CN117061593A - Manufacturing system-oriented low-delay data interaction industrial Internet of things architecture method - Google Patents
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Abstract
The invention discloses a manufacturing system-oriented low-delay data interaction industrial Internet of things architecture method, which comprises the following steps of S1, combining an operation technology OT and an information technology IT, and collecting real-time data and historical data of facilities in a manufacturing system; s2, constructing a server through the collected data, deploying an edge gateway according to the constructed server by using an OPC UA server, and shielding the isomerism of a data format and a protocol for interactive operation; s3, using a time-sensitive software-defined network switch, and carrying out deterministic delay and reliability detection on data transmission; s4, an intelligent factory testing platform is constructed, and the OPC UA information model and the collected data are transmitted through the intelligent factory testing platform. The invention provides a three-layer industrial Internet of things system structure oriented to a manufacturing system, and an edge gateway based on OPC UA shields the isomerism of a communication protocol and a data format, thereby improving the time delay and the reliability of data transmission.
Description
Technical Field
The invention relates to the field of industrial Internet of things, in particular to a manufacturing system-oriented low-delay data interaction industrial Internet of things architecture method.
Background
With the development of industrial internet of things, many manufacturing devices and various sensors are connected together through different industrial communication protocols, but by developing the industrial internet of things, a manufacturing system can provide intelligent decisions, so that the efficiency of industrial field work can be remarkably improved, and a traditional manufacturing system is converted into an intelligent factory, and the traditional industrial internet of things system pyramid architecture comprises five layers, from bottom to top, including workshops, programmable logic controllers, monitoring and data acquisition, manufacturing execution systems and enterprise resource planning, the lower layers of the operation technology network require low delay, low jitter, reliability and synchronization, and depend on the industrial communication network protocols, wherein the upper layers apply standard information technology based on internet protocol communication, but due to different industrial requirements of the operation technology and the information technology, the two layers adopt heterogeneous communication protocols and data formats, not only physical separation is caused, but also separation is caused on data, so that how to combine the production operation technology and the information technology, improve the internal operation efficiency of the factory, and reduce labor cost is an urgent problem to be solved.
Since OT networks contain a variety of industrial communication protocols, such as ethernet, fieldbus and industrial wireless networks, fusing heterogeneous communication protocols to achieve free data flow over the same network is an open problem, on the other hand, deploying a large number of vendor-specific devices on a manufacturing line, creating a large number of heterogeneous data with formats and dimensions, makes it a challenging problem how to build a unified semantic digital model of heterogeneous data from vendor-specific devices, and at the same time, the low latency and reliability requirements of the OT layer for data transmission also present design challenges.
The existing emerging technologies aim at solving the problems, a set of standards are defined by a time-sensitive network to provide real-time communication and ensure high-quality transmission of a plurality of data streams in the same network, a meta-heuristic algorithm based on tabu search is proposed by the academy to support a plurality of traffic types, deterministic real-time capability is brought to the time-sensitive network, and the OPC unified architecture can realize flexible communication among various data sources in an industrial control environment as an effective open standard for data access and communication.
However, conventional equipment processes used in manufacturing do not support OPC UA, and manufacturers have to replace conventional equipment to increase production, which results in expensive costs. To overcome these bottlenecks, the present patent uses the emerging technology time-sensitive networks and OPC UA to enable real-time transmission and interoperation of data throughout an industrial system. In addition, in order to achieve a flexible network architecture, a software-defined network is employed to logically manage centralized network resources and rapidly configure industrial facilities.
For the problems in the related art, no effective solution has been proposed at present.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a manufacturing system-oriented low-delay data interaction industrial Internet of things architecture method, which aims to overcome the technical problems in the prior art.
For this purpose, the invention adopts the following specific technical scheme:
a manufacturing system oriented low latency data interaction industrial internet of things architecture method, the method comprising:
s1, collecting real-time data and historical data of facilities in a manufacturing system by combining an operation technology OT and an information technology IT;
s2, constructing a server through the collected data, deploying an edge gateway according to the constructed server by using an OPC UA server, shielding the isomerism of a data format and a protocol, and enabling the devices to communicate with each other;
s3, using a time-sensitive software-defined network switch, and carrying out deterministic delay and reliability detection on data transmission;
s4, an intelligent factory testing platform is constructed, and the OPC UA information model and the collected data are transmitted through the intelligent factory testing platform.
