An OPCDA to OPCUA protocol conversion device and method for retrofit projects

Abstract

The application discloses an OPC DA and OPC UA protocol conversion device and method for a modification project, wherein an OPC DA data acquisition module and a protocol conversion core module are connected through a first transmission line; the protocol conversion core module and a security protection module are connected through a second transmission line; and the security protection module and an OPC UA data output module are connected through a third transmission line. The device and method can realize bidirectional and efficient conversion of the OPC DA and the OPC UA protocol, and meet the requirements of independent controllability, safety and reliability, and flexible adaptation for a domestic modification project.

Description

Technical Field

[0001] This invention belongs to the field of industrial communication protocol conversion technology, and relates to an OPC DA and OPCUA protocol conversion device and method for transformation projects. Background Technology

[0002] In recent years, many traditional industrial equipment (such as PLCs, sensors, and actuators) in industrial localization projects still use the OPC DA (OLE for Process Control Data Access) protocol for data interaction. As an early industrial communication protocol, the OPC DA protocol suffers from poor compatibility, insufficient security, and lack of cross-platform deployment support, making it difficult to meet the standardization, intelligence, and security requirements of new domestically developed control systems and monitoring platforms after localization. New domestically developed systems generally adopt the OPC UA (OPC Unified Architecture) protocol as the mainstream communication protocol. This protocol has advantages such as platform independence, high security, strong compatibility, and support for complex data types, and can adapt to the software and hardware ecosystem built by domestic operating systems (such as Kylin and Tongxin) and domestically developed chips (such as Loongson and Phytium). However, directly replacing traditional industrial equipment is costly, time-consuming, and wastes existing equipment resources. Therefore, a protocol conversion device is urgently needed to achieve bidirectional conversion between the OPC DA and OPC UA protocols, ensuring the continuity and reliability of data transmission during the localization process. Currently, existing protocol conversion solutions have several shortcomings: First, some conversion equipment relies on imported chips and operating systems, failing to meet the self-controllability requirements of domestic production upgrades; second, high data transmission latency and packet loss rates during conversion affect the real-time performance of industrial production; third, the lack of effective security mechanisms makes them vulnerable to security threats such as data tampering and network attacks; and fourth, the equipment structure is dispersed, wiring is complex, maintenance is difficult, and it is hard to adapt to the personalized needs of different domestic production projects. Therefore, designing an OPC DA to OPC UA protocol conversion device that is adaptable to domestic production upgrades, self-controllable, secure, efficient, and easy to maintain is of significant practical importance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an OPC DA and OPC UA protocol conversion device and method for retrofit projects. This device and method can realize bidirectional and efficient conversion between OPC DA and OPC UA protocols, meeting the requirements of independent controllability, safety and reliability, and flexible adaptation for domestic retrofit projects.

[0004] To achieve the above objectives, this invention discloses an OPC DA to OPC UA protocol conversion device for a retrofit project, comprising a device housing. A device mounting backplate is installed inside the housing. An OPC DA data acquisition module, a protocol conversion core module, a security protection module, an OPC UA data output module, and a power supply module for providing electrical power are fixed to the device mounting backplate by high-strength bolts. The OPC DA data acquisition module and the protocol conversion core module are connected via a first transmission line; the protocol conversion core module and the security protection module are connected via a second transmission line; and the security protection module and the OPC UA data output module are connected via a third transmission line.

[0005] Furthermore, one end of the DA data transmission line is connected to the OPC DA data acquisition module, and the other end of the DA data transmission line passes through the DA data line manifold.

[0006] Furthermore, the OPC UA data output module is connected to one end of the UA data transmission line, and the other end of the UA data transmission line passes through the UA data line manifold.

[0007] Furthermore, one end of the power supply line is connected to the power module, and the other end of the power supply line passes through the power supply line manifold.

[0008] Furthermore, the contact points between the power supply line conduit, UA data line conduit, DA data line conduit and the device enclosure are all sealed with domestically produced fireproof sealant.

[0009] Furthermore, the device housing is integrally formed from domestically produced cold-rolled galvanized sheet, with a brushed and polished outer surface and a domestically produced anti-static coating sprayed on the inside; the door panel and the housing are sealed with domestically produced sealing strips.

[0010] Furthermore, the equipment mounting backplate is made of domestically produced high-strength galvanized steel sheet, and the surface is coated with a domestically produced antistatic coating.

[0011] Furthermore, the OPC DA data acquisition module supports OPC DA version 1.0-3.0 protocols; The OPC UA data output module supports the OPC UA 1.04 protocol. The security protection module uses domestically produced firewall chips and SM2 encryption chips.

[0012] Furthermore, the power supply line manifold, UA data line manifold, and DA data line manifold are all made of domestically produced PVC flame-retardant material.

