JPH0756993A - Production managing device - Google Patents

Abstract

PURPOSE:To quickly retrieve desired event data with small memory capacity by recording the orders of events before and behind generated in the same work separately from the that of the events before and behind generated in plural works. CONSTITUTION:A line controller 2 issues a production instruction to each work on a production line according to a production information record from a work station 1. When the event of production abnormality is generated in a programmable logic controller(PLC) 3 and a robot 4, a link number is provided in the production information record that is data of fixed length in the inside of the line controller 2, and furthermore, event data is written on an event buffer where variable length data is stored corresponding to the link number. The event buffer allocates a link pointer to record the orders of the events before and behind generated in the same work in the plural works and a link pointer to record that of the events before and behind generated in the plural works, and stores and retrieves the event data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production management device for managing an event that occurs in a work.

[0002]

2. Description of the Related Art In recent years, a factory has a work station (hereinafter, referred to as WS) which is a higher-level control processing unit for integrally controlling a plurality of production lines, and the plurality of productions according to a production information record from the WS. A line controller, which is a middle-level control processing device that controls at least one production line from the line, and a programmable logic controller (hereinafter, referred to as PLC), which is a lower-level control device that controls at least one work according to the work content from the line controller. Described)) and the like. However, in the process of controlling the work by the PLC, defective production such as assembly failure or abnormal deformation of the vehicle body may occur as an event, and event data generated at this event is collected from the PLC or the like, and the whole work is finished. Each time, it is written in the WS from the line controller as all event data generated in all works.

Further, the line controller stores event data collected from a PLC or the like by either of the following two methods.

First, the first method is W as shown in FIG.
It was to attach a fixed-length memory area as an event information area similarly to the production information record which is the fixed-length data from S, and store the event data in this event information area.

In the second method, as shown in FIG. 4B, an event buffer is provided separately from the fixed length production information record, and an ID as an identification number corresponding to the event buffer is added to the production information record. To be attached to this I
The event buffer is searched according to D and the event data is stored in the corresponding event buffer.

[0006]

Therefore, since the event information area for storing the event data has a fixed length, it is necessary to secure a constant memory capacity regardless of the data length of the event data, so that a large capacity memory is required. If you want to search for the desired event data from the event data that has occurred in all the workpieces that are controlled by the line controller, you must search all the event data that has occurred, so you can search in a short time. I couldn't.

[0007] Therefore, an object of the present invention is to provide a production management apparatus capable of promptly searching for desired event data by efficiently allocating an event buffer in accordance with the data length of the event data so as to have a minimum required memory capacity. To provide.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, the present invention has an event buffer for recording event data of events such as defective production occurring in a plurality of works on a production line, and a plurality of production lines. According to the production information record, which is the production instruction data from the upper control processing device that controls the line, in the production management device that is the middle-level control processing device that controls the lower control device that controls at least one work, A link pointer that records the order before and after an event that occurs in the same work, and a link pointer that is separate from the link pointer and that records the order before and after an event that occurs in multiple works, Is provided.

[0009]

According to the production control apparatus of the present invention, the data length of the event buffer is set to variable length data in accordance with the event data stored in the event buffer, and the same work is generated among a plurality of works in this event buffer. The link pointer that records the order before and after the event is different from the link pointer, and the event data is stored and retrieved by allocating the link pointer that records the order before and after the event that occurred in multiple works. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A production management apparatus of the present invention will be described below with reference to the accompanying drawings.

The production management apparatus of the present invention includes a host control processing apparatus WS1 for giving a production information record of the entire production line, and a production instruction for each work on the production line according to the production information record from the WS1. There is a line controller 2 which is a middle-level control processing device for giving a signal, a PLC 3 which is a lower-level control device for controlling production equipment according to a production instruction from the line controller, a robot and the like, and these are connected to each other by a LAN 5.

