JPS5858630A - Dma function diagnosing method of centralized control system - Google Patents

Abstract

PURPOSE:To diagnose a DMA operation through a system, and to detect an abnormal state exactly and quickly, by transmitting data stored in a master station side in advance, to a main storage device by a DMA mode, or the like. CONSTITUTION:Data stored in a master station 3 side in advance is transferred to a main storage device 5 by a DMA mode. For instance, control information to a slave station 11 is generated by a central operating unit CPU 1, is stored in the main storage device 5, and at the necessary time point, this control information is updated. Subsequently, a fetch request of contents of the main storage device 5 is sent out to a controller II 14 periodically from the master station 3, the information is read out from a stored address designated by the main storage device 5 through an extending bus 13, a controllerI12 and a memory bus 6, is inputted to the master station 3, and is turned back to a transmission processor 9 and is outputted. Subsequently, from the slave station 11, displaying information is sent out to the controller II 14 through the transmission processor 9 and the master station 3, a store address of the main storage device 5 is designated through the controllerI12, etc., and this displaying information is written.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field to which the invention pertains The present invention includes an electronic computer in a system, and uses DMA (/elect'
DMA in a centralized control system that sends and receives control information and display information by combining in memory access) mode
This invention relates to a functional diagnosis method.

(2) Prior art and its problems For example, in the centralized control of power generation and substations, control information is transmitted from a computer to a controlled station via a control center monitoring and control device, and display information is transmitted from a controlled station to a controlled station. The information is transmitted to a computer via an office monitoring and control device.

In this way, when remotely controlling multiple power generation and substations using a computer, when the number of controlled stations increases, the control information is transferred from the computer's main memory to the computer in terms of processing response speed.
It is retrieved in MA mode and periodically transmitted to the controlled station, and the display information is periodically sent to the main memory of the computer in DMA mode from the control center side monitoring and control device (hereinafter referred to as "master station") as a master station. is written in. In this case, system downs are extremely rare due to improved processing speed of computers and master stations and distributed processing, but advanced diagnostic functions are required to detect and deal with partial downs (failures). ing. Conventionally, this diagnostic function has been added with a function equivalent to 74 litices of data, but it has been added in the direction of writing information from the master station to the computer main memory or in the direction of retrieving information from the computer main memory to the master station. Anomaly detection was limited to only one direction.

Furthermore, even if an abnormality is detected, as shown in Fig. 1, the computer central processing unit (hereinafter referred to as r CPU
Since the input circuit 4 on the side of the master station 3 receives information on the detection of the abnormality via the input circuit 4 on the master station 3 side, it is impossible to provide detection feedback for each DMA transfer due to time constraints, and only long-term continuation of the abnormality can be detected.

In addition, in FIG. 1, 5 is the main memory of the computer;
6 is memory path, 7 is DMA controller, 8F111
0 (input/output) path, 9 is a transmission processing device, 10 is a transmission path,
11 is a slave station.

(3) Purpose of the Invention The object of the present invention is to provide a method for diagnosing a DMA function in a centralized control system, which allows DMA operation to be diagnosed through the system and abnormalities to be detected reliably and promptly.

(4) Structure of the invention The present invention includes an electronic computer in the system, and connects the main storage device of the electronic computer and a control center side master station in 'iDMA mode to exchange control information and display information. In a DMA function diagnosis method in a centralized control system, data previously stored in the master station online and at scheduled intervals is transferred from the master station to a scheduled area in the main storage device by DMA, and then immediately thereafter D again
The MA is characterized in that the data is read out by the MA, transferred to the master station, and the DMA function is diagnosed by determining whether it is different from the previously sent original data.

(5) Examples of the invention FIG. 2 shows a system configuration of an embodiment of the present invention.

The system of this embodiment is a CP of an electronic computer as shown in the figure.
U1, the main storage device 5, the memory path 6 connecting these, and the main storage device! A memory/protection adapter (hereinafter referred to as "Control 1") for extracting the contents of the i5 in DMA mode.
) 12, an extension path 13, and a controller II, ? A master station side adapter (hereinafter referred to as "controller ■") 14 coupled to a master station side adapter (hereinafter referred to as "controller ■") 14, and a master station 3 configured using a microcombi, Information is given through the I10 path 8 and the I10 path 8, and the control information is transmitted to a plurality of controlled station-side remote monitoring and control devices (hereinafter referred to as "slave stations") 11 via the transmission line 11. and a transmission processing device 9 that receives display information from the slave station 11.

The operation of the above configuration will be explained below.

