JPH06201799A - Pseudo-fault control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pseudo-fault occurrence control device that has a function for realizing pseudo-fault occurrence and a function for transmitting the pseudo-fault information, and that can be remotely controlled from a control unit provided outside the hardware system. provide. [Structure] A failure generation unit for forcibly changing a normal circuit signal in the electronic circuit package into a failure circuit signal is provided in an electronic circuit package 2 that constitutes the hardware system 1, and is provided outside the hardware system 1. The control unit 3 is connected via the serial interface 20 for transmitting fault instruction information, and the control unit 3 causes the fault occurrence site, the fault occurrence content,
The feature is that the failure occurrence time, failure duration, and failure occurrence interval can be specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention artificially causes a failure in a hardware system composed of an electronic circuit package, and performs a failure detection operation, a failure notification operation, and a control operation of the hardware system when a failure occurs. The present invention relates to a pseudo-fault occurrence control device used for the test and training of system operating personnel.

[0002]

2. Description of the Related Art Conventionally, there have been the following two methods as a method of artificially causing a failure and performing an operation test at the time of failure (NTT).
Technical Journal 1992.10).

The first method is a method of incorporating a means for instructing and transmitting a pseudo-fault occurrence and a means for generating a pseudo-fault in the system when designing a hardware system.

In the second method, after a hardware system is created, a switch for setting disconnection or short circuit of a circuit output is incorporated as a means for artificially generating a failure, and the switch is manually operated each time a test is performed to simulate the failure. A method of setting a fault.

[0005]

SUMMARY OF THE INVENTION The first method is a system in which a hardware system needs to be incorporated with parts and software for controlling occurrence of a pseudo-fault that is unnecessary after the end of the pseudo-fault test. It has the drawback of increasing the price and decreasing the system reliability.

Since the second method incorporates means for generating a pseudo-fault, it is necessary to remodel the electronic circuit package including new installation of switches, cutting / changing of existing circuit patterns, and wiring addition to the switches. The electronic circuit package densely mounted on the multilayer wiring board has a drawback that it is difficult to additionally change the wiring pattern on the circuit package and to secure a place for mounting a new circuit component such as a switch.

Further, in order to change the pseudo failure occurrence part, it is necessary to take out the electronic circuit package each time and manually switch the switch to change the failure part and the failure occurrence content. It has the drawback that it is difficult to specify detailed failure details such as automation of, and specification of failure occurrence duration.

An object of the present invention is to provide, in a hardware system composed of a plurality of electronic circuit packages, a function of realizing a pseudo failure occurrence and a function of transmitting the pseudo failure information, which is provided outside the hardware system. Another object of the present invention is to provide a pseudo failure generation control device which realizes a function of pseudo various failure states by remote control from a control unit.

[0009]

SUMMARY OF THE INVENTION A pseudo-fault occurrence control device according to the present invention forcibly changes a normal circuit signal in an electronic circuit package by a pseudo-fault activation provided in the electronic circuit package. A fault generating unit, a control unit installed outside the hardware system for instructing the fault generating unit of pseudo fault information, and a serial interface for transmitting fault instruction information connecting the fault generating unit and the control unit. Is to have.

[0010]

According to the present invention, the pseudo failure generating function is realized by forcibly connecting the output of the failure generating section to the circuit in the electronic circuit package without cutting or changing the circuit in the electronic circuit package. By combining the control units via the serial interface having the pseudo failure instruction information transmitting function, the function of generating various pseudo failures by remote control from the outside is realized.

[0011]

1 is a block diagram showing the configuration of an embodiment of the present invention. Reference numeral 1 denotes a hardware system, 2 denotes an electronic circuit package, and only one electronic circuit package 2 is shown in this embodiment. Reference numeral 10 is a failure generation unit, 11 is a pseudo failure generation circuit in the failure generation unit 10, 12 is a failure occurrence content selection circuit, 13 is a failure occurrence site selection circuit, 14 is a failure continuation time / occurrence interval designation circuit, Reference numeral 15 is a failure occurrence time designation circuit, and 16 is a failure information receiving circuit. Reference numeral 20 is a serial interface for transmitting failure instruction information.
Further, 30 is a control unit, 31 is a failure information transmission circuit in the control unit 30, 32 is a personal computer, Q is the failure occurrence content designated by the failure occurrence content selection circuit 12,
S is an activation signal Pn of the pseudo fault generating circuit 11, a normal circuit signal, and Pa is an abnormal circuit signal.

Next, an operation example of the embodiment in the case of the one electronic circuit package of the present invention shown in FIG. 1 will be described.

A personal computer 32 of the control unit 30
Then, the pseudo failure information indicating the failure occurrence site, the failure occurrence content, the failure continuation time, the failure occurrence interval, and the failure occurrence time is sent to the failure information transfer circuit 31. The failure information transfer circuit 31 transfers the instruction information to the failure information reception circuit 16 in the failure generation unit 10 through the serial interface 20 for transmitting failure instruction information.

In the failure generation unit 10, the failure information receiving circuit 16 receives the received information from the failure occurrence time designation circuit 15, the failure duration / occurrence interval designation circuit 14, the failure occurrence site selection circuit 13, and the failure occurrence contents selection. Transfer to circuit 12. The failure occurrence time designation circuit 15 activates a pseudo failure at the designated failure occurrence time.

