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2. Project Design 2.1 The overall wireless communication mode of the project includes zigbee based on ieee802.15.4 wireless communication protocol, wlan based on ieee802.11 wireless communication protocol, communication technology based on ieee802.15.3 wireless communication protocol, and Bluetooth technology.
This design is a kind of asphalt station equipment that integrates wireless network transmission and involves asphalt mixing station equipment. The design idea of ​​this design: In this design, a comprehensive wireless network communication covered asphalt station is built to realize the use of industrial Ethernet between the control room monitoring console (computer) and the controller (plc) to realize the control of outdoor function modules and Wireless communication between controllers (plc). This design can realize all-round wireless network communication of the asphalt station.
2.2 Technical solutions The control console (computer) in the control room controls the indoor controller (plc) and the wireless module through the cable connection. In the control outdoor controller (plc) through the wireless module and antenna, as a client; in the control room, each function module is connected to the wireless module and antenna through the cable as an access point. In the application of the wireless network technology, the industrial Ethernet network, the first-level wireless network, and the second-level wireless network are shown in FIG. 1 . 
2.3 Wireless network The industrial Ethernet network consists of a monitoring station, an operator station, a master station controller, a substation controller, a switch, a cable, a wireless module, and an antenna. All the components of the industrial Ethernet network are in a control room. The monitoring station, operator station, master station controller, substation controller and wireless module are all connected to the switch via cables. The antenna is installed on the wireless module. Monitors, consoles, master controllers, substation controllers, and wireless modules transmit data through switches.
In the industrial Ethernet network, the monitoring station and the operating station are the management level, and the master station controller and the substation controller are the control layers. In the industrial Ethernet, the monitoring station monitors the on-site conditions (master controller, sub-station controller), prompts any normal or abnormal state, and completes the operation of the station (master controller, sub-station The station controller) operates for production purposes.
In the first-level wireless network, a master station controller, a switch, a wireless module, an antenna, a distributed part controller for a cooling material part, a distributed part controller for a metering part, a distributed controller for a stirring part, and a distributed controller for a part of a trolley .
The secondary wireless network consists of a substation controller, a switch, a wireless module, an antenna, and a burner distributed controller. In the secondary wireless network, the substation controller acts as a client and the burner part of the distributed controller acts as an access point. The substation controller completes the data read and write operations of the distributed controllers of the burner through the switch.
From the foregoing, it can be seen that the present invention is designed to use an industrial Ethernet network, a primary wireless network, and a secondary wireless network to complete the data transmission process. This kind of network construction form not only completed the data transmission of the management level and the control level, but also completed the data transmission of the control level and the equipment level. The entire transmission process is clearly structured, stable and reliable to achieve the design goals, as shown in Figure 2. 
3, software design Asphalt mixing station wireless network control method control process shown in Figure 3. 
In step s400, the flow starts and the initialization is completed. In step s401, when the monitoring console instruction is sent, there is a command sending location judgment, and when the instruction is sent to the master controller, the flow goes to s402; when the instruction is sent to the branch, When station controller, the flow goes to s416; step s402, when the monitoring console command is sent to the master controller, the master controller gets instructions to receive; in step s403, the master controller gets the monitoring console through Industrial Ethernet. The command signal, the master station controller starts to carry out the instruction transmission to the next level, ie the master station controller sends instructions. When the master station controller instructions are sent to the cold material part distributed controller, the flow goes to s404; when the master station controls When the command is sent to the metering part of the distributed controller, the flow goes to s407; when the master controller command is sent to the stirring part of the distributed controller, the flow goes to s410; when the master controller command is sent to the part of the car distributed controller When the flow goes to s413; step s404, when the master station controller sends a command to the cold part of the distributed controller, the cold part The fabric controller obtains an instruction to receive; in steps s405 and s406, when a cold component distributed controller obtains a master station controller instruction through a wireless network, it transmits the instruction through the cold material partial distributed controller and transmits the execution command to the sensor. And action actuators; step s407, when the master station controller instructions are sent to the metering part distributed controller, the metering part distributed controller is commanded to receive; steps s408 and s409, when the metering part distributed controller is obtained through the wireless network When the master station controller instructs, the measurement command is sent to the distributed controller and the execution command is passed to the sensor and the action actuator. In step s410, when the master station controller sends an instruction to the stirring section distributed controller, the stirring section The distributed controller receives the command reception; steps s411 and s412, when the agitation part distributed controller obtains the master station controller command through the wireless network, transmits the command to the sensor and the action through the agitation part of the distributed controller command transmission. Actuator; Step s413, when the master station controller sends instructions to the trolley In the case of cloth-type controllers, the distributed controller of the car receives commands; in steps s414 and s415, when the distributed controller of the car gets the instructions of the master controller through the wireless network, it is sent through the commands of the distributed controller of the car. The execution command is passed to the sensor and the action executor; Step s416, when the monitoring console command is sent to the substation controller, the substation controller receives an instruction to receive; Step s417, the substation controller is monitored through the Industrial Ethernet The station's command signal, the sub-station controller starts to carry out the command transmission to the next level, ie, the sub-station controller command is sent, when the sub-station controller command is sent to the burner part of the distributed controller, the flow goes to s418; step s418 When the substation controller command is sent to the burner part of the distributed controller, the burner part of the distributed controller is commanded to receive; steps s419 and s420, when the burner part distributed controller gets the substation controller through the wireless network When the instruction is given, the execution command is passed to the sensor through the command sent by the distributed controller of the burner section. Action actuator.
4. Concluding remarks This design is used in the communication of asphalt stations, industrial Ethernet communication from management level to control level, and wireless network communication from control level to equipment level. This design captures the pulse of the times and is at the forefront of technology, applying wireless network communications to asphalt-based systems. The wireless network communication adapts to the needs of the times and provides the asphalt station with the direction for the development of high-end products. Industrial Ethernet communication mode adopted between the management layer and the control layer; the wireless communication mode adopted between the control layer and the device layer; the master station-substation control mode adopted by the control layer; and the distributed control mode adopted by the device layer.
1. Introduction The current field wiring of asphalt mixing station is complicated, the wiring workload is large, the cable is prone to misconnection, the installation and debugging of the equipment is inconvenient, and the line failure during equipment maintenance occupies a very high proportion in the equipment failure; asphalt mixing plant At present, the field wiring is that the signal line and the power line take the same slot, and the signal line is susceptible to the interference of the large current power line in the original wiring. In order to shorten the on-site wiring workload, to facilitate the installation, commissioning and maintenance of asphalt stations, shorten the installation and commissioning period, and to facilitate equipment maintenance and reduce the equipment failure rate, wireless network communication is the best choice. The wireless network communication includes wireless data transmission such as digital signal acquisition, digital motion signal output, analog input signal acquisition, and analog signal output for each functional module of the control system. At the same time, with the development of wireless network technology, wireless network communication shows more and more advantages in anti-interference ability.
Figure 1 Network construction
Figure 2 shows an example of a wireless network
FIG. 3 is a schematic diagram of a wireless network process of an embodiment