Further, for the purpose of constructing a server by the collected data, and deploying an edge gateway according to the constructed server by using an OPC UA server, the step of shielding the data format and the heterogeneity of the protocol for interactive operation comprises the following steps:
s21, combining a time sensitive network TSN and a software defined network SDN, and a time sensitive software defined network architecture;
s22, an OPC UA is adopted as an IEC standardized industrial communication protocol, a platform-independent service-oriented architecture is constructed, and raw data of workshops to production plans are exchanged.
Further, for the purpose of combining the time sensitive network TSN and the software defined network SDN, the time sensitive software defined network architecture comprises the following steps:
defining network construction to adopt a TSSDN switch to carry out architecture, wherein the TSSDN switch comprises a TSN and an SDN switch component, and the TSSDN architecture defined by the TSSDN switch comprises a centralized user configuration composition controller, a centralized network configuration controller, the TSN switch, the SDN switch and the TSSDN switch.
Further, for the purpose of adopting OPC UA as an IEC standardized industrial communication protocol, and constructing a platform-independent service-oriented architecture, and exchanging raw data from the shop to the production plan, the method comprises the following steps:
s221, constructing a three-layer industrial Internet of things system architecture by adopting a field device layer, a network access layer and an enterprise network layer;
s222, carrying out heterogeneous industrial communication protocol on equipment through a field equipment layer to send real-time data;
s223, receiving data through an edge gateway and establishing connection with the highest two layers based on an OPC UA communication protocol;
s224, receiving and transmitting real-time data from a field device layer gateway through a network access layer, and receiving time sensitive or time insensitive data;
s225, monitoring and deciding production line data through the top enterprise network layer.
Further, for the purpose of the heterogeneous industrial communication protocol transmission of real-time data to the device through the field device layer, the method comprises the following steps:
the heterogeneous industrial communication protocol includes serial port protocol, network protocol, sensor network protocol and wireless communication protocol, and exchanges and shares data between the device and the network through the heterogeneous industrial communication protocol.
Further, for the purpose of receiving data through the edge gateway and establishing a connection with the highest two layers based on OPC UA communication protocol, the method comprises the following steps:
s2231, deploying an edge gateway on a field device layer, and taking the edge gateway as a bridge between field devices and a network access layer;
s2232, the edge gateway is provided with a physical interface module supporting various industrial communication protocols, uses the communication protocol of the edge gateway to transmit real-time data on a production line, and is connected with heterogeneous field devices through the physical interface module;
s2233, reporting the real-time data to the gateway, calling a protocol analysis module to analyze the protocol, and providing access to the field heterogeneous device through the edge gateway by shielding the isomerism of the communication protocol.
Further, for the purpose of receiving and transmitting real-time data from the field device layer gateway through the network access layer, receiving time sensitive or time insensitive data comprises the following steps:
s2241, collecting, analyzing and applying the received time sensitive data, and making a decision;
s2242, the received time insensitive data is stored for a long time, analyzed, and analyzed according to the historical trend and development rule.
The beneficial effects of the invention are as follows:
1. the invention provides a three-layer industrial Internet of things system structure oriented to a manufacturing system, which realizes conversion from a traditional automation system to a network physical system, combines an OPC UA-based edge gateway with a TSSDN switch, shields the isomerism of a communication protocol and a data format by the OPC UA-based edge gateway, and improves the time delay and the reliability of data transmission by the TSSDN switch.
2. According to the invention, interactive operation of heterogeneous equipment is realized through OPC UA, TSSDN realizes centralized control of network resources and flexible configuration of a real-time industrial network, and the applicability of the proposed system architecture is evaluated through an intelligent factory test bed, so that information model and data transmission based on OPC UA are realized, communication between an OPC UA server and a client based on TCP or IP is realized, and the communication comprises reading and writing of equipment variable real-time values and calling of equipment operation methods.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a method flow diagram of a manufacturing system oriented low latency data interaction industrial Internet of things architecture method in accordance with an embodiment of the present invention
FIG. 2 is one of the construction schematics of a server in a manufacturing system oriented low latency data interaction industrial Internet of things architecture method according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of the construction of a server in a method for architecture of a low-latency data interaction industrial Internet of things for a manufacturing system according to an embodiment of the present invention;
fig. 4 is a third schematic diagram of the construction of a server in a method for constructing a low-latency data interaction industrial internet of things architecture for a manufacturing system according to an embodiment of the present invention.
