CN114003936A - Method for downloading downtime data in online authorization manner - Google Patents

Abstract

A method for online authorization to download downtime data. After the downtime is restarted, the security control system adopts an automatic download communication authorization method to perform communication authorization with an external device, the security control system establishes a communication channel with the external device, and the security control system is online to the external device. The device sends outage data. The invention enables the railway signal control system to have the ability to obtain information about downtime online, ensures the safe and reliable operation of the system, reduces the error rate and prolongs the service life of the hardware.

Description

A method for online authorization to download downtime data

technical field

The present invention relates to a method for online authorization to download crash data.

Background technique

The railway signal safety platform is a general fail-oriented safety computer control system, which is applied to the key core equipment of the railway signal control system. After the railway signal control system is put into use, it will inevitably encounter unexpected situations of downtime due to insufficient communication performance and software defects. Backup the downtime information and save the fault data on-site for subsequent fault analysis. After the data is retained, the normal operation of the equipment can be quickly restored, and the impact on the field operation after the downtime is minimized. At present, the main way to download downtime information is offline download by the on-site staff using the programmer, which has the following problems:

1. The offline download operation is cumbersome and affects the operation of the device.

2. The downtime memory will be overwritten, and only the latest downtime information can be obtained.

3. There is an error rate in manual operation, which is easy to cause damage to the hardware pins.

4. The number of on-site running boards is large, and the cabinet space is limited, so it is not easy to connect the writer.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for online authorization to download downtime data, so that the railway signal control system has the ability to obtain downtime information online, ensures the safe and reliable operation of the system, reduces the error rate, and prolongs the service life of hardware.

In order to achieve the above object, the present invention provides a method for online authorization to download downtime data. After the downtime is restarted, the security control system adopts an automatic download communication authorization method to perform communication authorization with an external device, and the security control system establishes communication with the external device. channel, the safety control system sends the downtime data to the external device online.

The communication protocol used for communication authorization and data transmission between the security control system and the external device is the standard TFTP protocol.

The automatic download communication authorization method includes:

The security control system and the external device agree on the first data to be encrypted and the second data to be encrypted;

The security control system sends a read request to the external device, and the file name corresponding to the read request includes a key, and the key is calculated from the first to-be-encrypted data through an encryption algorithm;

After the external device receives the read request sent by the security control system, it verifies the key value in the file name, and after the verification passes, it replies to the data packet calculated by the encryption algorithm from the second data to be encrypted;

After the security control system receives the data packet sent by the external device, it verifies the correctness of the data, and if the verification passes, it sends a confirmation packet to the external device.

The encryption algorithm adopts the DES encryption algorithm.

After the security control system fails to perform the communication authorization with the external device by using the automatic download communication authorization method, the security control system uses the manual download communication authorization method to perform the communication authorization with the external device.

The manual download communication authorization method includes:

The external device sends a read request to the security control system, and the security control system replies the authorization protocol version number to the external device after receiving the read request sent by the external device;

The external device sends a write request to the security control system, and the file name corresponding to the write request contains the version number of the authorization protocol. After the security control system receives the write request sent by the external device, it verifies whether the version number of the authorization protocol in the file name is correct. , after the verification is passed, reply the confirmation packet to the external device;

After the external device receives the confirmation packet sent by the security control system, it sends the CPU identification number data packet to the security control system. After the security control system receives the CPU identification number data packet sent by the external device, it verifies the CPU carried in the CPU identification number data packet. If the identification number is correct, if the verification is passed, a confirmation packet will be sent to the external device, allowing the external device to establish communication with the safety control system.

The method for establishing a communication channel between the safety control system and an external device includes:

The external device sends a request to the security control system to read the channel number, and the target processor returns the channel number to the external device after passing the verification;

The external device sends a request to the target processor to read the download service version number, and the target processor replies with the download service version number.

