JP2685959B2 - Digital value chattering determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a digital value chattering determination device.

(Prior art) In the past, in the industrial world, information indicating the status of various manufacturing equipment on the manufacturing line was taken as a 0/1 digital signal into the status monitoring / equipment control computer of various manufacturing equipment, and this signal information was read. Based on this, it has been actively practiced to monitor the state of various manufacturing facilities and control the facilities.

This digital signal includes, for example, a product presence signal, but there is no chattering due to problems such as the structure of the sensor or proximity switch hardware for detecting changes in the presence status, or mechanical failure due to aging. Is extremely difficult to expect.

In order to address this issue, the mechanical structure of various manufacturing equipment should be made robust to suppress chattering, and equipment for detecting digital signals on various equipment side should be equipped with a chattering correction means for detection delay. Under the present circumstances, measures are taken such as notifying the host computer by means of the above, or allowing the host computer to recognize chattering by giving a unique logic for chattering for each channel.

(Problems to be Solved by the Invention) However, according to the above measures, if the mechanical structure of each equipment is made to be robust, the equipment cost is high. If the means for correcting chattering is adopted in the digital signal detection equipment of each equipment, it is new. It is inflexible because it is inevitable to respond to changes in the status of equipment and signal changes each time, and it takes development time if the host computer has unique logic for chattering for each channel, and the number of manufacturing equipment increases At the same time, problems such as an increase in computer load due to inherent logic have become apparent, and it has not been a perfect breakthrough for chattering.

The present invention has been made in view of the above problems, and only adopts a state monitoring / facility control computer located at a higher level of various manufacturing equipments without adopting measures against various chattering on the side of various manufacturing equipments. Can flexibly respond to situation changes such as new equipment introduction and signal changes, development costs are low, and the calculation load does not increase as the number of manufacturing facilities increases. It is an object of the present invention to provide a digital value chattering determination device capable of performing a digital value chattering determination operation and capable of inputting a correct digital value even for a digital signal in which chattering has occurred.

[Structure of the Invention] (Means for Solving the Problems) A digital value chattering determination device according to the present invention includes a group of digital signal detection / notification devices for each type of manufacturing equipment, and status monitoring / equipment control positioned above various manufacturing equipment. The computer, the digital signal capturing means in the condition monitoring / facility control computer, and the chattering of the captured digital signals are registered in advance by the dead time setting means. Whether the chattering is recognized or not based on the state determination and whether or not the chattering determination means determines the chattering is performed on the digital signal. Notify the status monitoring / equipment control means group corresponding to various manufacturing equipments with the digital value this time And a determination value notifying means for performing the determination.

(Operation) In the digital value chattering determination device of the present invention, digital signals of a plurality of channels are digital signals from a digital signal detection / notification device group of various manufacturing facilities in a state monitoring / facility control computer located above various manufacturing facilities. When the digital signal of each channel captured by the capturing means and the digital signal captured last time are compared and the value changes from 0 to 1, the dead time file for each channel registered in advance by the dead time setting means Whether or not chattering is present is determined by the chattering determination means based on the dead time and the state determination as to whether or not it is currently insensitive.

Then, when the chattering determination means determines that chattering has occurred in the current digital signal input to any channel, the determination value notifying means determines the previous digital value of the digital signal as the current digital value. Then, the corrected digital value is notified to the status monitoring / facility control means group as the current digital value.

By doing this, without adopting various measures against chattering on the side of various manufacturing equipment, it is possible to introduce new equipment or change signals by using only the status monitoring / equipment control computer located at the upper level of various manufacturing equipment. It can respond flexibly to changes in circumstances, keeps development costs low, and can recognize and judge general-purpose chattering without increasing the computer load as the number of control facilities increases. It is possible to perform condition monitoring and facility control that are unrelated to chattering that cannot occur at all in facilities. In addition, when it is determined that chattering has occurred in the digital signal of any of the input channels, the previous digital value is corrected and output as the current digital value, and the digital signal data may be lost. And the reliability of the operation can be improved.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which a manufacturing facility 2 is provided with one digital signal detection / notification device 1 capable of detecting digital signals of 8 channels, and a position above the manufacturing facility 2. It is equipped with a status monitoring / facility control computer 3.

In the condition monitoring / facility control computer 3, a digital signal capturing means 4 for capturing digital signals for 8 channels from the digital signal detection / notification device 1, a chattering determination means 5 for performing chattering determination, and a blindness for each channel. Dead time setting means 6 for setting the time, and dead time saving file 7 for each channel for registering the dead time for each channel set by the dead time setting means 6
And a judgment value notifying means 8 for notifying the chattering judgment result value of the chattering judgment means 5, and a state monitoring / control means group 9 for receiving the chattering judgment result value from the judgment value notifying means 8. .

The chattering determination means 5 preliminarily sets the dead time setting means 6 when the digital signal acquisition means 4 compares the digital signal acquired this time for each channel with the digital signal acquired last time and the value changes from 0 to 1.
Whether or not chattering has occurred is recognized and determined based on the dead time of the corresponding channel in the dead time storage file 7 registered by the above and the status judgment of whether or not the current time is in the dead state.

