JPS58165165A - Switching system of microcomputer system - Google Patents

Abstract

PURPOSE:To switch a microcomputer system quickly, by judging that the runaway of software, the electric power voltage drop, or the like occurs when the current integral value of a prescribed address bus is outside a prescribed range and switching the system in this case. CONSTITUTION:When detecting an abnormality in the current value of one of address busses, for example, an address bus A0 of a current microcomputer 1, an abnormality detecting circuit 4 transmits a switching interruption signal I to a stand-by microcomputer 1. As the result, the stand-by microcomputer 2 transmits a line switching signal S to a switch 5, and the connection between control lines 6 and 7 is switched to the connection between control lines 8 and 7. An integrating 41 of the abnormality detecting circuit 4 integrates (averages) the current of the address bus A0 with a prescribed time constant, and the output value is held constant approximately during a normal program processing. Consequently, it is discriminated whether the output value of the integrating circuit 41 is within a normal range or not; and when it is outside this range, the switching interruption signal I is outputted.

Description

[Detailed description of the invention] (1) Technical field of the invention The present invention combines one object with two microcombiners.

-ta, i.e. working and spare mitalo combination, -
The switching method of the microcombiner 1-ta system 5 is controlled using the controller.

(2) Technology view Real-time on-line control When controlling one object using a program, etc., one current microcomputer is used to control the current microphone "sr".
In the event that a failure occurs overnight, there is a standby I-Italo combination, a micro-clone ♂1 system which the ``Y'' will take over control of. In such a microcomputer system, it is important to quickly switch control from the active microcontroller C, , & - to the standby microcontroller in the event of a failure in the active microcontroller. It is.

(3) Prior art and problems According to the switching method of the conventional microcombination system, a hardware abnormality is detected using the output signal of the specific output 4-), and as a result, the interrupt program routine is Use it for control from the current microcontroller ♂1-Y for backup! I was trying to switch to control using the microcontrollers ♂ and -ta. However, with this conventional method, it is not possible to quickly detect software runaways or malfunctions (for example, power down), etc.
There was a problem in that switching to data was not quick.

(4) Object of the Invention The object of the present invention is to focus on a person in which the average value (integral value) of the current of the address bus is almost constant when a program is executed at a constant cycle, such as the real-time online control Zorodram, and If the current integral value of the current is out of the specified range, it is assumed that an air runaway or a power failure has occurred. It is possible to quickly and automatically switch from control by the current microcontroller to control by the standby microcontroller, and thereby to solve the problems in the conventional system described above.

(5) Structure of the Invention To achieve the above-mentioned object, according to the present invention, a microcombination unit comprising a working microcombination unit 1 and a standby microcombination unit for controlling one object;
- In the data system, the current microcombi, - an integrating means for integrating the current of a predetermined address bus, a discriminating means for discriminating whether the integral value of the nuclear integrating means is within a predetermined range, and a discriminating means for determining a skeleton. interrupt signal generation means for transmitting an interrupt signal to the standby i-microcombi, according to the result, and controlling the target from the working microcombi, -tar to the standby according to the interrupt signal; Provided is a switching method in a microcombi-ta system, characterized in that the microcombi-ta system is switched in the evening.

(6) Embodiments of the Invention The following drawings are used to explain the present invention: Figure 1 shows a microcomputer 111 as an embodiment of the present invention.
It is a Zoroku circuit diagram showing a switching method of the computer system. In FIG. 1, the working microcombiner 1 and the standby microcombiner 2 control the controlled object 3, and the abnormality detection circuit 4 is connected to the working microcombiner 1.
- When the abnormality of E1 is detected, the working microphone cooperation combination,
Control by IK is switched to control by backup microcontroller f&2.

In other words, the abnormality detection circuit 4 is located at the address/system of the current microcombi, for example, M. When an abnormality is detected from the current value, a switching interrupt signal I is sent to the standby microcontrollers #1 and #2.

