JPS60696B2 - Automatic diagnosis method for distributed bus control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic diagnosis method for a distributed path control system.

One type of system in which multiple system component devices (hereinafter referred to as devices) share a single data bus to transfer data is a distributed bus control system using a distributed bus contention control method as shown in Figure 1. (hereinafter referred to as the system).

In the figure, K, to K5 are devices, which are data bus interface section (hereinafter referred to as interface section) 1.
0 to data bus B, respectively. In such a system, data bus B is provided in common to each device, so each device competes for bus occupancy requests, and the device whose bus occupancy request is accepted is granted occupancy in turn. is given. A device (for example, K) that has been granted occupancy permission sends data onto the data bus with a header portion indicating the source and content of the data. On the other hand, the other devices K2 to K use the sorting control section provided in the interface section 10 to take in what they need from the data as necessary data. When this operation is completed, the next device to which occupancy permission has been granted transmits other data in the same manner. Now, in a system that transfers data in this way, as a method of diagnosing the functions of device K and data bus B, it is possible to provide a test data transmitting and receiving device in addition to device K within the system. Although this is possible, there is a problem in that the circuit configuration of the system becomes complicated and its reliability decreases.

This invention was proposed with the above-mentioned considerations in mind.
Test data common to each device is output from each device within a certain period of time, and if the test data reception table provided inside each device is not updated within a certain period of time, an abnormality occurs in one of the systems. It was made to be judged as a thing.

Hereinafter, this invention will be explained with reference to the embodiments shown in FIGS. 2 and 3.

In FIG. 2, data bus B has n devices K,...
......Kn is connected.

For convenience of explanation, device K is the interface section 1.
It is assumed that the device Kn has a transmission control section 11 and a reception control section 12 in the device Kn, and the device Kn has only the reception control section 12 in the interface section 10. 20' is a data processing section.

FIG. 3 shows an example of test data common to the system, and FIG. This is common test data T, and D is its data part. In this data section D, for example, a device number is set. S is a selection information section indicating that this data section D is test data. Also, Figure 3b
is selected by the reception control section 12, the selection information section S
The test data T' before processing is shown with a processing information section Z indicating the processing contents in the device K provided in the data section D instead of . FIG. 4 shows an example of the format of the test data reception table (hereinafter referred to as table) TB provided in two data processing units, and is composed of a device number column and an update column indicating whether or not there is an update. for example,
The test data T outputted by the device K via its transmission control section 11 is transmitted to other devices K via the data bus B. It is arranged so that it can be done.

The reception control section 12 replaces the selection information section S of the test data T with the processing information section Z, and inputs the data section D. Then, immediately compare the data section D from the processing information section Z with the data section D of the test data T before sending, and if the two match, "YES" is displayed in the corresponding equipment number column of the table TB. Update this. Furthermore, if the results of the comparison do not match, "NO" is displayed, and in this case, the table TB is not updated. Note that a device having only the reception control section 12 (hereinafter referred to as device Kn)
Although the test data T cannot be transmitted by itself, the table TB provided in the reception control section 12 can be updated every time the test data T is received. In this way, every device K can update its own table TB every time it receives test data T.

If there is a device with a device number corresponding to the test data T that has not been input even after a certain period of time has elapsed, it can be determined that there is an abnormality in either that device or the data bus B. The main relationships between the causes of abnormalities and table updates are as follows, for example: ■ When data bus B is abnormal, tables TB of all devices K are not updated.

■ When the reception control unit 12 of a specific device is abnormal, only the table TB of that device is not updated.

(2) When the transmission control unit 11 of a specific device is abnormal, only the update column for that specific device in each device is not updated.

As described above, according to the present invention, "Test data is outputted from each device K at fixed time intervals, and the test data is sequentially outputted onto the data bus according to the data bus exclusive permission command, and test data that is not input within a fixed time is If there is data, the device number will be stored in the table, so if the contents of this table are configured to be displayed on an indicator lamp, for example,
It is possible to identify the equipment in which the abnormality has occurred and its location.

In addition, since the test data is common to each device, there is no need to create a special circuit, which simplifies the configuration.
There is no need for the system to malfunction. Further, according to the present invention, since the same test data can be sent to devices within the system at the same time, the diagnostic time can be significantly reduced compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a distributed bus control system, FIG. 2 is a system configuration diagram showing one embodiment of the present invention, FIG. 3 is a format showing an example of test data, and FIG. 4 is a block diagram showing the configuration of a distributed bus control system. is a format showing an example of a test data reception table. B... Data bus, K... System component equipment (equipment), 10... Data bus interface section, 11... Transmission control section, 12... ...
- Reception control unit, 20...Data processing unit, T...Test data TB...Test data reception table. O diagram * Z diagram Owo diagram Aku 4 diagram

Claims (1)

[Claims] 1 In a distributed bus control system in which multiple system component devices are connected to a shared data bus and necessary data is selected from the data on the data bus, common test data is collected from each system component device within a certain period of time. An automatic diagnosis method for a distributed bus control system in which system component devices that receive test data update their test data reception tables in their data processing units.