CN109743337B - TCP protocol-based download communication method in nuclear security level DCS system - Google Patents
TCP protocol-based download communication method in nuclear security level DCS system Download PDFInfo
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Abstract
The invention discloses a TCP protocol-based downloading communication method in a nuclear security level DCS, which comprises the following operations: and after the downloaded binary file generated by the engineer station configuration is transmitted to a field control station in the security level DCS, reading back the downloaded data loaded in the field control station, and performing consistency comparison on the read-back downloaded data and the original file data of the downloaded binary file.
Description
Technical Field
The invention belongs to the field of nuclear power DCS systems, and particularly relates to a TCP protocol-based downloading communication method in a nuclear security level DCS system.
Background
The safety level DCS system has the following working modes, namely a downloading mode, a maintenance mode and an operation mode at present. The security level DCS system executes corresponding security functions, the configuration of the security functions is mainly generated through the configuration of an engineer station, and whether the engineer station can correctly send binary files generated through the configuration to the security level DCS system becomes a problem to be solved.
In the current communication link, a user-defined safety protocol is adopted among a plurality of field control stations of the safety level DCS system for transmission, so that the link state maintenance and data interaction conditions among the field control stations are ensured.
The engineer station is mainly responsible for generating and issuing a security level DCS system by an equipment configuration file, an algorithm file and a parameter file. The protocol currently adopted by the engineer station is a general TCP/IP protocol stack, and can tightly combine data generation and transmission. The TCP protocol is used here, since the TCP protocol itself has the following functions: the on-off state of the communication link, an overtime retransmission mechanism, ip packaging and other mature mechanisms can ensure that data can accurately reach a receiving end.
Because different communication protocols are adopted between the security level DCS system and the engineer station, in order to be compatible with the security level DCS system and the engineer station, a protocol conversion module is added between the engineer station and the security level DCS system to be used as a transfer so as to ensure the communication between the engineer station and the security level DCS system.
Disclosure of Invention
The specific technical scheme of the invention is as follows:
the download communication method based on the TCP protocol in the nuclear security level DCS system is characterized by comprising the following operations:
and after the downloaded binary file generated by the engineer station configuration is transmitted to a field control station in the security level DCS, reading back the downloaded data loaded in the field control station, and performing consistency comparison on the read-back downloaded data and the original file data of the downloaded binary file.
Preferably, the following operations are also included:
and obtaining a file header of the downloaded binary file, reading back the file header of the loaded binary file after the downloaded binary file is written into the field control station, and performing data read-back comparison operation on the file header of the loaded binary file and the file header of the downloaded binary file.
Preferably, the structure of the file header of the downloaded binary file and the file header of the loaded binary file includes: at least 1 of file identification, file length, CRC check code, file version, file type, station number and extension reservation; when the data read-back comparison operation of the file header is carried out on the file header of the loaded binary file and the file header of the downloaded binary file, at least 1 of file identification, file length, CRC check code, file version, file type, station number and extension reservation is selected for comparison, and after comparison, if the file headers are not consistent, retransmission operation or rewriting operation or alarm operation is carried out; and if the two are consistent, feeding back that the downloading is successful.
Preferably, when performing the data read-back comparison operation of the file header, the file type is selected as the comparison parameter, and if the file types are not consistent, the retransmission operation or the alarm operation is performed.
Preferably, the consistency comparison between the read-back downloaded data and the original file data of the downloaded binary file is performed by: comparing the binary codes of the downloaded data and the original file data one by one, and if the binary codes are not consistent, carrying out retransmission or rewriting operation or error reporting; and if the two are consistent, feeding back that the downloading is successful.
Preferably, the following operations are also included:
according to the protocol layering process, the process is layered,
the first layer transmits frame data and controls feedback;
the second layer performs transmission and feedback of service layer request packets.
Preferably, the process of transmitting the downloaded binary file generated by the engineer station configuration to the field control station in the security level DCS system is as follows:
acquiring the size of the data of the downloaded binary file, and if the size exceeds the maximum communication transmission value, subpackaging the data of the downloaded binary file;
adding a frame header structure aiming at the data after sub-packaging, wherein the frame structure of single-package frame data comprises: frame length, file length, protocol ID, end mark, frame serial number, effective data and CRC check code;
organizing single-packet frame data to transmit according to a frame sequence number, executing CRC (cyclic redundancy check) after transmitting one single-packet frame data, executing transmission of the single-packet frame data of the next frame sequence number according to the frame sequence number after the CRC is successfully checked, retransmitting if the CRC is not successful, and prompting errors and interrupting transmission after repeated retransmission fails;
each transmission of single packet of frame data responds to the end flag, if the flag is: the field control station performs packaging processing, and performs integrity CRC (cyclic redundancy check) on packaged files;
organizing a frame structure of a service layer request packet for downloading a binary file, wherein the frame structure of the service layer request packet comprises: file length, service type and CRC check code;
and the organization service layer requests packet transmission, performs CRC (cyclic redundancy check) after transmission is finished, and executes a specific service process according to the service type after the CRC is successful.
