CN220232289U - Programmable logic controller and control system - Google Patents
Programmable logic controller and control system Download PDFInfo
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- CN220232289U CN220232289U CN202322351524.2U CN202322351524U CN220232289U CN 220232289 U CN220232289 U CN 220232289U CN 202322351524 U CN202322351524 U CN 202322351524U CN 220232289 U CN220232289 U CN 220232289U
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Abstract
The application provides a programmable logic controller and a control system, and relates to the technical field of programmable logic controllers. The programmable logic controller includes: the device comprises an input unit, a password transmission device, a processing unit and an output unit; the password transmission device is respectively connected with the input unit and the processing unit in a communication way; the input unit is used for acquiring a first control signal; the password transmission device is used for carrying out password operation on the first control signal to obtain a second control signal and forwarding the second control signal to the processing unit; the processing unit is in communication connection with the output unit; and the processing unit is used for forwarding the second control signal to the output unit. The programmable logic controller solves the problem that the probability of data leakage is greatly improved due to the fact that the transmission of control signals faces increasingly frequent network attacks.
Description
Technical Field
The present disclosure relates to the field of programmable logic controllers, and more particularly, to a programmable logic controller and a control system.
Background
A programmable controller (Programmable Logic Controller, PLC) is a programmable device, and is powerful and widely installed on various engineering machinery equipment. The programmable controllers form a control system, and the master control equipment can control the controlled equipment simultaneously through the control system.
In the control system, a programmable controller disposed at the master station transmits a control signal to the programmable controller disposed at the slave station. However, the transmission of control signals is faced with increasingly frequent network attacks, resulting in a greatly improved probability of data leakage. Ensuring the safety and integrity of control signal transmission is a problem to be solved in the present utility model.
Disclosure of Invention
The application provides a programmable logic controller and a control system, which are used for solving the problem that the transmission of control signals faces increasingly frequent network attacks, so that the probability of data leakage is greatly improved.
In a first aspect, the present application provides a programmable logic controller comprising: the device comprises an input unit, a password transmission device, a processing unit and an output unit;
the password transmission device is respectively connected with the input unit and the processing unit in a communication way;
the input unit is used for acquiring a first control signal;
the password transmission device is used for carrying out password operation on the first control signal to obtain a second control signal and forwarding the second control signal to the processing unit;
the processing unit is in communication connection with the output unit;
and the processing unit is used for forwarding the second control signal to the output unit.
In one possible design, the password transmission device includes: an operation chip and an interface circuit;
the operation chip is in communication connection with the input unit;
the operation chip is used for encrypting or decrypting the first control signal to obtain a second control signal;
the interface circuit is respectively connected with the operation chip and the processing unit in a communication way;
and the interface circuit is used for forwarding the second control signal to the processing unit.
In one possible design, the password transmission device further includes: an analysis chip;
the analysis chip is respectively connected with the input unit and the operation chip in a communication way;
the analysis chip is used for analyzing the first control signal to obtain an analysis result;
and the analysis chip is also used for forwarding the first control signal to the operation chip when the analysis result is a first result, wherein the first result is used for indicating the first control signal of the password operation.
In one possible design, the analysis chip is in communication with the processing unit;
the analysis chip is also used for transmitting the first control signal to the processing unit when the analysis result is a second result, wherein the second result is used for indicating the transmission of the first control signal;
the processing unit is further used for forwarding the first control signal to the output unit.
In one possible design, the password transmission device further includes: a control chip;
the control chip is in communication connection with the operation chip;
and the control chip is used for starting the operation chip when the analysis result is the first result and stopping the operation chip when the analysis result is the second result.
In one possible design, the programmable logic controller is deployed at the master station;
the input unit is in communication connection with the main control equipment;
the output unit is in communication connection with a programmable logic controller deployed at the slave station;
the operation chip is specifically used for encrypting and operating the first control signal to obtain the second control signal.
In one possible design, the programmable logic controller is deployed at a secondary station;
the input unit is in communication connection with a programmable logic controller arranged at the master station;
the output unit is in communication connection with the controlled equipment;
the operation chip is specifically used for decrypting and operating the first control signal to obtain a second control signal.
