JPH052593A - Restoring system for production monitoring system - Google Patents

Abstract

PURPOSE:To offer the restoring system of a production monitoring system capable of easily restarting a production monitoring computer at the time of occurance of abnormality distinguishably from system rise at starting. CONSTITUTION:Each facility control device C1 counts up the operating state of each facility B1 or the number of products, and when data are generated, a data reading request is outputted to a production monitoring computer A. After returning a response, the computer A writes data inputted from the device C1 to a data file DF1 corresponding to each facility B1 which is stored in an aux. storage device D to collect data. At the time of starting operation, the computer A writes file records in a production managing file F, and at the end of the operation, executes also the deleting processing of the written file records. At the time of starting, the computer A can discriminate abnormal rise due to a reset signal applied from the external when the computer A is abnormal according to the existence or non-existence of the file records.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production monitoring system restoration method for restarting a production monitoring system by resetting a computer when an abnormality occurs in the production monitoring computer in a production monitoring system.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 56-74726 discloses a conventional system for automatically recovering from a failure in an electronic device.
The signal is transmitted at a certain fixed interval, and when the signal generation time interval is longer than a predetermined time, a reset signal is sent to the circuit to reset the electronic device to the initial state.

Further, in this conventional example, when the monitoring target device 1 receives a status request signal from the abnormality monitoring device 2 as shown in FIG. 10A, the target device 1 is abnormal as shown in FIG. 10B. By repeating the transmission of the status signal to the monitoring device 2, the status monitoring is performed in the form of the abnormality monitoring device 1 as the main and the target device 2 as the slave. FIG. 11 shows a flow chart of the above operation. In step 1, the abnormality monitoring device 2 issues a status request signal to the target device 1, and in step 2, it is determined whether or not there is a status signal from the target device 1 to the abnormality monitoring device 2. If there is no status signal, abnormal processing is performed in step 3.

Now, as shown in FIG. 12, in the conventional example in which the power is turned on in step 1 (= system start), the system is operated in step 2, and the power is turned off in step 3, the target device 1 is abnormal. When the error occurs, the abnormality monitoring device 2 sends a reset signal to the target device 1 to restart the target device 1. However, as shown in FIG. 13, the power is turned on in step 1, and the start process (=
System start), step 3 starts the system, step 4 finishes the work (= system end), and step 5 turns off the power supply. In the production monitoring system, in addition to startup by turning the power on and off, ,
When the system operation is performed by the start and end work process,
Rebooting only with the same reset as in the above-described conventional example cannot cope with automatic recovery due to system abnormality detection.

[0005]

When the conventional technique is applied to the production monitoring system as described above, an abnormality occurs in the production monitoring computer, and the production monitoring system is restarted by resetting the production monitoring computer. ,
There is a problem that it is difficult to deal with randomly occurring computer abnormalities.

The present invention has been made in view of the above-mentioned problems, and its object is to easily restart the production monitoring computer when an abnormality occurs and to distinguish it from the system startup at the start of work. It is to provide a recovery system of a production monitoring system that can be performed.

[0007]

In order to achieve the above object, the invention of claim 1 controls equipment on a production line by means of an equipment control device, and monitors production data of the equipment and equipment operating conditions. In a production monitoring system in which information is transferred to and from the equipment control device by a production monitoring computer, an auxiliary storage device is provided in the production monitoring computer, which is generated only at the start of production and deleted only at the end of production. A file record is stored in the auxiliary storage device, and when an abnormality occurs in the production monitoring computer, the production monitoring computer is reset by a signal from the equipment control device, and the production monitoring computer causes the file record to be reset by the reset. Whether the startup is normal or abnormal is determined by whether or not there is an error, and the production monitoring system is restored. Is shall.

According to the second aspect of the present invention, when the equipment operating condition is monitored by passing information between the equipment control device and the production monitoring computer, data transmission / reception and start / end of each communication are responded to. It is characterized by setting a flag.

[0009]

According to the present invention, depending on the presence / absence of the file record stored in the auxiliary storage device, the computer power is turned on normally to start the system, or the external reset signal is sent when the computer is abnormal. Since it is possible to determine whether the system has started up abnormally, it is possible to automatically restore the system based on this determination even in the case of an abnormal condition.

[0010]

EXAMPLES The present invention will be described below with reference to examples. Figure 1 shows a production monitoring system using the present invention method, the equipment B ₁ ... is controlled by the equipment control device C ₁ ... which are responsible for each respective equipment B ₁ ... number of operating states and production results the corresponding count equipment control device C ₁ ... is, when data is generated, when the equipment control device C ₁ ... issues a data read request to the production supervisory computer a, production computer a has responded, the equipment control device C ₁ ... transmits data to the production monitoring computer A. Then, the data file D corresponding to the respective equipments B ₁ ... Provided in the auxiliary storage device D by the production monitoring computer A uses the transmitted data.
Write to F ₁ ... to collect data. The production monitoring computer A also writes a file record in the production control file F at the beginning of work and deletes the file record by writing at the end of work.

