CN204302760U - Industrial wireless sensing net switch control terminal - Google Patents

Abstract

The utility model relates to an industrial wireless sensor network switch control terminal, which comprises a main control module, a wireless module, a switch input module, a switch output module, an indicator light module, an RS232 communication module, a storage module and a power conversion module, to realize network Acquisition and processing of switching data and data wired or wireless transmission functions. The main control module is connected to the wireless module through the internal integrated UART interface, and performs functions such as parsing, storing, and switching input and output control of the received wireless data. The power module supplies power to the RS232 module, the main control module and the wireless module. The storage module is connected with the main control module through the HC interface, and is used to store information such as the group number and module address in the industrial wireless sensor network. The utility model adopts a vehicle-mounted control terminal and a communication transfer terminal to form a point-to-multipoint wireless communication network, which can reduce frequency bands and avoid mutual anti-interference between nodes.

Description

Industrial wireless sensor network switch control terminal

technical field

The utility model designs an industrial wireless sensor network switch control terminal. It belongs to the technical field of wireless communication and embedded system.

Background technique

The development of industrial control systems mainly goes through three stages: manual control, semi-automatic control and intelligent control. There is no central control room in the manual control mode, and the control is all based on experience, which is highly random. Terminal operating parameters in the semi-automatic control mode are generally set from the central control room through wired cables. The terminal equipment automatically operates according to the set parameters. During the operation, necessary intervention can be carried out according to the actual situation. It is also possible to set parameters in the central control room or order to control the operation through wired cables, or carry out wireless control by loading wireless devices. The intelligent operation mode mainly adopts the remote control mode. The operators control in the central control room and issue instructions, and the terminal equipment works according to the instructions. During the work process, the operators can monitor and intervene in the central control room. If the site is large and there are multiple devices, manual remote intervention will not be easy to achieve. Therefore, this method is generally used when there are few on-site devices. For example, Japan’s Hokuriku Electric Power Ota Nanao Power Station adopts this method. The traditional remote control is based on PLC's wired signal transmission control. Each terminal collects and processes wired signals through its own PLC, and transmits the processing result information to the central control room through wired cables. This method will easily cause cable wear and affect signal transmission over the years.

In response to this phenomenon, wireless communication technology is used to transmit control information, that is, point-to-point control. Here, the point-to-point control adopts a two-way wireless intelligent controller, which can completely replace the control cable of the terminal equipment and realize wireless control, thereby solving the problem that the breakage of the control cable in the traditional control system seriously affects production, and at the same time, it is easy to maintain and replace, saving a lot of manpower and material resources and financial resources. Point-to-point control requires two paired devices. A device and B device control each other, and the input status controls the output of the other device. The device also has self-diagnosis function, detection of whether the other device is online, fault output alarm and other functions. It is simple to configure and easy to use. , practicability, stable performance and other advantages.

In order to avoid the loss of control signals caused by cable damage or poor contact during wired transmission, and to use control system upgrades and maintenance, the frequency band utilization rate is improved compared with point-to-point and point-to-multipoint wireless control systems. In view of the large number of on-site terminal equipment and the lack of concentration, the vehicle-mounted control terminal and communication transfer terminal are used to form a point-to-multipoint wireless communication network to reduce frequency bands and avoid mutual anti-interference between machines.

Utility model content

The purpose of the utility model is to solve the deficiencies in the prior art and provide an industrial wireless sensor network switch control terminal. The switch control terminal adopts the vehicle control terminal and the communication transfer terminal to form a point-to-multipoint wireless communication network, which can reduce the frequency band and avoid mutual anti-interference between the machines. It has great development prospects and practical significance for field work with a large number of terminal devices and non-centralized distribution.

The technical problems solved by the utility model can be realized by adopting the following technical solutions:

An industrial wireless sensor network switch control terminal, which consists of a main control module, a wireless module, a switch input module, a switch output module, an indicator light module, an RS232 module, a storage module and a power conversion module, and realizes the collection of switch values in the network , Processing function.

Specifically, the wireless module receives data sent by the monitoring terminal or other control terminals, and sends instruction data to be sent by the control terminal.

Further, the main control module receives the data sent by the monitoring terminal or other control terminals through the wireless module, analyzes the data type and controls the terminal equipment to perform corresponding operations. The main control module takes the MKL25Z128VLH4 chip as the core to analyze data, reset and store parameter data.

Further, the power supply module includes two parts of power supply, a +24V to +5V module and a +5V to +3.3V module. The +24V to +5V module provides power for the RS232 module and also serves as the input power for the +5V to +3.3V module. The +5V to +3.3V module supplies power to the main control module and wireless module.

Further, the storage module is used to store information such as the group number and the address of the module in the industrial sensor network. The memory module adopts AT24C256EEPROM memory chip, its space size is 262,144 bytes, and the working voltage is +3.3V.

Further, the indicator light module includes power supply, operation, fault and communication indicator lights.

Further, the RS232 module is connected with the integrated UART0 interface inside the main control module, so as to realize the serial communication between the upper computer and the main control module.

Further, the switch input module and the switch output module. Among them, the switch input module contains 8-way switch input, which is mainly composed of two photocouplers with 4-way input and 8-way input switch status indicator light. The photoelectric coupler realizes the electrical isolation between the switch input and the main control module, which enhances the stability of the system, and the 8 indicator lights independently display the on-off status of the 8 input switches. Switch output module, including 8-way switch output, mainly composed of current driver, 8-way relay and 8-way output switch status indicator light.

