MODBUS bus type cascade pressure switch

Abstract

The utility model provides a MODBUS bus type cascade pressure switch, which belongs to the technical field of pressure switches and comprises a plurality of groups of pressure switches and a communication box, and each pressure switch is provided with an air pressure detection module, a first MCU (Microprogrammed Control Unit) control module and a 5PIN terminal; the communication box is provided with a second MCU control module, an RS485 communication interface and a plurality of groups of 5PI N ports; the 5PIN terminal is electrically connected with the 5PIN port through a 5PIN connecting line, and the RS485 communication interface is electrically connected with the upper computer through the 5PIN connecting line. According to the device, through the cascade structure arrangement of the 5PIN terminal and the communication box, power supplies, RS485 communication and switching value signals of multiple groups of pressure switches can be integrated to a single 5PIN connecting line, the wiring process of a multi-point monitoring scene is greatly simplified, and the installation and maintenance convenience of the device is improved.

Description

Technical Field

[0001] This utility model belongs to the field of pressure switch technology, and more specifically, it relates to a MODBUS bus-type cascaded pressure switch. Background Technology

[0002] In the field of industrial automation process control, pressure switches are often used for multi-point air pressure monitoring. For example, in control systems that require multi-point air pressure monitoring, in order to achieve centralized management of air pressure at multiple monitoring points, there are often situations during equipment operation where the air pressure at multiple monitoring points needs to be monitored in real time. At this time, a MODBUS bus-type cascaded pressure switch is needed to achieve synchronous monitoring and data aggregation of air pressure at multiple monitoring points, so that staff can understand the air pressure status at each point in a timely manner and make adjustments.

[0003] However, traditional bus-type pressure gauges do not have the function of reading the status of multiple pressure switches at once with a single command. As a result, in monitoring processes with high real-time requirements, the response speed is slowed down because it is necessary to poll and read the status of each pressure switch one by one. Under the influence of rapid changes in air pressure, abnormal air pressure conditions can easily go undetected, which can easily cause equipment damage. This not only affects the normal operation of production and reduces production efficiency, but also increases manpower and time costs due to equipment maintenance and troubleshooting, thus affecting the stability of the entire control system. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a MODBUS bus-type cascaded pressure switch, which solves the technical problems of complex wiring and insufficient real-time performance in multi-point monitoring in the prior art.

[0005] The purpose and effect of this MODBUS bus-type cascaded pressure switch are achieved by the following specific technical means:

[0006] A MODBUS bus-type cascaded pressure switch includes multiple pressure switches and a communication box. Each pressure switch is equipped with a pressure detection module, a first MCU control module, and a 5-pin terminal. The communication box is equipped with a second MCU control module, an RS485 communication interface, and multiple 5-pin ports. The 5-pin terminals and the 5-pin ports are electrically connected via 5-pin connecting wires, and the RS485 communication interface is electrically connected to a host computer via 5-pin connecting wires.

[0007] According to a preferred embodiment, the pressure switch is further provided with a display module and a button module, and the display module and the button module are respectively electrically connected to the first MCU control module.

[0008] According to a preferred embodiment, the number of pressure switches is one to thirty-one groups, and the number of multiple groups of 5-pin ports corresponds to the number of pressure switches.

[0009] According to a preferred embodiment, the 5PIN terminal includes a power supply pin, an RS485 communication pin, and a digital output pin, which are respectively connected to the power supply pin, RS485 communication pin, and digital input pin of the 5PIN port.

[0010] According to a preferred embodiment, the output terminal of the air pressure detection module is electrically connected to the input terminal of the first MCU control module; the output terminal of the first MCU control module is electrically connected to the switch output port and the RS485 communication port respectively.

[0011] According to a preferred embodiment, the second MCU control module is electrically connected to multiple sets of the 5PIN ports and the RS485 communication interface.

[0012] According to a preferred embodiment, the host computer is electrically connected to the pressure switch via the communication box.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model, through a cascaded structure of "5-pin terminals + communication box," enables the device to integrate the power supply, RS485 communication, and switching signals of multiple pressure switches onto a single 5-pin connection line. This significantly simplifies the wiring process in multi-point monitoring scenarios and improves the ease of installation and maintenance. The device can centrally connect one to thirty-one pressure switches via multiple 5-pin ports in the communication box, avoiding the complex wiring problems caused by separate wiring for multiple pressure switches in traditional methods. This makes wiring more convenient in multi-point monitoring scenarios such as industrial automated production lines and improves the device's adaptability to complex environments.