Preferably, the service types include: at least 1 of the configuration of the downloading platform, the logic of the downloading software, the downloading parameters, the read-back version information, the configuration of the read-back platform, the logic of the read-back software and the read-back parameters.
Preferably, the method further comprises the step of executing overtime retransmission or overtime quitting operation in the process of transmitting the downloaded binary file generated by the engineer station configuration to the field control station in the security level DCS, and the method further has the characteristic of automatic reconnection after communication disconnection.
Preferably, in the process of transmitting the downloaded binary file generated by the engineer station configuration to the field control station in the security level DCS system, the engineer station transmits the downloaded binary file to the protocol conversion module by using a TCP-based download protocol, and then the protocol conversion module transmits the downloaded binary file to the field control station by using a custom security protocol, where the download protocol specifies the meaning of the protocol ID field, including: downloading operation, reading back operation, monitoring operation, sending data to a protocol conversion module and heartbeat operation; and when the protocol ID field is read-back operation, performing consistency comparison on the read-back downloaded data and the original file data of the downloaded binary file.
In the invention, a self-defined communication protocol is adopted between an engineer station and a protocol conversion module of the security level DCS system, the communication protocol has the following characteristics that each frame of data does not exceed a specified value, generally 1k, if the data is improved along with a field control station, the data can be modified in an adaptive manner, partial data overturning and other phenomena can occur in the transmission process, and the engineer station self-defines a downloading protocol on the basis of a TCP protocol to solve the problems caused by the phenomena in order to ensure the correctness and the integrity of data transmission between the engineer station and the security level DCS system. The invention utilizes TCP protocol to define some fields, which makes data be written in after transmission, and executes special read-back comparison operation, in the invention, the data read-back comparison operation of file content and the data read-back comparison operation of file head are executed, thus ensuring that the writing process can also complete correct writing after the correct transmission of data on the basis of TCP protocol, only the writing is correct, the integrity of the whole downloading process can be indicated, the whole process can also be indicated to be safe, therefore, the read-back operation is performed by utilizing the definition of TCP protocol in the invention. Meanwhile, the invention borrows the reliability of the traditional TCP protocol to transmit data, wherein the sub-package, the frame number transmission and the CRC32 verification are common operations of the TCP, but the invention carries out special design on the frame number transmission, namely the requirement is sequential, the receiving end can finish the next frame number transmission after response, otherwise, the frame number transmission is in a retransmission state, the frame number in the traditional TCP is uniformly transmitted and then uniformly confirmed, and then retransmission is carried out, in addition, the invention requires the data and the service request to be carried out in a layering way, namely, the data transmission layer and the service related layer are separated. Because the protocol is realized on the basis of a standard TCP protocol, the characteristics of the TCP such as reliability and the like can be well utilized, and the protocol enhances the effective control of errors and abnormal conditions in the communication process, thereby further improving the reliable transmission; in addition, the difficulty of cracking is increased to a certain extent, and a third party is prevented from intercepting and capturing data information in transmission.
Based on the method, the customized downloading protocol structure is as follows:
the single packet frame structure is shown in table 1 below,
table 1:
and executing a specific business process, wherein the business type needs to be indicated in the protocol. The method comprises the following steps: downloading platform configuration, downloading software logic, downloading parameters, reading back version information, reading back platform configuration, reading back software logic and reading back parameters.
The service layer request packet format definition is shown in table 2 below,
table 2:
| serial number | Item | Size and breadth | Description of the invention |
| 1 | File length | 4 bytes | Actual file length, not exceeding 256KB at maximum |
| 2 | Type of service | 1 byte | Performing actual specified operations |
| 3 | CRC | 4 bytes | Ensuring file transmission check consistency |
The download file header format definition is shown in table 3 below,
table 3:
in the above-mentioned content, when the data read-back comparison operation of the file content and the data read-back comparison operation of the file header are implemented, the data is read back according to the protocol ID in the protocol when the read-back operation is implemented, and when the specific read-back content is executed, the read-back operation is performed according to the service type in the current data service layer request packet, for example, when the data read-back comparison operation of the file content is implemented, the protocol ID at this time is the read-back operation, and the service type is the read-back software logic, the read-back parameter, and the like, thereby forming the read-back comparison of the binary code. When the data read-back comparison operation of the file header is executed, the protocol ID is read-back operation, and meanwhile, the service types comprise read-back version information, read-back platform configuration and the like, so that the read-back of the file header information of the downloaded file is completed.
