JP2003196114A - Management and confirmation method for internal data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for managing a program or confirming the propriety thereof when writing the program from a personal computer through an interface by use of an on-line rewritable device as storage medium. <P>SOLUTION: In this method, an area for storing a management mark displayed on a display device to confirm the property of the rewritable device and an area for confirming the propriety by use of a control program in writing are provided. When a write-in signal from the personal computer is received, it is compared with the value calculated by the control program, the program or data is stored in the write-in area of the rewritable device when the propriety is confirmed, and the management mark of the program or data is written in the management mark storage area. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rewriting a write program or data for an online rewritable device in a digital protective relay, and more particularly to a method for managing internal data such as a write program and a method for confirming the correctness of the data. is there.

[0002]

2. Description of the Related Art Programs and fixed setting data in a digital protective relay are written in a ROM such as EPROM (hereinafter simply referred to as a rewritable device) by using a ROM writer and mounted on the protective relay. In recent years, as digital protection relays have become more sophisticated, rewritable devices that store programs and the like have changed from conventional EPROMs and the like to online rewritable devices such as flash ROMs. For this reason, in the related art, the management of the program and the like is performed by writing the program and the like into an actual product called a ROM and mounting it.

The conventional online writing after the transfer of the online rewritable device is performed by the method shown in FIG. That is, in rewriting, the online writing control program already written in the online rewritable device that is the storage destination of the program is run on another temporary storage device such as RAM, and the rewriting control program and the transmission path such as RS232C are connected. A new program is rewritten while communicating with a host PC (personal computer) connected via the computer.

[0004]

As described above, the EPR
By moving from OM to an online rewritable device such as a flash ROM, a stored object such as a program or data inside the device can be rewritten in the device mounted on the device. It has become impossible to manage with the actual ROM. Further, when the conventional online rewritable device is used, if an incorrect program, broken data, or the like is written at the time of the rewriting, normal operation may not be performed after the writing is completed, and even the online rewriting function may be lost. In such a state, a great deal of labor is usually required for restoration. Therefore, when an online rewritable device is used, there is a demand for management of programs and data written in the device and a method for confirming the validity at the time of rewriting.

The present invention has been made in view of the above points, and an object thereof is to provide an effective internal data management and data confirmation method.

[0006]

According to a first aspect of the present invention, an online rewritable device is provided as a memory, and the rewritable device is serially communicated from a personal computer through an interface and rewritable via a control program. In the case of storing programs and data in a device, an area for storing a management symbol for displaying on the display device to confirm the identity of the rewritable device and an area for confirming the correctness by the control program at the time of writing When the write signal is received from the personal computer, the value is compared with the value calculated by the control program, and the program and data are stored in the write area of the rewritable device when the validity is confirmed, and the program and data are managed. Write the symbol in the management symbol storage area Is obtained is characterized in that writing.

A second aspect of the present invention is to have an online rewritable device as a memory, and the personal computer serially communicates with the rewritable device through an interface, and the rewritable device is supplied with programs and data via a control program. In what is stored, an area in which a management symbol for displaying on a display device and confirming the identity of the rewritable device is stored,
A code area for confirming the correctness by a control program at the time of writing is provided, and a predetermined code is embedded in a fixed position of a program or data for writing to the rewritable device on the personal computer side, and the control program is transmitted from the personal computer. When the signal is received, the predetermined code is confirmed, and when the validity is confirmed, the program or data is stored in the writing area of the rewritable device, and the management symbol of the program or data is written in the management symbol storage area. It was done.

A third aspect of the present invention is to provide an area for confirming the correctness by a control program at the time of writing the program or the device in the rewritable device, and the control program is provided when the write signal is received from the personal computer. It is characterized in that the program and data are stored in the writing area of the rewritable device at the time of confirmation of validity by comparing with the calculated value.

A fourth aspect of the present invention is characterized in that a management symbol, a legitimacy confirmation symbol and a predetermined code number stored in each area of the rewritable device are displayed on a display device.

A fifth aspect of the present invention is to confirm the correctness of the program and data to be confirmed after being stored in the rewritable device by using a checksum or CRC confirmation means.
If a rewritable device is provided with a storage area for storing this confirmation calculated value, and a confirmation calculation is executed periodically using the calculated value stored in this calculated value storage area, and the previous value and the current value are different The feature is that the validity is judged by repeating a plurality of times.

