CN110519255B

CN110519255B - HART communication circuit and safety control system

Info

Publication number: CN110519255B
Application number: CN201910773735.0A
Authority: CN
Inventors: 陆卫军; 金福坤; 柏立悦; 张晓刚
Original assignee: Zhejiang Supcon Technology Co Ltd
Current assignee: Zhejiang Supcon Technology Co Ltd
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2021-08-20
Anticipated expiration: 2039-08-21
Also published as: CN110519255A

Abstract

The application relates to an addressable remote transducer Highway Addressable Remote Transducer (HART) communication circuit, the circuit includes: the HART communication module and the at least two paths of data acquisition circuits; wherein: the HART communication module comprises a HART MODEM MODEM and a processor CPU; each data acquisition circuit comprises a CPU; the HART MODEM of the HART communication module is connected with the CPU of the HART communication module; and the CPU of the HART communication module is respectively connected with the CPU of each data acquisition circuit and is used for acquiring the data acquired by each data acquisition circuit and determining a target data acquisition circuit according to the data. By implementing the method and the device, the complexity of the circuit can be reduced, and the complex cooperation of multiple HART MODEMs in a multiple redundant circuit during HART communication is avoided.

Description

HART communication circuit and safety control system

Technical Field

The application relates to the field of HART communication, in particular to a HART communication circuit and a safety control system.

Background

The Highway Addressable Remote Transducer (HART) protocol is a transition technology that occurs during the transition from analog instruments to fieldbus systems, and has a certain vitality for a certain period of time. At present, HART protocol products are widely used in the field of automation control.

In a safety control system, after an Input-Output (IO) card at a front end collects signals, the front end signals are converted into Digital signals through an Analog-Digital (AD) converter and an HART module and transmitted to an upper layer. In the process of signal transmission, the safety and reliability of data transmission need to be ensured through a multi-path redundancy mode, therefore, each redundant circuit needs to be configured with one HART MODEM (MODEM), the whole circuit is complex, and a plurality of HART MODEMs in the redundant circuit need to cooperate with each other to finally output an analog signal.

Disclosure of Invention

The embodiment of the application provides a HART communication circuit, can reduce the complexity of circuit, has avoided the complicated cooperation of a plurality of HART MODEMs when carrying out HART communication among the multiple redundant circuit.

In a first aspect, an embodiment of the present application provides a Highway Addressable Remote Transducer (HART) communication circuit, where the HART communication circuit includes a HART communication module and at least two data acquisition circuits; wherein: the HART communication module comprises a HART MODEM MODEM and a processor CPU; each data acquisition circuit comprises a CPU; the HART MODEM of the HART communication module is connected with the CPU of the HART communication module; and the CPU of the HART communication module is respectively connected with the CPU of each data acquisition circuit and is used for acquiring data acquired by each data acquisition circuit and determining a target data acquisition circuit according to the data.

By implementing the embodiment of the application, the HART MODEM can be independently packaged with a CPU as an unsafe circuit, is independent of a multiple redundant data acquisition circuit, is isolated from the data acquisition circuit, and cannot interfere with each other. When HART communication is executed, complex cooperation is not needed, HART communication between the equipment management software and the front-end instrument is realized through interaction between the CPU of the HART communication module and the CPU of the data acquisition circuit, and the whole circuit structure is simple.

In one possible implementation, the HART communication circuit comprises a two-way data acquisition circuit or a three-way data acquisition circuit.

In another possible implementation manner, each of the data acquisition circuits further includes an input/output IO module, and the IO module is configured to perform analog-to-digital AD conversion or digital-to-analog DA conversion on data.

In another possible implementation manner, the IO module is connected to a CPU of the data acquisition circuit.

In another possible implementation, the determining a target data acquisition circuit according to the data includes: judging whether a data acquisition circuit corresponding to the data is in fault according to the data; and selecting a target data acquisition circuit from the data acquisition circuits except the failed data acquisition circuit in the at least two data acquisition circuits.