The method for the safety control system to send downtime data to an external device online includes:

When the security control system receives the "initialized read" write request file sent by the external device, it verifies the file information and saves the address and size data sent by the external device;

When the security control system receives the read request file of "obtaining the operation mode of initial reading" sent by the external device, it verifies the file information, and replies the operation mode of initial reading to the external device. If the operation mode is available, the external device continues to execute next steps;

When the security control system receives the read request file of "read data" sent by the external device, it verifies the file information, and performs data transmission according to the address and size sent by the external device.

The downtime data includes electronic stamp information, downtime flags and downtime information;

The electronic stamp information contains at least an error-proof code and CRC information;

The downtime flag indicates whether downtime information exists.

The method for downloading the electronic stamp information includes:

The external device sends a write request to the security control system, requesting to write the starting address and size of the electronic stamp information, the file name corresponding to the write request includes the download service version number and channel number, and the security control system receives the message sent by the external device. Write request, if the verification is passed, save the written data and reply the confirmation packet to the external device;

The external device sends a read request to the security control system, requesting the read request to write the starting address and size of the electronic stamp information. The file name corresponding to the read request contains the download service version number and channel number. The security control system Reply the operating mode to the external device;

After receiving the mode availability reply sent by the security control system, the external device sends a read request to the security control system to request to read the electronic stamp information. The file name corresponding to the read request contains the download service version number and channel number. The security control system Reply the electronic stamp information to the external device according to the starting address and size of the stored electronic stamp information.

The method of downloading the downtime flag includes:

The external device sends a write request to the security control system, requesting to write the starting address and size of the downtime flag, the file name corresponding to the write request includes the download service version number and channel number, and the security control system receives the message sent by the external device. Write request, if the verification is passed, save the written data and reply the confirmation packet to the external device;

The external device sends a read request to the security control system, requesting the read request to write the start address and size of the downtime flag. The file name corresponding to the read request includes the download service version number and channel number. The security control system Reply the operating mode to the external device;

After receiving the mode availability reply sent by the security control system, the external device sends a read request to the security control system to request to read the downtime flag. The file name corresponding to the read request contains the download service version number and channel number. The security control system The downtime flag is returned to the external device according to the saved start address and size of the downtime flag.

The method of downloading the downtime information includes:

The external device sends a write request to the security control system, requesting to write the starting address and size of the downtime information. The file name corresponding to the write request includes the download service version number and channel number. The security control system receives the message sent by the external device. Write request, if the verification is passed, save the written data and reply the confirmation packet to the external device;

The external device sends a read request to the security control system to request the read request to write the start address and size of the downtime information. The file name corresponding to the read request contains the download service version number and channel number. The security control system Reply the operating mode to the external device;

After receiving the mode availability reply sent by the security control system, the external device sends a read request to the security control system to request to read the downtime information. The file name corresponding to the read request contains the download service version number and channel number. The security control system Reply the downtime information to the external device according to the start address and size of the saved downtime information.

After the download of the downtime data is completed, the safety control system cancels the communication authorization with the external device.

The method for canceling the communication authorization includes: after the security control system receives the cancellation authorization request sent by the external device, cancels the communication authorization with the external device, or the security control system does not receive the cancellation authorization sent by the external device within the set time. request, the safety control system automatically cancels the authorization of communication with the external device.

The security control system includes a plurality of target processors, each target processor executes communication authorization with a plurality of external devices, establishing communication channels and downloading data.

The target processor simultaneously establishes multiple communication channels with external settings.

The present invention has the following advantages:

1. The remote control method can download the downtime information through the external network port reserved on the security control system without disassembling the high-enclosed equipment, and has strong versatility.

2. The automatic download method achieves active backup of each downtime data without omitting important information.

3. Download the downtime information remotely through the network, without affecting the safe data communication, to ensure the safe and reliable operation of the system, which is more convenient and reliable than offline acquisition.

4. There is no need to manually intervene in the on-site environment, reduce the error rate, prolong the service life of hardware, and save hardware costs.

