CN109361583B - 1553 bus function safety communication system - Google Patents
1553 bus function safety communication system Download PDFInfo
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- CN109361583B CN109361583B CN201811210438.7A CN201811210438A CN109361583B CN 109361583 B CN109361583 B CN 109361583B CN 201811210438 A CN201811210438 A CN 201811210438A CN 109361583 B CN109361583 B CN 109361583B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/12—Applying verification of the received information
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Abstract
The invention relates to a 1553 bus function safety communication system, and belongs to the technical field of computer communication 1553 buses. According to the functional safety communication system of the 1553 bus, fault detection such as state word loss, disorder and the like is realized through the state word serial number checking function, fault detection such as error number, disguise and the like is realized through the message data checking function, response and jitter overtime fault detection are realized through the response time checking function, the functional safety level of the 1553 bus is improved, and the functional safety communication system is particularly suitable for application in severe environments.
Description
Technical Field
The invention belongs to the technical field of computer communication 1553 buses, and particularly relates to a function safety communication system of a 1553 bus.
Background
At present, the research on the Ethernet function safety in the industrial Ethernet is hot, and the method is used for ensuring the adaptability, reliability and maintainability of the Ethernet under various severe environment interferences such as electromagnetism, high temperature, humidity, noise, vibration and the like. For example, PROFIsafe security protocol, CIPSafety protocol, EPASafety protocol, etc. are developed for ethernet.
1553 the bus physical layer adopts Manchester coding, which is the same as the coding algorithm adopted by the Ethernet (10BASE-T) physical layer; 1553 the basic unit (word) of the logical link layer of the bus adopts a parity check method, can only realize single-bit error correction, and is much weaker than the CRC32 check method adopted by the basic unit (frame) of the logical link layer of the Ethernet. Therefore, the 1553 bus is weaker than the ethernet in terms of protocol coding design.
At present, the research on 1553 bus security protocol is still blank. Therefore, a system which is simple and efficient in method and improves 1553 bus function safety is urgently needed.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to design a 1553 bus function safety communication system.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a 1553 bus functional security communication system, including: functional safety BC and functional safety RT;
the functional safety BC is arranged on a bus controller of a 1553 bus functional safety communication system, and comprises: the system comprises a host, a 1553 bus BC protocol controller, a 1553 bus BC function safety controller, a Manchester codec and a 1553 transceiver; the host is used for sending and receiving user original data, the 1553 bus BC protocol controller is used for realizing conversion between the user original data and 1553 protocol data according to a 1553 bus BC protocol, the Manchester codec is used for realizing Manchester encoding and decoding on the 1553 protocol data, and the 1553 transceiver is used for realizing transmission of Manchester codes on a 1553 cable;
the function safety RT is arranged at a remote terminal of a 1553 bus function safety communication system and comprises a host, a 1553 bus RT protocol controller, a 1553 bus RT function safety controller, a Manchester codec and a 1553 transceiver; the host is used for sending or receiving user original data, the 1553 bus RT protocol controller is used for realizing conversion between the user original data and 1553 protocol data according to a 1553 bus RT protocol, the Manchester codec is used for realizing Manchester encoding and decoding on 1553 protocol data, and the 1553 transceiver is used for realizing transmission of Manchester codes on a 1553 cable).
Preferably, the 1553 bus BC function safety controller utilizes a state word sequence number checking module to extract and detect the state word sequence number and provides an interface for transmitting the detection result to the host; the system comprises a message data check module, a host computer and a message data check module, wherein the message data check module is used for calculating, sending, receiving and detecting message data check words and providing an interface for transmitting a detection result to the host computer; the system comprises a response time checking module used for calculating and detecting response time and jitter.
Preferably, the 1553 bus RT function safety controller generates and sends the serial number of the state word by using the serial number checking module of the state word; the system comprises the message data check module, which is used for calculating, sending, receiving and detecting the message data check word and providing an interface for transmitting the detection result to the host.
Preferably, a counter is arranged in the status word sequence number checking module, and when the RT sends a status word, the counter value is increased by 1; setting a modulo-8 arithmetic unit, and carrying out modulo-8 arithmetic on the counter value to obtain a binary number of 3 bits as a serial number of a state word sent by the RT; setting a state word transmitter, and writing the sequence number of the RT transmission state word into a state word reserved bit when the state word is transmitted; setting a state word receiver, extracting the RT address and the reserved bit of the received state word, namely the sequence number of the RT sending state word; setting a comparator, comparing the RT sending state word sequence number corresponding to the RT address with the BC receiving state word sequence number, if the state word sequence numbers are equal, the state word sequence number is successfully verified, otherwise, the state word sequence number fails, and providing an interface for transmitting the detection result to the host; and a memory is also arranged for storing the sequence number of the BC receiving state word according to the RT address, wherein the sequence number of the BC receiving state word is equal to the sequence number of the RT sending state word plus 1.