Detailed Description
For the purpose of further illustrating the various embodiments, the present invention provides the accompanying drawings, which are a part of the disclosure of the present invention, and which are mainly used to illustrate the embodiments and, together with the description, serve to explain the principles of the embodiments, and with reference to these descriptions, one skilled in the art will recognize other possible implementations and advantages of the present invention, wherein elements are not drawn to scale, and like reference numerals are generally used to designate like elements.
According to the embodiment of the invention, a manufacturing system-oriented low-delay data interaction industrial Internet of things architecture method is provided.
The invention will be further described with reference to the accompanying drawings and detailed description, as shown in fig. 1 to 4, a method for constructing a low-latency data interaction industrial internet of things for a manufacturing system according to an embodiment of the invention, the method comprising:
s1, collecting real-time data and historical data of facilities in a manufacturing system by combining an operation technology OT and an information technology IT;
specifically, OT, i.e., the operation technology (Operation Technology), is a professional technology for supporting an automation control system by an automation control system operator in a factory to ensure normal production, and IT, i.e., the information technology (Information Technology), is a generic term for various technologies mainly used for managing and processing information, and mainly applies computer science and communication technologies to design, develop, install and implement information systems and application software.
S2, constructing a server through the collected data, deploying an edge gateway according to the constructed server by using an OPC UA server, shielding the isomerism of a data format and a protocol, and enabling the devices to communicate with each other;
the edge gateway is a device located at the edge of the internet of things, the internet of things device and the cloud are connected, meanwhile, the edge gateway has the isomerism of shielding data formats and protocols, so that different internet of things devices can exchange data and communicate through the edge gateway, in the internet of things, different devices can use different data formats and communication protocols, the isomerism can cause difficulty in mutual communication between the internet of things devices, the data in different formats are converted into a unified format through the edge gateway, and meanwhile, multiple communication protocols are supported, so that mutual communication between different devices can be achieved.
Specifically, the constructing a server by the collected data, deploying an edge gateway by using an OPC UA server in the constructed server, and shielding the isomerism of a data format and a protocol for interactive operation comprises the following steps:
s21, combining a time sensitive network TSN and a software defined network SDN, and a time sensitive software defined network architecture;
specifically, the combination of the time sensitive network TSN and the software defined network SDN with the time sensitive software defined network architecture can ensure deterministic delay of data transmission and provide flexible network resource allocation, while the time sensitive network is proposed by the IEEE working group, and the TSN provides deterministic service through the IEEE802 network;
the time sensitive network has four main components, namely time synchronization, reliability, delay and resource management, the time synchronization is one of key characteristics for guaranteeing synchronization requirements in the time sensitive network and the IEEE802.1AS, the IEEE802.1AS prescribes a universal accurate time protocol, the super reliability is defined by frame replication and elimination supporting seamless data redundancy, frame preemption and enhancement to preset traffic are accompanied by limited low delay, and finally, the resource management is finished by means of standards such as a stream reservation protocol and time sensitive network configuration;
defining network construction employs a TSSDN switch to build a fabric, and the TSSDN switch includes components of TSNs and SDN switches, the TSSDN fabric defined by the TSSDN switch includes a centralized user configuration composition controller (CUC, centralized User Configuration), a centralized network configuration controller (CNC, centralized Network Configuration), and TSN switches, SDN switches, and TSSDN switches.
From a logic perspective, the three components are respectively located in an application layer, a control layer and a data layer, and are similar to an SDN architecture, when a new data flow exists in a network, the CUC informs a user of the CNC through an open northbound interface, the CNC performs corresponding calculation and obtains network configuration parameters based on the obtained information, so that the configuration parameters are transmitted to a switch in the network through a southbound interface, and finally, the switch uses corresponding strategies when forwarding the data frame according to the received configuration information;
the OPC unified architecture (OPC UA, OLE for Process Control Unified Architectur) is a communication protocol of cross-platform, cross-network and cross-manufacturer for realizing data exchange and communication between devices in industrial automation and internet of things applications, and OPC UA is a next generation standard of OPC (Open Platform Communications), which can not only solve the limitation of the conventional OPC, but also has higher security and reliability.