[0013] This invention discloses a method for converting OPC DA and OPC UA protocols for a retrofit project, comprising the following steps: The OPC DA data acquisition module collects data from traditional industrial equipment and performs preliminary processing to remove invalid and abnormal data, resulting in OPC DA protocol data. The protocol conversion core module converts the OPC DA protocol data into OPC UA protocol data. The security protection module encrypts, authenticates, and controls the access of the OPC UA protocol data. The OPC UA protocol data output module transmits the processed OPC UA protocol data to the domestic target system.

[0014] The present invention has the following beneficial effects: In practical operation, the OPC DA to OPC UA protocol conversion device and method for retrofit projects described in this invention collects data from traditional industrial equipment through the OPC DA data acquisition module and performs preliminary processing to remove invalid and abnormal data. Then, the OPC DA protocol data is converted into OPC UA protocol data through the protocol conversion core module. The OPC UA protocol data is encrypted, authenticated, and access controlled through the security protection module. Finally, the data is output through the OPC UA data output module, realizing bidirectional and efficient conversion between OPC DA and OPC UA protocols. This meets the requirements of independent controllability, security, reliability, and flexible adaptation for domestic retrofit projects. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural diagram of the present invention.

[0017] Figure 2 This is a flowchart of the method of the present invention.

[0018] Among them, 1 is the device enclosure, 2 is the equipment mounting backplate, 3 is the power module, 4 is the OPC DA data acquisition module, 5 is the protocol conversion core module, 6 is the safety protection module, 7 is the OPC UA data output module, 8 is the power supply line, 9 is the DA data transmission line, 10 is the first transmission line, 11 is the second transmission line, 12 is the third transmission line, 13 is the UA data transmission line, 14 is the power supply line conduit, 15 is the UA data line conduit, 16 is the DA data line conduit, and 17 is the high-strength bolt. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0023] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0024] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] Example 1 refer to Figure 1The OPC DA to OPC UA protocol conversion device for a retrofit project described in this invention includes a device housing 1. A device mounting backplate 2 is installed inside the housing 1. An OPC DA data acquisition module 4, a protocol conversion core module 5, a safety protection module 6, an OPC UA data output module 7, and a power supply module 3 for providing electrical power are fixed to the device mounting backplate 2 by high-strength bolts 17. One end of the DA data transmission line 9 is connected to the OPC DA data acquisition module 4, and the other end of the DA data transmission line 9 passes through a DA data line manifold 16. The OPC DA data acquisition module 4 and the protocol conversion core module 5 are connected via a first transmission line 10. The protocol conversion core module 5 and the safety protection module 6 are connected via a second transmission line 11. The safety protection module 6 and the OPC UA data output module 7 are connected via a third transmission line 12. The UA data output module 7 is connected to one end of the UA data transmission line 13, and the other end of the UA data transmission line 13 passes through the UA data line manifold 15. One end of the power supply line 8 is connected to the power supply module 3, and the other end of the power supply line 8 passes through the power supply line manifold 14. The contact points between the power supply line manifold 14, the UA data line manifold 15, the DA data line manifold 16, and the device enclosure 1 are all sealed with domestically produced fireproof sealant. External industrial equipment is connected to the OPC DA data acquisition module 4 via the DA data transmission line 9; the OPC UA data output module 7 is connected to the monitoring system and production management platform via the UA data transmission line 13; the external power supply system and UPS are connected to the power supply module 3 via the power supply line 8; and the remote management platform is connected to the protocol conversion core module 5.

[0028] The device housing 1 is made of domestically produced cold-rolled galvanized sheet in one piece, with a side wall thickness of 0.7cm. The outer surface is brushed and polished, and the interior is sprayed with a 3.5mm thick domestically produced anti-static coating. The door panel in the device housing 1 is sealed with domestically produced sealing strips, and the protection level reaches IP65.

[0029] The equipment mounting backplate 2 is made of domestic high-strength galvanized sheet with a thickness of 0.55cm. The surface is coated with a 2.5mm thick domestic antistatic coating. The backplate has a mesh diameter of 6mm and a mesh density of 35 meshes per square decimeter. It is fixed to the device housing 1 by high-strength bolts 17.

[0030] The power module 3 uses domestically produced chips, with an input voltage of AC 220V±10%, an output voltage of DC 12V / DC24V, and an output power of 100W. It has overvoltage, overcurrent, and short-circuit protection functions and can be adapted to domestically produced UPS uninterruptible power supplies.

[0031] The OPC DA data acquisition module 4 supports OPC DA version 1.0-3.0 protocol and can simultaneously connect 16 OPC DA protocol devices with an acquisition frequency of less than 1 second.

[0032] The protocol conversion core module 5 is based on a domestically produced ARM architecture chip, equipped with the Kylin operating system, and has a built-in independently developed protocol conversion algorithm. The conversion latency is ≤5ms, the packet loss rate is ≤0.01%, and it supports software upgrades and expansions.