Preferably, a CRC calculator is arranged in the message data checking module, and performs CRC16 calculation on valid data information to be sent by a message to obtain a 16-bit binary calculation result; setting a data word transmitter, encoding the calculation result of the CRC16 according to the format of the data word to generate a message data check word, and then after the transmission of a specified number of data words is finished, transmitting the message data check word in a word interval-free mode; setting a data word receiver, and receiving 1 data word, namely a message data check word, in a word interval-free mode after receiving a specified number of data words of a message; setting a CRC checker, carrying out CRC check on the effective data information in the message data word and the message data check word, if the check result is consistent, the message data check is successful, otherwise, the message data check is failed, and providing an interface for transmitting the detection result to the host.
Preferably, a memory is arranged in the response time checking module and used for storing the maximum value and the minimum value of the response time according to the RT address and providing an interface for host configuration; setting a timer, and calculating the message interval time between the command and the response according to the RT address; and setting a comparator, if the calculated response time exceeds the maximum response time of the corresponding RT address or is less than the minimum response time of the corresponding RT address, the response time verification fails, otherwise, the response time verification succeeds, and an interface is provided for transmitting the detection result to the host.
(III) advantageous effects
According to the functional safety communication system of the 1553 bus, fault detection such as state word loss, disorder and the like is realized through the state word serial number checking function, fault detection such as error number, disguise and the like is realized through the message data checking function, response and jitter overtime fault detection are realized through the response time checking function, the functional safety level of the 1553 bus is improved, and the functional safety communication system is particularly suitable for application in severe environments.
Drawings
FIG. 1 is a schematic diagram of a functional security BC structure in the present invention;
FIG. 2 is a schematic diagram of the structure of a functional safety RT in the present invention;
FIG. 3 is a diagram of a status word sequence number check module according to the present invention;
FIG. 4 is a schematic diagram of a message data checking module in the present invention;
fig. 5 is a schematic diagram of a response time checking module according to the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
As shown in fig. 1 and fig. 2, the present invention provides a 1553 bus function secure communication system, which mainly includes:
the functional safety BC is installed on a bus controller of a 1553 bus functional safety communication system and mainly comprises a host (used for sending and receiving user original data), a 1553 bus BC protocol controller (used for realizing conversion between the user original data and 1553 protocol data according to a 1553 bus BC protocol), the 1553 bus BC functional safety controller (with functional safety characteristics), a Manchester codec (for realizing Manchester coding and decoding on the 1553 protocol data) and a 1553 transceiver (for realizing transmission of Manchester codes on 1553 cables).
The functional safety RT is installed at a remote terminal of a 1553 bus functional safety communication system and mainly comprises a host (used for sending or receiving user original data), a 1553 bus RT protocol controller (used for realizing conversion between the user original data and 1553 protocol data according to a 1553 bus RT protocol), a 1553 bus RT functional safety controller (with functional safety characteristics), a Manchester codec (used for realizing Manchester encoding and decoding on the 1553 protocol data) and a 1553 transceiver (used for realizing transmission of Manchester codes on a 1553 cable).
1553 bus BC function safety controller:
1. and a state word sequence number checking module is utilized to extract and detect the state word sequence number and provide an interface for transmitting the detection result to the host.
2. The system comprises a message data check module, which is used for calculating, sending, receiving and detecting the message data check word and providing an interface for transmitting the detection result to a host.
3. The system comprises a response time checking module used for calculating and detecting response time and jitter.
1553 bus RT function safety controller:
1. and generating and sending the serial number of the state word by using the state word serial number checking module.
2. The system comprises the message data check module, which is used for calculating, sending, receiving and detecting the message data check word and providing an interface for transmitting the detection result to the host.
As shown in fig. 3, a counter is set in the status word sequence number checking module, and when the RT sends a status word, the counter value is incremented by 1;
a modulo-8 arithmetic unit is arranged in the state word serial number checking module, and binary numbers of 3 bits are obtained after modulo-8 arithmetic is carried out on the counter value and are used as the serial numbers of the RT sending state words;
a state word transmitter is arranged in the state word serial number checking module, and when the state word is transmitted, the sequence number of the RT transmission state word is written into a state word reserved bit (bits 12 to 14);
the state word serial number checking module is provided with a state word receiver for extracting the RT address (bits 4 to 8) and the reserved bit (bits 12 to 14) of the received state word, namely the RT sending state word serial number;
the state word sequence number checking module is internally provided with a comparator which compares the RT sending state word sequence number corresponding to the RT address with the BC receiving state word sequence number, if the state word sequence numbers are equal, the state word sequence number is checked successfully, otherwise, the state word sequence number is failed, and an interface is provided for transmitting the detection result to the host;
and the state word sequence number checking module is internally provided with a memory for storing the BC receiving state word sequence number according to the RT address, wherein the BC receiving state word sequence number is equal to the RT sending state word sequence number plus 1.
As shown in fig. 4, a CRC calculator is arranged in the message data checking module, and performs CRC16 calculation on valid data information to be sent by a message, so as to obtain a 16-bit binary calculation result;
the message data check module is provided with a data word transmitter, the calculation result of the CRC16 is encoded according to the format of the data word to generate a message data check word, and then the message data check word is transmitted in a word interval-free mode after the transmission of the specified number of data words is finished;
the message data check module is provided with a data word receiver, and after a specified number of data words of a message are received, 1 data word, namely a message data check word, is received again in a word interval-free mode;
and a CRC checker is arranged in the message data checking module, the CRC checking is carried out on the effective data information in the message data word and the message data checking word, if the checking result is consistent, the message data checking is successful, otherwise, the message data checking is failed, and an interface is provided for transmitting the detection result to the host.