In a second aspect, an embodiment of the present application provides a safety control system, including: the system comprises a first device, an addressable remote sensor Highway Addressable Remote Transducer (HART) communication circuit, a controller, a communication module and a second device; wherein: the HART communication circuit comprises a HART communication module and at least two data acquisition circuits; wherein: the HART communication module comprises a HART MODEM MODEM and a processor CPU; each data acquisition circuit comprises a CPU; the HART MODEM of the HART communication module is connected with the CPU of the HART communication module; the CPU of the HART communication module is respectively connected with the CPU of each data acquisition circuit and is used for acquiring data acquired by each data acquisition circuit and determining a target data acquisition circuit according to the data; the first device is connected with the HART communication circuit and used for outputting analog data; the controller is connected with the HART communication circuit and is used for processing data output by the HART communication circuit; the communication module is connected with the controller and used for transmitting data output by the controller; the second device is connected with the communication module and used for receiving the data output by the communication module.

In another possible implementation, the determining a target data acquisition circuit according to the data includes: judging whether a data acquisition circuit corresponding to the data is in fault according to the data;

and selecting a target data acquisition circuit from the data acquisition circuits except the failed data acquisition circuit in the at least two data acquisition circuits.

In a third aspect, an embodiment of the present application provides a highway addressable remote transducer HART communication method, which is applied to a HART communication circuit provided in the first aspect or any implementation manner of the first aspect of the present application; the method comprises the following steps:

the at least two paths of data acquisition circuits acquire data output by the first equipment;

the at least two paths of data acquisition circuits send the data to the HART communication module;

the HART communication module determines a target data acquisition circuit according to the data;

the HART communication module modulates and demodulates the data;

and sending the modulated and demodulated data to second equipment by adopting the target data acquisition circuit.

In one possible implementation, the determining, by the HART communication module, a target data acquisition circuit from the data includes: judging whether a data acquisition circuit corresponding to the data is in fault according to the data;

In a fourth aspect, embodiments of the present application provide another addressable remote sensor highway HART communication device, which may include a memory, a processor; wherein:

the memory is used for storing a computer program;

the processor is configured to invoke the computer program to cause the HART communication device to execute the HART communication method provided in the third aspect or any implementation manner of the third aspect of the embodiment of the present application.

In a fifth aspect, embodiments of the present application provide a computer program product, which, when run on a Highway Addressable Remote Transducer (HART) communication device, causes the HART communication device to perform the HART communication method provided in any one of the third or fourth aspects of the embodiments of the present application.

In a sixth aspect, embodiments of the present application provide a computer-readable storage medium comprising instructions that, when executed on a Highway Addressable Remote Transducer (HART) communication device, cause the HART communication device to perform the HART communication method provided in any implementation of the third or fourth aspect of embodiments of the present application.

Drawings

Fig. 1 is a schematic diagram of a HART communication circuit in a dual redundant safety control system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a HART communication circuit in a multiple redundancy safety control system according to an embodiment of the present application;

fig. 3 is a schematic diagram of a HART communication circuit in another multiple redundant safety control system according to an embodiment of the present application;

fig. 4 is a structural diagram of a safety control system according to an embodiment of the present application;

fig. 5 is a structural diagram of another safety control system provided in an embodiment of the present application;

fig. 6 is a flow chart of a HART communication method according to another embodiment of the present application;

fig. 7 is a schematic diagram of a HART communication device according to an embodiment of the present application;

fig. 8 is a schematic diagram of another HART communication device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The HART communication circuitry provided by embodiments of the present application may be used, but is not limited to, for instrument management. The meter may be, for example but not limited to, a pressure transmitter, a temperature transmitter, a flow meter, an actuator, etc. The instrument can send the parameter of the instrument to the management device through the HART communication circuit, and the management device can also send the instruction for adjusting the parameter to the instrument through the HART communication circuit. The user can carry out the work such as configuration, debugging, demarcation, diagnosis to the instrument in process of production.

Fig. 1 shows a HART communication circuit diagram in a dual redundant safety control system.

As shown in fig. 1, the HART communication circuit diagram in the dual redundant safety control system may include two data acquisition circuits, and when one circuit fails, the other circuit may be used to transmit signals to the upper layer devices. Therefore, the accuracy of the signal collected by the front section can be ensured.

