal resistances used by the external temperature sensing element are represented as RTD1, RTD2, and RTD3. According to their temperature-resistance characteristics, the resistance values of thermal resistors at the same temperature are r ₁ , r ₂ , r ₃ respectively and r ₁ <r ₂ <r ₃ . The reference temperature sensing element is RTD2. Calculate its own resistance value from the reference temperature and compare it with the external temperature sensing element, then you can judge the type ST of the external temperature sensor. The rule is: when r _M <r _R -e, the type of the external temperature sensing element is RTD1; when r _R When -e<r _M <r _R +e, the type of external temperature sensing element is RTD2; when r _M >r _R +e, the type of external temperature sensing element is RTD3. Among them, r _M is the resistance value of the external thermal resistance, r _R is the resistance value of the reference thermal resistance, and e is the deviation value. Map ST to reconstruction condition MST, as shown in Table 2. MCT and MST are called aggregated data.

Table II

ST MST RTD1 MST2 RTD2 MST3 RTD3 MST4

Among them, the planning sub-module is based on automatic model formalization, which can perform conflict detection and reconstruction scheme planning of aggregated data.

When planning, the planning module needs to ensure that the system obeys the global constraint GC. Table 3 indicates the global constraints of the system. The table is defined as follows:

GC[n,k]=Modei(n,k),i(n,k)∈[1..M _i ],n∈[1..N],k∈[1..K]

Among them, Modei(n,k) is the reconstruction scheme that satisfies the constraints n and k, if Modei(n,k)=1 the reconstruction scheme exists, otherwise it does not exist, _Mi is the total number of reconstruction schemes, N is the external temperature The total number of element types, K is the total number of connection methods of external temperature sensing elements.

Table three

Wherein, the planning sub-module may be a 4-mode automaton, as shown in FIG. 5 , the planning sub-module starts in IDLE mode. In IDLE mode, the planning sub-module acquires and processes the aggregated data CD from the aggregation sub-module. Compare the current aggregation data with the reconstruction conditions that determine the last reconstruction, and if they are the same (RR=TRUE), then keep the IDLE mode. If different (RR=FALSE), enter TP1 mode. Once in this mode, the planning submodule checks whether the pooled data conflicts with the GC. If the reconstruction condition conflicts (CC=TRUE), it enters IDLE mode, and if there is no conflict (CC=FALSE), it enters TP2 mode. In this mode, the reconstruction scheme is queried according to the reconstruction condition. If the scheme does not exist (RS=FALSE ), then return to IDLE mode, if it exists (RS=TRUE), then enter TP3 mode, send the download reconstruction plan command to the reconstruction implementation sub-module, wait for the reconstruction of the reconstruction module to complete, and return the reconstruction completion information (RD=TRUE ), enter the IDLE mode, and enter the IDLE mode if no reconstruction completion message is received after waiting for a period of time (WT=TRUE).

In this embodiment, aiming at the problem of low usability of the temperature transmitter in the prior art, by identifying the wiring mode and type of the external temperature sensing element, the reconstruction corresponding to the wiring mode and type of the external temperature sensing element is adopted The scheme reconfigures the temperature processing logic of the reconfigurable module so that it can process the temperature signal of the external temperature sensing element, thereby improving the usability of the temperature transmitter and enabling it to achieve "plug and play", eliminating the need for Complicated "zero-scale operation" and "full-scale operation".

Next, the reconstruction method of the present invention will be described. It should be pointed out that many detailed steps in the method of the present invention have been introduced in the above examples, and only the main content will be described below.

Please refer to FIG. 6, which is a schematic flowchart of an embodiment of a reconfiguration method used in a reconfigurable temperature transmitter provided by the present invention, which includes:

Step S61, identifying the wiring mode and type of the externally connected temperature sensing element.

Wherein, identifying the type of the externally connected temperature sensing element in step S61 mainly includes: obtaining the measurement signal output by the externally connected temperature sensing element, and the reference signal of the reference temperature sensing element; converting the measurement signal and the reference signal into measured values respectively and the reference value; determine the type of the external temperature sensing element according to the relationship between the measured value and the reference value, specifically: when r _M <r _R -e, the type of the external temperature sensing element is RTD1; when r When _R -e<r _M <r _R +e, the type of external temperature sensing element is RTD2; when r _M >r _R +e, the type of external temperature sensing element is RTD3. Among them, r _M is the resistance value of the external thermal resistance, r _R is the resistance value of the reference thermal resistance, and e is the deviation value.

Step S62, obtaining a corresponding reconfiguration solution according to the identified connection mode and type.

Wherein, in step S62, obtaining the corresponding reconstruction scheme according to the identified wiring mode and type includes: judging whether a reconstruction scheme corresponding to the wiring mode and type is stored locally; if the judgment result is yes, directly obtaining the corresponding reconstruction scheme locally If the judgment result is no, then obtain the corresponding reconstruction plan by means of remote automatic or remote manual.