In a sixth aspect of the present invention, a correctness presence / absence calculation is performed by doubling the storage area of the confirmation target program or data stored in the rewritable device, the calculated value storage area, and the validity confirmation means area. However, when it is not possible to guarantee the correctness of the program or data in any of the confirmation target areas, the characteristic is to restore the program or data from the area on the side of ensuring the correctness.

[0012]

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes an online rewritable device such as a flash ROM incorporated in a device such as a digital protective relay. In this device, an area 11 in which programs and data are stored and an area 12 in which management symbols are written.
And a validity confirmation area 13 and a control program storage area (not shown). 2 is the host PC,
3 is an interface for serial transfer, RS232C
Etc. are used. A change program or a completely new program is written in the storage area 11 for programs and the like, and a ROM name and a management number are written in the management symbol area 12, and the management symbol is displayed on the display device. It is used to confirm the identity of the written content. The correctness confirmation area 13 has a checksum or CRC (Cyclic Redundancy Ch
eck) confirmation means is embedded and used to confirm the correctness by the control program at the time of writing.

As a method for confirming the correctness of the program to be written and the data, the checksum of the program or the like is fixed at a fixed position (address) of the program or the like to be written to the online rewritable device 1 on the host PC side. Or CRC) is calculated and embedded. When the control program on the device side receives the program to be written or the like from the host PC 2 via the interface 3, the control program side calculates the checksum and compares it with this calculated value to judge its validity. As a result of the determination, the control program writes the program and the like in the area 11 only when the correctness is confirmed.

Next, for management of the written programs and data, the host PC 2 side embeds the names and management numbers of the programs and data in the programs and data to be written. On the receiving side device (digital protection relay side), display is made using a display device such as a numerical display or liquid crystal display to clarify the features of the internal program and data to the operator. Therefore, the operator can confirm the feature of the displayed internal program and can judge whether or not it is the intended writing result.

FIG. 2 shows a second embodiment, in which the management symbol storage area 1 is provided in the online writable device 1.
In addition to 2, the predetermined code storage area 14 is provided. On the host PC 2 side, a predetermined code is embedded in a fixed position of a program or data to be written in the rewritable device 1. The control program recognizes a predetermined code in advance, and when the program to be written or data from the host PC 2 is received, the code is confirmed and the validity is judged. Others are the same as those shown in FIG.

FIG. 3 shows a third embodiment, which is the same as the embodiment shown in FIG.
The area 13 is provided. Therefore, in this case, the checksum (or CRC) of the program and data including the code is calculated and embedded. When receiving the program to be written from the host PC 2 side, the control program compares the predetermined code and its checksum with the value calculated on the control program side to judge the validity. Only when the correctness is confirmed, the control program rewrites a new program or the like in the device area 11. The management method is the same as in the embodiment of FIG.

FIG. 4 shows a fourth embodiment. In this example, the confirmation method according to any one of the first to third embodiments (here, the third embodiment) is added to the confirmation method by the operator. It is a combination of confirmations. That is, just as in the third embodiment, the correctness is confirmed on the host PC side and the control program side. After confirming the correctness, the control program displays the name of the program, management number, checksum value, etc. using the display device 4 such as a numerical display or liquid crystal display, and requests the operator's reconfirmation. . The operator indicates the intention of the confirmation result with some input device such as an input switch, and only when the result is affirmed, the control program rewrites the area 11. The management method is the same as in FIG.

According to each of the above-described embodiments, it is possible to rewrite the inside of the online rewritable device while preventing functional destruction of the existing program and the like.
Although it becomes easy to manage written data and programs, there is a possibility that data may be destroyed due to program runaway during use.

FIG. 5 shows a fifth embodiment, in which the checksum of the area 13 or the CRC is used to detect data corruption in the rewritable device 1. As described above, the rewritable device stores a program and data whose validity has been confirmed, and the checksum at that time is calculated and stored in the calculated value storage area 15. Note that the calculation target does not include the area 13.

FIG. 6 is a flow chart for confirming the validity. The validity check is periodically executed. In step S1, it is judged that the calculation time has come, and when the predetermined time comes, the rewritable device The area 11 is calculated (step S2). In step S3, the validity is determined by comparing the previous calculated value stored in the calculated value storage area 15 with the value calculated this time. As a result of the judgment, if the correctness is guaranteed, the process ends as it is, but if it is judged that the correctness is not guaranteed, the process proceeds to step S4, and a checksum is calculated for a plurality of predetermined reconfirmations. It is determined whether or not has been repeated. If the predetermined number of times is insufficient, the process returns to step S2 to perform the calculation, and if the predetermined number of times of confirmation is performed, external output is performed in S5,
Data damage in the rewritable device is detected by displaying an alarm using a method such as LED display.