Here, the communication system between the equipment control device C ₁ ... And the production monitoring computer A is performed as follows.
That is, as shown in FIG. 2, the equipment control device C sends a read request to the production monitoring computer A by setting the communication flag value VA of the equipment control device A to "1" in step 1 and notifying the read request, The value VA of this communication flag
Becomes "1", the production monitoring computer A responds, the equipment control device C transmits data at the time of this response, and the transmitted data is provided in the auxiliary storage device D. Data file DF ₁ corresponding to facility B
Write in ... When this writing is completed, the equipment control device C is notified in step 4 by setting the value VB of the communication flag of the production monitoring computer A to "1".

Here, in the equipment control device C, after the read request (the communication flag value VA is "1"), the production monitoring computer A completes the read (the production monitoring computer A sets the communication flag value VB to "1"). ) Is counted in step 2, and if there is no notification of read completion within a fixed value t ₁ s, it is determined that the production monitoring computer A is abnormal (step 3).

If the production monitoring computer A is operating normally, the read completion is notified within the fixed value ts ₁ as described above. Now, after the notification of read completion, a fixed time t ₂ s
The production monitoring computer A monitors whether or not the value VA of the communication flag of the equipment control device C becomes "0" within that (step 5). If the value VA of the communication flag does not become "0", Production monitoring computer A is equipment control device C
Is determined to be abnormal (step 6).

If the equipment control device C is normal, the value VA of the communication flag is set to "0" within a fixed time t ₂ s. When the value VA of the communication flag becomes "0", the production monitoring computer A determines that the read request has been canceled (step 7), and sets the value VB of the communication flag to "0" (step
Ten). Production monitoring computer A is a predetermined time t ₃ values VA of communication flag within s are monitors whether a "0" (Step 8) If the value VA of the communication flag within a certain time ts ₃ is "0 If not, equipment control device C
Is abnormal (step 9).

When the equipment control device C is normal and the value VA of the communication flag becomes "0" within a fixed time ts ₃ , the production monitoring computer A determines the value VB of the communication flag.
The Although the "0", and whether to equipment control device C in the monitor value VB of communication flag of "0" is sent to the equipment control device C within the predetermined time ts ₄ (Step 1
1), if it is not sent within a certain time ts ₄ ,
It is determined that the production monitoring computer A is abnormal (step 12), and if the production monitoring computer A is normal, the process returns to step 1.

With such a communication system, the equipment control device C ₁ ... And the production monitoring computer A can detect the abnormality of the other party. Table 1 summarizes the communication flag values VA and VB in step 1, step 4, step 7, and step 10. In addition, FIG.
(B) is a timing chart showing changes in the flag values VA and VB during the communication process.

[0017]

[Table 1]

As described above, the production monitoring computer A,
When an abnormality of the production monitoring computer A is detected by the equipment control device C through communication with the equipment control device C, the equipment control device C automatically returns the production monitoring computer A. FIG. 4 shows a configuration of a circuit for turning on / off the power supply to the production monitoring computer A by the equipment control device C, and FIG. 5 shows a flowchart thereof.

First, when an abnormality of the production monitoring computer A is detected by the equipment control device C (step 2) through communication between the production monitoring computer A and the equipment control device C (step 1), the equipment control device C operates as a relay. The relay contact r of the relay RY inserted between the production monitoring computer A and the power source unit E through the cable L is turned off (step 3) to turn off the power supply to the production monitoring computer A. This off state is maintained for a certain time Ts (step 4), and then the relay contact r of the relay RY is turned on by the same procedure as the off operation (step 5).
The equipment control device C turns on the power supply to the production monitoring computer A.

As a result, the production monitoring computer A can be restarted in a hardware manner. 6 to 8 are detailed descriptions of the production control file in the auxiliary storage device D provided in the production monitoring computer A. The file is composed of unit records, and the presence or absence of data indicates the read pointer and write. It is determined from the state of the Ponta.

FIG. 7 shows the case where the production date before the start-up process is not written, and the values of the read pointer and the write pointer are the same at this time. FIG. 8 shows a case where the production date after the start-up process is written, and at this time, the value of the write pointer is advanced by 1 with respect to the value of the read pointer, and the record 1 is generated.

FIG. 9 shows a flow chart from the start-up to the end of the system. The production monitoring computer A
When the power is turned on (step 1), the state of the production control file F is first read (step 2). The file status is written in the header of the 0th record of the file. Depending on the determination result in step 3, the process branches as follows.

