CN107528747B - Method and device for diagnosing communication state of master station and slave station and computer readable storage medium - Google Patents
Method and device for diagnosing communication state of master station and slave station and computer readable storage medium Download PDFInfo
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- 238000003745 diagnosis Methods 0.000 claims abstract description 25
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
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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
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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Abstract
The embodiment of the invention discloses a diagnosis method, a diagnosis device and a computer readable storage medium, wherein the diagnosis method comprises the following steps: the standby host receives the first data through the serial bus and recognizes that the received first data is a request message sent by the communication host; the standby host receives the second data through the serial bus and recognizes that the received second data is a response message sent by the slave station; and the standby host diagnoses the communication state between the master station and the slave station according to the request message and the response message. According to the scheme of the embodiment of the invention, the standby host firstly identifies the request message sent by the communication host, then identifies the response message sent by the slave station, and then diagnoses according to the request message and the response message without sending the request message to realize the diagnosis, and simultaneously considers the real-time performance of the communication state diagnosis between the master station and the slave station and the communication fluency of the master station.
Description
Technical Field
The present invention relates to serial bus communication technology, and is especially serial bus communication state diagnosing method and device and computer readable storage medium.
Background
In serial bus communication, communication uses a Master-Slave (Slave) technology, that is, only one Master can initiate transmission at the same time, and the Slave responds to data provided by Master inquiry. When the master stations are redundant, only one master station can initiate a request at the same time, and the other master station must be silent, otherwise, communication failure can be caused because the received communication data is messy codes due to serial bus collision. For convenience of description, the redundant master station is referred to as a communication host (also referred to as a host) and a standby host (also referred to as a standby host), the host is referred to as a Front-End communication Processor (FEP) -a, and the standby is referred to as an FEP-B. As shown in FIG. 1, the primary station comprises FEP-A and FEP-B which are redundant to each other, the FEP-A and the FEP-B are connected through ｃA dual-machine heartbeat line and are connected to the serial bus, and the secondary stations comprise N devices which are connected to the serial bus one by one respectively.
In order to report a communication fault between the master station and the slave station in time and switch the standby station to the master station in time when the master station has a fault, the communication state between the master station and the slave station needs to be diagnosed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for diagnosing the communication states of a master station and a slave station and a computer readable storage medium, which can take the real-time diagnosis of the communication states between the master station and the slave station and the communication fluency of the master station into consideration.
The embodiment of the invention provides a method for diagnosing communication states of a master station and a slave station, which comprises the following steps:
the standby host receives the first data through the serial bus and recognizes that the received first data is a request message sent by the communication host;
the standby host receives the second data through the serial bus and recognizes that the received second data is a response message sent by the slave station;
and the standby host diagnoses the communication state between the master station and the slave station according to the request message and the response message.
Optionally, when the diagnosis period comes, the standby host executes the receiving of the first data through the serial bus, and recognizes that the received first data is a request message sent by the communication host; and receiving the second data through the serial bus, and recognizing that the received second data is a response message sent by the slave station.
Optionally, when the standby host recognizes that the first data is a request message sent by the communication host and recognizes that the second data is a response message sent by the slave station, the standby host diagnoses the communication state between the master station and the slave station according to the last recognized request message and response message;
wherein N is an integer greater than or equal to 1.
Optionally, the standby host and the communication host communicate with each other by using a 103 protocol; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the first byte of the first data is 68H, and acquires a fifth byte of the first data;
and the standby host judges that the second highest bit of the fifth byte is 1, the data length of the fifth byte is legal, the checksum of the fifth byte is legal, and the first data is determined to be a request message sent by the communication host.
Optionally, the standby host and the communication host communicate with each other by using a 103 protocol; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the first byte of the first data is 10H, and acquires the second byte of the first data;
and the standby host judges that the second highest bit of the second byte is 1, the data length of the second byte is legal, the checksum of the second byte is legal, and the first data is determined to be a request message sent by the communication host.
Optionally, the standby host and the communication host communicate with each other by using a Modbus protocol; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the data length of the first data is greater than or equal to 8 bytes, the first data is in a bus mode currently, the target address of the first data is not 0, the function code of the first data is 1 or 2 or 3 or 4, the same request message exists in a local request list, the checksum of the first data is legal, and the first data is determined to be the request message sent by the communication host.
The embodiment of the present invention further provides a device for diagnosing a communication state of a master station and a slave station, including:
the identification module is used for receiving the first data through the serial bus and identifying the received first data as a request message sent by the communication host; receiving second data through a serial bus, and identifying that the received second data is a response message sent by a slave station;
and the diagnosis module is used for diagnosing the communication state between the master station and the slave station according to the request message and the response message.
