A multi-communication protocol integrated PLC automatic liquid preparation control system

Abstract

The utility model discloses a kind of PLC automatic liquid dispensing control systems of multi-communication protocol fusion. Including man-machine interaction unit, the input end of man-machine interaction unit is simultaneously connected with the output end of communication monitoring unit and the output end of PLC control unit, the input end of PLC control unit is connected with the output end of communication management unit, the input end of communication management unit is simultaneously connected with the output end of network protocol unit and the input end of communication backup unit, the input end of network protocol unit is connected with the output end of data acquisition unit, data acquisition unit at least includes flow sensor, concentration sensor, liquid level sensor. The utility model is through setting network protocol unit and communication backup unit, when network protocol unit fails, it can automatically switch to communication backup unit to run, guarantee the continuity and stability of control and data acquisition, and by setting network protocol unit, different manufacturers' sensor and actuator can be accessed, improve system integration.

Description

Technical Field

[0001] This utility model specifically relates to a PLC automatic liquid dispensing control system that integrates multiple communication protocols. Background Technology

[0002] In chemical industries and laboratories, the precise dilution and preparation of highly corrosive and toxic chemicals (such as tetramethylammonium hydroxide, TMAH) places extremely high demands on the reliability, real-time performance, and safety of the control system. Existing solution preparation systems often employ a single communication method, typically Modbus or Ethernet, leading to poor compatibility and insufficient scalability. This, in particular, poses a high risk of system-wide failure in the event of a malfunction. Furthermore, when it becomes necessary to connect to sensors such as flow meters or actuators such as valves from different brands and using different communication protocols, system integration becomes difficult, making it challenging to build a stable and efficient control network. Utility Model Content

[0003] Purpose of this utility model: To provide a PLC automatic liquid dispensing control system that integrates multiple communication protocols, thereby solving the aforementioned problems existing in the prior art.

[0004] Technical Solution: A PLC-based automatic liquid dispensing control system integrating multiple communication protocols includes a human-machine interface unit. The input terminal of the human-machine interface unit is simultaneously connected to the output terminal of a communication monitoring unit and the output terminal of a PLC control unit. The input terminal of the PLC control unit is connected to the output terminal of a communication management unit. The input terminal of the communication management unit is simultaneously connected to the output terminal of a network protocol unit and the input terminal of a communication backup unit. The input terminal of the network protocol unit is connected to the output terminal of a data acquisition unit. The data acquisition unit includes at least a flow sensor, a concentration sensor, and a liquid level sensor.

[0005] Preferably, the PLC control unit includes a PLC master station and a PLC slave station. Both the PLC master station and the PLC slave station are equipped with and communicate with each other through the built-in MC protocol. The output terminal of the data acquisition unit is connected to the master PLC through a network protocol unit, and the PLC slave station is connected to the PLC master station through Ethernet.

[0006] Preferably, both the PLC master station and the PLC slave station include a power supply module, a CPU module, a digital input / output module, an analog input / output module, and a communication module.

[0007] Preferably, the network protocol unit includes at least Ethernet, MODBUS RTU, RS485, and RS232.

[0008] Preferably, the communication monitoring unit includes a heartbeat detection module and a link monitoring module.

[0009] Beneficial effects: This utility model relates to a PLC automatic liquid dispensing control system that integrates multiple communication protocols. By setting up a network protocol unit and a communication backup unit, when the network protocol unit fails, it can automatically switch to the communication backup unit for operation, ensuring the continuity and stability of control and data acquisition. Furthermore, by setting up the network protocol unit, different types of sensors and actuators can be connected, improving the system integration. Attached Figure Description

[0010] Figure 1 This is a block diagram of the overall system of this utility model; Figure 2 This is a system block diagram of the communication management unit of this utility model; Figure 3 This is a system block diagram of the link monitoring unit of this utility model. Detailed Implementation