When the values of the read pointer and the write pointer are the same, it means that the system has normally started up and is in a normal start-up, and the start process is awaited (step 4). Is incremented by 1 with respect to the value of the read pointer (step 5). If the values of the read pointer and the write pointer are different, it exists only when the system has already started, so it is determined to be an abnormal startup.

After the above, the system starts (step 6). At the end of the system, end-of-life processing is performed, and the values of the write pointer and read pointer of the production control file F are made the same here (step 7). Then, the power supply to the production monitoring computer A is turned off (step 8).

Therefore, when the values of the read pointer and the write pointer are the same, it can occur only at the system start or at the end. Therefore, by referring to the production management file F, it is possible to determine whether the system is normally started or abnormally started.
As a result, even if an abnormality occurs in the production monitoring computer A, the operation of the production monitoring system can be restarted with a loss of only the time for automatic restoration.

[0026]

According to the invention of claim 1, the facility control device controls the facility of the production line, and the production data of the facility and
In a production monitoring system for monitoring equipment operating conditions and the like by passing information to and from the equipment control device by means of a production monitoring computer, an auxiliary storage device is provided in the production monitoring computer, and is generated only at the start of production. A file record to be deleted only at the end of production is stored in the auxiliary storage device, and when an abnormality occurs in the production monitoring computer, the production monitoring computer is reset by a signal from the equipment control device, and the reset causes the production monitoring computer to reset. Since the production monitoring computer determines whether the normal startup or abnormal startup is performed depending on the presence or absence of the file record and restores the production monitoring system, the system startup is performed depending on the presence or absence of the file record stored in the auxiliary storage device. Normal startup by turning on the computer power for It is possible to determine the abnormality or rise due to the reset signal from the outside to the computer abnormality, there is an effect that can be automatically restored to the system even in abnormal time on the basis of this determination.

According to a second aspect of the present invention, when the equipment operating condition is monitored by exchanging information between the equipment control device and the production monitoring computer, data transmission / reception as well as the start and end of each communication are responded to. Because you set the flag,
The facility control device and the production monitoring computer can monitor each other by exchanging data information.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a production monitoring system using an embodiment of the present invention.

FIG. 2 is a flowchart showing a communication method between an equipment control device and a production monitoring computer according to an embodiment of the present invention.

FIG. 3 is a time chart during communication between the equipment control device and the production monitoring computer according to the embodiment of the present invention.

FIG. 4 is a circuit configuration diagram for turning on / off the power supply unit of the production monitoring computer by the equipment control device according to the embodiment of the present invention.

5 is an operation flowchart of the circuit shown in FIG. 4;

FIG. 6 is a configuration diagram of a production management file in an auxiliary storage device of a production monitoring computer used in an embodiment of the present invention.

FIG. 7 is a configuration diagram of the auxiliary storage device of the production monitoring computer used in the embodiment of the present invention after the end-of-life process of the production management file.

FIG. 8 is a configuration diagram of a production management file of an auxiliary storage device of a production monitoring computer used in an embodiment of the present invention before a finishing process.

FIG. 9 is a flowchart of a system startup / shutdown configuration according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating an operation of detecting an abnormality in a conventional example.

FIG. 11 is a flowchart for explaining the operation of the conventional example.

FIG. 12 is a flowchart for explaining a process from system start to end in a conventional example.

FIG. 13 is a flow chart for explaining the process from the system start to the end of the production monitoring system.

[Explanation of symbols]

A production monitoring computer B ₁ equipment B ₂ equipment B ₃ equipment C ₁ equipment control device C ₂ equipment control device C ₃ equipment control device D auxiliary storage device DF ₁ data file DF ₂ data file F production control file

Claims (2)

[Claims] 1. A production monitoring computer, which controls equipment on a production line by means of an equipment control device, monitors production data of the equipment, equipment operating status, etc. by passing information to and from the equipment control device by means of a production monitoring computer. In the system,
An auxiliary storage device is provided in the production monitoring computer, a file record that is generated only at the start of production and deleted only at the end of production is stored in the auxiliary storage device, and when an abnormality occurs in the production monitoring computer, the equipment is installed. Resetting the production monitoring computer in response to a signal from a control device, and by the reset, the production monitoring computer determines normal startup or abnormal startup depending on the presence or absence of the file record, and restores the production monitoring system. Recovery method of production monitoring system characterized by. 2. When the equipment operating condition is monitored by exchanging information between the equipment control device and the production monitoring computer, data transmission / reception and flags corresponding to the start and end of each communication are set. The method for recovering a production monitoring system according to claim 1, characterized in that.