Optionally, the identification module is specifically configured to:
when a diagnosis period comes, executing the first data received through the serial bus, and identifying that the received first data is a request message sent by a communication host; and receiving the second data through the serial bus, and recognizing that the received second data is a response message sent by the slave station.
Optionally, the identification module is specifically configured to:
receiving first data through a serial bus for N times continuously, and identifying the received first data as a request message sent by a communication host; receiving second data through a serial bus, and identifying that the received second data is a response message sent by a slave station; wherein N is an integer greater than or equal to 1;
the diagnostic module is specifically configured to:
and diagnosing the communication state between the master station and the slave station according to the last identified request message and response message.
An embodiment of the present invention further provides a standby host, which includes a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the steps of any one of the above diagnosis methods are implemented.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any one of the diagnosis methods described above.
Compared with the related art, the embodiment of the invention comprises the following steps: the standby host receives the first data through the serial bus and recognizes that the received first data is a request message sent by the communication host; the standby host receives the second data through the serial bus and recognizes that the received second data is a response message sent by the slave station; and the standby host diagnoses the communication state between the master station and the slave station according to the request message and the response message. According to the scheme of the embodiment of the invention, the standby host firstly identifies the request message sent by the communication host, then identifies the response message sent by the slave station, and then diagnoses according to the request message and the response message without sending the request message to realize the diagnosis, and simultaneously considers the real-time performance of the communication state diagnosis between the master station and the slave station and the communication fluency of the master station.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a conventional serial bus communication system;
fig. 2 is a flowchart of a method for diagnosing communication states of master and slave stations according to an embodiment of the present invention;
fig. 3 is a schematic structural composition diagram of a master-slave station communication state diagnosis device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a standby host according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
A conventional master-slave station communication state diagnosis method roughly includes:
the standby host is switched to ｃA temporary communication host (meanwhile, the original communication host FEP-A is switched to the temporary standby host to keep ｃA silent state) at regular intervals (for example, 30 seconds), ｃA request message is sent through ｃA serial bus, the request message is synchronized to the communication host through ｃA dual heartbeat line, ｃA response message of ｃA slave station is identified in preset time, datｃA processing is carried out on the response message, the state of local equipment is updated to be in an online state, ｃA response is synchronized to the FEP-A through the dual heartbeat line, and the communication state between the master station and the slave station is diagnosed according to the sent request message and the identified response message.
In the conventional method for diagnosing the communication states of the master station and the slave station, during the period of switching the standby host to the temporary communication host, the communication host in the working state can only be silent, and no request can be generated, so that precious serial bus resources are occupied. Once a plurality of devices are connected to the serial bus, this diagnostic method will have a very significant effect on the communication fluency of the communication host, and if the WatchTime is short, although the real-time performance of the standby host for diagnosing the communication state between the master station and the slave station can be ensured, the communication fluency of the communication host and the devices is interrupted. On the other hand, if the WatchTime is long, although the communication between the communication host and the device is ensured to be smooth, the real-time performance of the standby host on the communication state diagnosis between the master station and the slave station is lost. In summary, this diagnostic method is difficult to achieve both real-time diagnosis of the communication state between the master station and the slave station by the backup host and communication smoothness of the communication by the communication host.
Based on the above problem, because the serial bus has a characteristic that the message sent by any communication node on the serial bus can be received by other nodes on the serial bus. Based on this feature, the embodiment of the present invention provides a diagnostic method for, during communication between a communication host and a slave, although the standby host itself is silent and does not initiate a message, the standby host can still receive the request message sent by the communication host and the response message sent by the slave, the serial bus protocol can identify the request message sent by the communication host and the response message sent by the slave station, namely, the data stream received by the standby host in the silent period must sequentially contain the request message sent by the communication host and the response message sent by the slave, through the protocol attribute of the serial bus protocol, the standby host recognizes the request message sent by the communication host, recognizes the response message sent by the slave station, and then diagnoses according to the request message and the response message, the diagnosis is realized without sending a request message by the master station, and the real-time performance of the communication state diagnosis between the master station and the slave station and the communication fluency of the master station are considered.
Referring to fig. 2, an embodiment of the present invention provides a method for diagnosing a communication state of a master station and a slave station, including:
step 200, the standby host receives the first data through the serial bus, and recognizes that the received first data is a request message sent by the communication host.
In this step, the standby host and the communication host communicate by using a serial bus protocol.