Compared with the prior art, the invention has the following advantages and beneficial effects: the data communication between the engineer station and the field control station is realized, data with any length can be correctly sent to the field control station, the data issued in the field control station can be read back, the functions of downloading and reading back comparison of the configuration file by the engineer station are realized, the system requirements are met, namely, the protocol solves the problem of large data transmission and improves the reliability of system communication. The compatibility of data transmission between different protocols of different systems is solved. And the configuration of the security level system is guaranteed. The function of downloading and reading back comparison of the configuration file by the engineer station is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a transmission diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not to be construed as limiting the present invention.
Example one
As shown in fig. 1:
the download communication method based on the TCP protocol in the nuclear security level DCS system is characterized by comprising the following operations:
and after the downloaded binary file generated by the engineer station configuration is transmitted to a field control station in the security level DCS, reading back the downloaded data loaded in the field control station, and performing consistency comparison on the read-back downloaded data and the original file data of the downloaded binary file.
Preferably, the following operations are also included:
and obtaining a file header of the downloaded binary file, reading back the file header of the loaded binary file after the downloaded binary file is written into the field control station, and performing data read-back comparison operation on the file header of the loaded binary file and the file header of the downloaded binary file.
Preferably, the structure of the file header of the downloaded binary file and the file header of the loaded binary file includes: at least 1 of file identification, file length, CRC check code, file version, file type, station number and extension reservation; when the data read-back comparison operation of the file header is carried out on the file header of the loaded binary file and the file header of the downloaded binary file, at least 1 of file identification, file length, CRC check code, file version, file type, station number and extension reservation is selected for comparison, and after comparison, if the file headers are not consistent, retransmission operation or rewriting operation or alarm operation is carried out; and if the two are consistent, feeding back that the downloading is successful.
Preferably, when performing the data read-back comparison operation of the file header, the file type is selected as the comparison parameter, and if the file types are not consistent, the retransmission operation or the alarm operation is performed.
Preferably, the consistency comparison between the read-back downloaded data and the original file data of the downloaded binary file is performed by: comparing the binary codes of the downloaded data and the original file data one by one, and if the binary codes are not consistent, carrying out retransmission or rewriting operation or error reporting; and if the two are consistent, feeding back that the downloading is successful.
Preferably, the following operations are also included:
according to the protocol layering process, the process is layered,
the first layer transmits frame data and controls feedback;
the second layer performs transmission and feedback of service layer request packets.
Preferably, the process of transmitting the downloaded binary file generated by the engineer station configuration to the field control station in the security level DCS system is as follows:
acquiring the size of the data of the downloaded binary file, and if the size exceeds the maximum communication transmission value, subpackaging the data of the downloaded binary file;
adding a frame header structure aiming at the data after sub-packaging, wherein the frame structure of single-package frame data comprises: frame length, file length, protocol ID, end mark, frame serial number, effective data and CRC check code;
organizing single-packet frame data to transmit according to a frame sequence number, executing CRC (cyclic redundancy check) after transmitting one single-packet frame data, executing transmission of the single-packet frame data of the next frame sequence number according to the frame sequence number after the CRC is successfully checked, retransmitting if the CRC is not successful, and prompting errors and interrupting transmission after repeated retransmission fails;
each transmission of single packet of frame data responds to the end flag, if the flag is: the field control station performs packaging processing, and performs integrity CRC (cyclic redundancy check) on packaged files;
organizing a frame structure of a service layer request packet for downloading a binary file, wherein the frame structure of the service layer request packet comprises: file length, service type and CRC check code;
and the organization service layer requests packet transmission, performs CRC (cyclic redundancy check) after transmission is finished, and executes a specific service process according to the service type after the CRC is successful.
Preferably, the service types include: at least 1 of the configuration of the downloading platform, the logic of the downloading software, the downloading parameters, the read-back version information, the configuration of the read-back platform, the logic of the read-back software and the read-back parameters.