[0011] like Figures 1 to 3 As shown, this utility model provides a technical solution: a PLC automatic liquid dispensing control system integrating multiple communication protocols, including a human-machine interface unit. The input terminal of the human-machine interface unit is simultaneously connected to the output terminal of a communication monitoring unit and the output terminal of a PLC control unit. The input terminal of the PLC control unit is connected to the output terminal of a communication management unit. The communication monitoring unit includes a heartbeat detection module and a link monitoring module. The input terminal of the communication management unit is simultaneously connected to the output terminal of a network protocol unit and the input terminal of a communication backup unit. The input terminal of the network protocol unit is connected to the output terminal of a data acquisition unit. The network protocol unit includes at least Ethernet, MODBUS RTU, RS485, and RS232. The data acquisition unit includes at least a flow sensor, a concentration sensor, and a liquid level sensor. By setting up a network protocol unit and a communication backup unit, when the network protocol unit fails, it can automatically switch to the communication backup unit for operation, ensuring the continuity and stability of control and data acquisition. Furthermore, by setting up a network protocol unit, different types of sensors and actuators can be connected, improving the system integration.

[0012] In a further embodiment, the PLC control unit includes a PLC master station and a PLC slave station. Both the PLC master station and the PLC slave station are equipped with and communicate with each other through the built-in MC protocol. The output terminal of the data acquisition unit is connected to the master PLC through a network protocol unit, and the PLC slave station is connected to the PLC master station through Ethernet.

[0013] In a further embodiment, the heartbeat detection module sends heartbeat packets to Ethernet, MODBUS RTU, etc., and collects heartbeat response data of each link through the link monitoring module to analyze the link health status and determine whether timeout, interruption or abnormality has occurred.

[0014] Through the above technical solution, the present invention can achieve the following working process: Solution data is collected by flow sensors, concentration sensors, and level sensors in the data acquisition unit. The data signals collected by the data acquisition unit are transmitted to the communication management unit through the network protocol unit. The communication management unit, in conjunction with the PLC control unit, parses the data signals collected by the data acquisition unit and converts them into an internal unified data format. After processing, the data is sent to the human-machine interaction unit to realize command issuance and status feedback.

[0015] The heartbeat detection module sends heartbeat packets to Ethernet, MODBUS RTU, etc., and collects heartbeat response data from each link through the link monitoring module to analyze the link health status and determine whether there is a timeout, interruption or abnormality. When the network protocol unit fails, it automatically switches to the communication backup unit to ensure the continuity and stability of control and data acquisition.

[0016] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A PLC-based automatic liquid dispensing control system integrating multiple communication protocols, characterized in that, The system includes a human-machine interface unit (HMI), whose input is connected to both the output of a communication monitoring unit and the output of a PLC control unit. The input of the PLC control unit is connected to the output of a communication management unit. The input of the communication management unit is connected to both the output of a network protocol unit and the input of a communication backup unit. The input of the network protocol unit is connected to the output of a data acquisition unit. The data acquisition unit includes at least a flow sensor, a concentration sensor, and a level sensor. The data acquisition unit is used to acquire solution data.

2. The PLC automatic liquid dispensing control system with multi-communication protocol integration according to claim 1, characterized in that, The PLC control unit includes a PLC master station and a PLC slave station. Both the PLC master station and the PLC slave station are equipped with and communicate with each other through the built-in MC protocol. The output terminal of the data acquisition unit is connected to the master station PLC through a network protocol unit, and the PLC slave station is connected to the PLC master station through Ethernet.

3. The PLC automatic liquid dispensing control system with multi-communication protocol integration according to claim 2, characterized in that, Both the PLC master station and the PLC slave station include a power supply module, a CPU module, a digital input / output module, an analog input / output module, and a communication module.

4. The PLC automatic liquid dispensing control system with multi-communication protocol integration according to claim 1, characterized in that, The network protocol units include at least Ethernet, MODBUS RTU, RS485, and RS232.

5. The PLC automatic liquid dispensing control system with multi-communication protocol fusion according to claim 1, characterized in that, The communication monitoring unit includes a heartbeat detection module and a link monitoring module.

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