CN219266803U

CN219266803U - Multichannel industrial data acquisition system

Info

Publication number: CN219266803U
Application number: CN202320325290.1U
Authority: CN
Inventors: 李辉
Original assignee: Beijing Unicircle Technology Co ltd
Current assignee: Beijing Unicircle Technology Co ltd
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-06-27
Anticipated expiration: 2033-02-27

Abstract

The utility model discloses a multichannel industrial data acquisition system, which comprises a data acquisition unit, a processor unit, a CPLD controller, a network interface unit, an analog-to-digital converter, a first storage unit and a second storage unit, wherein the processor unit is connected with the CPLD controller; the input end of the data acquisition unit is electrically connected with the vibration signal sensor to acquire an analog signal of the vibration signal sensor, the vibration signal sensor is fixedly arranged on a shell of the machine equipment, the analog-to-digital converter is connected with the output end of the data acquisition unit, and the output end of the analog-to-digital converter is electrically connected with the input end of the CPLD controller; the CPLD controller is electrically connected with the processor unit, and the processor unit is electrically connected with the network interface unit, the first storage unit and the second storage unit. The system solves the problems that the existing industrial acquisition system only has few channels to support, the traditional data acquisition system has the problem that analog signals need to pass through a multi-channel analog switch, are cut into an analog converter in a time-sharing mode to be circularly sampled, and cannot realize synchronous sampling of multiple channels.

Description

Multichannel industrial data acquisition system

Technical Field

The utility model relates to the technical field of industrial data acquisition, in particular to a multichannel industrial data acquisition system.

Background

Along with the continuous increase of the integration degree of industrialization and informatization, the large-scale development of industrial data acquisition, especially for the acquisition of industrial process data related to field device control, and the industrial intellectualization formed by industrial cloud, industrial big data and intelligent equipment has become the remarkable characteristics of a novel industrial form. The multi-layer interconnection trend formed by combining three ends and cooperatively developing also brings about large-scale upgrading of industry. However, the industrial field data acquisition is not finished, the process is not transparent, the production organization is difficult to coordinate, the management and control efficiency is low, the decision is delayed, and the like are the most outstanding "pain points" in the manufacturing industry, and the problem needs to be solved urgently. With the great force of 'two-in-one', many techniques and schemes are available to solve the data acquisition problem of specific industrial sites.

However, with the continuous deep of industrial intelligent control, in the process of industrial data acquisition, the vibration state of a large rolling mill and a motor in the metallurgical industry is acquired, the existing industrial acquisition system only supports few channels and only acquires a lower-frequency vibration signal (below 10 KHZ), and in addition, in the traditional data acquisition system, an analog signal needs to pass through a multi-channel analog switch, and is cut into an analog converter to circularly sample in a time-sharing manner, so that multi-channel real-time synchronous sampling cannot be realized.

Disclosure of Invention

The utility model provides a multi-channel industrial data acquisition system, which aims to solve the problems that the existing industrial acquisition system only has few channels to support and only aims at acquisition of low-frequency vibration signals, meanwhile, in the traditional data acquisition system, analog signals need to pass through a multi-channel analog switch and are switched into an analog converter to be circularly sampled in a time-sharing way, and multi-channel real-time synchronous sampling cannot be realized.

In order to achieve the above object, the technical scheme of the present utility model is as follows:

a multi-channel industrial data acquisition system comprising: the device comprises a data acquisition unit, a processor unit, a CPLD controller, a network interface unit, an analog-to-digital converter, a first storage unit and a second storage unit;

the input end of the data acquisition unit is electrically connected with a vibration signal sensor to acquire an analog signal of the vibration signal sensor, the vibration signal sensor comprises an acceleration sensor and an eddy current sensor, the acceleration sensor and the eddy current sensor are fixedly arranged on a shell of the machine equipment,