Meanwhile, in a redundant circuit, namely in two paths of data acquisition circuits, the field instrument can be configured, debugged, calibrated, diagnosed and the like through one HART MODEM respectively. The redundant circuit is switched to the other data acquisition circuit when one data acquisition circuit fails through mutual cooperation between the CPUs, so that the overall safety and reliability of the system are ensured.

For a system with a higher security level, dual redundancy cannot meet the requirement, and a redundant circuit with multiple layers needs to be provided. Referring to fig. 2 and 3, a HART communication circuit according to an embodiment of the present application will be described by way of comparison with triple redundancy.

Fig. 2 shows a HART communication circuit diagram in a triple redundant safety control system.

As shown in fig. 2, a three-way data acquisition circuit may be included in the HART communication circuit diagram of the triple redundant safety control system. And each data acquisition circuit needs to be separately configured with HART MODEM. Because each HART only supports the control of one master device and one hand-shaking device, when the circuit needs HART communication, the CPUs of a plurality of redundant data acquisition circuits are needed to perform complex mutual cooperation, and after the final HART communication route is determined, the equipment management software of the terminal performs the operations of configuration, debugging, calibration, diagnosis and the like on the field instrument.

In order to reduce the complexity of the HART communication circuit in the safety control system and reduce the complex mutual cooperation between the CPUs of the respective redundant data acquisition circuits, the embodiment of the present application provides a HART communication circuit applied to a dual redundant safety control system or a multiple redundant safety control system. The following embodiments will be described taking a triple redundant safety control system as an example.

Fig. 3 illustrates a HART communication circuit diagram in a triple redundant safety control system provided by an embodiment of the present application.

As shown in fig. 3, the HART communication circuit in the triple-redundant safety control system provided by the embodiment of the present application may include: HART communication module and three routes data acquisition circuit. Wherein:

the HART communication module may include a HART MODEM and a CPU.

Each path of data acquisition circuit comprises an IO card and a CPU respectively.

The CPU of the HART communication module is respectively connected with the CPU of each data acquisition circuit and is used for acquiring data acquired by each data acquisition circuit (namely IO card), and determining a target data acquisition circuit according to the data, wherein the target data acquisition circuit is a final HART communication route.

Specifically, the CPU of the HART communication module may obtain the data acquired by each data acquisition circuit through the CPU of the data acquisition circuit, compare the data acquired by each data acquisition circuit, remove the faulty data acquisition circuit, and select the target data acquisition circuit from the remaining data acquisition circuits, which is the final HART communication route.

The HART MODEM is used to modulate and demodulate the data collected by the data collection circuit.

The IO card of the data acquisition circuit may include an analog input AI, an analog output AO, a digital input DI, and a digital output DO. The IO card can convert digital signals into analog signals, namely DA conversion, and can also convert the analog signals into digital signals, namely AD conversion.

The embodiment of the application provides a safety control system. As shown in fig. 4, the safety control system may include: a first device 410, a HART communication circuit 420, a controller 430, a communication module 440, and a second device 450. Wherein:

in one implementation, the first device 410 may be, for example, but not limited to, a meter for outputting an analog signal, such as may be a measurement of the meter, etc. The analog signals mentioned in the embodiments of the present application may be analog data mentioned in the foregoing embodiments.

The HART communication circuit 420 is coupled to the first device 410 for receiving the analog signal from the first device 410, processing the analog signal, and outputting a digital signal. The digital signals mentioned in the embodiments of the present application may be digital data mentioned in the foregoing embodiments.

Controller 430 is coupled to HART communication circuitry 420 for processing the digital signals output by the HART communication circuitry.

The communication module 440 is connected to the controller 430 for transmitting the digital signal output from the controller.

The second device 450 is connected to the communication module 440 for receiving the digital signal output by the communication module. The second device 450 may be, for example, a terminal device on which software for controlling the first device 410 may be installed.

In another implementation, the second device 450 may be, for example and without limitation, a terminal device, on which software for controlling the first device 410 may be installed, and the second device 450 may be configured to output a digital signal for controlling the first device 410 to switch an operating parameter.