Preferably, the method further comprises the step of executing overtime retransmission or overtime quitting operation in the process of transmitting the downloaded binary file generated by the engineer station configuration to the field control station in the security level DCS, and the method further has the characteristic of automatic reconnection after communication disconnection.
Preferably, in the process of transmitting the downloaded binary file generated by the engineer station configuration to the field control station in the security level DCS system, the engineer station transmits the downloaded binary file to the protocol conversion module by using a TCP-based download protocol, and then the protocol conversion module transmits the downloaded binary file to the field control station by using a custom security protocol, where the download protocol specifies the meaning of the protocol ID field, including: downloading operation, reading back operation, monitoring operation, sending data to a protocol conversion module and heartbeat operation; and when the protocol ID field is read-back operation, performing consistency comparison on the read-back downloaded data and the original file data of the downloaded binary file.
In the invention, a self-defined safety protocol is adopted between a field control station and a protocol conversion module of the safety-level DCS system, the safety-level DCS system has the following characteristics that each frame of data does not exceed a specified value, generally 1k, if the field control station is improved, the field control station can be modified in an adaptive manner, partial data overturning and other phenomena can occur in the transmission process, and the engineering station can self-define a downloading protocol on the basis of a TCP protocol to solve the problems caused by the phenomena in order to ensure the correctness and the integrity of data transmission between the engineering station and the safety-level DCS system. The invention utilizes TCP protocol to define some fields, which makes data be written in after transmission, and executes special read-back comparison operation, in the invention, the data read-back comparison operation of file content and the data read-back comparison operation of file head are executed, thus ensuring that the writing process can also complete correct writing after the correct transmission of data on the basis of TCP protocol, only the writing is correct, the integrity of the whole downloading process can be indicated, the whole process can also be indicated to be safe, therefore, the read-back operation is performed by utilizing the definition of TCP protocol in the invention. Meanwhile, the invention borrows the reliability of the traditional TCP protocol to transmit data, wherein the sub-package, the frame sequence number transmission and the CRC32 verification are common operations of the TCP, but the invention carries out the special design on the frame sequence number transmission, namely the frame sequence number transmission is required to be transmitted in sequence, the receiving end can finish the next frame sequence number transmission after responding, otherwise, the frame sequence number transmission is in a retransmission state, and the frame sequence number in the traditional TCP is uniformly transmitted and then is uniformly confirmed, and then is retransmitted, therefore, the frame sequence number of the invention is an important factor for guiding the uniqueness of the transmission sequence, and the frame sequence number of the traditional TCP is only used as an identification number during retransmission, namely, a frame of a certain number needs to be retransmitted, and the sequence transmission and the sequence reception are not determined. In addition, the invention requires data and service requests to be carried out hierarchically, i.e. a data transmission layer and a service-related layer are separated. Because the protocol is realized on the basis of a standard TCP protocol, the characteristics of the TCP such as reliability and the like can be well utilized, and the protocol enhances the effective control of errors and abnormal conditions in the communication process, thereby further improving the reliable transmission; in addition, the difficulty of cracking is increased to a certain extent, and a third party is prevented from intercepting and capturing data information in transmission.
Based on the method, the customized downloading protocol structure is as follows:
the single packet frame structure is shown in table 1 below,
table 1:
and executing a specific business process, wherein the business type needs to be indicated in the protocol. The method comprises the following steps: downloading platform configuration, downloading software logic, downloading parameters, reading back version information, reading back platform configuration, reading back software logic and reading back parameters.
The service layer request packet format definition is shown in table 2 below,
table 2:
| serial number | Item | Size and breadth | Description of the invention |
| 1 | File length | 4 bytes | Actual file length, not exceeding 256KB at maximum |
| 2 | Type of service | 1 byte | Performing actual specified operations |
| 3 | CRC | 4 bytes | Ensuring file transmission check consistency |
The download file header format definition is shown in table 3 below,
table 3:
the above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The download communication method based on the TCP protocol in the nuclear security level DCS system is characterized by comprising the following operations:
after a downloaded binary file generated by the engineer station configuration is transmitted to a field control station in a security level DCS (distributed control system) in a downloading mode, reading back downloaded data loaded in the field control station, and performing consistency comparison on the read downloaded data and original file data of the downloaded binary file;
in the process that the downloading binary file generated by the engineer station configuration is transmitted to a field control station in a security level DCS system, the engineer station transmits the downloading binary file to a protocol conversion module by adopting a downloading protocol based on TCP, and then the protocol conversion module transmits the downloading binary file to the field control station by adopting a self-defined security protocol, wherein the downloading protocol specifies the meaning of a protocol ID field, and the method comprises the following steps: downloading operation, reading back operation, monitoring operation, sending data to a protocol conversion module and heartbeat operation; when the protocol ID field is read-back operation, the protocol ID is read-back operation, and meanwhile, the service type is read-back version information or read-back platform configuration, so that the read-back of the file header information of the downloaded file is completed; performing consistency comparison of the read-back downloaded data and the original file data of the downloaded binary file.