In one possible design, the programmable logic controller further includes: the device comprises an indication unit, a storage unit and an expansion unit;
the indicating unit, the storage unit and the expansion unit are respectively in communication connection with the processing unit;
an indication unit for indicating the state of the programmable logic controller;
the memory unit comprises a read-only memory and a random access memory, and the read-only memory and the random access memory are respectively in communication connection with the processing unit;
the expansion unit is communicatively connected to a third party device.
In one possible design, the indication unit comprises: a first display lamp, a second display lamp, and a third display lamp;
the first display lamp, the second display lamp and the third display lamp are respectively in communication connection with the processing unit;
the first display lamp is used for indicating an operation state, and the operation state comprises equipment startup and equipment shutdown;
the second display lamp is used for indicating abnormal states, wherein the abnormal states comprise connection timeout and connection interruption;
and the third display lamp is used for indicating the interface state, and the interface state comprises interface connection and interface disconnection.
In a second aspect, the present application provides a control system comprising: a plurality of programmable logic controllers as in any of the first aspects communicatively coupled to a star topology.
The application provides a programmable logic controller and control system, the programmable logic controller includes: the password transmission device is respectively in communication connection with the input unit and the processing unit, and the processing unit is in communication connection with the output unit. The following technical effects are realized: the first control signal is subjected to password operation through the password transmission device to obtain and transmit the second control signal, so that the problem that the transmission of the control signal faces increasingly frequent network attacks, and the probability of data leakage is greatly improved is solved; the processing unit is used for controlling each unit and each device of the programmable logic controller, so that the problem that each unit and each device of the programmable logic controller are mutually coordinated is solved; the first control signaling is acquired from other PLCs or the master control equipment through the input unit, and the second control signal is sent to other PLCs or the controlled equipment through the output unit, so that the problem that the programmable logic controller transmits the control signal is solved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an application scenario of a programmable logic controller according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a programmable logic controller according to an embodiment of the present application;
fig. 3 is a schematic diagram of a second structure of the programmable logic controller according to the embodiment of the present application;
fig. 4 is a schematic diagram III of a programmable logic controller according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a programmable logic controller according to an embodiment of the present application;
fig. 6 is a schematic diagram of a programmable logic controller according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a programmable logic controller according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram seventh of a programmable logic controller according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a control system according to an embodiment of the present application.
Reference numerals:
100-controlling a computer;
200-a control system; 210-a programmable logic controller; 220-an input unit; 230-a password transmission device; 231-an arithmetic chip; 232-interface circuitry; 233-an analysis chip; 234-control chip; 240-a processing unit; 250-an output unit; 260-an indication unit; 261-a first display lamp; 262-a second display lamp; 263-third display lamp; 270-a memory cell; 280-an expansion unit;
300-automatic guided vehicle; 310-hoisting system; 320-travel system.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and programmable logic controllers consistent with certain aspects of the application as detailed in the accompanying claims.
In the embodiments of the present application, the words "first," "second," and the like are used to distinguish between identical or similar items that have substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ. It should be noted that, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion. In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more.
The term "at … …" in the embodiment of the present application may be instantaneous when a certain situation occurs, or may be a period of time after a certain situation occurs, which is not particularly limited in the embodiment of the present application. Furthermore, the programmable logic controller provided in the embodiments of the present application is merely an example, and the programmable logic controller may further include more or less content.
In order to facilitate the clear description of the technical solutions of the embodiments of the present application, the following simply describes some terms and techniques related to the embodiments of the present application:
cryptographic operations: is a data processing mode. The cryptographic operation includes an encryption operation or a decryption operation.
Encryption operation: is a cryptographic operation. The encryption operation encrypts the original readable plaintext data into unreadable ciphertext data through an encryption algorithm.
Decryption operation: is a cryptographic operation. The decryption operation decrypts the original unreadable ciphertext data into readable plaintext data through a decryption algorithm.
And (3) transmission: is a data processing mode. Transparent transmission, namely data transmission only, does not change or adjust, and all format contents of the data before and after transmission are consistent, so that the integrity of the data is greatly ensured.
Star topology: is a network topology. In a star topology, each network node is connected in a point-to-point fashion to a central node, which transmits information to a destination node.