The serial bus protocol comprises Modbus, IEC60870-5-101, IEC60870-5-103 and the like.
When the standby host and the communication host communicate by adopting a 103 protocol, recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the first byte of the first data is 68H, and acquires a fifth byte of the first data; and the standby host judges that the second highest bit of the fifth byte is 1, the data length of the fifth byte is legal, the checksum of the fifth byte is legal, and the first data is determined to be a request message sent by the communication host.
Or, the standby host judges that the first byte of the first data is 10H, and acquires the second byte of the first data; and the standby host judges that the second highest bit of the second byte is 1, the data length of the second byte is legal, the checksum of the second byte is legal, and the first data is determined to be a request message sent by the communication host.
When the standby host judges that the second highest bit of the fifth byte is not 1, or the data length of the fifth byte is illegal, or the checksum of the fifth byte is illegal, the standby host determines that the first data is not a request message sent by the communication host.
When the standby host judges that the second-highest bit of the second byte is not 1, or the data length of the second byte is illegal, or the checksum of the second byte is illegal, the standby host determines that the first data is not the request message sent by the communication host.
When the standby host and the communication host communicate by using a Modbus protocol (fully referred to as Modbus protocol-based industrial automation network specification GB/T19582), recognizing the received first data as a request message sent by the communication host comprises:
the standby host judges that the data length of the first data is larger than or equal to 8 bytes, the first data is in a bus mode at present, the target address of the first data is not 0, the function code of the first data is 1 or 2 or 3 or 4, the same request message exists in a local request list, the checksum of the first data is legal, and the first data is determined to be the request message sent by the communication host.
When the standby host judges that the data length of the first data is less than 8 bytes, or the data is not in a bus mode currently, or the target address of the first data is 0, or the function code of the first data is not any one of 1, 2, 3 and 4, or the same request does not exist in a local request list, or the checksum of the first data is illegal, the first data is determined not to be a request message sent by the communication host.
For other serial bus protocols, corresponding protocol attributes may be used to identify whether the first data is a request message sent by a communication host.
In the above method, the standby host may perform step 200 and step 201 when the diagnosis period comes.
In the method, the standby host can continuously identify the first data as the request message sent by the communication host and identify the second data as the response message sent by the slave station for N times, and the communication state between the master station and the slave station is diagnosed according to the last identified request message and response message;
wherein N is an integer greater than or equal to 1.
Referring to fig. 3, an embodiment of the present invention further provides a device for diagnosing a communication state of a master station and a slave station, including:
the identification module is used for receiving the first data through the serial bus and identifying the received first data as a request message sent by the communication host; receiving second data through a serial bus, and identifying that the received second data is a response message sent by a slave station;
and the diagnosis module is used for diagnosing the communication state between the master station and the slave station according to the request message and the response message.
Optionally, the identification module is specifically configured to:
when a diagnosis period comes, executing the first data received through the serial bus, and identifying that the received first data is a request message sent by a communication host; and receiving the second data through the serial bus, and recognizing that the received second data is a response message sent by the slave station.
Optionally, the identification module is specifically configured to:
receiving first data through a serial bus for N times continuously, and identifying the received first data as a request message sent by a communication host; receiving second data through a serial bus, and identifying that the received second data is a response message sent by a slave station; wherein N is an integer greater than or equal to 1;
the diagnostic module is specifically configured to:
and diagnosing the communication state between the master station and the slave station according to the last identified request message and response message.
Referring to fig. 4, an embodiment of the present invention further provides a standby host, including a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the steps of any one of the above-mentioned diagnostic methods are implemented.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any one of the above-mentioned diagnostic methods.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for diagnosing communication states of a master station and a slave station, comprising:
the standby host receives the first data through the serial bus and recognizes that the received first data is a request message sent by the communication host;
the standby host receives the second data through the serial bus and recognizes that the received second data is a response message sent by the slave station;
the standby host diagnoses the communication state between the master station and the slave station according to the request message and the response message;
the standby host and the communication host communicate by adopting a 103 protocol; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the first byte of the first data is 68H, and acquires a fifth byte of the first data;
the standby host judges that the second highest bit of the fifth byte is 1, the data length of the fifth byte is legal, the checksum of the fifth byte is legal, and the first data is determined to be a request message sent by the communication host;
the standby host and the communication host adopt a 103 protocol for communication; the identifying that the received first data is the request message sent by the communication host further includes:
the standby host judges that the first byte of the first data is 10H, and acquires the second byte of the first data;
the standby host judges that the second highest bit of the second byte is 1, the data length of the second byte is legal, the checksum of the second byte is legal, and the first data is determined to be a request message sent by the communication host;
the standby host and the communication host communicate by adopting a Modbus protocol; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the data length of the first data is greater than or equal to 8 bytes, the first data is in a bus mode currently, the target address of the first data is not 0, the function code of the first data is 1 or 2 or 3 or 4, the same request message exists in a local request list, the checksum of the first data is legal, and the first data is determined to be the request message sent by the communication host.