The communication module 440 is connected to the second device 450, and is configured to transmit the digital signal output by the second device 450.

The controller 430 is connected to the communication module 440 for processing the digital signals transmitted by the communication module 440.

HART communication circuit 420 is coupled to controller 430 and configured to receive the digital signal from controller 430, process the digital signal, and output an analog signal.

The first device 410 is coupled to the HART communication circuit 420 and is configured to receive the analog signal from the HART communication circuit 420 and adjust an operating parameter based on the analog signal.

The HART communication circuit mentioned in the above two implementations may include one HART communication module and a plurality of data acquisition circuits, and fig. 4 illustrates three data acquisition circuits as an example.

As shown in fig. 4, a first device may be connected to each data acquisition circuit via a HART communication module. The HART communication module is respectively connected with each data acquisition circuit and used for judging whether the data acquisition circuit has a fault or not and determining a final HART communication line.

The embodiment of the application also provides another safety control system. As shown in fig. 5, the safety control system may include: a first device 510, a HART communication circuit 520, a controller 530, a communication module 540, and a second device 550. Wherein:

the functionality of the first device 510 is identical to the functionality of the first device 410 provided in fig. 4 and will not be described in detail here.

The functionality of HART communication circuit 520 is consistent with the functionality of HART communication circuit 420 provided in fig. 4 and will not be described in further detail herein. However, the internal connections of HART communication circuit 520 are not consistent with those provided in fig. 4 and will be described later and will not be described in detail herein.

The function of the controller 530 is identical to that of the controller 430 provided in fig. 4 and will not be described herein.

The function of the communication module 540 is identical to that of the communication module 440 provided in fig. 4, and is not described in detail here.

The functionality of the second device 550 is identical to the functionality of the second device 450 provided in fig. 4 and will not be described in further detail herein.

Next, the internal connection relationship of the HART communication circuit 520 in the embodiment of the present application will be described.

As shown in fig. 5, the first device is connected to the HART communication module and each data acquisition circuit, respectively. The HART communication module can be connected with each data acquisition circuit respectively and used for judging whether the data acquisition circuit is in fault or not and determining a final HART communication line.

The embodiment of the application also provides a HART communication method. The method may be used in a HART communication circuit, which may include a HART communication module and at least two data acquisition circuits. The HART communication module may include a HART MODEM and a CPU. Each data acquisition circuit can comprise an IO card and a CPU. The CPU of the HART communication module may be connected to the CPU of each data acquisition circuit, respectively.

As shown in fig. 6, the HART communication method may include the following steps:

s601: the at least two paths of data acquisition circuits acquire data output by the first equipment.

Specifically, the at least two data acquisition circuits can be connected with a first device, which can be an instrument, and outputs an analog signal. Each data acquisition circuit can convert acquired analog signals into digital signals.

S602: and the at least two paths of data acquisition circuits transmit data to the HART communication module.

Specifically, the CPU of each data acquisition circuit transmits data to the CPU of the HART communication module.

S603: and the HART communication module determines a target data acquisition circuit according to the data.

Specifically, the CPU of the HART communication module may determine whether the data acquisition circuit corresponding to the data has a fault according to the data sent by each data acquisition circuit. And select a target data acquisition circuit from the non-failed data acquisition circuits.

S604: the HART communication module modulates and demodulates data.

S605: and sending the modulated and demodulated data to the second equipment by adopting a target data acquisition circuit.

In particular, the second device may be a terminal device on which software for controlling the first device may be installed.

In another embodiment, the second device may output a digital signal for adjusting an operating parameter of the first device. The at least two data acquisition circuits can acquire the digital signals output by the second device and send the data to the HART communication module. The HART communication module may determine the target data acquisition circuit from the data. And after the HART communication module modulates and demodulates the data, the modulated and demodulated data is sent to the first equipment by adopting the target data acquisition circuit.

The embodiment of the application also provides a HART communication device. As shown in fig. 7, the HART communication device may include: acquisition section 710, transmission section 720, determination section 730, and modem section 740. Wherein:

the acquisition unit 710 may be configured to acquire data output by the first device. Specifically, reference may be made to the description of S601, which is not repeated herein.