Step S63 , according to the acquired reconfiguration solution, reconfigure the temperature processing logic of the reconfigurable part, so that the reconfigurable part can process the signal measured by the external temperature sensing element.

In this embodiment, by identifying the wiring mode and type of the external temperature sensing element, the reconfiguration scheme corresponding to the wiring mode and type of the external temperature sensing element is adopted to reconfigure the temperature processing logic of the reconfigurable module, so that it It can process the temperature signal of the external temperature sensing element, thereby improving the ease of use of the temperature transmitter, enabling it to realize "plug and play", eliminating the complicated "zero-scale operation" and "full-scale operation".

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (9)

1. A reconfigurable temperature transmitter, characterized in that: comprising: A reference temperature sensing element is used to provide a reference signal; The detection interface module is connected with the external temperature sensing element and the reference temperature sensing element, and is used for detecting the wiring mode of the external temperature sensing element, and simulating the reference signal of the reference temperature sensing element and the measurement signal of the external temperature sensing element Digital AD conversion; The reconfigurable module is used to convert the reference signal and the measurement signal after the AD conversion of the detection interface module into a reference value and a measurement value respectively. The reconstruction includes two reconstructions, and each reconstruction includes 3 stages: Reconfiguration identification, reconstruction planning, and reconstruction deployment. The first reconstruction process is only determined by the connection mode of the external temperature sensing element, and the second reconstruction process is jointly determined by the connection mode and type of the external temperature sensing element; and, a processing module, configured to acquire the wiring mode of the external temperature sensing element detected by the detection interface module, and determine the type of the external temperature sensing element according to the reference value and measurement value output by the reconfigurable module; The processing module is further configured to reconfigure the temperature processing logic of the reconfigurable module according to the wiring mode and type of the external temperature sensing element, so that the reconfigurable module can process the external temperature sensing element Signals measured by components; The detection interface module includes: an analog selection switch, a first AD conversion unit and a second AD conversion unit, the output of the reference temperature sensing element is connected to the input of the first AD conversion unit, and the first AD conversion unit The output of the external temperature sensing element is connected to the input of the analog selection switch, and the output of the analog selection switch is partly connected to the processing module and partly connected to the The input of the second AD conversion unit, the output of the second AD conversion unit is connected to the reconfigurable module. 2. The reconfigurable temperature transmitter according to claim 1, wherein the external temperature sensing element and the reference temperature sensing element are thermal resistors. 3. The reconfigurable temperature transmitter according to claim 1, characterized in that: the wiring mode of the external temperature sensing element comprises: two-wire system, three-wire system or four-wire system. 4. The reconfigurable temperature transmitter according to claim 1, wherein the reconfigurable module is a programmable device. 5. The reconfigurable temperature transmitter according to any one of claims 1-4, characterized in that: the processing module is specifically used to determine whether the local For the reconstruction scheme corresponding to the connection mode and type, if the corresponding reconstruction scheme is pre-stored locally, then directly extract the reconstruction scheme from the local to reconstruct the reconfigurable module; if the corresponding reconstruction scheme is not pre-stored locally, then The reconfigurable module is reconfigured by obtaining the reconfiguration scheme remotely or by remote manual mode. 6. A reconfiguration method for a reconfigurable temperature transmitter, characterized in that: comprising: Identify the wiring method and type of the external temperature sensing element; Obtain the corresponding reconstruction scheme according to the identified wiring mode and type; According to the obtained reconfiguration plan, reconfigure the temperature processing logic of the reconfigurable part, so that the reconfigurable part can process the signal measured by the external temperature sensing element. The reconfiguration includes two reconfigurations, each reconfiguration Both include three stages: reconstruction identification, reconstruction planning, and reconstruction deployment. Among them, the first reconstruction process is only determined by the connection mode of the external temperature sensing element, and the second reconstruction process is determined by the connection mode of the external temperature sensing element. Mode and type are determined together. 7. The reconfiguration method according to claim 6, wherein said obtaining a corresponding reconfiguration solution according to the identified wiring mode and type comprises: Judging whether there is a reconstruction scheme corresponding to the connection mode and type stored locally; If the judgment result is yes, directly obtain the corresponding reconstruction scheme locally; If the judgment result is no, the corresponding reconstruction solution is acquired through remote automatic or remote manual means. 8. The reconfiguration method according to claim 6 or 7, characterized in that: the wiring mode of the external temperature sensing element includes: two-wire system, three-wire system or four-wire system. 9. The reconfiguration method according to claim 6 or 7, wherein the identification of the type of the external temperature sensing element comprises: Obtain the measurement signal output by the external temperature sensing element and the reference signal of the reference temperature sensing element; converting said measurement signal and reference signal into a measurement value and a reference value, respectively; The type of the externally connected temperature sensing element is determined according to the magnitude relationship between the measured value and the reference value.