JPH09181753A - Fault detector for data processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the fault detector for a data processor in which a faulty position is located easily, a fault detection time of a bus interface section of the data processor being a slave station is reduced and the effect of the fault on the entire transmission system is prevented. SOLUTION: A data processor 2 being a slave station is provided with a bus connecting contact 7 used to connect/disconnect a bus interface section 5 to/from a bus 3 and with a transmission processing section 4 discriminating whether or not the bus interface section 5 is normal by using the bus connection contact 7 to disconnect the bus interface section 5 from the bus 3 and sending/ receiving diagnostic data to/from the bus interface section 5. When the bus interface section 5 is discriminated to be faulty, the bus connecting contact 7 is disconnected from the bus 3 and a bus connection notice contact 8 is used to inform a data processing unit 1 being a master station of the fault.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device for a data processing device which is connected to a transmission line to transmit / receive data and process the data.

[0002]

2. Description of the Related Art Generally, in a transmission system, a data processing device as a master station and a plurality of data processing devices as slave stations are connected to a common transmission line. , Data is mutually transmitted and received. In this case, the data processing device, which is a slave station, includes a bus interface section having a transmission circuit and a reception circuit, and a data interface.
And a transmission processing unit that executes data transmission / reception, and the connection to the transmission line is performed via the bus interface unit.

In such a transmission system, conventionally, by transmitting and receiving diagnostic data between a data processing device which is a master station and a data processing device which is a slave station, these data are transmitted. It is performed to monitor whether the processing device or the transmission line is normal. That is, when the diagnostic data is transmitted from the data processing device, which is the master station, at regular intervals, the diagnostic data is transmitted via the transmission line to the data processing device, which is the slave station. The signal is received by the receiving circuit of the bus interface unit of and is sent to the transmission processing unit. The transmission processing unit transmits the received diagnostic data to the data processing device which is the master station via the transmission circuit and the transmission path of the bus interface unit. Then, in the data processing device which is the master station, when the response from the data processing device which is the slave station can be received within the predetermined time, it is determined to be normal, and if not, Is performed by an abnormality detection method of determining that an abnormality has occurred.

[0004]

However, in the above-described conventional abnormality detecting method, an abnormality occurs in either the data processing device which is the master station, the transmission processing device which is the slave station, or the transmission path. Since it cannot be determined whether or not the abnormality has occurred, there is a drawback in that the abnormal portion cannot be promptly identified and it takes a long time to restore the normal state. In particular, when an abnormality occurs in the bus interface section of the data processing device which is a slave station, the abnormality propagates to the entire transmission line depending on the abnormality mode, and other normal data is transmitted. In some cases, the processing device may not be able to transmit data, and the interface of the data processing device, which is the slave station.
In the case of an abnormality in the face portion, it is required to restore the normal state in a short time. Further, since the abnormality detection of the data processing device which is the slave station is performed by the data processing device which is the master station, in the case of a transmission system in which a large number of data processing devices which are slave stations are connected, the master station There is also a drawback that it takes a long time before a certain data processing device determines that there is an abnormality.

Therefore, the present invention facilitates the identification of an abnormal portion, shortens the abnormality detection time of the bus interface portion of the data processing device, which is a slave station, and spreads the abnormality to the entire transmission system. It is an object of the present invention to provide an abnormality detection device for a data processing device that can prevent the above.

[0006]

According to the present invention, there is provided a bus interface having a data processing device which is a master station connected to a transmission line, a reception circuit and a transmission circuit, and which is connected to the transmission line. And a data processing device which is a slave station provided with a section, and monitors whether or not the data is normal by transmitting and receiving diagnostic data between these data processing devices. In the abnormality detection device of the data processing device, the data processing device, which is the slave station, is provided with a bus connection contact for connecting or disconnecting the transmission line and the bus interface portion, and the bus connection contact Whether or not the bus interface unit is normal by disconnecting the bus interface unit from the transmission path and transmitting and receiving diagnostic data to and from the bus interface unit. And determining the transmission processing unit, the Basuinta - when it is determined that the face portion is abnormal, the abnormality de is the master station - providing a bus connection notification contacts to notify the data processing device.

In the above-mentioned abnormality detecting apparatus of the present invention, an abnormality in the bus interface section of the data processing apparatus, which is a slave station, can be promptly detected by the transmission processing section, and furthermore, the bus connection contact disconnects from the transmission path. So,
It is possible to prevent an abnormality from spreading to the entire transmission system. It is also possible to promptly notify the transmission processing device, which is the master station, of an abnormality in the transmission processing device, which is the slave station.

[0008]

1 is a block diagram showing an embodiment of the present invention. In the figure, a data processing device 1 which is a master station is connected to a bus 3 which is a transmission line. The data processing device 2 which is a slave station is provided with a bus interface section 5 having a transmission circuit 5a and a reception circuit 5b and connected to the bus 3. The bus interface unit 5 is connected to a transmission processing unit 4 for executing data transmission / reception and determining whether or not the bus interface unit 5 is normal. The relay 6 has a bus connection contact 7 and a bus connection notification contact 8 and is controlled by the transmission processing unit 4. That is, the bus connection contact 7 is provided between the transmission line 3 and the bus interface unit 5, and is relayed from the transmission processing unit 4.
It is closed or opened by the relay drive output to 6.
The bus interface unit 5 is connected to or disconnected from the transmission line 3. The bus connection notification contact 8 is formed so as to be in the same open / close state as the bus connection contact 7, and is connected to the data processing device 1 which is a master station. When the open circuit state is continued as described above, the data processing device 1 as the master station detects that the bus interface unit 5 is abnormal.

