JPH0619738A - Simulated fautl device for electronic equipment connected with bus network - Google Patents

Abstract

PURPOSE:To generate a simulated fault without any problem even if an electronic equipment is connected to the other one connected with a bus network by means of a signal line except for the bus network. CONSTITUTION:At the time of simulating the fault by providing a second data bus 23 in addition to a first data bus 19 connecting the electronic equipment A and a bus controller 2, relay boxes 24 and 25 switch the electronic unit A from the first data bus 19 to the second data bus 23 so as to connect them. A simulation device 26 executes a fault response to the bus controller 2 in place of the electronic equipment A. The simulation device 26 gives data to the electronic equipment A by using the second data bus 23 in place of the bus controller 2 as necessary so as to prevent thoccurrence of abnormality in a low-rank connected equipment C connected with a signal line 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for simulating a failure of an electronic device connected by a bus network, and is useful when applied to, for example, a simulated failure generating unit in a maintenance staff training device or a software verification facility using the network. It is something.

[0002]

2. Description of the Related Art A conventional simulated failure device will be described with reference to a system diagram shown in FIG. In the system of FIG. 3, a bus controller (B
C) 2 is connected to each of the remote terminals (RT) 3 and 4 of the electronic devices A and B, and the bus controller 2 communicates with the electronic devices A and B via the data bus 1. According to the above, each diagnosis is performed. The simulated failure device 5 includes a simulation device 6 and a relay box 7,
8, each relay box 7, 8 is connected to each electronic device A,
The remote terminal (RT) 9 of the simulation apparatus 6 is connected to the data bus 1 by connecting the remote terminals 3 and 4 of B and the data bus 1 in the middle thereof. The simulation device 6 sets a simulated failure of the electronic devices A and B, communicates with the bus controller 2 via the data bus 1, and also has a discrete output (DO) 1
The relay boxes 7 and 8 are controlled by 0. Reference numeral 11 is a signal line other than the data bus 3 and connects between the electronic devices A and B.

In FIG. 3, when simulating the failure of the electronic device A, the simulation device 6 cuts the lead-in line from the data bus 1 to the electronic device A by the relay box 7, and instead of the electronic device A, the simulation device 6 Responds to the command from the bus controller 2 with a failure.

[0004]

However, in the system shown in FIG. 3, the electronic device A has the signal line 11 in addition to the data bus 1.
And is connected to another electronic device B. Therefore, when the original electronic device A is designed to send data to the electronic device B via the signal line 11 according to the command from the bus controller 2, the simulated failure device 5 simulates a failure of the electronic device A. Since the electronic device A itself is disconnected from the bus controller 2 and cannot receive the command, it becomes impossible to output data to the electronic device B via the signal line 11.
As a result, the electronic device B cannot have the data such as the normal data and the failure data required for the electronic device A, and the system as a whole has a problem (or normal) between the electronic devices A and B viewed from the electronic device B side. I will detect it. The same goes for
The same can be said when the failure simulation of the electronic device B is performed. Therefore,
In the conventional simulated failure device 5, the range of failure simulation is narrowed.

It is an object of the present invention to provide a simulated failure device that overcomes the above-mentioned drawbacks of the prior art.

[0006]

A simulated failure device for an electronic device coupled by a bus network according to the present invention is connected to a first data bus, a bus controller connected to the first data bus, and a first data bus. A first electronic device and a second electronic device connected to the first electronic device by a signal line other than the first data bus, a second data bus different from the first data bus; The simulation device includes a connection selection device that selectively connects one electronic device to the first data bus and the second data bus, and a simulation device that is connected to the first data bus and the second data bus and sets a simulated failure. Means for giving a selection command to the connection selection device, means for outputting a failure response to the command from the bus controller to the first data bus, and data necessary for the first electronic device. It is characterized in that there are means for outputting the data to the second data bus.

[0007]

When simulating a failure, the connection selection device switches the first electronic device from the first data bus to the second data bus and connects, and instead of the first electronic device, the simulation device sends a command from the bus controller. Respond to the failure. Also, the simulation apparatus transmits data to the first electronic device instead of the bus controller via the second data bus, and the data causes the first electronic device to transmit via the signal line other than the data bus to the second electronic device. Send the necessary data to.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an apparatus according to an embodiment of the present invention.
In FIG. 1, electronic devices A and B, a data bus (hereinafter referred to as a first data bus) 1 and a bus controller 2 are the same as those shown in FIG. 3, and the bus controller 2 passes through the first data bus 1. And communicate with electronic devices A and B,
Make each diagnosis. The electronic devices A and B are connected to each other by the signal line 11 other than the first data bus 1, but since they are both connected to the first data bus 1, one of them is the first electronic device, The other becomes the second electronic device.