Then, the judgment result value of the digital value of each channel judged by the chattering judging means 5 is notified to the state monitoring / equipment control means group 9 by the judgment value notifying means 8.

As shown in FIG. 2, the dead time storage file 7 for each channel has a signal of 1 when the digital value changes from 0 to 1 corresponding to each of channels 1 to 8. Even if there is, the dead time is considered as 0 and the dead time is stored as table data. The dead time value corresponding to each channel can be freely set and changed by the dead time setting means 6.

Next, the operation of the digital value chattering determination device having the above configuration is determined.

The chattering determination means 5 executes the chattering determination according to the chattering determination flow shown in FIG. 3. For that purpose, first, the digital value which has been the current value up to then is set as the previous value (step S1).

Next, regarding the current value and the previous value newly captured by the digital value capturing means 4, if the previous value is 0 and the current value is 1, and the dead time has not been entered, the current value is the current dead time. Even if the value is 1, it is declared that the judgment value is 0 and the state is in the insensitive state (steps S2 and S3). Then, the dead time is calculated by adding the data input time and the dead time value of the corresponding channel read from the dead time saving file 7 for each channel, and the dead time is set (step
S4).

Further, when the value is 1 this time, first, if the current state is in the dead state, the dead time and the current dead time already set when the value change from 0 to 1 was detected in the past. If the signal acquisition time of this time is past the set dead time, the state of being insensitive is declared as a dead state, and then,
If the current state is insensitive, the current value is set to 0 (steps S5 to S10).

Such a chattering judgment flow is applied every time a digital signal is read, and after recognizing / judging whether or not the digital signal captured this time is chattering for each channel, the digital value of each judged channel is judged. The judgment result value is notified to the state monitoring / facility control means group 9 by the judgment value notifying means 8.

FIG. 4 is a result of judgment based on a chattering judgment flow of the chattering judgment means 5 with a digital signal before judgment of a certain channel taken in by the digital signal acquisition means 4 and a dead time as one signal acquisition interval. 7 is a timing chart showing changes in signal values before and after the determination. Therefore, a timing t at which a certain channel temporarily changes from 0 to 1 due to chattering
In the case of 1 and t2, the current value is set to 0, and the chattering is recognized and determined only at the timing t3 when 1 is continuously input.

In this way, in the case of this embodiment, without adopting various countermeasures against chattering on the side of various manufacturing equipments, new equipments can be provided only by the state monitoring / equipment control computer located at the upper level of various manufacturing equipments. It can flexibly respond to changes in the status of installation and signal changes, can reduce development costs, and can recognize and judge general-purpose chattering without increasing the computer load as the number of manufacturing facilities increases, and the hardware structure In terms of characteristics, it is possible to perform condition monitoring and facility control unrelated to chattering, which cannot be prevented from occurring in various manufacturing facilities.

[Effects of the Invention] As described above, according to the present invention, after inputting changes from 0 to 1, chattering recognition / judgment is performed when 1 is input continuously over a certain dead time. Therefore, it is possible to deal with chattering simply by setting the dead time on the computer side without taking measures against various chattering on the side of various manufacturing facilities as in the past. It is possible to respond flexibly to changes in the situation. In addition, since there is no chattering judgment logic for each equipment, the development cost is reduced, and the condition monitoring that is not related to chattering that occurs in various manufacturing equipment can be performed without increasing the computer load as the number of manufacturing equipment increases. It becomes possible to implement facility control. Also, when it is determined that chattering has occurred in the digital signal of one of the input channels, the previous digital value is corrected and used as the current digital value and output, so digital signal data loss may occur. And the reliability of the operation can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a dead time data table for each channel stored in a dead time storage file for each channel in the above embodiment, and FIG. 3 is a chattering judgment of the above embodiment. FIG. 4 is a flow chart showing the chattering determination operation of the means, and FIG. 4 is a timing chart for explaining the change in the digital value before and after the chattering determination in the above embodiment. 1 ... Digital signal detection / notification device 2 ... Manufacturing equipment group 3 ... Status monitoring / equipment control computer 4 ... Digital signal acquisition means 5 ... Chattering determination means 6 ... Dead time setting means 7 ... Dead time for each channel Saved file 8 …… Judgment value notification means 9 …… Status monitoring / equipment control means group

Claims (1)

(57) [Claims] 1. A group of digital signal detection / notification devices for each type of manufacturing facility, a status monitoring / facility control computer positioned above various manufacturing facilities, and a digital signal fetching means in the state monitoring / facility control computer. Chattering determination means for recognizing and determining chattering based on the dead time of the dead time saving file for each channel registered in advance by the dead time setting means and the status judgment of whether or not it is currently dead. For the digital signal for which chattering determination means has determined chattering, the previous digital value is corrected as the current digital value,
A digital value chattering judging device comprising judgment value notifying means for notifying a current status digital value of each channel to various manufacturing equipment and corresponding status monitoring / equipment control means groups.