the analog-to-digital converter comprises a plurality of analog-to-digital conversion circuits, the input end of each analog-to-digital conversion circuit is electrically connected with the output end of the data acquisition unit through a parallel bus, the output end of the analog-to-digital conversion circuit is electrically connected with the input end of the CPLD controller, and the analog-to-digital converter is used for carrying out analog-to-digital conversion on the analog signal of the vibration signal sensor obtained by the data acquisition unit and transmitting the digital signal to the CPLD controller;

the CPLD controller is electrically connected with the processor unit, and the processor unit is used for controlling the CPLD controller to store the digital signals to the first storage unit, and the first storage unit is used for storing the digital signals converted by the analog-to-digital conversion circuit;

the processor unit is electrically connected with the network interface unit, the first storage unit and the second storage unit, and the network interface unit is used for transmitting the digital signals.

Furthermore, the processor unit adopts an STM32F429 chip of an intentional semiconductor Cortex M4 kernel, and the processor unit is connected with the CPLD controller through an SPI bus interface.

Further, the processor unit is connected with a network interface of the network interface unit through an SPI_NET interface, and the CPLD controller is electrically connected with the analog-to-digital converter through an SPI_CONFIG interface.

Further, the analog-to-digital converter is an analog-to-digital conversion chip of a plurality of analog-to-digital conversion circuit input channels, and the analog-to-digital conversion chip adopts an AD7768 chip.

Further, the CPLD controller is provided with a timer, and is electrically connected with the analog-to-digital converter through an MCLK pin, and the timer is used for generating a pulse signal;

the pulse signal is used to trigger the analog-to-digital converter to convert the analog signal to the digital signal, and the analog-to-digital converter includes at least one SYNC pin.

Further, the network interface includes an ethernet interface and a USB interface, the USB interface is connectable to an industrial device of the USB interface, the ethernet interface is connectable to an industrial field wireless communication gateway, and the communication protocol supported by the ethernet includes a MODBUS TCP communication protocol and an OPC UA communication protocol.

Furthermore, the first storage unit adopts an SDRAM chip; and the second storage unit adopts a Flash ROM storage chip.

The beneficial effects are that: the utility model provides a multichannel industrial data acquisition system, which is characterized in that a data acquisition unit is used for acquiring an analog signal acquired by a vibration signal sensor, an analog-to-digital conversion circuit of an analog-to-digital converter is electrically connected with the data acquisition unit through a parallel bus, so that the analog signal is input to the analog-to-digital converter through different analog-to-digital conversion circuits of the analog-to-digital converter, the analog-to-digital conversion is carried out to digital signals, the digital signals are transmitted to a CPLD controller, the CPLD controller is controlled by a processor unit to store the digital signals to a first storage unit, the processor unit is connected with a network interface unit for high-speed transmission of the data signals, the problem that the existing industrial acquisition system only has few channels for supporting the acquisition of vibration signals with lower frequency is solved, the synchronous acquisition of multipath analog quantity data is realized, and the working efficiency of industrial data acquisition is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of a multi-channel industrial data acquisition system of the present utility model;

FIG. 2 is a block diagram of a connection of a multi-channel industrial data acquisition system of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The present embodiment provides a multi-channel industrial data acquisition system, as shown in fig. 1 to 2, including: the device comprises a data acquisition unit, a processor unit, a CPLD controller, a network interface unit, an analog-to-digital converter, a first storage unit and a second storage unit; the input end of the data acquisition unit is electrically connected with the vibration signal sensor to acquire an analog signal of the vibration signal sensor, the vibration signal sensor comprises an acceleration sensor and an eddy current sensor, the acceleration sensor and the eddy current sensor are fixedly arranged on a shell of the machine equipment, the analog-to-digital converter comprises a plurality of analog-to-digital conversion circuits, the input end of each analog-to-digital conversion circuit is electrically connected with the output end of the data acquisition unit through a parallel bus, the output end of the analog-to-digital conversion circuit is electrically connected with the input end of the CPLD controller, and the analog-to-digital converter is used for carrying out analog-to-digital conversion on the analog signal of the vibration signal sensor acquired by the data acquisition unit and transmitting the analog signal to the CPLD controller; the CPLD controller is electrically connected with the processor unit, and the processor unit is used for controlling the CPLD controller to store the digital signals to the first storage unit, and the first storage unit is used for storing the digital signals converted by the analog-to-digital conversion circuit; the processor unit is electrically connected with the network interface unit, the first storage unit and the second storage unit, and the network interface unit is used for transmitting the digital signals.