S22, an OPC UA is adopted as an IEC standardized industrial communication protocol, a platform-independent service-oriented architecture is constructed, and raw data of workshops to production plans are exchanged.
Specifically, the architecture of the platform-independent service-oriented architecture is a network architecture in a self-defense network, network control and forwarding are separated, the network architecture can be directly programmed, and an enterprise can obtain the control of the whole network which is independent of a provider from a single logic point by means of the self-defense network, so that the network design and operation are greatly simplified;
the self-defense network architecture comprises three logical planes, namely an application layer, a control layer and a data layer, in particular, the application plane comprises one or more applications, each application has exclusive control over a set of resources exhibited by one or more self-defense network controllers, while the control plane and the application plane are connected using a northbound interface, the self-defense network controllers in the control plane maintain a global view of the network, and directly control states in data plane elements through a southbound interface;
the network architecture consists of an address space and an information model, wherein the address space and the information model of OPC UA are two basic components, and an information set (i.e., address space) is visible to a client in an OPC UA server, and contains an object set and related information;
the OPC UA information model of the OPC UA address space defines variables and methods contained in the object, names nodes, wherein the variables are used for representing values, the method is called by a client and completed on a server, a result is returned to the client, and the result is described by attributes through each node and interconnected through reference so as to traverse the nodes, so that a full-network of the nodes is formed;
the OPC UA server discloses data contained in the information model in different formats, the OPC UA client establishes TCP or IP connection with the OPC UA server, and uses different service access information models, on the other hand, OPC UA can improve delay of exchanging data by using a publishing or subscribing function based on connectionless communication mechanism, a publisher publishes a message of a specific topic, a subscriber receives a message of a topic of interest, and a publishing or subscribing specification contains four protocols for publishing data: proxy-based AMQP (The Advanced Message Queuing Protocol), MQTT (Message Queuing Telemetry Transport) and proxy-less based OPC UA UDP (User Datagram Protocol), OPC UA Ethernet, whereas OPC UA Ethernet uses Ethernet-based protocols, without IP or UDP headers. It uses UA datagram protocol (UADP) message mapping as coding and data link layer for communication, and can be used in conjunction with TSN
Specifically, the method adopts OPC UA as an IEC standardized industrial communication protocol, constructs a platform-independent service-oriented architecture, and exchanges raw data from a workshop to a production plan, comprising the following steps:
s221, constructing a three-layer industrial Internet of things system architecture by adopting a field device layer, a network access layer and an enterprise network layer;
s222, carrying out heterogeneous industrial communication protocol on equipment through a field equipment layer to send real-time data;
s223, receiving the data through an edge gateway and establishing connection with the highest two layers based on an OPC UA communication protocol;
specifically, the field device layer represents physical devices in the industrial field and mainly consists of different devices, since the TSSDN switch comprises components of the TSN and SDN switches, only the structure of the TSSDN switch will be discussed later, such as a sensor, an actuator, a controller and the like, the sensor monitors the state of the devices and sends sensed data to the controller, the controller analyzes the data and sends control commands to the actuator, the actuator executes corresponding actions, and the sensors, the actuators and the controllers of different manufacturers generate a large amount of heterogeneous data with different formats and dimensions, so that the interaction is difficult to realize, and meanwhile, the vendor-specific devices generally use various industrial communication protocols, such as industrial ethernet, field bus and industrial wireless network protocols, and the protocols have different physical interfaces of communication protocols;
the heterogeneous communication protocol refers to different protocols adopted when different types of communication devices or networks communicate, and because of different factors such as communication modes, rates, data formats and the like between the different devices or networks, different communication protocols are required to be used for realizing data transmission and exchange, and in the scheme, the heterogeneous communication protocol comprises the following serial port protocols: is suitable for serial communication, uses RS232 protocol, network protocol: the method is suitable for network communication, uses TCP/IP protocol, and uses sensor network protocol: the method is suitable for sensor network communication, enables the ZigBee protocol and the wireless communication protocol to be as follows: the method is suitable for wireless communication, wi-Fi protocol is used, and data exchange and sharing among different devices or networks can be realized by using heterogeneous communication protocol, so that the expandability and flexibility of the system are improved.
