JPH10187496A - Remote supervisory and control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote supervisory and control system by which the generation of down line load(DLL) data is surely managed while including the content change of DLL data as well. SOLUTION: A front end processor(FEP) is provided with a parity area for setting parity data performing exclusive OR on entire DLL data and at the time of data version chick, exclusive OR of the DLL data is found. At such a time, the parity data are compared with parity data preserved in the parity area and when this comparison shows no coincidence, DLL from a host computer is executed by clearing version information. When there is any content change in the DLL data, a data version is matched with the DLL.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring control system, and more particularly to a downline load processing system for transmitting equipment data from a host computer to a front-end processor.

[0002]

2. Description of the Related Art A remote monitoring control system transmits equipment data (information on equipment to be monitored and information on slave stations) necessary for operation of a front-end processor (FEP) from a host computer to the front-end processor through a line. That is, a down-line load (DLL) process is performed, and the front-end processor transmits and receives measurement data and control data to and from the on-site equipment and equipment to remotely monitor and control the on-site equipment and equipment.

[0003] DLL from host computer to FEP
The data is transmitted from the host computer as needed, and not one but several generations of data exist, and version information is used for managing these generations of data.

FIG. 3 shows a version management procedure. FE
When starting P or changing the operation mode of FEP, F
The version information is transmitted from the EP to the host computer, and a version check is performed to check whether the DLL data used by the host computer and the DLL data used by the FEP are the same.

[0005] If the host computer finds that the generations of the DLL data do not match by the version check,
To update and register the DLL data of the FEP to obtain a match of the DLL data. When registering this DLL data, DL
L, the equipment data is transmitted to the FEP, and the version of the DLL data is also transmitted and registered.

[0006]

In operation of the remote monitoring control system, DLL data of the host computer and FE
A requirement is that the DLL data of P match. If the data does not match, the contents of the data transmitted from the FEP to the host computer will not be correctly recognized on the host computer side.

The consistency of DLL data is managed by the version of the DLL data, and the version correctly indicates the generation of the DLL data, but the content is not guaranteed.

For example, when a part of DLL data is destroyed due to a malfunction of FEP hardware or malfunction due to noise, the version is not updated but the data is changed.

Further, DLL data is stored in a memory with a battery backup, but when the battery runs out, the contents of the memory are not guaranteed.

As described above, a situation where the area of the version information is not accidentally destroyed and a part of the data is destroyed cannot be grasped only by the version check, so that the following problem occurs.

When a part of the DLL data managed by the FEP changes, the version correctly indicates the generation, so that the host computer and the FEP use different DLL data.

This state is shown in FIG. 4, in which the DLL data and the version information of the host computer and the FEP are the same immediately after the DLL, but when the DLL data of the FEP partially changes, the host computer and the FEP are in the subsequent operation. Although the version information of the FEP matches, the DLL data differs, and even if the host computer receives the data from the FEP, the contents will not be correctly recognized.

SUMMARY OF THE INVENTION An object of the present invention is to provide a remote monitoring control system which ensures the management of the generation of DLL data including the change in the contents of DLL data.

[0014]

According to the present invention, a change in DLL data is managed by its parity check.
It is for managing the generation of DLL data, and is characterized by the following configuration.

In a remote monitoring control system for transmitting downline load data from a host computer to a front end processor in a down line load process and managing changes in the down line load data with version information of the host computer and the front end processor, The front-end processor is provided with a parity area for setting parity data obtained by performing an exclusive OR operation on the entire downline load data at the time of downline loading, and obtaining an exclusive OR operation of the downline load data at a data version check. The parity data at that time is compared with the parity data stored in the parity area, and when the comparison does not match, the version information is cleared and a download from the host computer is performed. Characterized by comprising a version management means for executing the load.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The generation management of DLL data in the present embodiment is performed as information indicating the generation of DLL data.
A parity area for the DLL data is provided separately from the version of the DLL data.

The parity area is used to set parity data obtained by performing an exclusive OR operation on the entire DLL data. When the DLL is transmitted from the host computer to the FEP, the entire DLL data is exclusively used by the FEP. The logically ORed parity data is set.

FIG. 1 shows the setting of parity data in the FEP. The DLL receives the version and the DLL data. Immediately thereafter, the parity data is obtained by exclusive OR operation of the DLL data by the FEP, and the parity data is obtained. Set to.

FIG. 2 shows a version management procedure after setting parity data in the parity area. FEP is D
The parity data is set in the parity area when the DLL data is changed by the LL, and thereafter, at the time of checking the DLL data version, which is executed periodically or in response to a request from the host computer, an exclusive OR of the current DLL data is obtained. This value (parity data A ′) is compared with the parity data A stored in the parity area.

If there is a mismatch in the parity data in this comparison, it is determined that a change has occurred in the DLL data, and the FE
P clears the version information. And FEP is
D due to version mismatch with host computer
LL is requested, and DLL is performed from the host computer.

Thus, the host computer and the FEP
And the contents of the DLL data. In addition, the operation of the parity data is also performed by the DLL, and a correct setting for the parity area is obtained.

[0022]

As described above, according to the present invention, the DLL
Since the data change is managed by the parity check, the generation management of the DLL data is performed.
Even when the content of the DLL data is changed due to a hardware abnormality or the like, the generation of the DLL data can be managed.

[Brief description of the drawings]

FIG. 1 shows parity data setting according to an embodiment of the present invention.

FIG. 2 is a version management procedure in the embodiment.

FIG. 3 shows a conventional DLL version check processing procedure.

FIG. 4 shows an example of occurrence of mismatch of DLL data in the conventional method.

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Takeshi Tsuruta Inside Meidensha 2-1-1-17 Osaki, Shinagawa-ku, Tokyo

Claims (1)

[Claims] 1. A remote monitoring control system for transmitting downline load data from a host computer to a front-end processor in a downline load process, and managing changes in the downline load data using version information of the host computer and the front-end processor. In the above, the front-end processor is provided with a parity area for setting parity data obtained by performing an exclusive OR operation on the entire downline load data at the time of downline loading, and obtaining an exclusive OR operation of the downline load data at a data version check. Then, the parity data at this time is compared with the parity data stored in the parity area, and when the comparison becomes inconsistent, the version information is cleared and a download from the host computer is performed. A remote monitoring control system comprising version control means for executing an inload.