The transmitting unit 720 may be used to transmit data to the HART communication module. Specifically, reference may be made to the description of S602, which is not repeated herein.

The determination unit 730 may be configured to determine a target data acquisition circuit from the data. Specifically, reference may be made to the description of S603, which is not repeated here.

Modem 740 may be used to modulate and demodulate data. Specifically, reference may be made to the description of S604, which is not repeated herein.

The transmitting unit 750 may also be configured to transmit the modulated and demodulated data to the second device using the target data acquisition circuit. Specifically, reference may be made to the description of S605, which is not repeated herein.

The embodiment of the application also provides another HART communication device. As shown in fig. 8, HART communication device 80 may include: memory 810, and a processor 820. The memory 810 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory, and the memory 810 includes a flash in the embodiment of the present application. Memory 810 may optionally also be at least one memory system located remotely from the processor 820. As shown in fig. 8, the memory 810, which is one type of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and program instructions.

Processor 820 may be configured to invoke program instructions stored in memory 810 and cause HART communication device 80 to perform the following operations:

collecting data output by first equipment;

sending the data to the HART communication module;

determining a target data acquisition circuit according to the data;

modulating and demodulating data;

and transmitting the modulated and demodulated data to the second device.

In some embodiments, determining a target data acquisition circuit from the data comprises: judging whether a data acquisition circuit corresponding to the data is in fault according to the data;

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.

The modules in the device provided by the embodiment of the invention can be combined, divided and deleted according to actual needs.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Highway Addressable Remote Transducer (HART) communication circuit is characterized by comprising a HART communication module and at least two data acquisition circuits; wherein:

the HART communication module comprises a HART MODEM MODEM and a processor CPU;

each data acquisition circuit comprises a CPU;

the HART MODEM of the HART communication module is connected with the CPU of the HART communication module;

and the CPU of the HART communication module is respectively connected with the CPU of each data acquisition circuit and is used for acquiring data acquired by each data acquisition circuit and determining a target data acquisition circuit according to the data.

2. The HART communication circuit of claim 1, wherein the HART communication circuit comprises a two-way data acquisition circuit or a three-way data acquisition circuit.

3. The HART communication circuit according to claim 1 or 2, wherein each data acquisition circuit further comprises an input/output IO module for performing analog-to-digital (AD) conversion or digital-to-analog (DA) conversion on data.

4. The HART communication circuit of claim 3, wherein the IO module is connected to a CPU of the data acquisition circuit.

5. The HART communication circuit of any of claims 1-4, wherein the determining a target data collection circuit from the data comprises: judging whether a data acquisition circuit corresponding to the data is in fault according to the data;

6. A safety control system, comprising: the system comprises a first device, an addressable remote sensor Highway Addressable Remote Transducer (HART) communication circuit, a controller, a communication module and a second device; wherein:

the HART communication circuit comprises a HART communication module and at least two data acquisition circuits; wherein:

the HART communication module comprises a HART MODEM MODEM and a processor CPU;

each data acquisition circuit comprises a CPU;

the CPU of the HART communication module is respectively connected with the CPU of each data acquisition circuit and is used for acquiring data acquired by each data acquisition circuit and determining a target data acquisition circuit according to the data;

the first device is connected with the HART communication circuit and used for outputting analog data;

the controller is connected with the HART communication circuit and is used for processing data output by the HART communication circuit;

the communication module is connected with the controller and used for transmitting data output by the controller;

the second device is connected with the communication module and used for receiving the data output by the communication module.

7. The safety control system of claim 6, wherein the HART communication circuit comprises a two-way data acquisition circuit or a three-way data acquisition circuit.

8. The safety control system according to claim 6 or 7, wherein each of the data acquisition circuits further includes an input/output IO module, and the IO module is configured to perform analog-to-digital (AD) conversion or digital-to-analog (DA) conversion on data.

9. The security control system of claim 8, wherein the IO module is connected to a CPU of the data acquisition circuit.

10. The safety control system of any one of claims 6-9, wherein the determine target data from the data acquisition circuit comprises: judging whether a data acquisition circuit corresponding to the data is in fault according to the data;