Advantages and effects of the utility model: Compared with the prior art, the industrial wireless sensor network switch control terminal provided by the utility model adopts the vehicle-mounted control terminal and the communication transfer terminal to form a point-to-multipoint wireless communication network, which can reduce frequency bands, Avoid mutual anti-interference between machines. For on-site operations with a large number of terminal devices and scattered distribution, the linkage is realized through networking; the configuration and control of the control terminal is realized through the monitoring terminal. One-to-one, one-to-many, many-to-one, and many-to-many flexible configurations can be realized, that is, each wireless switch control terminal can be temporarily used as the main control terminal to control the working status of other wireless switch control terminals in the entire network. While overcoming the disadvantages brought by the traditional wired control system, it can flexibly and efficiently organize the linkage of multiple terminal devices to reduce system maintenance costs and power consumption, and improve work efficiency and system stability.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the industrial wireless sensor network switch control terminal of the present invention;

Fig. 2 is the working flowchart of the industrial wireless sensor network switch control terminal of the present invention;

Fig. 3 is the work flowchart of the power supply module in the industrial wireless sensor network switch control terminal of the utility model;

Fig. 4 is a structural design diagram of the industrial wireless sensor network switch control terminal of the utility model

Fig. 5 is the main flowchart of the industrial wireless sensor network switch control terminal of the utility model;

specific implementation plan

The utility model will be further described in detail below in conjunction with the examples, but the implementation of the utility model is not limited thereto.

Fig. 1 is a schematic diagram of the system structure of the switch control terminal based on the industrial wireless sensor network of the present invention. The control terminal includes a main control module, a wireless module, a switch input module, a switch output module, an indicator light module, an RS232 communication module, a storage module and a power conversion module.

(1) Wireless module.

Between the control terminals, the control terminal and the monitoring terminal communicate wirelessly. The wireless module is responsible for receiving and sending data. The working frequency band is 410-480MHz. In the case of sight distance, the height above the ground is > 1 meter, and the reliable transmission distance can be Up to 2700 meters, the maximum transmission power is 500mW.

Using VT-DTMSD3-433 integrated wireless module, as shown in Figure 2, it is connected with the minimum system of the main control module MKL25Z128VLH4 through the serial port.

(2) Main control module MKL25Z128VLH4.

The main control module is based on the MKL25Z128VLH4 chip. Firstly, the working parameters of the control terminal can be set according to the requirements. The setting can be realized by using a PC through the UART interface, or can be set online by using the wireless switch monitoring terminal. When working, the control terminal analyzes the data received by the wireless module, stores and forwards the data according to the analysis results, and controls the input and output of the remote switch.

(3) Power module.

The wireless switch control terminal is supplied with +24V DC power from the outside, and the maximum working current is controlled at about 500mA, and the external power supply is configured separately according to actual needs. It includes two parts of power supply: +24V to +5V module and +5V to +3.3V module, as shown in Figure 3. +24V is converted to +5V through the voltage conversion chip to provide power for the RS232 module, and at the same time, +5V is converted to +3.3V through the power conversion chip ASM1117 to supply power for the main control module and wireless module.

(4) Storage module.

The storage module is designed to store the group number of the industrial wireless sensor network, the module address and other information, using AT24C256EEPROM memory chip, its space size is 262,144 bytes, and the working voltage is +3.3V. As shown in Figure 1, the storage module is connected to the main control module through the HC.

(5) Switch input and output modules

The work of the terminal equipment is realized through the switch input and output module. Switch input module, including 8-way switch input, is mainly composed of two photocouplers with 4-way input and 8-way input switch status indicator light. The photoelectric coupler realizes the electrical isolation between the switch input and the main control module, which enhances the stability of the system, and the 8 indicator lights independently display the on-off status of the 8 input switches. Switch output module, including 8-way switch output, mainly composed of current driver, 8-way relay and 8-way output switch status indicator light. The control terminal analyzes the data received by the wireless module, and if the result of the analysis is IO control, the on-off control of the corresponding output switch is realized according to the data.

(6) Control terminal structure design

The utility model takes into account the convenience of updating and maintenance, and collects two-layer structural design schemes, as shown in Figure 4. The upper layer is the wireless module; the lower layer is the MKL25Z128VLH4 minimum system board and power circuit, switch input and output control circuit.

The main flow of the control terminal is shown in Figure 5. After the control terminal is powered on, run the MCU initialization program (including the clock, EEPROM, serial port, indicator light, and switch value initial state). Then read the data stored in the storage module to judge whether the control terminal is running for the first time. The main loop reads the PC data, and if the reading is successful, it analyzes the acquired data, and sets the corresponding parameters according to the analysis results. After the parameter setting is successful, if the wireless module receives the data, it will analyze the corresponding bit of the received data, if it is not local data, it will be forwarded, if it is local data, then the data type will be judged, and parameter setting or switch input and output control will be performed. And return the response information.

Claims (5)

1. An industrial wireless sensor network switch control terminal is characterized in that: it comprises a main control module, a wireless module, a switch input module, a switch output module, an indicator light module, an RS232 module, a storage module and a power conversion module, and realizes The collection and processing of switch data in the network and the wired or wireless data transmission function, the power supply module provides power for the RS232 module, the main control module and the wireless module. 2. The industrial wireless sensor network switch control terminal according to claim 1, characterized in that: the main control module includes a MKL252128VLH4 processor chip, a writer circuit, a crystal oscillator circuit and a reset circuit. 3. The industrial wireless sensor network switch control terminal according to claim 1, characterized in that: the switch input module includes 8 switch inputs with photoelectric isolation, and the switch output module includes 8 switches with photoelectric isolation Isolated and current driven switching output. 4. The industrial wireless sensor network switch control terminal according to claim 2, characterized in that: the IIC interface integrated inside the main control module is connected to the storage module. 5. The industrial wireless sensor network switch control terminal according to claim 2, characterized in that: the UART interface integrated in the main control module is connected to the wireless module and the RS232 module respectively.