Next, the operation of the above embodiment will be described. Normally, the drive output from the transmission processing unit 4 to the relay 6 causes
Since the bus connection contact 7 and the bus connection notification contact 8 are both closed, the bus interface unit 5 is connected to the bus 3, and the data processing device 1 as the master station has the bus interface unit. 5 is detected to be normal.

The monitoring of whether or not the bus interface section 5 of the data processing unit 2 which is a slave station is normal is carried out as follows. First, the transmission processing unit 4 outputs the relay drive to the relay 6, and both the bus connection contact 7 and the bus connection notification contact 8 are opened. With the opening of the bus connection contact 7, the bus interface unit 5 moves to the bus 3
Disconnected from Next, the transmission processing unit 4 uses the bus interface.
The transmitting circuit 5a of the face unit 5 transmits the diagnostic data. This diagnostic data is received back by the receiving circuit 5b at the same time.

The transmission processing unit 4 collates the transmitted diagnostic data with the received diagnostic data. This is repeated several times, and when the result of collation does not match each time, the transmission processing unit 4 determines that an abnormality has occurred in the bus interface unit 5, and leaves the bus connection contact 7 in the open state. hand,
The state where the bus interface unit 5 is separated from the bus 3 is continued. As a result, the abnormal bus interface
The abnormality does not spread from the face portion 5 to the bus 3.
Further, since the bus connection notification contact 8 also remains in the open state, when the open state continues for a certain period of time or longer, the data processing device 1 as the master station detects that the bus interface section 5 is abnormal. To detect.

On the other hand, in the transmission processing unit 4, when the result of collation between the transmitted diagnostic data and the received diagnostic data matches, the transmission processing unit 4 determines that the bus interface unit 5 is normal. When the relay 6 is driven, the relay 6 is driven to close both the bus connection contact 7 and the bus connection notification contact 8. As a result, the bus interface unit 5
Is connected to the bus 3 and returns to the normal state. Further, since the open state of the bus connection notifying contact 8 does not continue for a certain time or longer, the data processing device 1 which is the master station detects that the bus interface section 5 is normal.

Incidentally, the data processing device 2 which is the slave station in which the bus interface section 5 is judged to be abnormal is reset internally and restarted, and the same monitoring as above is carried out. Then, by repeating this, when the transmission processing unit 4 determines that the bus interface unit 5 is normal, the normal state is returned in the same manner as above.

In addition, the data which is the master station in the normal time is
The monitoring by the data processing device 1 is performed in exactly the same manner as the conventional one. That is, when the diagnostic data is transmitted from the data processor 1 which is the master station at regular intervals, the diagnostic data is transmitted through the transmission line 3 to the data which is the slave station. The signal is received by the receiving circuit 5b of the bus interface unit 5 of the processing device 2 and sent to the transmission processing unit 4. The transmission processing unit 4 uses the received diagnostic data as a bus interface unit 5
To the data processing device 1 which is the master station via the transmission circuit 5a and the transmission line 3. When the data processing device 1 which is the master station can receive the response from the data processing device 2 which is the slave station within a predetermined time,
It is determined to be normal, and if not, it is determined to be abnormal.

If it is determined that an abnormality has occurred,
As described above, the data processing device 2, which is a slave station, is independently monitored as to whether it is normal and is maintained in a normal state. Therefore, in most cases, the data processing device 2 is a master station. It is an abnormality of the data processing device 1 or the bus 3, and the abnormal portion can be easily detected, and the normal state can be quickly restored. In the above embodiment, the case where there is one data processing device 2 which is a slave station connected to the bus 3 has been described. However, the same applies when a plurality of data processing devices 2 are connected. Omit it.

[0016]

As described above, according to the present invention, it is possible to accurately and quickly detect an abnormality in the bus interface portion of a data transmission device that is a slave station, and at the same time, perform transmission due to this abnormality. Preventing the spread to the whole system, it becomes possible to make the system highly reliable.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 data processing device (master station) 2 data processing device (slave station) 3 bus 4 transmission processing part 5 bus interface part 5a transmitting circuit 5b receiving circuit 6 relay 7 bus connection contact 8 bus connection Contact for notification

Claims (1)

[Claims] 1. A slave having a data processing device, which is a master station connected to a transmission line, a reception circuit and a transmission circuit, and provided with a bus interface section connected to the transmission line. An abnormality detecting device for a data processing device, which comprises a data processing device which is a station, and monitors whether or not the data processing device is normal by transmitting and receiving diagnostic data between the data processing devices. In the data processing device which is the slave station, a bus connection contact for connecting or disconnecting the transmission line and the bus interface part, and the bus interface part for connecting the bus interface part to the transmission line. And a transmission processing unit that determines whether or not the bus interface unit is normal by transmitting and receiving diagnostic data to and from the bus interface unit. When it is determined that the bus interface portion is abnormal, a bus connection notification contact for notifying the abnormality to the data processing device which is the master station is provided. Device abnormality detection device.