JPS6312042A - Runaway detection device - Google Patents

Abstract

PURPOSE:To facilitate a program preparation by giving an interrupting request to a computer at a constant interval with a counter, at a constant interval. CONSTITUTION:When an interrupting request is given, the data to clear a counter 2 are outputted and returned to a main program by an interrupting routine 3. The data are sent through a data bus 9 to a decoder 5, a signal to clear the counter 2 is generated from the decoder 5 and the counter 2 is cleared. When a computer 1 runs away and an interrupting request is executed, the data to clear the counter of an interrupting routine are not outputted, therefore, the counter 2 is timed over, the signal to initialize the computer 1 through a driver 6 is sent, initialized, the signal for the alarm is sent and the runaway is informed. Thus, since the address may not be generated at the program at a constant interval, the program preparation is facilitated.

Description

[Detailed Description of the Invention] [Summary] A computer is provided with a means for clearing a counter in an interrupt routine, the counter issues an interrupt request to the computer at regular intervals, and the counter is cleared in the interrupt routine. By detecting runaway of the computer when the counter is not cleared at regular intervals, it is possible to easily create a program for detecting runaway.

[Industrial application field]

The present invention relates to an improvement in a runaway detection device for detecting runaway of a computer.

It is desirable that a program for detecting computer runaway using a runaway detection device be easy to create.

[Conventional technology]

FIG. 4 is a block diagram of a conventional example.

In the figure, 1 is a calculator, 2 is a counter, 4 is a power-on-node circuit, 6 is a driver, 7 and 8 are OR circuits, and 10
indicates a decoder.

In the case of FIG. 4, the program of the computer 1' is designed to generate an address for clearing the counter at regular intervals, for example, every 250 meters.

First, when the power is turned on, the computer 1' and the counter 2 are initialized by the power-on reset circuit 4 and start operating.

When the operation starts, an address for clearing the counter every 250 m5 is sent to the decoder 10 by the above program, a signal for clearing the counter is sent from the decoder 10 to the counter 2 via the OR circuit 8, and the counter 2
Cleared every 50 ma.

However, when computer 1' goes out of control, the address that clears the counter every 250 seconds is no longer sent, and counter 2 times out, sending a signal to initialize computer 1 via driver 6, initializing it, and warning. send out a signal for

In this way, computer runaway is detected.

[Problem that the invention seeks to solve]

However, in the above case, when creating a computer program, an address for clearing the counter must be inserted every 250 m5 between programs, which causes a problem that creating the program is extremely time-consuming.

[Means for solving problems]

The above problem can be solved by providing the computer 1 with a means 3 for clearing the counter 2 in an interrupt routine, as shown in FIG.
The counter 2 issues an interrupt request to the computer 1 at regular intervals, and the interrupt routine clears the counter 2. If the counter 2 is not cleared at regular intervals, runaway of the computer 1 is detected. This problem is solved by the runaway detection device of the present invention.

[Effect]

According to the present invention, if the program is provided with means for clearing a counter as an interrupt routine, the counter 2 will be cleared by an interrupt request from the counter 2 at regular intervals. However, if the computer goes out of control, even if there are interrupt requests from counter 2 at regular intervals, the interrupt routine will not work properly, and counter 2 will not be cleared at regular intervals, resulting in a timeout of counter 2. Therefore, runaway of computer 1 can be detected.

Therefore, as a program, all you need to do is create an interrupt routine that has a means for clearing the counter, and the other programs can be left as they are, making it very easy to create a program.

〔Example〕

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a flowchart of the processing shown in FIG.

In the figure, 1 is a computer, 3 is an interrupt routine that clears a counter, 5 is a decoder, and 9 is a data bus.
The same reference numerals indicate the same functions throughout the figures.

In the case of FIG. 2, the computer 1 has a program that outputs data for clearing the counter as an interrupt routine, as shown in FIG. 3 (B), as means 3 for clearing the counter using an interrupt routine. .

First, when the power is turned on, the computer 1 and the counter 2 are initialized by the power-on reset circuit 4 and start operating, as in the conventional case. [Step 11 in FIGS. 3(A) and (C).
12) In the normal case, an interrupt request is issued from the counter 2 at regular intervals, for example, every 250 fertilizations. [Step 13 in Figure 3 (A)] When an interrupt request is issued, the interrupt routine 3 outputs data to clear the counter as shown in Figure 3 (B) [Step 15] and returns to the main program. (Step 16).

This data is sent to the decoder 5 via the data bus 9, and the decoder 5 issues a signal to clear the counter, thereby clearing the counter 2.

If the total xnl goes out of control, even if an interrupt request is issued, data to clear the counter of the interrupt routine is not output, so the counter 2 times out as shown in step 17 of FIG. 3(C), and as in the conventional case, At step 18, a signal is sent to initialize the computer 1 via the driver 6, and at the same time, a warning signal is sent to notify of runaway.

That is, by simply creating a program that outputs data for clearing a counter as an interrupt routine, the program does not need to generate an address at regular intervals (for example, 250 m5), making program creation very easy.

〔Effect of the invention〕

As explained in detail above, according to the present invention, all a program needs to do is to create a program that outputs data for clearing a counter as an interrupt routine, and the program generates an address at regular intervals (for example, 250m5). Since it is not necessary, it has the effect of making program creation very easy.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a flowchart of the process shown in FIG. 2, and FIG. 4 is a block diagram of a conventional example. In the figure, ■, 1゛ is a calculator, 2 is a counter, 3 is a means for clearing the counter with an interrupt routine, 4 is a power-on reset circuit, 5.10 is a decoder, 6 is a driver, 7.8 is an OR circuit, 9 indicates a data bus. The 7 principles of harvesting the teijiso ``rofu ω Kaya 1 Illusion 7072 map of the small percentage of roasted Liu 2 Kuni (C) 20-Chi v-1- 〒 32 I-#f”ko’s mouth/soflo 1U4 [! ]

Claims (1)

[Claims] A counter (2) is added to the computer (1) by an interrupt routine.
The counter (2) issues an interrupt request to the computer (1) at regular intervals, and the interrupt routine clears the counter (2).
A runaway detection device characterized in that a runaway of a computer (1) is detected when the counter (2) is not cleared at regular intervals.