The CPU 1 in FIG. 2 creates control information for the slave station 11, stores it in a specific area of the main storage device 5, and updates this control information when necessary. The master station 3 periodically requests the controller 114 to specify a storage address in the main memory 5 and request the controller 114 to retrieve the data.
Considering the operation timing of the PU 1, information is read from the specified storage address in the main storage device 5 via the extension path 13, the controller 12, and the memory path 6, and then the information is read out from the specified storage address in the main storage device 5 through the reverse route, that is, the memory path 6 and the controller. 12 to the master station 3 via the extension path 13 and the controller n14, performs a code check, and outputs back to the transmission processing device 9. Also, for display from the slave station 11. The information is sent from the master station transmission processing device 9 via the master station 3 to the controller 14 by designating a storage address in the main storage device 5 at a timing synchronized with the transmission cycle and issuing a write request.
In response to this, the display information is written to the specified address in the main storage device 15 via the extension path 13, the controller 112, and the memory path 6, taking into consideration the operation timing of the controller U141rlCPIJ1.

In this way, when accessing information from the master station 3 to the main storage device 5 in DMA mode, the information transfer direction is from the master station 3 to the main storage device 5 and from the main storage device i to the master station 3. It is divided into two directions, such as the direction toward the other side, and the control information and display information are each independent unidirectional information transfers.

Therefore, as shown in FIG. 3, a diagnosis-only area E7 (hereinafter referred to as the "diagnosis area") in the main storage device 5 is combined with an area E2 for storing control information and display information (hereinafter referred to as the "normal area"). For example, diagnosis information is prepared in advance in the storage circuit 31 of the master station 3 in FIG. 2 at regular intervals, and the controller [
14, the information in the memory circuit 31 is written to the diagnostic area E) in the main storage device 5, and then the stored contents of the diagnostic area E1 are written from the main memory device 5 via the controller 14 in the same way as the control information. It is taken into the memory circuit 32 of the master station 3 and calculated by the exclusive OR circuit 33, and the result is free, deflo,! At the timing when the data is input to the circuit 34 and taken into the memory circuit 32, the input take-in control signal C to the free, defro, de circuit 74 is activated, and the output of the exclusive OR circuit 33 is not 10'', that is, the main memory 5 If the information written to the main memory 5 does not match the information retrieved from the main memory 5, it means that some abnormality has occurred and the alarm output A is set to '1' and the alarm or control information is sent to the slave station. Executes processing such as stopping.

Although the above-mentioned embodiment executes diagnosis at regular intervals, when continuous information is transferred to the main storage device 5, the continuity of the information, that is, some information is transferred abnormally, so all related information is In the case of DMA writing of information that has a characteristic that makes it meaningless, it has conventionally been nearly impossible to check from the writing side, but it is now possible to perform the above-mentioned diagnosis on the information each time it is written. By executing this, it is possible to realize more advanced diagnosis. This can be easily achieved by simply increasing the capacity of the memory circuits 31 and 32 shown in FIG. 3 and setting the diagnostic area Elf to the normal area E2.

In this way, a diagnostic function can be added to DMA information transfer, which achieves advanced and high-speed processing functions through complex logic sequences, and can also be used to detect abnormalities that were previously impossible to test. , system verification can be done online, which is highly effective for systems that require extremely high reliability, such as centralized control of power generation and substations.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

For example, in the above embodiments, the diagnostic function on the parent station side was described as being implemented by hardware, but it may also be implemented by software on the parent station side.

(6) Effects of the Invention Diagnosis of DMA operation can be performed through the system, and abnormality can be detected reliably and quickly.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing the configuration of a conventional centralized control system, Fig. 2 is a system configuration diagram showing the configuration of a centralized control system according to an embodiment of the present invention, and Fig. 3 is a diagnostic function of the same embodiment. FIG. 3 is a diagram for explaining the main parts of the configuration. 1... Central processing unit (CPU), 3... Control center side monitoring and control device (master station), 4... Main storage device, 6... Memory path, 8... Input/output path (I10 pass), 9...
- Transmission processing device, 10... Transmission path, 11... Controlled station side remote monitoring and control device (slave station), 12... Memory path adapter (controller I), 13... Extension path,
14... Parent station side child suadazota (controller ■). Figure 1 Figure 2

Claims (1)

[Claims] (1) In a centralized control system that includes a computer in the system and connects the main memory of the computer and the master station of the control station in DMA (direct memory access) mode to exchange control information and display information. DM
In the function diagnosis method A, data stored in advance on the master station side is transferred online from the master station side at scheduled intervals via DMA.
The data is then transferred to a scheduled area in the main storage device, and then immediately read out again using DMA and transferred to the master station to determine whether it is different from the original data sent earlier and to diagnose the DMA function. A DMA function diagnosis method in a centralized control system, characterized in that: (2. In the DMA function diagnosis method in a centralized control system according to claim 1, the DMA function diagnosis is carried out each time information is transferred from the master station to the main storage device. DMA function diagnosis method.