The PLC is an essential component of the brain of the engineering machinery. In the running process of the engineering mechanical equipment, the PLC makes a decision in real time so as to control an execution device of the engineering mechanical equipment to execute preset work. Specifically, the PLC controls a servo motor (e.g., controlling torque, controlling steering, or controlling rotational speed, etc.) to drive a lower-level external work device (e.g., a robotic arm, a traveling system, or a hydraulic system).
With the rapid development of industrial automation, to realize more complex functions, a master control device is required to simultaneously control a plurality of controlled devices. An effective solution is that a plurality of PLCs constitute a control system, which includes one PLC deployed at a master station, i.e., master station PLC, and a plurality of PLCs deployed at slave stations, i.e., slave station PLCs. The master station PLC simultaneously controls a plurality of slave station PLCs through control signals, and the master control equipment simultaneously controls a plurality of controlled equipment through a control system.
With this, it is becoming increasingly important to ensure the safety and integrity of control signal transmissions. The reason is that, firstly, the core competitiveness and business confidentiality of an enterprise, such as production technology, product design, market strategy and the like, can be resolved through the control signals, and if the data are acquired by unauthorized personnel, the interests and the reputation of the enterprise are seriously damaged; secondly, with the rapid development of wireless connection, the master station PLC and the slave station PLC are in wireless communication connection, and accordingly, the transmission of control signals faces increasingly frequent network attack, so that the probability of data leakage is greatly improved.
Based on the above, the embodiment of the application provides a programmable logic controller and a control system, which can be used in the technical field of programmable logic controllers and aim to solve the problem that the transmission of control signals faces increasingly frequent network attacks, so that the probability of data leakage is greatly improved.
Fig. 1 is an application scenario schematic diagram of a programmable logic controller according to an embodiment of the present application. It should be noted that fig. 1 is only one possible application scenario to help those skilled in the art understand the technical content of the present application, but it does not mean that the embodiments of the present application may not be used for other application scenarios. As shown in fig. 1, the application scenario of the programmable logic controller includes: control computer 100, control system 200, and automated guided vehicle 300. The control system 200 includes: three programmable logic controllers 210, the automated guided vehicle 300 includes: a hoist system 310 and a travel system 320.
The control computer 100 is a master control device. The operator controls the hoist system 310 to drive the automatic guided vehicle 300 to travel and/or controls the traveling system 320 to hoist goods by inputting a command, an imaging operation, or an automated program on the control computer 100. In addition to the examples given in the context of the present application, the master device may also be a desktop computer, a smart phone, a control server or an operating console.
The first programmable logic controller 210 is a master station programmable logic controller. The first programmable logic controller 210 is communicatively coupled to the control computer 100, and is wirelessly communicatively coupled to the second programmable logic controller 210 and the third programmable logic controller 210, respectively, and the communication connection may include various connection types, such as a wired, wireless communication link, or fiber optic cable, etc. The first programmable logic controller 210 may be deployed on the control computer 100, on the automated guided vehicle 300, or at other locations. The first programmable logic controller 210 is configured to forward the control signal sent by the control computer 100 to the second programmable logic controller 210 or the third programmable logic controller 210, for example, forward the control signal for controlling the hoisting system 310 to the second programmable logic controller 210, so that the control signal is forwarded to the hoisting system 310; for another example, control signals that control the travel system 320 are forwarded to the third programmable logic controller 210 to facilitate the forwarding of the control signals to the travel system 320.
The second programmable logic controller 210 is a slave programmable logic controller. The second programmable logic controller 210 is communicatively coupled to the hoist system 310. The second programmable logic controller 210 may be deployed on the hoist system 310, on the automated guided vehicle 300, or at other locations. The second programmable logic controller 210 is used to forward control signals to the hoist system 310.
The third programmable logic controller 210 is a slave programmable logic controller. The third programmable logic controller 210 is communicatively coupled to a travel system 320. The third programmable logic controller 210 may be deployed on the travel system 320, on the automated guided vehicle 300, or at other locations. The third programmable logic controller 210 is used to forward control signals to the travel system 320.