Description of drawings

FIG. 1 is a flowchart of a method for online authorization to download crash data in an embodiment of the present invention.

FIG. 2 is a flow chart of selecting an online communication authorization method for communication authorization.

FIG. 3 is a flowchart of a method for online downloading of downtime information.

Detailed ways

Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3 .

As shown in FIG. 1, in an embodiment of the present invention, a method for online authorization to download crash data is provided, which includes six stages: the first stage, requesting communication authorization; the second stage, requesting to open a channel; In the first stage, the electronic stamp information is requested; in the fourth stage, the downtime flag is requested; in the fifth stage, the downtime information is requested; in the sixth stage, the communication authorization is cancelled.

In the first stage, an authorization service based on the standard TFTP protocol is provided. The TFTP message format is opcod|sourcefile|type, where opcod is divided into read request and write request, source file is the file name, and type is octet (TFTP value of the Type field in the message). There are two communication authorization methods, namely, manual download authorization (external device (PC) requests authorization) and automatic download authorization (safety control system (that is, "railway signal control system") requests authorization).

After the safety control system restarts from a shutdown, it first uses the automatic download method to send the downtime information to the external device, and saves the downtime information at the first time. If the automatic download fails, the manual download method is used.

As shown in Figure 2, selecting a communication authorization method for communication authorization includes the following steps:

Step 1. The safety control system firstly performs system initialization;

Step 2. The security control system checks whether there is a downtime setting, if yes, go to Step 3, if not, go to Step 6;

Step 3. The security control system checks whether automatic download has been performed. If so, go to Step 6. If not, go to Step 4;

Step 4, the security control system executes automatic download communication authorization;

Step 5. The security control system confirms the identity of the external device by relying on whether the encryption algorithm has passed the verification, thereby judging whether the automatic download communication authorization is successful, if so, the second stage can be performed, if not, step 6;

Step 6, the security control system performs other communication tasks, and then proceeds to Step 7;

Step 7, the security control system judges whether the authorization request sent by the external device is received, if yes, go to step 8, if not, go to step 6;

Step 8, the external device performs manual download communication authorization;

Step 9: The security control system verifies whether the TFTP request sent by the external device is correct, so as to determine whether the manual download communication authorization is successful.

In the step 4, in the automatic download mode, the security control system actively initiates a download request. In order to ensure communication security, before requesting communication authorization, the security control system relies on an encryption algorithm to confirm the identity of the external device. In this embodiment, the encryption algorithm adopts DES encryption algorithm, the way to confirm the identity is whether the encryption algorithm has passed the verification, and it means that the other party is a safe and trusted device.

The method for automatically downloading communication authorization includes the following steps:

The target processor in the security control system and the external device agree on two 8-byte data to be encrypted, and the security control system sends a read request to the external device. The file name corresponding to the read request is "download_mode" + "CPU ID" + " "Key", where "download_mode" represents the download mode, used to distinguish between manual download and automatic download, "key" is calculated from the data to be encrypted 1 through the DES encryption algorithm, and the data to be encrypted The processor and the external device) negotiate and determine;

After receiving the read request sent by the security control system, the external device verifies the key value in the file name. After the verification is passed, it replies to the data packet calculated by the DES encryption algorithm from the data to be encrypted 2. The data to be encrypted 2 Determined through negotiation between the two communicating parties (ie, the target processor and the external device);

After the security control system receives the data packet sent by the external device, it verifies the correctness of the data. If the verification is passed, it sends a confirmation packet to the external device, otherwise it sends an error packet to the external device.