As a result, the preliminary micro combination 1. - E2 sends the line switching signal name to the switch, and as a result, control line 6
and control line 7! The i connection becomes the connection switch to the connection between the control line 8 and the control line 7.

FIG. 2 is a detailed circuit diagram of the abnormality detection circuit 4 shown in FIG. 111. In FIG. 2, -41 is an integrating circuit composed of an Iode D and a canopy CK, 4.2.43 is a comparison circuit, 44 is an OR circuit, and 4.5 is a multivibrator.

The integration circuit 41 integrates (averages) the current of the address bus A with a predetermined time constant, and the time constant determined by the resistance value of the diode D4D and the capacitor CTC is shown in FIG. 3, for example. With real-time online control, the output value of the integrator circuit 41 is set to be longer than @m1 period of the RAM. Therefore, the output value of the integrating circuit 41 is kept at a nearly constant value during normal program processing as shown in FIG. become.

Comparison circuits 42 and 43 and OR circuit 44 are integral circuits 41
This is a means for determining whether the output value of is within the normal range. In this case 1. The normal range is expressed as V,...~V,2, where the O value v11''12 is the resistance R1, R2,
For example, when the output value of the integrating circuit 41 becomes less than the minimum set value 711, the output signal of the comparator circuit 42 becomes high or low, set by R3 and R4. So, OR circuit 44
The output signal of becomes high. Conversely, when the output value of the integrating circuit 41 exceeds the maximum set value V□, the output signal of the comparison circuit 43 becomes negative, and therefore the output signal of the OR circuit 44 becomes high. In this way, the output value of the integral path 41 is in the range vIt~v
When N2 is removed, the output signal of the OR circuit 44 changes from low to high.

The interrupt signal generator 45, which is an interrupt signal generating means, sends out a switching interrupt signal having a predetermined error width in response to a change in the output signal of the OR circuit 44 from low to high. Become.

The output value of such an integrating circuit 41 is in the range vIll~V□
The causes of disconnection include software (zologram) runaway and power failure.

As explained above, according to the present invention, detection of software runaway or power down, etc.
By determining whether it is hot (based on the integrated value of the current of the evening address signal), it is possible to quickly switch from the current microcombi, -evening control to the standby microcombi, -evening control. can.

[Brief explanation of the drawing]

Fig. 1 is a professional circuit diagram showing the switching method of a microconverter system as an embodiment of the present invention, Fig. 2 is a detailed circuit diagram of the abnormality detection circuit 4 of Fig. 1, and Fig. 3 is FIG. 3 is a diagram illustrating an example of a real-time online control program routine. l: Working microphone combination, -ta, 2; Backup microcontroller, 1-ta, 3: Controlled object%4: Abnormality detection circuit, 41:
Integrating circuit (integrating means), 41! , 43: Comparison circuit (discrimination means), 44: OR circuit (discrimination means), 45: One-shot multivibrator (interrupt signal generation means), A0
Near address path, l: switching interrupt signal. Patent Applicant: Fujitsu Limited Patent Application Certification, Competent Patent Attorney Iku Ki Roben m* M Tate Kazu 2 Bento 3! +, inside 1) Yukio 1 Patent attorney Akira Yamaguchi lol! Figure 11. @Figure 2' 3 1 Figure 3 □

Claims (1)

[Claims] 1. Current use for controlling one target! Ikrocon C &
-For sash and spares! A microcombiner equipped with a microcomputer 1 - In a voice system, the current microcombiner - an integrator that integrates a predetermined address and an integer current, and an integral value of the integrator are within a predetermined range. and interrupt signal generating means for transmitting an interrupt signal to the foreboard backup microphone I2 in accordance with the determination result of the scissors determining means, control to the target (by signal) to the current iItalo combination;
- A switching system in a microcombi-ta system, characterized in that switching is performed from the evening to the backup micro-combi-ta.