Based on the above scheme, the data acquisition unit is used for acquiring the acquired analog signals of the vibration signal sensor, the analog-to-digital conversion circuit of the analog-to-digital converter is electrically connected with the data acquisition unit through the parallel bus, so that the analog signals are input into the analog-to-digital converter through different analog-to-digital conversion circuits of the analog-to-digital converter to be converted into digital signals, the processor unit is used for controlling the CPLD controller to store the digital signals into the first storage unit, the processor unit is connected with the network interface unit for digital signal transmission, the problem that the existing industrial acquisition system only has few channels for supporting, and the synchronous acquisition of multipath analog quantity data is realized aiming at the acquisition of the vibration signals with lower frequency, and the working efficiency of industrial data acquisition is improved.

Specifically, when the processor unit starts to work, firstly, configuration DATA in the second storage unit is read through a DATA communication connection line DATA [7..0], the configuration DATA comprises working speed, IP address and port number information, the processor unit carries out initialization setting on the network interface unit through an SPI_NET interface according to the configuration DATA, an analog-to-digital converter is carried out initialization setting through an SPI_CONFIG interface connected with the CPLD controller, the analog-to-digital converter acquires analog signals acquired by a vibration signal sensor acquired by the DATA acquisition unit through eight analog signal input channels of Ain-0, ain-1, ain-2, ain-3, ain-4, ain-5, ain-6 and Ain-7, and a timer of the CPLD controller is electrically connected with the analog-to-digital converter through an MCLK pin and generates pulse signals, and the pulse signals trigger the analog-to-digital converter to convert the analog signals into the digital signals. Transmitting the digital signals to a CPLD controller through a DATA connecting line CPU_DATA [15..0] for DATA structure adjustment and clock domain conditioning, wherein the processor unit controls the CPLD controller to store the digital signals to a first storage unit, when the DATA signal quantity stored by the first storage unit reaches a preset value, the processor unit carries out signal processing on the digital signals of the first storage unit to obtain a plurality of characteristic values of vibration signals, and finally the processor unit carries out remote transmission through a network interface unit of an SPI_NET interface; by realizing synchronous acquisition of multipath analog data, the problems of large workload of industrial data acquisition, long debugging period and large operation pressure of a server are solved. The control program of the CPLD controller and the processor unit and the data processing (such as the characteristic value obtaining process) performed by the program in this embodiment are both direct utilization of the prior art, and are not the utility model points of the present application, and are not described herein.

In a specific embodiment, the processor unit adopts an STM32F429 chip of an intentional semiconductor Cortex M4 kernel, and the processor unit is connected with the CPLD controller through an SPI bus interface. The STM32F429 chip of the semiconductor Cortex M4 kernel has low cost and low development investment cost, saves the working time of developers, improves the efficiency, adopts SPI bus interface connection, has simple communication, supports full duplex communication and has high data transmission rate.

In a specific embodiment, the processor unit is connected to a network interface of the network interface unit through an spi_net interface, and the CPLD controller is electrically connected to the analog-to-digital converter through an spi_config interface.

In a specific embodiment, the analog-to-digital converter is an ADC conversion chip of an input channel of an 8 analog-to-digital conversion circuit, and the ADC conversion chip adopts an AD7768 chip. The analog-digital converter based on the input channel of the 8 analog-digital conversion circuit can realize synchronous acquisition and synchronous reading of the multichannel analog quantity; the number of channels of the cascade AD conversion chip can be 8 channels or more, for example, synchronous data acquisition of 16 channels can be realized by cascading two AD conversion chips, so that the data acquisition efficiency can be improved.