The automated guided vehicle 300 is a controlled device. The automatic guided vehicle 300 is used for lifting and carrying goods and transporting the goods from the place to the designated place. The hoisting system 310 is specifically configured to output different torques, rotational speeds and steering directions according to the control signals, so as to drive the automatic guided vehicle 300 to advance, retreat or steer. The traveling system 320 is specifically configured to hoist the cargo from the vehicle to the vehicle or hoist the cargo from the vehicle to the vehicle according to the control signal. In addition to the example of the application field Jing Geichu, the controlled device may also be other engineering machinery devices, such as inspection equipment, hoisting machinery, or a line production line, etc. The engineering mechanical equipment is provided with a plurality of driving systems, and each slave programmable logic controller is used for controlling a plurality of driving systems respectively.
Fig. 2 is a schematic diagram of a programmable logic controller according to an embodiment of the present application. As shown in fig. 2, the programmable logic controller 210 includes: an input unit 220, a password transmission device 230, a processing unit 240, and an output unit 250;
the password transmission device 230 is respectively in communication connection with the input unit 220 and the processing unit 240;
specifically, the input unit 220 is a transmission interface, and different types of access devices access the input unit 220, wherein other PLCs (when the programmable logic controller 210 is a master programmable logic controller, the other PLCs are slave programmable logic controllers, and when the programmable logic controller 210 is a slave programmable logic controller, the other PLCs are master programmable logic controllers) access the input unit 220 through a wireless communication connection, and the master device accesses the input unit 220 through a wired communication connection or a wireless communication connection; the wireless communication connection may be a fifth generation mobile communication technology (5th Generation Mobile Communication Technology,5G), long Range Radio (LoRa), or wireless network communication technology (WIreless Fidelity, wiFi), etc.; the wired communication connection may be a controller area network (Controller Area Network, CAN) bus, universal serial (Universal Serial Bus, USB) bus, or a network cable, etc. The input unit 220 is configured to acquire a first control signal, and may acquire the first control signal from another PLC, or may acquire the first control signal from a master control device.
The password transmission device 230 is a device that processes data. The password transmission device 230 is communicatively connected to the input unit 220, and the password transmission device 230 is configured to perform a password operation on the first control signal to obtain a second control signal, and forward the second control signal to the processing unit 240. Wherein the cryptographic operation is an encryption operation or a decryption operation; the password transmission device 230 is communicatively connected to the processing unit 240, and the password transmission device 230 sends a second control signal to the processing unit 240.
The processing unit 240 is communicatively connected to the output unit 250;
specifically, the processing unit 240 is a chip that computes data. The password transmission device 230 may be a central processing unit (Central Processing Unit, CPU), a micro control unit (Microcontroller Unit, MCU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or a field programmable gate array (Field Programmable Gate Array, FPGA), or the like. The processing unit 240 is communicatively connected to the output unit 250, and the processing unit 240 is configured to forward the second control signal to the output unit 250.
The processing unit 240 controls each unit and device in the programmable logic controller 210, the processing unit 240 is further configured to control the input unit 220 to obtain a first control signal from other PLCs or a master control device, control the password transmission device 230 to obtain a second control signal according to the first control signal, and control the output unit 250 to send the second control signal to the other PLCs or the controlled device.
The output unit 250 is a transmission interface, and the output unit 250 accesses different types of access devices. The output unit 250 is connected to other PLCs by a wireless communication connection, and is connected to the controlled device by a wired communication connection or a wireless communication connection. The output unit 250 transmits the second control signal to other PLCs or controlled devices so as to control the controlled devices to perform a preset action according to the second control signal.
The programmable logic controller provided in this embodiment includes: the password transmission device is respectively in communication connection with the input unit and the processing unit, and the processing unit is in communication connection with the output unit. The following technical effects are realized: the first control signal is subjected to password operation through the password transmission device to obtain and transmit the second control signal, so that the problem that the transmission of the control signal faces increasingly frequent network attacks, and the probability of data leakage is greatly improved is solved; the processing unit is used for controlling each unit and each device of the programmable logic controller, so that the problem that each unit and each device of the programmable logic controller are mutually coordinated is solved; the first control signaling is acquired from other PLCs or the master control equipment through the input unit, and the second control signal is sent to other PLCs or the controlled equipment through the output unit, so that the problem that the programmable logic controller transmits the control signal is solved.