2. The method of claim 1, further comprising the following operations:
and obtaining a file header of the downloaded binary file, reading back the file header of the loaded binary file after the downloaded binary file is written into the field control station, and performing data read-back comparison operation on the file header of the loaded binary file and the file header of the downloaded binary file.
3. The method of claim 2, wherein the structure of the header of the downloaded binary file and the header of the loaded binary file comprises: at least 1 of file identification, file length, CRC check code, file version, file type, station number and extension reservation; when the data read-back comparison operation of the file header is carried out on the file header of the loaded binary file and the file header of the downloaded binary file, at least 1 of file identification, file length, CRC check code, file version, file type, station number and extension reservation is selected for comparison, and after comparison, if the file headers are not consistent, retransmission operation or rewriting operation or alarm operation is carried out; and if the two are consistent, feeding back that the downloading is successful.
4. The method of claim 3, wherein if the header is read back and compared, the file type is selected as the comparison parameter, and if the file types are not consistent, the re-transmission operation or the alarm operation is performed.
5. The download communication method based on the TCP protocol in the nuclear security level DCS system of claim 1, wherein the consistency comparison of the read-back download data and the original file data of the download binary file is performed by: comparing the binary codes of the downloaded data and the original file data one by one, and if the binary codes are not consistent, carrying out retransmission or rewriting operation or error reporting; and if the two are consistent, feeding back that the downloading is successful.
6. The method of TCP protocol-based download communication in a nuclear security level DCS system according to any of claims 1-5, further comprising the operations of:
according to the protocol layering process, the process is layered,
the first layer transmits frame data and controls feedback;
the second layer performs transmission and feedback of service layer request packets.
7. The download communication method based on the TCP protocol in the nuclear security level DCS system according to any one of claims 1 to 5, wherein the process of transmitting the download binary file generated by the engineer station configuration to the field control station in the security level DCS system is:
acquiring the size of the data of the downloaded binary file, and if the size exceeds the maximum communication transmission value, subpackaging the data of the downloaded binary file;
adding a frame header structure aiming at the data after sub-packaging, wherein the frame structure of single-package frame data comprises: frame length, file length, protocol ID, end mark, frame serial number, effective data and CRC check code;
organizing single-packet frame data to transmit according to a frame sequence number, executing CRC (cyclic redundancy check) after transmitting one single-packet frame data, executing transmission of the single-packet frame data of the next frame sequence number according to the frame sequence number after the CRC is successfully checked, retransmitting if the CRC is not successful, and prompting errors and interrupting transmission after repeated retransmission fails;
each transmission of single packet of frame data responds to the end flag, if the flag is: the field control station performs packaging processing, and performs integrity CRC (cyclic redundancy check) on packaged files;
organizing a frame structure of a service layer request packet for downloading a binary file, wherein the frame structure of the service layer request packet comprises: file length, service type and CRC check code;
and the organization service layer requests packet transmission, performs CRC (cyclic redundancy check) after transmission is finished, and executes a specific service process according to the service type after the CRC is successful.
8. The method of claim 7, wherein the traffic types include: at least 1 of the configuration of the downloading platform, the logic of the downloading software, the downloading parameters, the read-back version information, the configuration of the read-back platform, the logic of the read-back software and the read-back parameters.
9. The download communication method based on the TCP protocol in the nuclear security level DCS system of claim 7, wherein the download binary file generated by the engineer station configuration further executes an overtime retransmission or an overtime exit operation in a process of transmitting the download binary file to the field control station in the security level DCS system, and further has a feature of automatic reconnection after communication disconnection.
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| CN113156902B (en) * | 2021-04-13 | 2023-01-31 | 西安热工研究院有限公司 | Configuration consistency checking and processing method of DCS (distributed control system) |
| CN115016423B (en) * | 2022-08-04 | 2022-11-01 | 珠海市鸿瑞信息技术股份有限公司 | Industrial control system operation and maintenance management and control system and method based on protocol analysis |
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