FIG. 7 shows a sixth embodiment, which is for detecting the recovery of damaged data in a rewritable device and the time when recovery is not possible. This embodiment corresponds to duplication of the target data in FIG. 5, and includes a storage area 11a for the original data and an area 1 for copying and saving the original data.
1b, the checksum calculated value storage areas 15a and 15b in each area and the checksum or CR
It has C regions 13a and 13b. The legitimacy confirmation on the original data side and the copy side is separately performed based on the flowchart shown in FIG. 6 to judge the validity of the legitimacy.
As a result of the judgment, when the situation in which the correctness cannot be guaranteed occurs in either the area 11a or 11b, the data is restored from the area on the side where the correctness is guaranteed. In addition, the area 11
When it is determined that both the data a and 11b are not valid, reconfirmation is repeated a plurality of times, and an alarm is displayed to the effect that the validity cannot be guaranteed.

[0022]

As described above, according to the present invention, it is possible to manage the data and the like written in the online rewritable device that cannot be physically managed, and after confirming the correctness at the time of writing the data and the like. Since the rewriting is performed, it is possible to prevent the destruction of the function of the existing program or the like due to the writing of the broken program or the like. In addition, in case of unexpected data corruption inside the device due to program runaway, etc., the correctness of all or part of the rewritable area can be confirmed periodically, and in the unlikely event of data corruption. Can detect and recover it.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 6 is a flowchart of data corruption detection processing according to the embodiment of the present invention.

FIG. 7 is a configuration diagram showing a sixth embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a conventional rewriting method.

[Explanation of symbols]

1. Rewritable device 2 ... Host PC 3 ... Interface 4 ... Display device 11 ... Rewriting target area 12 ... Control symbol area 13 ... Validation area 14 ... Code area 15: Calculated value storage area

Claims (6)

[Claims] 1. A device having an online rewritable device as a memory, serially communicating with the rewritable device through an interface from a personal computer, and storing a program or data in the rewritable device via a control program, An area for storing a management symbol for displaying on a display device to confirm the identity of the rewritable device and an area for confirming the correctness by a control program at the time of writing are provided, and a write signal is received from the personal computer. Sometimes
Comparing with a value calculated by the control program, the program and data are stored in the write area of the rewritable device at the time of confirmation of validity, and the management symbol of the program or data is written in the management symbol storage area. How to manage and confirm the internal data you have provided. 2. A device having an online rewritable device as a memory, serially communicating with the rewritable device through an interface from a personal computer, and storing a program or data in the rewritable device via a control program, An area for storing a management symbol for displaying on the display device to confirm the identity of the rewritable device and a code area for confirming the correctness by the control program at the time of writing are provided, and the rewriting is performed on the personal computer side. A predetermined code is embedded in a fixed position of a program or data to be written in the rewritable device, and the control program confirms the predetermined code when a signal is received from a personal computer, and confirms the program or the data of the rewritable device when the validity is confirmed. Writing A method of managing and confirming internal data, characterized in that the management code of the program or data is stored in the storage area and the management code of the program or data is written in the management code storage area. 3. An area for confirming correctness is provided by a control program when writing a program or device to the rewritable device, and compared with a value calculated by the control program when a write signal is received from the personal computer. The internal data management / confirmation method according to claim 2, wherein the program and the data are stored in the writing area of the rewritable device at the time of confirming the correctness. 4. The management of internal data according to claim 1, wherein a management symbol, a validity confirmation symbol and a predetermined code number stored in each area of the rewritable device are displayed on a display device. ·Confirmation method. 5. The rewritable device is a rewritable device for confirming the correctness of a confirmation target program and data after being stored in the rewritable device by a confirmation means by a checksum or CRC, and storing the confirmation calculated value. It is characterized in that the calculation value stored in this calculated value storage area is used to periodically perform a confirmation calculation, and if the previous value and the current value are different, multiple times are repeated to determine the validity. 5. The internal data management / confirmation method according to claim 1. 6. A correctness presence / absence calculation is performed by duplicating a storage area for a confirmation target program or data stored in the rewritable device, a calculated value storage area, and a validity checking means area, and executing the validity checking operation. 7. The internal data management / verification method according to claim 6, wherein if the correctness of the program or data cannot be guaranteed in the confirmation target area, the program or data is restored from the area on the side of ensuring the correctness.