S224, receiving and transmitting real-time data from a field device layer gateway through a network access layer; and receiving time sensitive or time insensitive data;
specifically, the network access layer is composed of a user configuration composition controller (CUC, centralized User Configuration), a centralized network configuration controller (CNC, centralized Network Configuration) and various types of switches, wherein the TSSDN switches can receive and transmit real-time data from the field device layer gateway, including time sensitive or time insensitive data, and the data forwarding rules and network bandwidth scheduling follow the commands of the CNC controller;
the network access layer adopts a centralized network configuration model integrating TSSDN and OPC UA. The proposed TSSDN architecture consists of a centralized user configuration composition controller (CUC, centralized User Configuration), a centralized network configuration controller (CNC, centralized Network Configuration) and various types of switches (TSN, SDN and TSSDN switches) which are logically located at the application layer, control layer and data layer, respectively. Similar to SDN architecture, when there is a new data flow in the network, CUC will notify CNC user through open north interface, and through the information obtained, CNC carries out corresponding calculation and obtains network configuration parameters, then through south interface, the configuration parameters are transferred to the exchanger in the network, finally the exchanger uses corresponding strategy when forwarding data frame according to the received configuration information;
TSSDN switches contain components related to TSNs and SDNs to meet low latency and reliability requirements in industrial networks. For example, the time synchronization module uses a high precision time synchronization protocol (PTP, precise Time protocol) to achieve time synchronization throughout the network, the frame duplication and cancellation module supports seamless data redundancy, and the schedule traffic module schedules forwarding of data streams based on time division multiple access (TDMA, time division multiple access). Similarly, the flow-based forwarding module matches the flow entries and then performs the corresponding actions according to the flow table. In particular, the publish/subscribe TSN configuration agent module ensures that OPC receives UA data that needs to be guaranteed to be transmitted, i.e., a deterministic path through the network. The interface transparently represents the TSN specific configuration mechanism of the OPC UA device. Therefore, all OPC nodes should support this interface.
The TSSDN architecture combines advantages of TSNs and SDNs, so that many functions suitable for industrial scenarios, such as plug and play, fast reconfiguration, time slot-based traffic scheduling optimization, fault tolerance mechanism and path optimization, can be additionally provided;
the CNC controller knows the global network topology, which is helpful to calculate the optimal transmission schedule or flow table, so that network delay, energy consumption or other QoS performance can be optimized, when a new device is connected to the network, the device is actively discovered by using an OPC UA local discovery server mechanism through a TSSDN architecture, the production line efficiency is improved, a redundant path is utilized, and when the device fails, a safety method can be realized;
where time sensitive data refers to data whose value and meaning change over time, the value of which may be very high at one point in time, but which may decrease rapidly at another point in time, time insensitive data refers to data whose value and meaning do not change over time, the value of which is relatively stable over a long period of time, and in data analysis and decision, the processing methods and analysis techniques of time sensitive data and time insensitive data are different. Time sensitive data needs to be collected, analyzed and applied in time to make decisions in time, while time insensitive data needs to be stored and analyzed for a long period of time to better understand historical trends and development laws.
S225, monitoring and deciding production line data through a top enterprise network layer;
specifically, the system mainly comprises service related applications, a production process knowledge base and OPC UA (optical control unit) receiving or transmitting, is used for monitoring and deciding production line data, specifically, an edge gateway of a field device layer is used for shielding the isomerism of a data format and a communication protocol and providing an OPC UA unified semantic information model;
the enterprise network layer comprises business related applications, a production process knowledge base and an OPC UA client, the layer mainly realizes the applications in specific fields, including real-time monitoring of data, remote control of field devices, decision making of production plans and resource allocation and scheduling, then collects knowledge of manufacturing process flows, process parameters, equipment information, production information and the like, establishes a production process knowledge base, provides reference knowledge for decision making, combines the real-time data and the production process knowledge base, can realize equipment state estimation, fault prediction and strategy formulation by utilizing big data analysis and machine learning, and can also provide interaction of access data and operation for other layers, and the method can be realized through an OPC UA client or an OPC UA release or subscription mechanism.