2. The diagnostic method according to claim 1, wherein the standby host executes the receiving of the first data through the serial bus when the diagnostic cycle arrives, and recognizes that the received first data is a request message sent by the communication host; and receiving the second data through the serial bus, and recognizing that the received second data is a response message sent by the slave station.
3. The diagnostic method according to claim 1, wherein the backup host diagnoses the communication state between the master station and the slave station based on the last identified request message and response message when the backup host identifies N consecutive times that the first data is the request message sent by the communication host and the second data is the response message sent by the slave station;
wherein N is an integer greater than or equal to 1.
4. A master-slave station communication state diagnosis device is characterized by comprising:
the identification module is used for receiving the first data through the serial bus and identifying the received first data as a request message sent by the communication host; receiving second data through a serial bus, and identifying that the received second data is a response message sent by a slave station;
the diagnosis module is used for diagnosing the communication state between the master station and the slave station according to the request message and the response message;
wherein, the standby host and the communication host adopt a 103 protocol for communication; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the first byte of the first data is 68H, and acquires a fifth byte of the first data;
the standby host judges that the second highest bit of the fifth byte is 1, the data length of the fifth byte is legal, the checksum of the fifth byte is legal, and the first data is determined to be a request message sent by the communication host;
the standby host and the communication host adopt a 103 protocol for communication; the identifying that the received first data is the request message sent by the communication host further includes:
the standby host judges that the first byte of the first data is 10H, and acquires the second byte of the first data;
the standby host judges that the second highest bit of the second byte is 1, the data length of the second byte is legal, the checksum of the second byte is legal, and the first data is determined to be a request message sent by the communication host;
the standby host and the communication host communicate by adopting a Modbus protocol; the step of recognizing that the received first data is a request message sent by the communication host includes:
the standby host judges that the data length of the first data is greater than or equal to 8 bytes, the first data is in a bus mode currently, the target address of the first data is not 0, the function code of the first data is 1 or 2 or 3 or 4, the same request message exists in a local request list, the checksum of the first data is legal, and the first data is determined to be the request message sent by the communication host.
5. The diagnostic device of claim 4, wherein the identification module is specifically configured to:
when a diagnosis period comes, executing the first data received through the serial bus, and identifying that the received first data is a request message sent by a communication host; and receiving the second data through the serial bus, and recognizing that the received second data is a response message sent by the slave station.
6. The diagnostic device of claim 4, wherein the identification module is specifically configured to:
receiving first data through a serial bus for N times continuously, and identifying the received first data as a request message sent by a communication host; receiving second data through a serial bus, and identifying that the received second data is a response message sent by a slave station; wherein N is an integer greater than or equal to 1;
the diagnostic module is specifically configured to:
and diagnosing the communication state between the master station and the slave station according to the last identified request message and response message.
7. A backup host comprising a processor and a computer readable storage medium having instructions stored thereon, wherein the instructions, when executed by the processor, carry out the steps of the diagnostic method according to any one of claims 1 to 3.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the diagnostic method according to any one of claims 1 to 3.
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| CN111159089B (en) * | 2019-12-30 | 2022-03-29 | 北京和利时系统集成有限公司 | Equipment communication method and system under redundant host link collision mode |
| CN111586182B (en) * | 2020-05-11 | 2023-06-06 | 北京和利时系统集成有限公司 | Data transmission method and device |
| CN112015163B (en) * | 2020-08-20 | 2021-11-26 | 广州汽车集团股份有限公司 | Method and device for quickly identifying diagnostic subject on CAN bus |
| CN114142619B (en) * | 2021-12-28 | 2024-04-19 | 广东电网有限责任公司 | Overhauling determining method and device for telemechanical device |
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| CN103001867A (en) * | 2012-12-27 | 2013-03-27 | 中航(苏州)雷达与电子技术有限公司 | Host-standby machine duplicated hot-backup system and method |
| CN105007197A (en) * | 2015-07-29 | 2015-10-28 | 南车株洲电力机车研究所有限公司 | Method and device for monitoring communication state of MVB bus |
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