[0015] 2. When using this device, the device can aggregate the switching status of all pressure switches through the second MCU control module of the communication box. The host computer can read the switching status of up to 31 pressure switches at once with a single instruction by calling the dedicated station number (32) of the communication box, without polling them one by one. This improves the response speed of the device in scenarios with high real-time requirements and enhances the device's ability to quickly capture abnormal air pressure. Then, through the cooperation of the MODBUS protocol and the RS485 communication interface, the device can meet the host computer's requirements for individual reading and parameter setting of the real-time air pressure of each pressure switch, while also taking into account the high real-time switching status acquisition. This reduces the risk of equipment damage caused by response delay and improves the reliability and practicality of the device in industrial automation control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembled structure of this utility model;

[0017] Figure 2 This is a first schematic diagram of the pressure switch of this utility model;

[0018] Figure 3 This is a second schematic diagram of the pressure switch of this utility model;

[0019] Figure 4 This is a schematic diagram of the principle of this utility model;

[0020] Figure 5 This is a block diagram of the pressure switch principle;

[0021] Figure 6 This is a block diagram of the communication box.

[0022] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0023] 11. Air pressure detection module; 12. First MCU control module; 13. 5-pin terminal; 14. Second MCU control module; 15. RS485 communication interface; 16. 5-pin port; 17. Host computer; 18. Display module; 19. Button module. Detailed Implementation

[0024] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solution of this utility model, but should not be used to limit the scope of protection of this utility model.

[0025] Example:

[0026] like Figures 1 to 6 As shown, this utility model provides a MODBUS bus-type cascaded pressure switch, including multiple pressure switches and a communication box. The pressure switch is equipped with a pressure detection module 11, a first MCU control module 12, and a 5-pin terminal 13; the communication box is equipped with a second MCU control module 14, an RS485 communication interface 15, and multiple 5-pin ports 16. This configuration integrates the core functions of pressure detection, data processing, and cascaded communication, enabling the device to form a cascaded architecture of "distributed pressure switch detection + centralized management of the communication box," thereby improving the integration of the device.

[0027] The 5-pin terminal 13 and the 5-pin port 16 are electrically connected via a 5-pin connector, and the RS485 communication interface 15 is electrically connected to the host computer 17 via a 5-pin connector. This configuration integrates power supply, data communication, and switch signals into a single connector, eliminating the need for multiple separate lines and improving the wiring simplicity and installation efficiency of the device.

[0028] The pressure switch is also equipped with a display module 18 and a button module 19, which are electrically connected to the first MCU control module 12. The display module 18 is used to display the air pressure value, the display unit, and the switch threshold, while the button module 19 is used to manually set the above parameters. This configuration enables local parameter configuration and status visualization, allowing the device to complete basic debugging even without a host computer, thus improving the ease of on-site operation.

[0029] The number of pressure switches ranges from one to thirty-one groups, with multiple groups of 5-pin ports corresponding to the number of pressure switches. This configuration allows for adjustment of the cascading scale based on the number of monitoring points, enabling the device to adapt to scenarios with 1 to 31 monitoring points.

[0030] Furthermore, in addition to the 5-pin port 16 corresponding to the actual number of pressure switches, the communication box also has an additional station (e.g., station number 32). This additional station has a special function: it can aggregate the switch output status from all pressure switches (up to 31). With this setting, the host computer 17 only needs to send a command to station number 32 to obtain the switch output status of all pressure switches at once, improving the system's efficiency in acquiring status information from multiple pressure switches. This is especially suitable for applications with high real-time requirements, enabling responses to potential gas pressure anomalies, facilitating timely decision-making by management personnel, and ensuring the stable operation of the entire monitoring system.

[0031] The 5-pin terminal 13 includes a power supply pin, an RS485 communication pin, and a digital output pin, which are respectively connected to the power supply pin, RS485 communication pin, and digital input pin of the 5-pin port 16. This configuration enables the corresponding transmission of power, communication, and digital signals, making each signal link of the device independent and stable, and improving the signal transmission reliability of the device.

