JPH0792773B2 - Failure detection method - Google Patents

Description

The present invention relates to a failure detection method for a device whose operation is controlled by a CPU.

(B) Conventional Technology Examples of devices whose operations are controlled by a CPU include vending machines and tabletop compact electronic computers. Japanese Unexamined Patent Publication No. 51-28454 discloses that in a small electronic computer, the presence or absence of print paper and the mounting condition of perforated tape are inspected by an error detection element arranged at an error check location according to an error processing program. Has been done. Further, Japanese Patent Publication No. 60-14395 discloses that an automatic vending machine is inspected for abnormality of each component of the automatic vending machine according to a failure search program. All of these conventional techniques detect an abnormality or a failure of a component or a component of a device.

(C) Problems to be solved by the invention However, especially when detecting a failure of a component of a device, it may not be enough to detect an abnormal point. I have something to know.

From the above point of view, the present invention provides a failure detection method capable of easily analyzing the progress of failure of a component of a device.

(D) Means for solving the problem A CPU is provided to control each component of the device according to a predetermined program, and at the same time to detect an abnormality of the component. Is assigned a predetermined code. Every time the CPU executes the process of this program, it sequentially writes the code corresponding to the process and the data related to the process to the storage means, and detects the abnormality of the component that is set in advance by detecting the abnormality of the component. The error code indicating is written in the storage means as data, and for the subsequent processing, the writing of the code and data is stopped, and the codes and data stored in the storage means are visually checked in the order of writing in response to the operation of the display switch. It is designed to be displayed on a possible device.

(E) Action Codes and data are sequentially stored as the program progresses, and when a failure occurs, the display switch is operated to sequentially display the codes and data stored so far.

(F) Embodiment An embodiment of the present invention will be described with reference to a vending machine controlled by a CPU. FIG. 1 is a block diagram showing an electric circuit configuration. (1) is a CPU, (2) is a RAM, and (3) is a control program for a vending machine including a failure detection system program according to the present invention. The stored ROM, (4), is an I / O interface, which are connected by an address bus (5) and a data bus (6). The I / O interface (4) is connected with a vending device (7), a selecting device (8), a display device (9), a coin processing device (11) and an input device (10). The vending machine (7) includes a drive motor for sending out a product for each product storage unit provided according to the type of product to be sold inside the vending machine. The selection device (8) includes a product selection switch corresponding to each of the product storage units, and the device (8) sends a signal indicating that a specific product selection switch is operated by the customer to the I / O interface ( Output to CPU (1) through 5). The display device (9) includes an amount display and a product sold-out indicator and is controlled by the CPU (1) through the I / O interface (4). The coin processing device (11) includes a coin switch, a change detector, and a coin payout drive motor,
The coin signal generated at the coin switch when a coin is inserted into the vending machine and the signal indicating the presence of change coins generated at the change detector are sent to the CPU through the I / O interface (4).
Output to (1), and the CPU (1) gives a signal for paying out necessary coins to the coin processing device (11) through the I / O interface (4). The input device (10) includes, for example, a keyboard for loading the selling price of a product for each product storage unit into the RAM (2).

The flowchart of FIG. 2 is based on the above vending machine,
The CPU (1) is a selling device (7) or a coin processing device (1
Only an example of the processing in the case of controlling the operation of the drive motor included in 1) according to the output of the cam switch corresponding to the motor is shown. As shown in FIG. 6, this cam switch is turned on and off in conjunction with the operation of the drive motor (16), and the cam switch (15) waits for contact with the recess (17A) of the cam (17). It is OFF in the state, and is ON in the operation state in which it comes into contact with the convex portion (17B) of the cam (17). CPU
(1) is the cam switch (15) in step S1 after the power is turned on.
Signal of the cam switch (15) OF in S2 step
When F is detected, the CPU (1) sets the timer constant in the internal timer register T in step S3. However, if the cam (17) is not stopped at the normal standby position and the cam switch (15) is ON, the CPU (1) sets a failure flag in the internal failure flag register F ₁ in step S10. CP
U (1) gives a drive signal to the drive motor (16) in step S4, inputs the signal of the cam switch (15) in step S5, and determines whether the cam switch (15) is ON in step S6. . At this time, if the drive motor (16) starts driving normally and the cam switch (15) is ON, the CPU (1)
Subtracts a timer value corresponding to a predetermined elapsed time from the timer register T in step S7, and determines in step S8 whether the stored value of the timer register T is "0". And CP
If the stored value of the timer register T is other than "0", U (1) repeats the processing from step S4, and if the OFF of the cam switch (15) is detected in step S6 during this time, it becomes the processing of step S11. Stop outputting the drive signal to the drive motor (16). However, if the cam switch (15) does not return to OFF even after a lapse of a predetermined time from the driving of the drive motor (16), the stored value of the timer register T becomes "0". Sets the failure flag in the failure flag register F ₁ .

