A PLC-based electrical control system

Abstract

The application belongs to the technical field of electrical control systems, and discloses a PLC-based electrical control system, which comprises a CPU module, a power module, an input module, an output module, a memory module, an I / O expansion module, an Ethernet module, a programmer unit, an Internet of Things gateway unit, a cloud platform unit and a mobile terminal. The Ethernet module, the Internet of Things gateway unit, the cloud platform unit and the mobile terminal are arranged, so that the real-time monitoring of the PLC electrical control system by an operator is realized. When the PLC electrical control system is running, real-time data is transmitted to the cloud platform through the Ethernet module and the Internet of Things gateway, and the operator accesses the cloud platform through the mobile terminal to remotely monitor, debug and control the PLC electrical control system, so that the automation and informatization of the production process are realized, and the operator does not need to be present on site, thereby improving the convenience of the PLC electrical control system.

Description

Technical Field

[0001] This invention belongs to the field of electrical control system technology, specifically a PLC-based electrical control system. Background Technology

[0002] PLC control systems are a new generation of industrial control devices formed by introducing microelectronics, computer technology, automatic control technology, and communication technology on the basis of traditional sequential controllers. After the user has debugged the user program, the program is written into the PLC memory through a programmer. At the same time, the field input signals and the controlled actuators are connected to the input terminals of the input module and the output terminals of the output module respectively. Then, the PLC is selected to run mode, and the subsequent work is completed by the PLC according to the user program. It has the characteristics of strong versatility, ease of use, wide adaptability, high reliability, strong anti-interference ability, and simple programming.

[0003] With the development and progress of technology, PLC-based electrical control systems are widely used in various fields. However, existing PLC electrical control systems still have shortcomings in actual use. Traditional PLC electrical control systems are generally set up in the field. When the system is subsequently debugged, monitored and controlled, operators need to go to the field to operate it. This method makes it impossible for operators to obtain the operating status of the field equipment in a timely manner. When operators are in other places and cannot get to the field in time, the field equipment will stop operating due to failure. Therefore, this needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a PLC-based electrical control system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a PLC-based electrical control system, comprising a CPU module, a power supply module, an input module, an output module, a memory module, an I / O expansion module, an Ethernet module, a programmer unit, an IoT gateway unit, a cloud platform unit, and a mobile terminal, wherein:

[0006] The CPU module is used to receive input signals, perform logical calculations, and then output control signals to control external devices.

[0007] The power module is used to provide electrical power to the PLC system to ensure that the PLC system works normally.

[0008] The input module is used to receive external signals and convert them into digital signals that the PLC can understand;

[0009] The output module is used to receive signals from the CPU module and convert them into output signals in the form of current and voltage under load, for controlling external devices;

[0010] The memory module is divided into a system program memory and a user program memory, used to store system program running data and user program running data;

[0011] The I / O expansion module is divided into an I / O expansion unit and a special function unit, which are used to increase the functionality of the CPU module.

[0012] The Ethernet module is used to connect to the CPU module;

[0013] The programmer unit is used to connect to the Ethernet module to program the PLC.

[0014] The IoT gateway unit is used to connect to the Ethernet module and interact with the operating data of the PLC electrical control system through the Ethernet module;

[0015] The cloud platform unit is used to enable remote monitoring, remote debugging, and remote control of the PLC electrical control system.

[0016] The mobile device is used to access and log in to the cloud platform.

[0017] As a preferred embodiment of the present invention, the CPU module uses a high-speed CPU by default, and the CPU type can be changed according to actual needs.

[0018] As a preferred embodiment of the present invention, the power supply module includes an AC power supply module and a DC power supply module. The AC power supply module can provide AC power, and the DC power supply module can provide DC power.

[0019] As a preferred embodiment of the present invention, the I / O expansion unit is used to expand the number of I / O points of the PLC, and the number of I / O points expanded by the I / O expansion unit is eight.

[0020] As a preferred embodiment of the present invention, the special function unit is used to connect to an external special function module, and it is independently constructed in the form of a dedicated module.

[0021] As a preferred embodiment of the present invention, the Ethernet module is wired to the programmer unit and the IoT gateway unit via a network cable and a network cable interface, respectively, and the IP address, port number and communication protocol are set during the connection.

[0022] As a preferred embodiment of the present invention, after the programmer unit and the IoT gateway unit are connected to the Ethernet module, they verify whether the two parties can communicate normally by sending test data or instructions.