A portion surrounded by a broken line in FIG. 1 is a simulated failure device 22A, which includes a second data bus 12, relay boxes (connection selection devices) 13 and 14, and a simulation device 15. The second data bus 12 is different from the first data bus 1, and the service lines of both the data buses 1 and 12 are selectively connected to the remote terminal 3 of the electronic device A by the relay box 13 and also by the relay box 14. It is selectively connected to the remote terminal 4 of the electronic device B. The simulation device 15 sets a simulated failure of the electronic devices A and B, and the bus controller (B
It has a C) 16, a discrete output (DO) 17 and a remote terminal (RT) 18. The discrete output 17 of the simulation device 15 gives a selection command to the relay boxes 13 and 14 to control the connection between the electronic devices A and B and the first and second data buses 1 and 12. Also,
The remote terminal 18 is connected to the first data bus 1 and responds to a command given from the bus controller 2 via the first data bus 1 to the electronic device A or B.
Instead, the fault response is output to the first data bus 1. That is, a signal simulating a failure is output. Furthermore, the bus controller 16 of the simulation device 15 simulates a part of the original bus controller 2 and outputs failure simulation data required for the electronic device A or B to the second data bus 12, and the electronic device A or B. Can output necessary data to the electronic device B or A of the other party via the signal line 11.

When simulating the failure of the electronic device B in FIG.
The electronic device A is switched to the first data bus 1 as it is, and the other electronic device B is switched from the first data bus 1 to the second data bus 12 and connected. In this state, the simulation device 15 responds to the command from the bus controller 2 by the failure response from the remote terminal 18 in place of the electronic device B, and the bus controller 16 uses the second data bus 12 to perform the electronic response. A command is sent to the electronic device B as necessary so that no abnormality occurs in the device A. When simulating the failure of the electronic device A, the relay box 13 is activated and
In the above description, A may be replaced with B and B may be replaced with A.

Next, the apparatus of the embodiment shown in FIG. 2 will be described.
This embodiment is in a multiple data bus system, in which a bus controller 2 is connected via a coupler 20 to a first data bus 19 in which two buses A and B are multiplexed, and a first data bus 19 via a coupler 21. 1 Electronic device A is connected. The first electronic device A has a signal line 1 other than a data bus.
At 1, the second electronic device C, which is a subordinate connection device, is connected. The bus controller 2 uses the first data bus 19 to
Control a plurality of remote terminals (RT) including the first electronic device A having the subordinate connection device C.

The simulated failure device 22B has a second data bus 23.
And relay boxes (connection selection devices) 24 and 25, and a simulation device 26. Second data bus 2
3 also has two buses A and B multiplexed, and the remote terminal 3 of the first electronic device A is connected via the coupler 31.
It is connected to the. One relay box 24 is connected to one bus 19A of the first data bus 19 and the second data bus 2
One of the buses 23A is switched to the remote terminal 3 of the first electronic device A, and the other relay box 2 is connected.
Reference numeral 5 switches the other bus 19B of the first data bus 19 and the other bus 23B of the second data bus 23 to connect to the remote terminal 3 of the first electronic device A. The simulation device 26 sets a simulated failure of the first electronic device A, and includes a bus controller (BC) 27, a discrete output (DO) 28, and a remote terminal (R).
T) I have 29. The discrete output 28 of the simulation device 26 gives a selection command to the relay boxes 24 and 25 to control the connection between the first electronic device A and the first and second data buses 19 and 23. Further, the remote terminal 29 is connected to the first data bus 19 via the coupler 30, and responds to a command given from the bus controller 2 via the first data bus 19 to the first electronic device A.
Instead, the fault response is output to the first data bus 19.
That is, a signal simulating a failure is output. Further, the bus controller 27 of the simulation device 26 simulates a part of the original bus controller 2 and outputs failure simulation data necessary for the first electronic device A to the second data bus 23,
The first electronic device A can output necessary data to the lower second electronic device C via the signal line 11.

In simulating the failure of the first electronic device A in FIG. 2, the simulation device 26 gives a selection command to the relay boxes 24, 25 to activate them, and the first electronic device A is transferred from the first data bus 19 to the second data bus 19. Switch to the data bus 23 for connection. In this state, the simulation device 26
Responds to a command from the bus controller 2 from the remote terminal 29 in place of the first electronic device A, and uses the second data bus 23 from the bus controller 27 to send the second electronic device C. A command is sent to the first electronic device A as necessary so that no abnormality occurs in the.

[0014]

According to the simulated failure device of the present invention, the second data bus is added to provide the necessary data to the first electronic device simulating the failure, so that the electronic devices coupled by the bus network are connected. In the system, even when the electronic devices connected to the first data bus are connected by signal lines other than the system bus network, or the electronic devices connected to the first data bus are connected by signal lines other than the system bus network. Even if there is a connected subordinate device, a meaningful simulation failure can be generated without narrowing the scope of failure simulation.

[Brief description of drawings]

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

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 A, B, C Electronic equipment 1, 19 First data bus 2 Bus controller 3, 4, 18, 29 Remote terminal 11 Signal line other than data bus 12, 23 Second data bus 13, 14, 24, 25 Relay box 15 , 26 Simulation device 16, 27 Bus controller 17, 28 Discrete output

Claims (1)

[Claims] 1. A first data bus, a bus controller connected to the first data bus, a first electronic device connected to the first data bus, and a signal line other than the first data bus for the first electronic device. A second data bus different from the first data bus, and a connection selectively connecting the first electronic device to the first data bus and the second data bus The simulation device includes a selection device and a simulation device that is connected to the first data bus and the second data bus and sets a simulated fault.
A means for giving a selection command to the connection selection device; a means for outputting a failure response to a command from the bus controller to the first data bus; and a second data necessary for the first electronic device.
A simulated failure device for electronic equipment connected by a bus network, characterized in that it has means for outputting to a data bus.