Fig. 3 is a schematic diagram of a second structure of the programmable logic controller according to the embodiment of the present application. Fig. 3 illustrates the password transmission device 230 in detail based on fig. 2. As shown in fig. 3, the password transmission device 230 includes: an arithmetic chip 231 and an interface circuit 232;
the operation chip 231 is connected with the input unit 220 in communication;
the interface circuit 232 is respectively connected with the operation chip 231 and the processing unit 240 in a communication manner;
specifically, the operation chip 231 is a chip dedicated to realizing data encryption and decryption. The operation chip 231 may be an ATSHA204A chip, a PN7462 chip, or another encryption chip. The operation chip 231 supports various algorithms and protocols, and realizes an encryption algorithm or a decryption algorithm through hardware support so as to realize safer and more efficient encryption operation or decryption operation. The operation chip 231 is used for encrypting or decrypting the first control signal to obtain the second control signal.
The interface circuit 232 is a circuit that functions as a connection, and the interface circuit 232 is configured to forward the second control signal to the processing unit 240. The interface circuit 232 includes a serial peripheral (Serial Peripheral Interface, SPI) interface connected in series, a logic level conversion device, a filtering/isolation device, the SPI interface being communicatively coupled to the arithmetic chip 231, the filtering/isolation device being communicatively coupled to the processing unit 240.
The SPI interface is used for data communication between a master device (e.g., the computing chip 231) and a slave device (e.g., the processing unit 240), and is a synchronous, full duplex communication protocol.
The logic level conversion device is used for converting the logic level of the operation chip 231 into the logic level of the processing unit 240. When the arithmetic chip 231 and the processing unit 240 use different logic levels, the logic level conversion means ensures compatibility of both signals. The logic level conversion device is a mature circuit structure and is composed of electronic elements such as a transistor, a level shifter, a level comparator and the like, and the conversion of the logic level is realized by adopting a level shifting or level comparison mode.
The filtering/isolating device is used for reducing electromagnetic interference and isolating interference among different parts, so that the reliability and stability of communication are improved, and the filtering/isolating device is a circuit component commonly used in an electronic system. The filtering/isolating device comprises a filtering device and an isolating device, wherein the filtering device is generally composed of elements such as a capacitor, an inductor, a resistor and the like and is used for filtering high-frequency noise, interference and harmonic waves in a control signal so as to keep the definition of the control signal; the isolation device is used to isolate the interference between the operation chip 231 and the processing unit 240 to prevent the interference signal from affecting other devices and units.
In one possible design, fig. 4 is a schematic diagram of a programmable logic controller according to an embodiment of the present application. Fig. 4 is a detailed description of the password transmission device 230 based on fig. 3. As shown in fig. 4, the password transmission device 230 further includes: an analysis chip 233;
the analysis chip 233 is communicatively connected to the input unit 220 and the operation chip 231, respectively;
specifically, analysis chip 233 is a circuit that analyzes and forwards data. The analysis chip 233 may be CPU, MCU, ASIC, FPGA, or the like. The analysis chip 233 determines whether to perform encryption or decryption on the first control signal according to a predetermined rule and policy. For example, analysis chip 233 monitors the security and sensitivity of the first control signal in real time, identifying potential threats therein to ensure the security and integrity of the control signal during transmission and storage. The analysis chip 233 is used for analyzing the first control signal to obtain an analysis result; when the analysis result is the first result, the first control signal is forwarded to the operation chip 231, so that the operation chip 231 performs the cryptographic operation on the first control signal, a second control signal is obtained, and the second control signal is forwarded to the output unit 250 through the processing unit 240, where the first result is used to indicate that the cryptographic operation is performed on the first control signal.
In one possible design, fig. 5 is a schematic diagram of a programmable logic controller according to an embodiment of the present application. Fig. 5 is a detailed description of the password transmission device 230 based on fig. 4. As shown in fig. 5, analysis chip 233 is communicatively coupled to processing unit 240;
specifically, when the analysis result is a second result, the first control signal is forwarded to the processing unit 240, so that the processing unit 240 forwards the first control signal to the output unit 250, where the second result is used to indicate that the first control signal is transmitted through.
