JPS6151578A - Fault diagnostic system of electronic circuit device - Google Patents

Abstract

PURPOSE:To allow a host device to diagnose every slave device in detail by adding a bus dedicated to diagnosis and a control circuit for diagnosis. CONSTITUTION:The control circuit 101 of the host device 1 controls normal operation and has a diagnostic control program for controlling diagnostic control circuits 201 of slave devices 20. When a diagnosis is taken, the circuit 101 sends out a diagnostic command by the circuit 201 through a diagnostic dedicated bus 4, and the circuit 201 decides whether a diagnostic display is requested one or not from the address in sent data. The circuit 201 sends out diagnostic data to an input/output circuit 202 through a terminal 204 and data appearing at a terminal 205 is read and analyzed to diagnose the normalcy of the circuit 202. Similarly, the normalcy of logical circuits 2031 and 2032 is diagnosed and the circuit 201 diagnoses all elements in the device and then reports the diagnostic result to the circuit 101 of the device 1 together with its address, so that the result is displayed 208 when a fault occurs. The circuit 101 analyzes the reported data to control the presence/absence state of a fault as to each slave device.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for diagnosing faults in electronic circuit devices.

(Prior Art) FIG. 2 is a block diagram for explaining a fault diagnosis method for lightning and sub-circuit devices according to the prior art.

In FIG. 2, 1 is an upper electronic circuit device, 20° and 21 are lower electronic circuit devices, and 3 is a data bus. 1
Reference numeral 01 denotes a control circuit for controlling a lower-order device by program control, and includes a program for normal operation and a diagnostic program for checking a lower-order device that has caused a problem.

Reference numeral 102 is an input/output circuit for transmitting and receiving various data to and from lower-level devices. 202 is an input/output circuit having a configuration similar to that of the input/output device 102; 203 is a logic circuit for performing various operations according to instructions from the control circuit 101;

In FIG. 2, one of the lower electronic circuit devices 20
, 21, it is necessary to perform a complete diagnosis to determine the location of the failure. However, in the conventional diagnostic method, a diagnostic program inside a control circuit 101 provided in a higher-level device 1 provides diagnostic data to lower-level devices 20 and 21, and each lower-level device 20 and 21 uses the provided diagnostic data. Accordingly, the logic circuit 203 is operated and the operation result is sent to the host device 1 via the input/output circuit 202. By reading the returned data, the control circuit 101 provided in the higher-level device 1 was able to determine which lower-level device has experienced a failure.

(Problem to be Solved by the Invention) Therefore, the lower-level device performs the same operation as normal logical operation based on the diagnostic command sent from the control circuit of the higher-level device, and at the same time, the control circuit of the higher-level device performs the same operation as the normal logical operation. Since it is not possible to divide the entire diagnostic logic circuit and examine the operation of each part, it is not possible to examine all the operations of the logic circuit, and even if the diagnosis result is determined to be normal, multiple failures may actually be latent. The drawback is that it is often undetectable.

An object of the present invention is to provide a dedicated diagnostic bus between a higher-level electronic circuit and a lower-level electronic circuit device, separate from a bus used for normal operation, and further provide a diagnostic control circuit inside the lower-level device. The above-mentioned drawbacks are eliminated by providing a diagnostic control circuit with diagnostic instructions from the control circuit in the higher-level equipment via the diagnostic bus, and diagnosing the logic circuits in the lower-level equipment in detail. It is an object of the present invention to provide a nine-electronic circuit device failure diagnosis system configured to prevent failures from becoming latent and to perform highly accurate diagnosis.

(Means for Solving the Problems) The electronic circuit device failure diagnosis method according to the present invention includes a host device,
This is realized by configuring the system to include a plurality of lower-level devices and a bus.

The host device includes a control circuit and a pair of input/output circuits.

Each of the plurality of lower-level devices is equipped with a logic circuit, a pair of input/output circuits, and a diagnostic control circuit for diagnosing the normality of the operation of the internal electronic circuits based on commands that give diagnostic instructions from the device. .

A bus is provided between a higher-level device and multiple lower-level devices,
It consists of a data bus and a diagnostic bus that can perform all the interfaces between the above-mentioned devices through a pair of input/output circuits.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the electronic circuit device diagnostic method according to the present invention. In FIG. 1, l, 20.23.101.

102, 202, 212, and 3 are symbols indicating the same elements as in FIG. 2, respectively. On the other hand, 201 is a diagnostic control circuit for diagnosing a logic circuit within the device itself under program control, 2031 and 2032 are logic circuits, 208 is a fault indicator lamp, and 4 is a diagnostic bus.

The control circuit 101 of the higher-level device 11 is equipped with a program for controlling normal operation and a diagnostic management program for controlling the diagnostic control circuit of the lower-level device.

When executing a diagnosis, the control circuit 101 sends a diagnosis command to the diagnosis control circuit 201 of the lower-order device 20 via the diagnosis dedicated bus 4. The diagnostic control circuit 201 analyzes all of the sent data and determines whether the diagnostic instruction given to the address in the sent data is what it requested. The diagnostic control circuit 201, which is requested to perform diagnosis based on the determination result, divides the logic circuit in its own device into several parts under program control, and performs 71g? Then, diagnose the normality of the operation of each part. Is the diagnostic control circuit 201 connected to the terminal 204? The diagnostic data is sent to the input/output circuit 202 through the input/output circuit 202, and the data "f" appearing at the terminal 205 is read and analyzed to diagnose the normality of the input/output circuit 202. Similarly, the terminal 205 and the terminal 20
Between 6 and 6! The normality of the logic circuit 2031 placed between the terminals 205 and 207 is further diagnosed. Diagnostic control circuit 20
After diagnosing all parts in the device, 1.1 reports whether the diagnosis result is normal or faulty to the control 11 circuit 101 of the host device 1 by adding its own address. In the event of a failure, the failure indicator lamp 208f lights up. The control circuit 10.1 analyzes the reported data and manages the presence or absence of a failure for each lower-level device.

(Effects and Effects) As explained above, the present invention is configured by adding a dedicated diagnostic bus and a 1i111 circuit for diagnosis, so that a higher-level device can perform detailed diagnosis with each lower-level device. This has the advantage that fault isolation for each device can be easily identified.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the electronic circuit device failure diagnosis method according to the present invention. FIG. 2 is a block diagram showing an example of a configuration for implementing a conventional electronic circuit device failure diagnosis method. 1... Upper device i 101, 201... Control circuit 1.02, 202... Input/output circuit 70', 71-1st lower device? σ, 1. , 203X, 2032...Ethical circuit 208...Fault indicator lamps 204-207...Terminal

Claims (1)

[Claims] Diagnosing the normality of the operation of internal electronic circuits by a host device including a control circuit and a pair of input/output circuits, a logic circuit, a pair of input/output circuits, and a command giving a diagnosis instruction from the host device. A plurality of lower-order devices are provided between the higher-order device and the plurality of lower-order devices, and the pair of input/output circuits provide an interface between the upper and lower-order devices. What is claimed is: 1. A fault diagnosis method for an electronic circuit device, characterized in that the method is realized by comprising a data bus capable of performing a diagnostic operation and a bus consisting of a diagnostic bus.