The start-up signal S is the selection circuit 1 for the failure occurrence site.
3 is transmitted to the pseudo fault generating circuit 11 designated by 3. The pseudo-fault generating circuit 11 forcibly changes the normal circuit signal Pn, which is the circuit output in the electronic circuit package 2, to the signal state designated by the selection circuit 12 of the fault occurrence content Q to be the fault circuit signal Pa.

According to the failure duration time and the failure occurrence interval designated by the failure duration time / occurrence interval designating circuit 14, the pseudo failure occurrence circuit 11 forcibly changes the circuit output, and when the duration time ends, the circuit is forced. Stop output change.

With such a configuration, the failure generating unit 10 is provided in the electronic circuit package 2 of the hardware system 1.
Is connected via a serial interface 20 for transmitting fault instruction information, and a complex pseudo-fault occurrence in which a fault occurrence site, a fault occurrence content, a fault occurrence time, a fault continuation time, and a fault occurrence interval can be designated is remote from the control unit 30. It has the effect of being automatically controlled.

Means for forcibly changing the electronic circuit output,
That is, FIG. 2 shows an embodiment in the case of the digital circuit of the failure generating unit 10. In FIG. 2, 11A is a tri-state output circuit, 2A is a buffer to which a normal circuit signal is applied, and others are the same as in FIG.

The pseudo fault generating circuit 11 has a stronger voltage and current output capability than the circuit output element (buffer 2A) used in the electronic circuit package 2, and has output levels of H, L and high impedance. A possible tri-state output circuit 11A is used. The tri-state output circuit 11A is normally set to a high impedance state, and when the start signal S is input, the failure occurrence content selection circuit 12 is selected.
The failure content Q (fixed at H level or fixed at L level in the case of digital circuit) is output. When the state of the buffer 2A which is the circuit output element of the electronic circuit package 2 and the output of the tri-state output circuit 11A compete with each other, the output of the tri-state output circuit 11A is stronger, so that the output of the tri-state output circuit 11A is adjusted to the output of the tri-state output circuit 11A. This has the effect of forcibly changing the output of the electronic circuit package 2.

In order to prevent deterioration of the element when a pseudo failure occurs,
FIG. 3 shows an example of forcible occurrence of a pseudo fault provided with a current limiting function. In FIG. 3, G1 and G2 are NAND gates, Ry1 and Ry2 are relays, ry1 and ry2 are their contacts, R is a current limiting resistor, and Vcc is a power supply.

As the pseudo fault generating circuit 11, a relay Ry is used.
1 and Ry2 are used. Normally, these relays are kept in the OFF state, and the relay Ry1 or Ry2 that causes the pseudo-fault is turned on by inputting the activation signal S and designating the failure content designated by the output of the failure content selection circuit.
Set to N. A current limiting resistor R is provided in the relay circuit to limit the maximum forced drive current.

Pseudo-fault generating circuit 1 having such a function
By connecting 1 to the hardware system 1, the failure occurrence portion, the failure occurrence content, the failure occurrence time, the failure continuation time, without the modification involving disconnection / change of the circuit in the electronic circuit package 2 of the hardware system 1, It has the effect of generating complex pseudo-faults that can specify the fault occurrence interval.

Although the embodiment described above is a system in which a pseudo fault is generated in one electronic circuit package 2, a system in which the serial interface 20 for transmitting fault instruction information is in a bus form or a fault information transmitting circuit 31 is used. By adopting the method of connecting the serial interface 20 to each of the plurality of electronic circuit packages 2, a pseudo failure can be generated in the plurality of electronic circuit packages 2.

[0024]

As described in detail above, according to the present invention, the fault generating section forcibly changing the normal circuit signal in the electronic circuit package into the fault circuit signal by the pseudo-fault activation provided in the electronic circuit package. And a hardware system having a control unit installed outside the hardware system for instructing the failure generation unit to provide pseudo failure information, and a serial interface for transmitting failure instruction information that connects the failure generation unit and the control unit. Without cutting / changing the circuit pattern of the electronic circuit package inside, it is possible to incorporate the function to generate various pseudo faults in a pseudo manner, and it is possible to control various pseudo fault occurrences from a remote location, and further test for pseudo faults. There is an advantage that automation and efficiency can be realized.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram showing an embodiment of a failure generating unit in FIG.

FIG. 3 is a circuit diagram showing another embodiment of the failure generating unit in FIG.

[Explanation of symbols]

 10 Failure Generation Section 11 Pseudo-Failure Generation Circuit 12 Failure Generation Content Selection Circuit 13 Failure Part Selection Circuit 14 Failure Duration / Interval Designation Circuit 15 Failure Occurrence Time Designation Circuit 16 Failure Information Receiving Circuit 20 For Failure Instruction Information Transmission Serial interface 30 Control unit 31 Failure information transmission circuit 32 Personal computer Q Failure occurrence content S Failure occurrence circuit start signal Pn Normal circuit signal Pa Abnormal circuit signal

Claims (1)

[Claims] 1. A pseudo fault occurrence control device in a hardware system composed of a plurality of electronic circuit packages, wherein a normal circuit signal in the electronic circuit package is activated by a pseudo fault activation provided in the electronic circuit package. A failure generation unit that is forcibly changed into a failure circuit signal, a control unit that is installed outside the hardware system and that instructs the failure generation unit with pseudo failure information, and a failure that connects the failure generation unit and the control unit. A pseudo-fault occurrence control device having a serial interface for transmitting instruction information.