In one possible design, fig. 6 is a schematic diagram of a programmable logic controller according to an embodiment of the present application. Fig. 6 is a detailed description of the password transmission device 230 based on fig. 5. As shown in fig. 6, the password transmission device 230 further includes: a control chip 234;
the control chip 234 is in communication connection with the operation chip 231;
specifically, the control chip 234 is a chip dedicated to control the operation chip 231. The control chip 234 may be an a71 CH-series chip, an OPTIGA Trust-series chip, or an ataecc 608A-series chip. The control chip 234 is used for controlling the functions of the operation chip 231, such as start-stop and parameter setting, and is an important component in the password transmission device 230, and specifically is used for: firstly, the operation chip 231 is started when the analysis result is the first result, and the operation chip 231 is stopped when the analysis result is the second result, so that the operation chip 231 is ensured to operate only when needed, and the system resource of the programmable logic controller 210 is saved; secondly, the control operation chip 231 selects different algorithms and protocols, and configures configuration parameters of the operation chip 231, so as to ensure that the operation chip 231 can perform encryption operation or decryption operation; third, the state of the password transmission device 230 is monitored, including the power state, the encryption state, the error state, etc., so as to ensure the normal operation of the password transmission device 230; fourth, the respective chips and the power of the password transmission device 230 are controlled and managed.
In one possible design, programmable logic controller 210 is deployed at a master station;
the input unit 220 is in communication connection with the master control device;
the output unit 250 is communicatively connected to a programmable logic controller disposed at the slave station;
specifically, when the programmable logic controller 210 is deployed at the master station, it is the master station programmable logic controller. The input unit 220 obtains a first control signal from a master control device (e.g., the control computer 100 in fig. 1), where the first control signal is readable plaintext data; the operation chip 231 encrypts and operates the first control signal to obtain a second control signal, wherein the second control signal is unreadable dark text data; the output unit 250 transmits the second control signal to the slave programmable logic controller.
In one possible design, programmable logic controller 210 is deployed at a slave station;
the input unit 220 is in communication connection with the programmable logic controller 210 deployed at the master station;
the output unit 250 is in communication connection with the controlled device;
specifically, the programmable logic controller 210 is a slave programmable logic controller when deployed at the slave. The input unit 220 obtains a first control signal from the master station programmable logic controller, wherein the first control signal is unreadable dark text data; the operation chip 231 decrypts and operates the first control signal to obtain a second control signal, wherein the second control signal is readable plaintext data; the output unit 250 transmits the second control signal to the controlled device (e.g., the hoist system 310 or the traveling system 320 of fig. 1).
In one possible design, fig. 7 is a schematic diagram of a programmable logic controller according to an embodiment of the present application. Fig. 7 is a detailed description of the programmable logic controller 210 based on fig. 6. As shown in fig. 7, the programmable logic controller 210 further includes: an instruction unit 260, a storage unit 270, and an expansion unit 280;
the indication unit 260, the storage unit 270 and the expansion unit 280 are respectively communicatively connected with the processing unit 240;
the memory unit 270 includes a read-only memory and a random access memory, which are respectively communicatively connected to the processing unit 240;
the expansion unit 280 is in communication connection with a third party device;
specifically, the indication unit 260 is a device for prompting the outside. The indication unit 260 may be an optical device, for example, by a display lamp for prompting; or may be an acoustic device, for example, by a horn; other devices not listed are also possible. The indication unit 260 is used for indicating the state of the programmable logic controller 210, the state of the programmable logic controller 210 is determined by the processing unit 240, and the processing unit 240 controls the indication unit 260 to prompt.
The storage unit 270 is a device that stores data. The storage unit 270 includes a Read-Only Memory (ROM) and a random access Memory (Random Access Memory, RAM). ROM works in a nondestructive read-out mode, only information which cannot be written in can be read out, the information is fixed once written in, even if the power supply is cut off, the information cannot be lost, the system degree of PLC and the user program are stored in the ROM, and the system program and the user program can be stored in one partition or can be stored in different partitions separately. The RAM can read and write at any time and has high speed, and when the RAM works, information can be written in (stored in) or read out (taken out) from any appointed address at any time, and the greatest difference between the RAM and the ROM is the volatility of data, namely, once the power is cut off, the stored data is lost, and temporary data and intermediate results are stored in the RAM.