[0023] As a preferred embodiment of the present invention, the cloud platform is configured with remote access permissions, and the mobile terminal accesses the cloud platform using an account and password.

[0024] As a preferred embodiment of the present invention, the IoT gateway interacts and transmits data with the cloud platform unit through the MQTTOPC protocol.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention enables operators to remotely monitor the PLC electrical control system in real time by setting up an Ethernet module, an IoT gateway unit, a cloud platform unit, and a mobile terminal. When the PLC electrical control system is running, it transmits real-time data to the cloud platform through the Ethernet module and IoT gateway. Operators can then access the cloud platform through their mobile terminals to remotely monitor, debug, and control the PLC electrical control system, thereby automating and informatizing the production process without requiring operators to be physically present, thus improving the convenience of the PLC electrical control system. Attached Figure Description

[0027] Figure 1 This is a system block diagram of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, this embodiment of the invention provides a PLC-based electrical control system, including a CPU module, a power supply module, an input module, an output module, a memory module, an I / O expansion module, an Ethernet module, a programmer unit, an IoT gateway unit, a cloud platform unit, and a mobile terminal, wherein:

[0030] The CPU module is used to receive input signals, perform logical calculations, and then output control signals to control external devices.

[0031] The power module is used to provide electrical power to the PLC system to ensure that the PLC system works normally;

[0032] The input module is used to receive external signals and convert them into digital signals that the PLC can understand;

[0033] The output module receives signals from the CPU module and converts them into output signals in the form of current and voltage under load, which are used to control external devices.

[0034] The memory module is divided into system program memory and user program memory, used to store system program running data and user program running data;

[0035] The I / O expansion module is divided into I / O expansion units and special function units, which are used to increase the functionality of the CPU module.

[0036] The Ethernet module is used to connect to the CPU module;

[0037] The programmer unit is used to connect to the Ethernet module to program the PLC.

[0038] The IoT gateway unit is used to connect to the Ethernet module and interact with the operating data of the PLC electrical control system through the Ethernet module;

[0039] The cloud platform unit is used to enable remote monitoring, remote debugging, and remote control of the PLC electrical control system;

[0040] The mobile app is used to access and log in to the cloud platform.

[0041] The CPU module of this invention is the core component of the PLC electrical control system. External device signals are converted into PLC-specific digital signals through the input module and then sent to the CPU module for processing. After logical calculation by the CPU module, the signals are output as control signals, which are then sent to the output module. The output module converts the control signals into current and voltage output signals to control the operation of external devices, thus completing the entire PLC control. The PLC relies on the power supply module to obtain the electrical energy required for operation. The memory module stores data for easy viewing. The I / O expansion module can be used to increase the functionality of the CPU module. Through the programmer unit, operators can write programs and download them to the CPU module via the Ethernet module. Simultaneously, operators can access the cloud platform via a mobile terminal to remotely monitor, debug, and control the operation of the PLC control system. The cloud platform can interact with the PLC's CPU module through the IoT gateway unit and the Ethernet module, thereby realizing remote operation of the PLC electrical control system without requiring operators to be physically present, thus improving the convenience of using the PLC electrical control system.

[0042] The CPU module uses a high-speed CPU by default, but the CPU type can be changed according to actual needs.

[0043] CPU modules are mainly classified according to their functions, performance, and application scenarios. They can be divided into economy CPU modules, standard CPU modules, outdoor CPU modules, and fail-safe CPU modules. Economy CPU modules are suitable for applications with strict cost requirements. Standard CPU modules provide more powerful processing capabilities and scalability, and are suitable for applications that require higher performance processing and data throughput. Outdoor and fail-safe CPU modules are used in specific environments, such as outdoor applications or applications that need to meet specific safety standards. Selecting the right CPU module can effectively ensure the reliability, performance, and cost-effectiveness of the system.

[0044] The power supply module includes an AC power supply module and a DC power supply module. The AC power supply module can provide AC power, and the DC power supply module can provide DC power.

[0045] Depending on the power supply method and output mode required by each PLC module, the power supply module can effectively meet the power supply needs of each module.

[0046] The I / O expansion unit is used to expand the number of I / O points of the PLC. The I / O expansion unit expands the number of I / O points by eight.

[0047] When the number of I / O points required by the user for the PLC exceeds the number of I / O points of the basic PLC unit, that is, when the number of I / O points of the host unit (with CPU) cannot meet the requirements of the number of I / O devices, an I / O expansion unit (without CPU) can be connected to the host unit to increase the number of I / O points of the PLC to meet the requirements of the control system. Its expansion capability is mainly limited by the CPU addressing capability and the host drive capability.