As shown in fig. 5, a memory is provided in the response time checking module, and is configured to store the maximum value and the minimum value of the response time according to the RT address, and provide an interface for host configuration;
a timer is arranged in the response time checking module, and the message interval time between the command and the response is calculated according to the RT address;
and the response time checking module is internally provided with a comparator, if the calculated response time exceeds the maximum response time value of the corresponding RT address or is less than the minimum response time value of the corresponding RT address, the response time checking fails, otherwise, the response time checking succeeds, and an interface is provided for transmitting the detection result to the host.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A 1553 bus functional safety communication system, comprising: functional safety BC and functional safety RT;
the functional safety BC is arranged on a bus controller of a 1553 bus functional safety communication system, and comprises: the system comprises a host, a 1553 bus BC protocol controller, a 1553 bus BC function safety controller, a Manchester codec and a 1553 transceiver; the host is used for sending and receiving user original data, the 1553 bus BC protocol controller is used for realizing conversion between the user original data and 1553 protocol data according to a 1553 bus BC protocol, the Manchester codec is used for realizing Manchester encoding and decoding on the 1553 protocol data, and the 1553 transceiver is used for realizing transmission of Manchester codes on a 1553 cable;
the function safety RT is arranged at a remote terminal of a 1553 bus function safety communication system and comprises a host, a 1553 bus RT protocol controller, a 1553 bus RT function safety controller, a Manchester codec and a 1553 transceiver; the host is used for sending or receiving user original data, the 1553 bus RT protocol controller is used for realizing conversion between the user original data and 1553 protocol data according to a 1553 bus RT protocol, the Manchester codec is used for realizing Manchester encoding and decoding on the 1553 protocol data, and the 1553 transceiver is used for realizing transmission of Manchester codes on a 1553 cable;
the 1553 bus BC function safety controller utilizes a state word sequence number checking module to extract and detect the state word sequence number and provides an interface for transmitting the detection result to a host; the system comprises a message data check module, a host computer and a message data check module, wherein the message data check module is used for calculating, sending, receiving and detecting message data check words and providing an interface for transmitting a detection result to the host computer; the system comprises a response time checking module, a jitter detection module and a response time checking module, wherein the response time checking module is used for calculating and detecting response time and jitter;
the 1553 bus RT function safety controller generates and sends a state word serial number by using the state word serial number checking module; the system comprises a message data check module, a host computer and a message data check module, wherein the message data check module is used for calculating, sending, receiving and detecting message data check words and providing an interface for transmitting a detection result to the host computer;
a counter is arranged in the state word sequence number checking module, and when the RT sends the state word, the value of the counter is added with 1; setting a modulo-8 arithmetic unit, and carrying out modulo-8 arithmetic on the counter value to obtain a binary number of 3 bits as a serial number of a state word sent by the RT; setting a state word transmitter, and writing the sequence number of the RT transmission state word into a state word reserved bit when the state word is transmitted; setting a state word receiver, extracting the RT address and the reserved bit of the received state word, namely the sequence number of the RT sending state word; setting a comparator, comparing the RT sending state word sequence number corresponding to the RT address with the BC receiving state word sequence number, if the state word sequence numbers are equal, the state word sequence number is successfully verified, otherwise, the state word sequence number fails, and providing an interface for transmitting the detection result to the host; and a memory is also arranged for storing the sequence number of the BC receiving state word according to the RT address, wherein the sequence number of the BC receiving state word is equal to the sequence number of the RT sending state word plus 1.
2. The system of claim 1, wherein a CRC calculator is provided in the message data check module to perform CRC16 calculation on valid data information to be transmitted for a message, resulting in a 16-bit binary calculation result; setting a data word transmitter, encoding the calculation result of the CRC16 according to the format of the data word to generate a message data check word, and then after the transmission of a specified number of data words is finished, transmitting the message data check word in a word interval-free mode; setting a data word receiver, and receiving 1 data word, namely a message data check word, in a word interval-free mode after receiving a specified number of data words of a message; setting a CRC checker, carrying out CRC check on the effective data information in the message data word and the message data check word, if the check result is consistent, the message data check is successful, otherwise, the message data check is failed, and providing an interface for transmitting the detection result to the host.
3. The system of claim 1, wherein the response time checking module is provided with a memory for storing the maximum value and the minimum value of the response time according to the RT address and providing an interface for host configuration; setting a timer, and calculating the message interval time between the command and the response according to the RT address; and setting a comparator, if the calculated response time exceeds the maximum response time of the corresponding RT address or is less than the minimum response time of the corresponding RT address, the response time verification fails, otherwise, the response time verification succeeds, and an interface is provided for transmitting the detection result to the host.
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| 基于1553B协议的总线控制器和远程终端的FPGA实现;孙涛;《中国科学院研究生院学报》;20100715;第27卷(第4期);全文 * |
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