The method for manually downloading communication authorization includes the following steps:

The external device sends a read request to the target processor (CPU) in the security control system, and the file name corresponding to the read request is "atr_information"; after receiving the read request sent by the external device, the target processor replies to the authorization protocol version number to For the external device, the authorization protocol version number is used as a part of the file name of the subsequent authorization request of the external device, and the function is to ensure the authenticity and reliability of the external device and prevent the authorization of unintended devices;

The external device sends a write request to the target processor, and the file name corresponding to the write request is "atr_vxxx_authorize", where vxxx is the version number of the authorization protocol; after receiving the write request sent by the external device, the target processor verifies the file Whether the name is correct, after the verification is passed, reply the confirmation packet to the external device;

After receiving the acknowledgment packet sent by the target processor, the external device sends the CPU identification number data packet to the target processor; the target processor checks the message to check whether the CPU identification number carried in the CPU identification number packet is consistent with the target processor. If it passes, it will reply the confirmation packet to the external device, allowing the external device to establish communication with the safety control system. If the check fails, then send an error packet to the external device.

Each CPU in the security control system manages a certain number of different external devices to request authorization. If the number exceeds this number, the newly applied external device replaces the initially applied external device to improve resource utilization.

In the second stage, the method for requesting to open a channel consists of the following steps:

The external device sends a request to read the channel number to the target processor in the security control system, and the target processor returns the channel number "channelID" to the external device after passing the verification; the channel number is used as part of the subsequent request file name for security purposes. The platform verifies the identity of remote external devices to ensure the security of data transmission; the target processor can open multiple channels at the same time, download downtime information and other security information, realize function expansion and improve communication efficiency;

The external device sends a request to the target processor to read the download service version number, and the target processor replies with the download service version number "vxxx"; the download service version number "vxxx" is part of the file name of the subsequent request from the external device.

The security control system can download the downtime information only after allowing the external device to authorize the communication, so as to avoid the leakage of the security information and ensure the security of the data communication. The two parties agree to read the address and size of the memory, and use the TFTP protocol for block transmission. Compared with the traditional UDP communication, the TFTP protocol ensures the integrity of the data in the case of large-capacity communication, and avoids invalidation caused by errors in the middle of the download. Download, improved transmission stability.

After the authorization is successful and the communication channel is opened, the download process starts, including the third stage, the fourth stage and the fifth stage. The processing flow chart of each stage is shown in Figure 3. The online download method of downtime information includes the following steps:

Step 1. When the target processor in the security control system receives the "initialized read" write request file sent by the external device, it verifies the file information and saves the data sent by the external device, including the read address and size;

Step 2. When the target processor in the security control system receives the read request file of "obtaining the operation mode of initialization read" sent by the external device, it verifies the file information and replies to the current operation mode. If the current operation mode is available, the external The device can proceed to the next steps;

Step 3: When the target processor in the security control system receives the read request file of "read data" sent by the external device, it verifies the file information, and performs data transmission according to the address and size saved in step 1.

Specifically, in the third stage, the method for requesting electronic stamp information specifically includes the following steps:

Step 301: The external device sends a write request of "dld_vxxx_w" + "channelID" + "PAL" to the target processor, requesting to write the starting address and size of the electronic stamp information, and the target processor receives the request and checks the correctness of the request and data If the verification is passed, the written data will be saved and the confirmation package will be replied, otherwise the download will be terminated.

Step 302, the external device sends a read request of "dld_vxxx_m" + "channelID" to the target processor, requesting to read the operation mode in step 301, the target processor replies with the operation mode, and the status value is divided into Initialize, Enable, Disable, Error.

Among them, Initialize means initialization, Enable means that you can continue to send the next request, Disable means that the request needs to be resent, and if it is still unavailable after resending a certain number of times (can be set by the user, the default is 3 times), it will reply Error and end sending follow-up request.

Step 303: The external device sends a read request of "dld_vxxx_u" + "channelID" to the target processor, requesting to read the electronic stamp information, and the target processor replies the electronic stamp information of the target processor according to the starting address and size saved in step 301.

The electronic stamp contains error-proof code, CRC and other hardware information, so that the software and hardware storage areas are separated and the reading efficiency is improved. Download the electronic stamp information to analyze the hardware status. Combined with the downtime information, you can analyze the failure caused by the hardware.