[0033] The OPC UA data output module 7 supports the OPC UA 1.04 protocol, supports UA-TCP and HTTPS transmission methods, can connect to 4 domestic target systems simultaneously, and supports data caching and retransmission.

[0034] The security protection module 6 uses a domestically produced firewall chip and an SM2 encryption chip, supporting AES-256 data encryption, SM2 digital certificate authentication, and IP whitelist access control.

[0035] The power supply line conduit 14, UA data line conduit 15, and DA data line conduit 16 are all made of domestic PVC flame-retardant material with a cross-sectional diameter of 4cm; the data transmission line uses domestic Category 6 shielded RJ45 network cable.

[0036] Example 2 refer to Figure 2 In a localization upgrade project of a thermal power plant, the company's existing production equipment (including PLC controllers, temperature and pressure sensors, flow actuators, etc.) all used the OPC DA 2.0 protocol. The newly added monitoring system and production management platform after the localization upgrade use the OPC UA 1.04 protocol, requiring data transmission between the two. This invention is used for the upgrade, and the specific implementation steps are as follows: 1) Equipment installation and wiring; The protocol conversion device of this invention is installed in a standard cabinet in the enterprise's central control room, and fixed in a well-ventilated location with minimal electromagnetic interference. Using domestically produced Category 6 RJ45 network cables, traditional industrial equipment is connected to the OPC DA data acquisition module 4 via DA data transmission line 9, and the OPC UA data output module 7 is connected to the domestically produced monitoring system and production management platform via UA data transmission line 13. The external domestically produced power supply system and UPS uninterruptible power supply are connected to the power module 3 via power supply line 8. Each line is then collected and fixed using corresponding conduits, and the contact points between the conduits and the device enclosure are sealed with domestically produced fireproof sealant to ensure the lines are safe and orderly.

[0037] 2) System configuration and initialization; Log in to the management interface of the protocol conversion core module 5 through the domestic remote management platform, and configure the OPC DA data acquisition parameters: select the OPC DA 2.0 protocol version, set 16 device access channels, and a acquisition frequency of 1 second; configure the protocol conversion parameters: set the data type mapping relationship (map the PLC's integer data to the UA's signed 32-bit integer data, and the sensor's floating-point data to the UA's double-precision floating-point data); configure the OPC UA output parameters: select the UA-TCP transmission mode, set the IP addresses and port numbers of the four domestic target systems, and enable the data caching function; configure the security protection parameters: set the whitelist of allowed device IPs and enable AES-256 data encryption.

[0038] 3) Data acquisition and protocol conversion; According to the configuration parameters, the OPC DA data acquisition module 4 collects data such as temperature, pressure, flow rate, and equipment operating status from traditional industrial equipment and transmits it to the protocol conversion core module 5. The protocol conversion core module 5 uses a self-developed conversion algorithm to quickly convert OPC DA protocol data into OPC UA protocol data with a conversion delay of about 1 second and no data loss.

[0039] It should be noted that this invention achieves the conversion between OPC DA and OPC UA protocols by integrating domestically produced core modules. Specifically, the power supply module 3 provides stable and reliable power to each functional module and provides protection in case of power failure; the OPC DA data acquisition module 4 collects data from traditional industrial equipment and performs preliminary processing to remove invalid and abnormal data; the protocol conversion core module 5, based on a domestically produced operating system and independently developed conversion algorithm, converts OPC DA protocol data into OPC UA protocol data that meets the requirements of the domestically produced target system; the security protection module 6 encrypts, authenticates, and controls the transmitted data to ensure data transmission security; and the OPC UA data output module 7 transmits the processed secure data to the domestically produced target system or receives control commands from the target system, realizing seamless, secure, and efficient data interaction between traditional industrial equipment and the domestically produced system, thus facilitating the smooth implementation of domestic transformation projects.

[0040] This invention has the following characteristics: Independent and controllable, adapted to domestic production: The core chips, operating system and key components of the device are all domestic products, which fully meet the independent and controllable requirements of the domestic transformation project, avoid dependence on imported products and ensure industrial communication security.

[0041] Highly efficient and stable conversion: It adopts a self-developed protocol conversion algorithm and high-performance domestic chips to achieve rapid conversion between OPC DA and OPC UA protocols. The conversion latency is low and the packet loss rate is low, ensuring the real-time and continuous nature of industrial production data; it also has a buffer and retransmission function to further improve the stability of data transmission.

[0042] Comprehensive security protection: It integrates domestically produced encryption chips and firewall chips, uses national cryptographic algorithms for data encryption and identity authentication, and combines access control and other functions to build a comprehensive security protection system that effectively resists various network security threats and meets the security requirements of industrial data transmission.