The extension unit 280 is a transmission interface, and different types of third party devices access the extension unit 280. The third party device may be an external device such as a monitor or a printer, which makes the configuration of the programmable logic controller 210 more flexible to meet the needs of different control systems and operators.
In other embodiments, the programmable logic controller 210 further comprises: and the power supply device is used for converting 220V alternating current into direct current which is available for each unit and device and supplying power for each unit and device.
In one possible design, fig. 8 is a schematic diagram of a programmable logic controller according to an embodiment of the present application. Fig. 8 is a detailed description of the instruction unit 260 based on fig. 7. As shown in fig. 3, the indicating unit 260 includes: a first display lamp 261, a second display lamp 262, and a third display lamp 263;
the first display lamp 261, the second display lamp 262 and the third display lamp 263 are respectively in communication connection with the processing unit 240;
specifically, the first display lamp 261, the second display lamp 262, and the third display lamp 263 may be light emitting diodes (Light Emitting Diode, LEDs), or filament indication lamps, which indicate different contents by different colors or different flicker ratings.
The first display lamp 261 is used for indicating an operation state, and the operation state comprises equipment startup and equipment shutdown; for example, when the first display lamp 261 is green and normally on, the programmable logic controller 210 is indicated to be in an operating state in which the device is turned on; when the first display lamp 261 is normally on in blue, the programmable logic controller 210 is indicated to be in an operating state in which the device is turned off.
The second display lamp 262 is used for indicating abnormal states, and the abnormal states comprise connection timeout and connection interruption; for example, when the second display lamp 262 is normally on in green, it indicates that the programmable logic controller 210 is not in an abnormal state; when the second display lamp 262 is normally bright in yellow, the programmable logic controller 210 is indicated to be in an abnormal state of connection timeout, and the abnormal state of connection timeout refers to connection timeout between the programmable logic controller 210 and the master control device, the master station programmable logic controller, the slave station programmable logic controller or the controlled device; when the second display lamp 262 flashes yellow, the programmable logic controller 210 is indicated to be in an abnormal state of connection interruption, and the abnormal state of connection interruption refers to connection interruption between the programmable logic controller 210 and the master control device, the master station programmable logic controller, the slave station programmable logic controller or the controlled device, or a plurality of devices or units in the programmable logic controller 210 have faults, and the faults are software faults and/or hardware faults.
The third display lamp 263 is used for indicating the interface state, and the interface state comprises interface connection and interface disconnection; for example, when the third display lamp 263 is normally on in green, the interface connection of the input unit 220 and the output unit 250 is instructed; when the third display lamp 263 is normally lighted in yellow, it indicates that the input unit 220 and/or the output unit 250 are being plugged in and out.
The programmable logic controller provided in this embodiment includes: the password transmission device is respectively in communication connection with the input unit and the processing unit, and the processing unit is in communication connection with the output unit. The following technical effects are realized: the first control signal is subjected to password operation through the password transmission device to obtain and transmit the second control signal, so that the problem that the transmission of the control signal faces increasingly frequent network attacks, and the probability of data leakage is greatly improved is solved; the processing unit is used for controlling each unit and each device of the programmable logic controller, so that the problem that each unit and each device of the programmable logic controller are mutually coordinated is solved; the first control signaling is acquired from other PLCs or master control equipment through the input unit, and the second control signal is sent to other PLCs or controlled equipment through the output unit, so that the problem of control signal transmission of the programmable logic controller is solved; the first control signal is subjected to password operation or transmitted through the operation chip, the interface circuit, the analysis chip and the control chip, so that the problem of different requirements on the safety and the sensitivity of the first control signal is solved; the running state, the abnormal state and the interface state of the programmable logic controller are indicated by the indicator lamp, so that the problem that an operator cannot know the state of the programmable logic controller in time is solved.
Fig. 9 is a schematic structural diagram of a control system according to an embodiment of the present application. As shown in fig. 9, the control system 200 includes: the star topology is communicatively coupled to the programmable logic controller 210 of a plurality of the above-described embodiments.