In the fourth stage, the method of requesting the downtime flag specifically includes the following steps:

Step 401: The external device sends a write request of "dld_vxxx_w"+"channelID"+"SRL" to the target processor, requesting to write the start address and size of the downtime flag, and the downtime flag indicates whether downtime information exists. The target processor receives the request, checks the correctness of the request and the data, and if the verification passes, saves the written data and replies with a confirmation packet; otherwise, the download ends.

Step 402, the external device sends a read request of "dld_vxxx_m" + "channelID" to the target processor, requesting to read the state of the operation in step 401, and the target processor replies with the operation state value.

Step 403 , the external device sends a read request of "dld_vxxx_u" + "channelID" to the target processor, requesting to read the downtime flag, and the target processor replies to the downtime flag of the target processor according to the start address and size saved in step 401 . The downtime flag determines whether subsequent stages are performed, and the acquisition of the downtime flag stage improves the effectiveness of the download process.

In the fifth stage, the method for requesting downtime information specifically includes the following steps:

Step 501: The external device sends a write request of "dld_vxxx_w"+"channelID"+"MEM" to the target processor, requesting to write the start address and size of the downtime information, and the target processor saves the written data and replies with an acknowledgement packet. The downtime information contains the software stack information of the target processor at the time of downtime.

Step 502, the external device sends a read request of "dld_vxxx_m"+"channelID" to the target processor, requesting to read the status of the operation in step 501, and the target processor replies with the operation status value.

Step 503 , the external device sends a read request of "dld_vxxx_u" + "channelID" to the target processor, requesting to read the downtime information, and the target processor replies the downtime information of the target processor according to the start address and size saved in step 501 .

Due to the large amount of downtime information data, it is transmitted in segments. The maximum size of each segment is 0x4000 bytes, and the maximum size of each packet is 512 bytes. The block number of the data packet ensures the integrity of the data. The first 2 bytes of each segment of data Store the complete flag of the downtime information of this segment to ensure that the data in each segment of the download process is valid. After a segment of data transmission is completed, if the transmission is not completed, go to step 501, and the starting address is increased by 0x4000.

Among them, "dld" is the abbreviation of download service, PAL, SRL, and MEM are memory areas, and w, m, and u represent different operations.

By analyzing the downtime information and locating the downtime failure points caused by the software, software defects are found and repaired to ensure the normal operation of the security control system.

After the download process is complete, the communication authorization should be revoked. In addition to the method of canceling the communication authorization initiated by the external device, the security control system will also set a timer. When the automatic download method is used or the cancellation request sent by the external device is not received within a certain period of time, the security control system automatically cancels the authorization of the external device. Communication authorization provides double guarantee for system security.

In the sixth stage, the method of deauthorizing the communication consists of the following steps:

Step 601: The external device sends a write request to the target processor, and the corresponding file name is "atr_vxxx_unauthorize", where vxxx is the version number of the authorization protocol in the manual download mode. After receiving the write request, the target processor verifies whether the file name is correct , and reply the confirmation packet after the verification is passed.

Step 602: After receiving the confirmation packet sent by the target processor, the external device sends the CPU identification number to the target processor, the target processor verifies the message and replies with the confirmation packet, and cancels the establishment of communication between the external device and the security control system.

The present invention has the following advantages:

1. The remote control method can download the downtime information through the external network port reserved on the security control system without disassembling the high-enclosed equipment, and has strong versatility.

2. The automatic download method achieves active backup of each downtime data without omitting important information.

3. Download the downtime information remotely through the network, without affecting the safe data communication, to ensure the safe and reliable operation of the system, which is more convenient and reliable than offline acquisition.

4. There is no need to manually intervene in the on-site environment, reduce the error rate, prolong the service life of hardware, and save hardware costs.