In controlling the drive motor (16), the fact that the drive motor (16) has stopped due to a failure indicates that the failure flag register
It can be confirmed by the failure flag of the drive motor stored in F ₁ . However, in this case, it is not clear in which route the fault flag is set. Therefore, the present invention predicts a predetermined code for each process RO
Program in M (3), store the code corresponding to the process in RAM (2) each time the process is completed,
When an error occurs, this code is displayed so that the progress of processing can be easily confirmed. In addition to the code, the data related to the processing, such as the timer elapsed time which is the stored value of the timer register T, is also stored in the RAM.
Store in (2). Therefore, as shown in the flow chart of FIG. 3, the present invention adds a step of storing the code and data in the RAM (2) after the completion of each processing. That is, after the power is turned on, the code “A9” is stored in the S0A step, the data “A9” is stored in the S0B step, the code “A5” is stored in the S1A step after the processing of the S1 step, and the data is stored in the S1B step. Store “A5”. Since there is no particular data related to the processing at power-on and S1 step, the same "A9" and "A5" as the code are stored as data, but in this case,
The step of storing data may be omitted. The processing from step S4 to step S8 controls the drive of the drive motor (16). The code "D3" is stored in step S2A after step S2, and the step S9A immediately before step S11, which is the next processing, is stored. The store value of the timer register T is stored as data. And S after S11 process
In the 11A step, the code "D6" is stored, and in the S11B step, predetermined data is stored according to the presence / absence of the flag in the failure flag register F ₁ . That is, when the failure flag is set, the error code "EE" indicating the failure of the drive motor (16) programmed in the ROM (3) is stored as data and the failure flag is set. If not, the same "D6" as the code is stored as data. Such codes and data are set not only for the processing of the flowchart of FIG. 3 but also for all processing of the vending machine, and the code and data set beforehand as the processing progresses are stored in the RAM (2). Store at. The CPU (1) is a RAM (2) that stores codes and data.
When the storage area of is over, the code and data relating to the earliest processing is erased. When the CPU (1) detects a failure of a component of the vending machine such as a cam switch, the CPU (1) does not store the code and data corresponding to the processing even if the predetermined processing is executed thereafter. That is, CPU
When (1) writes the error code to RAM (2), the flag is set in the RAM holding flag register F ₂ at this time,
After that, the storage of code and data is stopped. Therefore
The history of processing until the failure is found is written in the RAM (2) as code and data.

The input device (10) is provided with a display switch (14), and a visual device (12) such as a printer or a display device is connected to the I / O interface (4) by a harness (13). By turning on the display switch (14), the CPU (1) sequentially displays the codes and data stored in the RAM (2). That is, as shown in FIG.
After the CPU (1) turns on the display switch (14) while the RAM retention flag is set, the codes and data stored in the RAM (2) are sequentially read and output to the visual inspection device (12). , Reset the RAM retention flag in register F ₂ .
Therefore, the visual device (12) displays the code and data as shown in FIG. 5, for example. When this display content is analyzed, the code and data corresponding to the newer processing are shown in the younger No. section. In this case, since the No. 1 data is "EE", the drive motor (16) It indicates that an abnormality is detected and the storage of code and data is stopped. And from No.4, the code "A"
You can confirm that the power is turned on by 9 ", then you can confirm that the signal of the cam switch (15) is input by the code" A5 ", and the cam switch (1 by the code" D3 ".
It is possible to confirm that 5) has been turned OFF, the data “OO” can be used to confirm that the timer time has expired while the cam switch (15) remains ON, and the code “D6” is the drive signal. It can be confirmed that the output of is stopped. Therefore, according to the display of FIG. 5, S8 step, S9
It is found that a failure is detected in the processing route of step S11.

(G) Effect of the Invention According to the present invention, in order to sequentially and visually display codes and data stored so far when a failure occurs,
It is possible to clearly understand the process leading to a failure and perform failure analysis in a short time. Further, it becomes possible to confirm the operation of the program when designing the program, and the debugging work time of the program is shortened.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit in the case of an automatic vending machine, FIG. 2 is a flow chart for controlling a drive motor, and FIG. 3 is a flow chart showing control of a drive motor when the present invention is carried out. FIG. 4 is a flowchart for explaining the operation of outputting the code and data to the visual inspection device in response to the operation of the display switch, FIG. 5 is a display example diagram of the visual observation device, and FIG. 6 is a configuration diagram of the cam switch. (1) …… CPU, (2) …… RAM, (3) …… ROM,
(4) …… I / O interface, (12) …… Visual device,
(14) …… Display switch.

Claims (1)

[Claims] 1. A device for controlling each component of a device having a CPU according to a predetermined program, and at the same time detecting a component abnormality, a predetermined code is predicted for each arbitrary process of the program. CPU assigned in advance
Every time the program executes the arbitrary process, the code corresponding to the process and the data related to the process are sequentially written to the storage means, and the abnormality of the component set in advance is detected by detecting the abnormality of the component. Is written in the storage means as data, the writing of the code and data is stopped for the subsequent processing, and the code and data stored in the storage means is written in response to the operation of the display switch. A failure detection method that displays in sequence on a visible device.