[0043] Highly flexible and adaptable: At the hardware level, it supports the installation of expanded equipment and flexible wiring; at the software level, it supports protocol version upgrades and functional module expansion, making it adaptable to domestic transformation projects of different scales and types, reducing later maintenance costs.

[0044] Easy installation and maintenance: The integrated design integrates all functional modules into one device box, reducing the complexity of external wiring; the equipment installation is standardized and clearly labeled, and the line aggregation and protection components facilitate line organization and maintenance, adapting to the installation and operation and maintenance needs of industrial sites.

[0045] Example 3 A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the OPCDA to OPC UA protocol conversion method for a transformation project. For example, the method includes: acquiring data from traditional industrial equipment via an OPCDA data acquisition module 4 and performing preliminary processing to remove invalid and abnormal data, obtaining OPCDA protocol data; converting the OPCDA protocol data to OPC UA protocol data via a protocol conversion core module 5; encrypting, authenticating, and controlling access to the OPC UA protocol data via a security protection module 6; and transmitting the processed OPC UA protocol data to a domestically developed target system via an OPC UA data output module 7. The memory may include RAM, such as high-speed random access memory, or it may also include non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus, which can be an industry standard architecture bus, a peripheral component interconnection standard bus, an extended industry standard architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs; specifically, the program may include program code, which includes computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0046] Example 4 A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the OPC DA to OPC UA protocol conversion method for a modification project. For example, the method includes: acquiring data from traditional industrial equipment via an OPC DA data acquisition module 4 and performing preliminary processing to remove invalid and abnormal data, obtaining OPC DA protocol data; converting the OPC DA protocol data to OPC UA protocol data via a protocol conversion core module 5; encrypting, authenticating, and controlling access to the OPC UA protocol data via a security protection module 6; and transmitting the processed OPC UA protocol data to a domestically developed target system via an OPC UA data output module 7. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0047] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0048] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0049] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0050] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0051] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0052] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0053] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An OPC DA to OPC UA protocol conversion device for a retrofit project, characterized in that, The device includes a housing (1), and a device mounting backplate (2) is provided inside the housing (1). The device mounting backplate (2) is fixed with an OPC DA data acquisition module (4), a protocol conversion core module (5), a security protection module (6), an OPC UA data output module (7), and a power supply module (3) for providing power by high-strength bolts (17). The OPC DA data acquisition module (4) and the protocol conversion core module (5) are connected through a first transmission line (10); the protocol conversion core module (5) and the security protection module (6) are connected through a second transmission line (11); and the security protection module (6) and the OPC UA data output module (7) are connected through a third transmission line (12).

2. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 1, characterized in that, One end of the DA data transmission line (9) is connected to the OPC DA data acquisition module (4), and the other end of the DA data transmission line (9) passes through the DA data line collection pipe (16).

3. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 2, characterized in that, The OPC UA data output module (7) is connected to one end of the UA data transmission line (13), and the other end of the UA data transmission line (13) passes through the UA data line collection tube (15).

4. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 3, characterized in that, One end of the power supply line (8) is connected to the power module (3), and the other end of the power supply line (8) passes through the power supply line collection pipe (14).

5. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 4, characterized in that, The contact points between the power supply line conduit (14), the UA data line conduit (15), the DA data line conduit (16) and the device enclosure (1) are all sealed with domestic fireproof putty.

6. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 1, characterized in that, The device housing (1) is made of domestic cold-rolled galvanized sheet in one piece, with the outer surface brushed and polished, and the interior sprayed with domestic anti-static coating; the door panel of the device housing (1) is sealed with domestic sealing strip.

7. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 1, characterized in that, The equipment mounting backplate (2) is made of domestic high-strength galvanized steel sheet, and the surface is coated with domestic antistatic coating.

8. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 1, characterized in that, The OPC DA data acquisition module (4) supports OPC DA version 1.0-3.0 protocol; The OPC UA data output module (7) supports the OPC UA 1.04 version protocol; The security protection module (6) uses a domestic firewall chip and an SM2 encryption chip.

9. The OPC DA to OPC UA protocol conversion device for a retrofit project according to claim 4, characterized in that, The power supply line conduit (14), UA data line conduit (15) and DA data line conduit (16) are all made of domestic PVC flame-retardant material.

10. A method for converting OPC DA and OPC UA protocols for a retrofit project, characterized in that, The OPC DA to OPC UA protocol conversion device for a retrofit project as described in claim 1 includes the following steps: The OPC DA data acquisition module (4) collects data from traditional industrial equipment and performs preliminary processing to remove invalid and abnormal data, thereby obtaining OPC DA protocol data. The OPC DA protocol data is converted into OPC UA protocol data through the protocol conversion core module (5). The OPC UA protocol data is encrypted, authenticated, and access controlled through the security protection module (6). The processed OPC UA protocol data is transmitted to the domestic target system through the OPC UA data output module (7).

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