It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments, rather than indicating or implying that the indicated devices or elements must have The particular orientation, construction and operation in the particular orientation are therefore not to be construed as limitations of the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

While the content of the present invention has been described in detail by way of the above preferred embodiments, it should be appreciated that the above description should not be construed as limiting the present invention. Various modifications and alternatives to the present invention will be apparent to those skilled in the art upon reading the foregoing. Accordingly, the scope of protection of the present invention should be defined by the appended claims.

Claims (16)

1. A method for downloading downtime data in an online authorization mode is characterized in that after downtime is restarted, a safety control system executes communication authorization with external equipment by adopting an automatic download communication authorization method, the safety control system and the external equipment establish a communication channel, and the safety control system sends downtime data to the external equipment in an online mode.

2. The method for authorizing download of downtime data online as claimed in claim 1, wherein the communications protocol employed for communications authorization and data transmission between the security control system and the external device is the standard TFTP protocol.

3. The method of authorizing download of downtime data online as claimed in claim 2, wherein said method of automatically downloading communications authorization comprises:

the security control system and the external equipment agree on first data to be encrypted and second data to be encrypted;

the method comprises the steps that a security control system sends a reading request to external equipment, a file name corresponding to the reading request comprises a secret key, and the secret key is obtained by calculating a first data to be encrypted through an encryption algorithm;

after receiving a reading request sent by the security control system, the external device verifies a key value in the file name, and replies a data packet obtained by computing the second data to be encrypted through an encryption algorithm after the verification is passed;

and after receiving the data packet sent by the external equipment, the safety control system checks the correctness of the data, and sends a confirmation packet to the external equipment if the check is passed.

4. The method of authorizing download of the downtime data online of claim 3, wherein the encryption algorithm employs a DES encryption algorithm.

5. The method of authorizing download of the downtime data online as claimed in claim 2, wherein the security control system performs the authorization for communications with the external device using the manual download communication authorization method if the security control system fails to perform the authorization for communications with the external device using the automatic download communication authorization method.

6. The method of authorizing download of downtime data online as claimed in claim 5, wherein said manual download communications authorization method comprises:

the method comprises the steps that the external equipment sends a reading request to a safety control system, and the safety control system replies an authorization protocol version number to the external equipment after receiving the reading request sent by the external equipment;

the method comprises the steps that an external device sends a write request to a security control system, a file name corresponding to the write request comprises an authorization protocol version number, after the security control system receives the write request sent by the external device, whether the authorization protocol version number in the file name is correct or not is verified, and a confirmation packet is replied to the external device after verification is passed;

after receiving the confirmation packet sent by the safety control system, the external equipment sends a CPU identification number data packet to the safety control system, after receiving the CPU identification number data packet sent by the external equipment, the safety control system verifies whether the CPU identification number carried by the CPU identification number data packet is correct, and if the verification is passed, the external equipment replies the confirmation packet to the external equipment to allow the external equipment to establish communication with the safety control system.

7. The method of authorizing download of downtime data online as claimed in claim 1, wherein the method for the security control system to establish a communication channel with an external device comprises:

the external equipment sends a request to the security control system to read the channel number, and the target processor replies the channel number to the external equipment after passing the verification;

the external device sends a request to the target processor to read the version number of the downloading service, and the target processor replies the version number of the downloading service.

8. The method for authorizing the download of the downtime data online according to claim 1, wherein the method for the security control system to send the downtime data online to the external device comprises:

when a write request file of 'initialization reading' sent by external equipment is received in a safety control system, file information is verified, and address and size data sent by the external equipment are stored;

when the security control system receives a read request file of 'obtaining an operation mode for initializing reading' sent by the external equipment, checking file information, replying the operation mode for initializing reading to the external equipment, and if the operation mode is available, continuing to execute the subsequent steps by the external equipment;

when the safety control system receives a read request file of 'read data' sent by the external equipment, the file information is verified, and data transmission is carried out according to the address and the size sent by the external equipment.