Further, the line controller 2 controls the PLC 3 and the robot 4 and the like according to the production information record from the WS 1, and the PLC 3 and the robot 4 are in a production abnormality such as an assembly failure or an abnormal deformation of the vehicle body during the execution of the work. Events may occur. This event may occur randomly in multiple work, PLC
3 and the robot 4 detect it as event data. In the line controller 2, the detected event data is provided with a link number in the production information record, which is fixed-length data, as shown in FIG. Set up. The event buffer which is the variable length data corresponds to the link number provided in the production information record, and the event data is written according to this link number. At this time, the event number of the event buffer in which the event data is written is the event in which the data is not written in the event buffer inside the line controller 2.
It is determined by searching No.

In the event buffer, a link pointer 1 for recording the order before and after an event occurring in the same work among a plurality of works as shown in FIG. 2 (b).
, Which is different from the link pointer 1, and is attached with a link pointer 2 for recording the order before and after the events occurring in a plurality of works.

This link pointer 2 setting method is, for example, when an event occurs in work # 20 and the event data storage destination for this event is determined to be event No90, the event No52 corresponding to the last event No52 is first set. This is done by writing "90" of the event No90 determined this time in the d section and the last event No, and by writing "52" of the last event No52 in the c section of the event No90.

The setting method of the link pointer 1 at this time is as follows: Link No. 4 of work # 20 in the production information record.
Consecutive event numbers starting from event number 4 corresponding to
"B" of "No" in the b part of the event is "90" in the b part of the event No52, and work # 2 is in the a part of the event No90.
It is performed by writing "52" of the event No52 that occurred last time at 0 in the same way as "0" in the part b. However, when the event occurs for the first time, the link number of the production information record is "0". “0” is written in part a of the event number corresponding to the set link number.

The event data which becomes unnecessary after all the works are erased in order from the link No. corresponding to the last work, and the event No. indicated by the c part of the event No. corresponding to the link No. The value of the d section at the time of erasing is written in the d section, and the value of the c section at the time of erasing is written in the c section of the event No. indicated by the d section of the event No corresponding to the link No.

The production control apparatus of the present invention configured and operated as described above is controlled as shown in the flow chart of FIG.

First, the line controller constantly monitors whether an event has occurred in the PLC 3 or the robot 4 (S10), and when the event data is transmitted from the PLC 3 or the robot 4 when the event occurs, the corresponding work in which the event has occurred. Production Information Record Link No
The event No. corresponding to the event No. is searched in sequence for the event No. b of "0" (S11).

Event data is written in the retrieved event number (S12), and a, b, c and d parts are set (S13). At this time, when all the works are not finished, the event is monitored again, and when all the works are finished (S14), the data is erased in order from the event number corresponding to the link number of the last work (S15). .

By configuring and operating in this way,
Since the production management device of the present invention has the data length of the event buffer as variable length data, the event data can be efficiently stored, and by providing the link pointers 1 and 2, desired data can be selected from all works or one work. You can search quickly.

[0021]

As described above, according to the present invention, it is possible to quickly search for desired event data by efficiently allocating the event buffer in accordance with the data length of the event data so that the minimum memory capacity is obtained. I was able to

[Brief description of drawings]

FIG. 1 is a drawing for explaining a configuration of a production management device of the present invention.

FIG. 2 is a diagram for explaining a production information record, an event buffer, and a link pointer, which are data formats of the production management apparatus of the present invention.

FIG. 3 is a flow chart for explaining control of the production management device of the present invention.

FIG. 4 is a diagram for explaining a data format of a conventional production control device.

[Explanation of symbols]

1 ... work station, 2 ... line controller, 3 ... programmable controller,
4 ... robot, 6 ... LAN.

Claims (1)

[Claims] 1. A production, which is production instruction data from a host control processing device for controlling a plurality of production lines, having an event buffer for recording event data of an event such as defective production occurring in a plurality of works on a production line. In the production management device, which is a middle-level control processing device that controls at least one lower-level control device that controls at least one work according to the information record, the order before and after the event that occurs in the same work among the plurality of works And a link pointer for recording the sequence before and after an event that has occurred in a plurality of works, and the event buffer having the event buffer provided therein. .