The control system provided in this embodiment has similar implementation principles and technical effects to those of a programmable logic controller in the above embodiment, and this embodiment is not described herein again.
While the present application has been described in connection with the preferred embodiments illustrated in the accompanying drawings, it will be readily understood by those skilled in the art that the scope of the application is not limited to such specific embodiments, and the above examples are intended to illustrate the technical aspects of the application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A programmable logic controller, the programmable logic controller comprising: the device comprises an input unit, a password transmission device, a processing unit and an output unit;
the password transmission device is respectively in communication connection with the input unit and the processing unit;
the input unit is used for acquiring a first control signal;
the password transmission device is used for carrying out password operation on the first control signal to obtain a second control signal and forwarding the second control signal to the processing unit;
the processing unit is in communication connection with the output unit;
the processing unit is configured to forward the second control signal to the output unit.
2. The programmable logic controller according to claim 1, wherein the password transmission means comprises: an operation chip and an interface circuit;
the operation chip is in communication connection with the input unit;
the operation chip is used for carrying out encryption operation or decryption operation on the first control signal to obtain a second control signal;
the interface circuit is respectively in communication connection with the operation chip and the processing unit;
the interface circuit is used for forwarding the second control signal to the processing unit.
3. The programmable logic controller of claim 2, wherein the password transmission device further comprises: an analysis chip;
the analysis chip is respectively in communication connection with the input unit and the operation chip;
the analysis chip is used for analyzing the first control signal to obtain an analysis result;
the analysis chip is further configured to forward the first control signal to the operation chip when the analysis result is a first result, where the first result is used to indicate a password to operate the first control signal.
4. A programmable logic controller according to claim 3, wherein the analysis chip is communicatively connected to the processing unit;
the analysis chip is further configured to transparently transmit the first control signal to the processing unit when the analysis result is a second result, where the second result is used to indicate that the first control signal is transparently transmitted;
the processing unit is further configured to forward the first control signal to the output unit.
5. The programmable logic controller of claim 4, wherein the password transmission device further comprises: a control chip;
the control chip is in communication connection with the operation chip;
the control chip is used for starting the operation chip when the analysis result is a first result, and stopping the operation chip when the analysis result is a second result.
6. The programmable logic controller of claim 5, wherein the programmable logic controller is deployed at a master station;
the input unit is in communication connection with the main control equipment;
the output unit is in communication connection with a programmable logic controller deployed at the slave station;
the operation chip is specifically configured to encrypt the first control signal to obtain the second control signal.
7. The programmable logic controller of claim 5, wherein the programmable logic controller is deployed at a slave station;
the input unit is in communication connection with a programmable logic controller arranged at the master station;
the output unit is in communication connection with the controlled equipment;
the operation chip is specifically configured to decrypt and operate the first control signal to obtain the second control signal.
8. The programmable logic controller according to claim 6 or 7, further comprising: the device comprises an indication unit, a storage unit and an expansion unit;
the indicating unit, the storage unit and the expansion unit are respectively in communication connection with the processing unit;
the indicating unit is used for indicating the state of the programmable logic controller;
the storage unit comprises a read-only memory and a random access memory, and the read-only memory and the random access memory are respectively in communication connection with the processing unit;
the expansion unit is in communication connection with a third party device.
9. The programmable logic controller of claim 8, wherein the indication unit comprises: a first display lamp, a second display lamp, and a third display lamp;
the first display lamp, the second display lamp and the third display lamp are respectively in communication connection with the processing unit;
the first display lamp is used for indicating an operation state, and the operation state comprises equipment startup and equipment shutdown;
the second display lamp is used for indicating abnormal states, and the abnormal states comprise connection timeout and connection interruption;
the third display lamp is used for indicating interface states, and the interface states comprise interface connection and interface disconnection.
10. A control system, the system comprising: a plurality of programmable logic controllers as claimed in any one of claims 1 to 9 communicatively coupled to a star topology.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322351524.2U CN220232289U (en) | 2023-08-30 | 2023-08-30 | Programmable logic controller and control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322351524.2U CN220232289U (en) | 2023-08-30 | 2023-08-30 | Programmable logic controller and control system |
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