In a specific embodiment, the CPLD controller is provided with a timer, and is electrically connected with the analog-to-digital converter through an MCLK pin, and the timer is used for generating a pulse signal; the pulse signal is used to trigger the analog-to-digital converter to convert the analog signal to the digital signal, and the analog-to-digital converter includes at least one SYNC pin. The timer is respectively and electrically connected with the MCLK pin of the analog-to-digital converter and the SYNC synchronous pin of the analog-to-digital converter, so that the MCLK pin and the SYNC synchronous pin are connected with one pulse signal, and synchronous triggering and synchronous sampling of the multichannel analog data sampling are realized.

In a specific embodiment, the network interface includes an ethernet interface and a USB interface, the USB interface is connectable to an industrial device of the USB interface, the ethernet interface is connectable to an industrial field wireless communication gateway, and the communication protocol supported by the ethernet includes a MODBUS TCP communication protocol and an OPC UA communication protocol.

In a specific embodiment, the first memory unit adopts an SDRAM chip; the second storage unit adopts a Flash ROM storage chip, and the Flash ROM storage chip is used for storing code programs of the industrial data acquisition system. The SDRAM chip is 168 feet, which is a memory used by the current PENTIUM and above, and can lock a CPU and a RAM in a CPLD controller together through the same clock, so that the CPU and the RAM can share one clock cycle and synchronously work at the same speed, and the rising edge of each clock pulse starts to transmit data, so that the speed is obviously improved compared with an EDO memory; the Flash ROM memory chip belongs to a single-voltage chip, and the Flash ROM memory chip also executes a special refreshing program when being erased, but takes a Sector (also called Block) as a minimum unit instead of Byte when deleting data, the size of the Sector is different according to different manufacturers, and only when writing, the Sector is written in by taking Byte as the minimum unit; the read and write operations of the FLASH ROM chip are carried out under single voltage, and the content of the FLASH ROM chip can be conveniently modified by using a special program without jumper wires; the FLASH ROM has a storage capacity generally larger than that of the EEPROM and about 512K to 8M KBit, is suitable for storing program codes due to mass production, combines the advantages of the ROM and the RAM, has the performance of Electronic Erasable Programmable (EEPROM), can quickly read data (the advantages of NVRAM), ensures that the data cannot be lost due to power failure, and has a better protection effect on user data. The code programs mentioned in the present embodiment are all direct utilization of the prior art, and are not described herein in detail.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A multi-channel industrial data acquisition system, comprising: the device comprises a data acquisition unit, a processor unit, a CPLD controller, a network interface unit, an analog-to-digital converter, a first storage unit and a second storage unit;

2. The multi-channel industrial data acquisition system according to claim 1, wherein the processor unit is an STM32F429 chip with an intentional semiconductor Cortex M4 kernel, and the processor unit is connected with the CPLD controller by an SPI bus interface.

3. The multi-channel industrial data collection system of claim 1 wherein the processor unit is connected to a network interface of the network interface unit via an spi_net interface, and wherein the CPLD controller is electrically connected to the analog-to-digital converter via an spi_config interface.

4. The multi-channel industrial data acquisition system of claim 1 wherein the analog-to-digital converter is an ADC conversion chip for a plurality of analog-to-digital conversion circuit input channels and the ADC conversion chip is an AD7768 chip.

5. The multi-channel industrial data acquisition system according to claim 1, wherein the CPLD controller is provided with a timer, and the CPLD controller is electrically connected with the analog-to-digital converter through an MCLK pin, and the timer is used for generating a pulse signal;

6. The multi-channel industrial data collection system of claim 1 wherein the network interface comprises an ethernet interface and a USB interface, the USB interface is connectable to an industrial device of the USB interface, the ethernet interface is connectable to an industrial field wireless communication gateway, and the ethernet-supported communication protocol comprises a MODBUS TCP communication protocol and an OPC UA communication protocol.

7. The multi-channel industrial data acquisition system of claim 1 wherein the first memory unit is an SDRAM chip;

and the second storage unit adopts a Flash ROM storage chip.