JPH04248647A - Bus diagnostic system - Google Patents

Abstract

PURPOSE:To automatically specify a trouble position to prevent the position from being left faulty and to easily cope with the trouble. CONSTITUTION:Factors of communication trouble received from peripheral devices 1a to 1c are analyzed by a trouble factor deciding part 4, and the trouble whose position cannot be specified is counted for each of peripheral devices 1a to 1c by a trouble counting part 5; and when the counted value exceeds a prescribed value in a certain time, a diagnosis control part 6 starts automatic diagnosis and controls peripheral devices 1a to 1c through a control bus 9 to specify the trouble position by transmission and reception of test data between normal peripheral devices whose counted values are small, transmission and reception of test data between peripheral devices regarded as normal and peripheral devices from which abnormality is reported, or switching of a communication data bus in the case of a duplex communication data bus 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a bus diagnostic method, and in particular to a bus diagnostic method for diagnosing and detecting a fault location when a fault occurs that is difficult to identify in a switching device that performs data communication between multiple peripheral devices. Regarding the method.

0002

[Prior Art] Conventionally, this type of bus diagnostic method does not have the function of automatically diagnosing and identifying the fault location, and it is not possible to analyze the cause of the fault or count faults that are difficult to identify. However, depending on the situation where a failure occurred, a person operated a maintenance console, etc. to start the diagnosis, and identified the failure location through trial and error.

0003

[Problems to be Solved by the Invention] In the conventional bus diagnosis method described above, diagnosis and fault processing are not automatically activated due to a fault, so the fault condition worsens, it takes time to deal with the fault, and the diagnostic procedure is delayed. It has the disadvantage of being complex.

0004

[Means for Solving the Problems] The bus diagnostic method of the present invention is such that each of the peripheral devices of a switching device that transmits and receives data between a plurality of peripheral devices via a communication data bus performs the data transmission and reception that transmits and receives the data and detects failures. and a peripheral device control unit that controls its own peripheral devices and transmits communication failures to a central control unit via a control bus, and when the central control unit receives the communication failure, it analyzes the cause of the failure. a failure factor determination unit that performs a failure determination unit; a failure counting unit that counts the number of failures for each peripheral device if the failure location cannot be identified; and a diagnostic control unit that performs a diagnosis when the number of failures exceeds a predetermined value within a certain period of time. It has a section.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the bus diagnosis method of the present invention.

In FIG. 1, each peripheral device 1a, 1b, 1
c includes data transmitting/receiving units 2a, 2b, 2c that transmit and receive data via the communication data bus 8 and detects failures, and controls each part of each peripheral device 1a, 1b, 1c and controls communication failures with the peripheral devices 1a, 1b, 1c. Control bus 9 between central control units 7
Peripheral device control units 3a, 3b, 3 that transmit information to the upper layer via
c, and the central control device 7 has peripheral devices 1a, 1b,
1c via the control bus 9, and a failure counting unit 5 that counts failures for which the failure location cannot be identified for each peripheral device 1a, 1b, and 1c. The apparatus includes a diagnostic control section 6 that performs diagnosis when a failure occurs a predetermined number of times or more in a period of time.

Note that FIG. 1 shows only the constituent elements necessary for realizing the functions, and although three peripheral devices 1a, 1b, and 1c are shown, any number may be used. However, automatic diagnosis is difficult when the number of peripheral devices is small.

Next, the operation of this embodiment will be explained.

First, data communication between the peripheral devices 1a, 1b, and 1c, for example, communication between the peripheral device 1a and the peripheral device 1b, is performed by data transmission and reception between the data transmission and reception section 2a of the peripheral device 1a, the communication data bus 8, and the peripheral device 1b. This is done in section 2b. During this communication, if the data transmitter/receiver 2a detects a failure whose location cannot be identified, the information is sent to the failure cause determination unit 4 in the central controller 7 via the peripheral device controller 3a and control bus 9. It will be done. The failure factor determination unit 4 analyzes the information, determines that the failure location is a failure that cannot be specified, and informs the failure count unit 5 of the failure. The failure counting section 5 increments a counter corresponding to the peripheral device 1a. Here, when the value exceeds a predetermined value, the information is transmitted to the diagnostic control section 6, and the diagnostic control section 6 automatically executes the diagnostic process.

Automatic diagnosis is performed as follows. First, the communication data bus 8 is diagnosed if the number of faults counted in the fault counter 5 is small and the communication data bus 8 is not considered to be faulty.
For example, assume that the peripheral device 1b and the peripheral device 1c are normal, and try sending and receiving test data between them. Furthermore, if the communication data bus 8 is duplexed as shown in FIG. 1, the communication data bus may be switched, or furthermore, a test may be performed using another set of peripheral devices that are considered to be normal. To diagnose the peripheral device 1a that has notified the failure, if it is determined that the communication data bus 8 is normal and, for example, the peripheral device 1b is normal, test data may be sent and received between them.

0012

[Effects of the Invention] As explained above, the present invention counts the failures for which the failure location cannot be identified, and automatically diagnoses the bus by regarding those with a small number of occurrences as normal, so that the failure location can be identified. This is done automatically, and has the effect of not leaving the problem unattended and making it easier to deal with the problem.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a bus diagnostic device of the present invention.

[Explanation of symbols]

1a, 1b, 1c Peripheral devices 2a, 2b, 2c Data transmitting/receiving units 3a, 3b,
3c Peripheral device control unit 4 Failure factor determination unit 5 Failure counting unit 6 Diagnosis control unit 7 Central control unit 8 Communication data bus 9 Control bus

Claims (1)

[Claims] 1. Each peripheral device of a switching device that transmits and receives data between a plurality of peripheral devices via a communication data bus includes a data transmitting and receiving unit that transmits and receives the data and detects failures, and a data transmitting and receiving section that performs control within the own peripheral device. a peripheral device control unit that transmits a communication failure to a central control unit via a control bus; a failure factor determination unit that analyzes the cause of the failure when the central control unit receives the communication failure; and a failure location that cannot be identified. A bus diagnostic method comprising: a failure counting unit that counts the number of failures for each of the peripheral devices in the case of a failure; and a diagnostic control unit that performs diagnosis when the number of failures exceeds a predetermined value within a certain period of time. .