Specifically, the heterogeneous industrial communication protocol for the device through the field device layer transmits real-time data, and the edge gateway receives the data and establishes a connection with the highest two layers based on the OPC UA communication protocol, which comprises the following steps:
s2231, deploying an edge gateway on a field device layer, and taking the edge gateway as a bridge between field devices and a network access layer;
based on real-time data obtained from field devices, an OPC UA server is integrated into an edge gateway, a corresponding OPC UA unified semantic information model built for each device is built in the OPC UA server, specific devices, parameters and operations are mapped to object nodes, variable nodes and method nodes in an address space of the OPC UA server, and reference relations among the nodes can be added for hierarchical representation;
the gateway also contains a communication module that can establish a connection with an OPC UA client or use connectionless communication of the publish or subscribe mode of OPC UA (OPC UA Pub or Sub) to effect data exchange. Client or server communications work well in the enterprise layer, and can view device status and remotely control devices by invoking method nodes. On the other hand, the connectionless publish or subscribe mode is more suitable for communication between the device and the device or the controller, for example, an OPC UA Ethernet protocol combined with TSN provides low-delay data exchange, and the edge gateway is used as a middleware, so that interaction of a bottom layer and a top layer in the system architecture is realized, a standard data access interface is provided through the OPC UA interface protocol, and the isomerism of a data format is shielded;
s2232, the edge gateway is provided with a physical interface module supporting various industrial communication protocols, uses the communication protocol of the edge gateway to transmit real-time data on a production line, and is connected with heterogeneous field devices through the physical interface module;
s2233, reporting the real-time data to a gateway, calling a protocol analysis module to analyze a protocol, and providing access to field heterogeneous equipment through the edge gateway by shielding the isomerism of the communication protocol;
s3, using a time-sensitive software-defined network switch, and carrying out deterministic delay and reliability detection on data transmission;
specifically, deterministic latency refers to the fact that the latency of data transmission can be predicted and guaranteed, a requirement for real-time control and monitoring. For example, in industrial automation, if the delay time of sensor data is too long, errors and faults in the production process may be caused, thereby affecting the production efficiency and quality, whereas in industrial production, the accuracy and reliability of data directly affect the efficiency of the production process.
S4, an intelligent factory testing platform is constructed, and the OPC UA information model and the collected data are transmitted through the intelligent factory testing platform.
Specifically, a three-layer architecture is realized through an intelligent factory test platform, and effective transmission of data is verified by utilizing an OPC UA server and an OPC UA interface for communicating with field devices.
Wherein, based on the proposal, an intelligent factory test bed is designed, the test bed comprises four components, namely a robot arm, a laser marker, a camera and a conveyor belt, wherein, the aim of the test platform is to produce a personalized box
The basic flow is as follows, firstly, the robot assembles box and case lid, screw up four angles, then convey the assembled box with the conveyer belt, laser marking machine engraves custom content on the box, pass through the completion condition of image inspection equipment and mark step through the camera, wherein in the whole production process, equipment is all controlled by PLC (programmable logic controller), in addition, the test bench has still reserved some workstations, in order to facilitate future expansion, and these physical devices are the main source of information, these equipment are different in communication protocol, for example, IRB 120 robot of ABB company on the test bed adopts industrial ethernet technology's automation bus standard Profinet, laser marking machine adopts modserial communication protocol, define single device as a working unit, similar equipment can be expanded in working unit in the future, each working unit is connected to an edge gateway, in the gateway, realize OPC UA server and OPC UA interface for communicating with field device, adopt the artificial UA interface based on operating system, this edge gateway allows 2 pieces of 1,000 RS2 pieces of ethernet interface and field device can be connected to the interface through the interface of the robot in the interface of field device, can be connected to the interface of the universal serial gateway, the interface can be obtained as the interface between the host computer 120 through the interface, the interface can not be connected to the field device according to the universal serial communication protocol.
The gateway may further be connected to the TSSDN switch or communicate directly with a computer or server running OPC UA clients via ethernet and Wi-Fi interfaces, in which test platform the gateway exposes the data values of the field devices as OPC UA services, whereas OPC UA clients may perform a "read" function, obtain real-time data values from the server, by which design the manager may query the information of each device on-line during production, and in addition, the manager may perform a "write" function, loading the data values to the server.
In summary, by means of the above technical solution of the present invention, the present invention proposes a three-layer industrial internet of things architecture oriented to a manufacturing system, to implement conversion from a traditional automation system to a network physical system, where the architecture combines an OPC UA-based edge gateway with a TSSDN switch, and the OPC UA-based edge gateway shields the isomerism of a communication protocol and a data format, and the TSSDN switch improves the latency and reliability of data transmission.