[0048] Among them, the special function unit is used to connect to external special function modules, and it is independently constructed in the form of a dedicated module.

[0049] Special function modules include timer modules, counter modules, arithmetic modules, comparison modules, shift register modules, motion control modules, safety modules, data storage modules, etc. Different special function modules can be added to expand the control capabilities and application range of the PLC according to different application requirements.

[0050] The Ethernet module is wired to the programmer unit and the IoT gateway unit via a network cable and a network cable interface, respectively, and the IP address, port number and communication protocol are set during the connection.

[0051] IoT gateways and programmers need to be on the same local area network as the PLC and assigned the correct IP address. This connection method is simple and easy to use, and the data exchange and transmission is more stable and reliable compared to wireless connections.

[0052] Among them, after the programmer unit and the IoT gateway unit are connected to the Ethernet module, they verify whether the two parties can communicate normally by sending test data or commands.

[0053] After connection testing, it can be ensured that the connection is normal, thus providing communication guarantee for subsequent remote control.

[0054] The cloud platform is configured with remote access permissions, and mobile devices can access the cloud platform using an account and password.

[0055] By configuring appropriate access permissions, unauthorized access and operations can be prevented, thereby ensuring the security of remote access.

[0056] The IoT gateway interacts and transmits data with the cloud platform unit through the MQTTOPC protocol.

[0057] MQTTOPC is a communication protocol used in industrial automation. It allows data to be exchanged between OPC UA (Open Platform UA) and MQTT servers. It is commonly used for communication between IoT devices and OPC UA servers. The MQTTOPC protocol allows devices to publish data to MQTT brokers and allows OPC UA servers to subscribe to this data.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PLC-based electrical control system, characterized in that, It includes a CPU module, power supply module, input module, output module, memory module, I / O expansion module, Ethernet module, programmer unit, IoT gateway unit, cloud platform unit, and mobile terminal, among which: The CPU module is used to receive input signals, perform logical calculations, and then output control signals to control external devices. The power module is used to provide electrical power to the PLC system to ensure that the PLC system works normally. The input module is used to receive external signals and convert them into digital signals that the PLC can understand; The output module is used to receive signals from the CPU module and convert them into output signals in the form of current and voltage under load, for controlling external devices; The memory module is divided into a system program memory and a user program memory, used to store system program running data and user program running data; The I / O expansion module is divided into an I / O expansion unit and a special function unit, which are used to increase the functionality of the CPU module. The Ethernet module is used to connect to the CPU module; The programmer unit is used to connect to the Ethernet module to program the PLC. The IoT gateway unit is used to connect to the Ethernet module and interact with the operating data of the PLC electrical control system through the Ethernet module; The cloud platform unit is used to enable remote monitoring, remote debugging, and remote control of the PLC electrical control system. The mobile device is used to access and log in to the cloud platform.

2. The PLC-based electrical control system according to claim 1, characterized in that: The CPU module uses a high-speed CPU by default, and the CPU type can be changed according to actual needs.

3. The PLC-based electrical control system according to claim 1, characterized in that: The power module includes an AC power module and a DC power module. The AC power module can provide AC power, and the DC power module can provide DC power.

4. The PLC-based electrical control system according to claim 1, characterized in that: The I / O expansion unit is used to expand the number of I / O points of the PLC, and the number of I / O points expanded by the I / O expansion unit is eight.

5. The PLC-based electrical control system according to claim 1, characterized in that: The special function unit is used to connect to an external special function module, and it is independently constructed in the form of a dedicated module.

6. The PLC-based electrical control system according to claim 1, characterized in that: The Ethernet module is wired to the programmer unit and the IoT gateway unit via a network cable and a network cable interface, respectively, and the IP address, port number and communication protocol are set during the connection.

7. The PLC-based electrical control system according to claim 1, characterized in that: After the programmer unit and the IoT gateway unit are connected to the Ethernet module, they verify whether the two parties can communicate normally by sending test data or commands.

8. The PLC-based electrical control system according to claim 1, characterized in that: The cloud platform is configured with remote access permissions, and the mobile device accesses the cloud platform using an account and password.

9. The PLC-based electrical control system according to claim 1, characterized in that: The IoT gateway interacts and transmits data with the cloud platform unit via the MQTTOPC protocol.

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