9. The method of authorizing the download of downtime data online of claim 8, wherein the downtime data includes timestamp information, a downtime flag, and downtime information;

the electronic stamp information at least comprises an error-proof code and CRC information;

and the downtime sign indicates whether the downtime information exists or not.

10. The method of authorizing download of downtime data online of claim 9, wherein the method of downloading the electronic stamp information comprises:

the method comprises the steps that an external device sends a write request to a security control system to request for writing in a starting address and a size of electronic stamp information, a file name corresponding to the write request comprises a download service version number and a channel number, the security control system receives the write request sent by the external device, and if the write request passes verification, written data are stored and a confirmation packet is replied to the external device;

the method comprises the steps that the external equipment sends a reading request to a safety control system, the reading request is requested to be written into an operation mode of a starting address and size of electronic stamp information, a file name corresponding to the reading request comprises a downloading service version number and a channel number, and the safety control system replies the operation mode to the external equipment;

and after receiving the mode available reply sent by the security control system, the external equipment sends a reading request to the security control system to request for reading the electronic stamp information, wherein the file name corresponding to the reading request comprises a downloading service version number and a channel number, and the security control system replies the electronic stamp information to the external equipment according to the start address and the size of the saved electronic stamp information.

11. The method of authorizing downloading the downtime data online of claim 9, wherein the method of downloading the downtime flag comprises:

the external equipment sends a write request to the safety control system to request to write in the initial address and the size of the downtime sign, the file name corresponding to the write request comprises a download service version number and a channel number, the safety control system receives the write request sent by the external equipment, and if the write request passes the verification, the written data is stored and a confirmation packet is replied to the external equipment;

the external equipment sends a read request to the safety control system, the read request is requested to be written into an operation mode of the initial address and the size of the downtime sign, a file name corresponding to the read request comprises a downloading service version number and a channel number, and the safety control system replies the operation mode to the external equipment;

and after receiving the available mode reply sent by the safety control system, the external equipment sends a reading request to the safety control system to request for reading the downtime sign, wherein the file name corresponding to the reading request comprises a downloading service version number and a channel number, and the safety control system replies the downtime sign to the external equipment according to the initial address and the size of the saved downtime sign.

12. The method of authorizing downloading the downtime data online according to claim 9, wherein the method of downloading the downtime information comprises:

the external equipment sends a write request to the safety control system to request to write in the initial address and the size of the downtime information, the file name corresponding to the write request comprises a download service version number and a channel number, the safety control system receives the write request sent by the external equipment, and if the write request passes the verification, the written data is stored and a confirmation packet is replied to the external equipment;

the external equipment sends a read request to the safety control system, the read request is requested to be written into an operation mode of the initial address and the size of the downtime information, a file name corresponding to the read request comprises a downloading service version number and a channel number, and the safety control system replies the operation mode to the external equipment;

and after receiving the mode available reply sent by the safety control system, the external equipment sends a reading request to the safety control system to request for reading the downtime information, wherein the file name corresponding to the reading request comprises a downloading service version number and a channel number, and the safety control system replies the downtime information to the external equipment according to the initial address and the size of the saved downtime information.

13. The method for authorizing download of the downtime data online as claimed in any one of claims 1 to 12, wherein the security control system cancels the authorization for communication with the external device after the download of the downtime data is completed.

14. The method for authorizing download of downtime data online as claimed in claim 13, wherein said method for canceling communication authorization comprises: after receiving the request for canceling the authorization sent by the external device, the security control system cancels the communication authorization with the external device, or if the security control system does not receive the request for canceling the authorization sent by the external device within the set time, the security control system automatically cancels the communication authorization with the external device.

15. The method for authorizing download of downtime data online as claimed in claim 14, wherein a plurality of target processors are included in the security control system, each target processor performing authorization for communication with a plurality of external devices, establishing a communication channel, and downloading data.

16. The method for authorizing download of downtime data online as claimed in claim 15, wherein the target processor simultaneously establishes a plurality of communication channels with an external arrangement.

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