[0032] The output of the air pressure detection module 11 is electrically connected to the input of the first MCU control module 12; the output of the first MCU control module 12 is electrically connected to the switch output port and the RS485 communication port, respectively. This configuration forms a complete closed loop of "air pressure acquisition - data processing - signal output", enabling the device to convert detection data into switch control signals and communication data, thereby improving the monitoring and response accuracy of the device.

[0033] The second MCU control module 14 is electrically connected to multiple 5-pin ports 16 and an RS485 communication interface 15. This configuration allows for the aggregation of signals from each pressure switch and the completion of protocol conversion with the host computer, enabling centralized management and interaction of multi-device data and improving the centralized control efficiency of the device.

[0034] The host computer 17 is electrically connected to the pressure switches via a communication box. This configuration enables the host computer 17 to uniformly monitor and configure the parameters of multiple pressure switches, forming a hierarchical control structure of "host computer 17 - communication box - pressure switches," thereby improving the device's large-scale management capabilities.

[0035] The specific usage and function of this embodiment are as follows:

[0036] Based on the actual number of monitoring points (1 to 31), the 5-pin terminal 13 of each pressure switch is connected to the 5-pin port 16 of the communication box via a 5-pin connecting cable to achieve integrated connection of power supply, RS485 communication and switch signal. The communication box is then connected to the host computer 17 via the RS485 communication interface 15 through a 5-pin connecting cable. Parameter configuration can be manually completed through the button module 19 of the pressure switch. The display module 18 displays the real-time air pressure value, display unit and switch threshold, etc., or the host computer 17 can send MODBUS commands to the corresponding pressure switch through the communication box for remote setting. When reading data, the host computer 17 can read the real-time air pressure of each pressure switch according to station number 1-31, or read the switch output status of the 31 pressure switches summarized by the communication box at once through station number 32. Its function is to enable MODBUS communication reading of air pressure at multiple points in multi-point monitoring scenarios through a single line and a 485 port, solving the problem of complex wiring in traditional multi-point monitoring. At the same time, for high real-time requirements, by reading station number 32, the switch status of up to 31 meters can be quickly obtained with a single command, improving the real-time performance and efficiency of monitoring, and facilitating centralized management and rapid response to abnormal air pressure situations.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments.

Claims

1. A MODBUS bus-type cascaded pressure switch, comprising multiple pressure switches and a communication box, characterized in that: The pressure switch is equipped with a pressure detection module (11), a first MCU control module (12) and a 5PIN terminal (13); the communication box is equipped with a second MCU control module (14), an RS485 communication interface (15) and multiple 5PIN ports (16); the 5PIN terminal (13) and the 5PIN port (16) are electrically connected by a 5PIN connection line, and the RS485 communication interface (15) is electrically connected to the host computer (17) by a 5PIN connection line.

2. The MODBUS bus-type cascaded pressure switch according to claim 1, characterized in that: The pressure switch is also provided with a display module (18) and a button module (19), and the display module (18) and the button module (19) are electrically connected to the first MCU control module (12) respectively.

3. A MODBUS bus-type cascaded pressure switch according to claim 2, characterized in that: The number of pressure switches is one to thirty-one groups, and the number of multiple groups of the 5PIN ports (16) corresponds to the number of pressure switches.

4. A MODBUS bus-type cascaded pressure switch according to claim 3, characterized in that: The 5PIN terminal (13) includes a power supply pin, an RS485 communication pin, and a digital output pin, which are respectively connected to the power supply pin, RS485 communication pin, and digital input pin of the 5PIN port (16).

5. A MODBUS bus-type cascaded pressure switch according to claim 4, characterized in that: The output terminal of the air pressure detection module (11) is electrically connected to the input terminal of the first MCU control module (12); the output terminal of the first MCU control module (12) is electrically connected to the switch output port and the RS485 communication port respectively.

6. A MODBUS bus-type cascaded pressure switch according to claim 5, characterized in that: The second MCU control module (14) is electrically connected to multiple sets of the 5PIN ports (16) and the RS485 communication interface (15).

7. A MODBUS bus-type cascaded pressure switch according to claim 1, characterized in that: The host computer (17) is electrically connected to the pressure switch through the communication box.

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