A self-conversion method based on modbus-tcp protocol
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A conversion method and protocol technology, applied in the direction of transmission system, electrical components, etc., can solve the problems of insufficient transmission distance, transmission rate and transmission data volume
Active Publication Date: 2020-11-20
CHINA NUCLEAR CONTROL SYST ENG
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[0006] Therefore, aiming at the deficiencies of the fieldbus protocol in the control system, a method based on the Modbus-TCP protocol and local protocol conversion is introduced here to solve the problems of insufficient transmission distance, transmission rate and transmission data volume in heterogeneous systems.
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Embodiment 1
[0039] A self-converting method based on the Modbus-TCP protocol, which is applied to the nuclear power control system, and the gateway module realizes the connection of the third-party system to the system, and realizes the usability and scalability of the system;
[0040] The concrete steps of this method are as follows:
[0041] Step 1: Protocol Analysis
[0042] After the gateway module receives the Modbus-TCP response message, it analyzes and obtains the data segment DU1 according to the Modbus-TCP protocol;
[0043] Step 2: Protocol conversion
[0044] The gateway module maps the data segment DU1 according to the local protocol to obtain the corresponding data segment DU2;
[0045] The third step: protocol package
[0046] The gateway module packs the data segment DU2 according to the local protocol to obtain the corresponding message, and sends it to the local protocol;
[0047] In the same way, the process of sending from the local protocol to the Modbus-TCP networ...
Embodiment 2
[0064]According to the above description, this patented invention is further described through an example. Suppose an analog point POINT1 is transmitted from a third-party system, and the data type is FLOAT. On the Modbus-TCP side, 2 registers are required for transmission, and the register start address is set to 0x0001; on the local protocol side, 4 bytes are required to store the data, and it is set as channel 1, that is, the data type of channel 1 is initialized to FLOAT type .
[0065] Step 1: The gateway module receives the Modbus-TCP message, and after parsing, it gets the data of the data type FLOAT, and the register address of bit[24-31] is 0x0001.
[0066] Step 2: Convert the above data from the DU1 section protocol to DU2, and put the FLOAT data into channel 1 of DU2.
[0067] Step 3: Pack the data of DU2 according to the local protocol and send it to the local protocol.
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Abstract
The invention relates to the field of industrial grade control system data communication, particularly the field of data real-time communication between heterogeneous networks, and specifically relates to a self-conversion method based on a Modbus-TCP protocol. For the problem that protocols do not match, the transmission data quantity is low and the transmission distance is short exists in the data transmission between the heterogeneous systems of the existing nuclear power control system, the invention designs the self-conversion method based on the Modbus-TCP protocol. According to the method, the conversion between the Modbus-TCP protocol and a local bus protocol is realized, so the data transmission between heterogeneous systems is solved; through adoption of a Modbus-TCP network, theproblem of requiring high transmission data quantity, long transmission distance and rapid transmission rate between the two heterogeneous systems is solved; and through adoption of a self-defined RS485 bus protocol, the data interaction between a controller and a gateway module can be realized rapidly, periodically and accurately, a third party device / system accesses the nuclear power control system, and the availability and expansibility of own system are realized.
Description
technical field [0001] The invention relates to the field of data communication of industrial-level control systems, in particular to the field of real-time data communication between heterogeneous networks, and in particular to a self-converting method based on the Modbus-TCP protocol. Background technique [0002] As the DCS control system is more and more widely used in nuclear power control, the development of fieldbus technology has changed the structure of the control system, but with the emergence of more and more fieldbus protocols, data transmission between heterogeneous systems has become It is becoming more and more difficult, resulting in the inability to directly conduct data mutual access and interaction. [0003] At the same time, in order to avoid the RS232 interface used in the system for low-speed, short-distance transmission, the heterogeneous system needs to achieve high-speed, fast transmission of large data volumes. [0004] The Modbus-TCP protocol enc...
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