In addition, the invention realizes the interactive operation of heterogeneous equipment through the OPC UA, the TSSDN realizes the centralized control of network resources and the flexible configuration of a real-time industrial network, and evaluates the applicability of the proposed system architecture through an intelligent factory test bed, realizes the information model and data transmission based on the OPC UA, realizes the communication between an OPC UA server and a client based on TCP or IP, and comprises the reading and writing of device variable real-time values and the calling of a device operation method.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A manufacturing system-oriented low-latency data interaction industrial internet of things architecture method, the method comprising:
s1, collecting real-time data and historical data of facilities in a manufacturing system by combining an operation technology OT and an information technology IT;
s2, constructing a server through the collected data, deploying an edge gateway according to the constructed server by using an OPC UA server, shielding the isomerism of a data format and a protocol, and enabling the devices to communicate with each other;
s3, using a time-sensitive software-defined network switch, and carrying out deterministic delay and reliability detection on data transmission;
s4, an intelligent factory testing platform is constructed, and the OPC UA information model and the collected data are transmitted through the intelligent factory testing platform.
2. The method for constructing the low-latency data interaction industrial internet of things for the manufacturing system according to claim 1, wherein the constructing the server by the collected data and deploying the edge gateway by using the OPC UA server in the constructed server, and the interoperating shielding the data format and the protocol isomerism comprises the following steps:
s21, combining a time sensitive network TSN and a software defined network SDN, and a time sensitive software defined network architecture;
s22, an OPC UA is adopted as an IEC standardized industrial communication protocol, a platform-independent service-oriented architecture is constructed, and raw data of workshops to production plans are exchanged.
3. The method of manufacturing system oriented low latency data interaction industrial internet of things architecture according to claim 2, wherein the combining time sensitive network TSN and software defined network SDN, time sensitive software defined network architecture comprises the steps of:
defining network construction to adopt a TSSDN switch to carry out architecture, wherein the TSSDN switch comprises a TSN and an SDN switch component, and the TSSDN architecture defined by the TSSDN switch comprises a centralized user configuration composition controller, a centralized network configuration controller, the TSN switch, the SDN switch and the TSSDN switch.
4. A method of manufacturing system oriented low latency data interaction industrial internet of things architecture according to claim 3, wherein the employing OPC UA is an IEC standardized industrial communication protocol and constructing a platform independent service oriented architecture and exchanging raw data for shop to production planning comprises the steps of:
s221, constructing a three-layer industrial Internet of things system architecture by adopting a field device layer, a network access layer and an enterprise network layer;
s222, carrying out heterogeneous industrial communication protocol on equipment through a field equipment layer to send real-time data;
s223, receiving data through an edge gateway and establishing connection with the highest two layers based on an OPC UA communication protocol;
s224, receiving and transmitting real-time data from a field device layer gateway through a network access layer, and receiving time sensitive or time insensitive data;
s225, monitoring and deciding production line data through the top enterprise network layer.
5. The method of manufacturing system oriented low latency data interaction industrial internet of things architecture of claim 4, wherein the heterogeneous industrial communication protocol transmission of real time data to devices through the field device layer comprises the steps of:
the heterogeneous industrial communication protocol includes serial port protocol, network protocol, sensor network protocol and wireless communication protocol, and exchanges and shares data between the device and the network through the heterogeneous industrial communication protocol.
6. The method of claim 5, wherein the receiving data via an edge gateway and establishing a connection with a top two layers based on OPC UA communication protocol comprises the steps of:
s2231, deploying an edge gateway on a field device layer, and taking the edge gateway as a bridge between field devices and a network access layer;
s2232, the edge gateway is provided with a physical interface module supporting various industrial communication protocols, uses the communication protocol of the edge gateway to transmit real-time data on a production line, and is connected with heterogeneous field devices through the physical interface module;
s2233, reporting the real-time data to the gateway, calling a protocol analysis module to analyze the protocol, and providing access to the field heterogeneous device through the edge gateway by shielding the isomerism of the communication protocol.
7. The manufacturing system oriented low latency data interaction industrial internet of things architecture method of claim 6, wherein the receiving and transmitting real time data from a field device layer gateway through a network access layer and receiving time sensitive or time insensitive data comprises the steps of:
s2241, collecting, analyzing and applying the received time sensitive data, and making a decision;
s2242, the received time insensitive data is stored for a long time, analyzed, and analyzed according to the historical trend and development rule.
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