JPH0543451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the control of a system that produces many types of products through a plurality of work stations.
In particular, it relates to a production progress control method suitable for taking countermeasures in immediate response to production fluctuations.

[Background of the invention]

In the conventional method, for example, as described in Japanese Patent Publication No. 56-46619, a microcomputer is used to perform calculations based on input standard pitch time data and work performance data, and calculate work time and actual work output. , Selectively output standard pitch time, etc.
A device is known that performs measurement for production control by displaying information. However, the items that can be measured with such devices are limited to data related to the progress status such as the amount of digestion work, and they only display the calculated data, so they cannot measure production information that changes between each process (failure of equipment). (e.g., emergency work interruptions, etc.) were not immediately reflected in the schedule plan.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned conventional problems and provide a production progress control method that can immediately and economically take measures commensurate with production fluctuations after collecting fluctuating production information. It's about doing.

[Summary of the invention]

In the present invention, production fluctuations are grasped by collecting actual results, and actual values are coded by checking with target values.
Consider countermeasures in advance and refer to the table that you have prepared. For fluctuations that can be handled within a process, limit the information to only that process, and avoid any changes that may affect the work order of other processes or When making a request, by sending information to each process,
The system is designed to respond to changes in production.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system configuration diagram showing an example of an apparatus for implementing the present invention. In FIG. 1, 1 is a control device, 2 is an input device, and 3 is a work instruction device, which are installed corresponding to each work station. Further, 9 is a host computer that manages and centrally controls each device of these work stations. The input device 2 and the work instruction device 3 are connected to the control device 1 by a signal line 8, and the control device 1 and the host computer 9 are connected to each other via a transceiver cable 7 and a transceiver 6 for communication with a terminal resistor 5. The configuration is such that they are connected by a line 4. This equipment configuration has a control device 1 for each process, and is a distributed computer system. The contents of the performance data processed by the control device 1 are the performance content flag (work start, completion, stop, recovery, work arrival, etc.), lot number, and time at the time of input.
The contents outputted by the work instruction device 3 are instructions to each process (responses to the previous process, reminders for production preparation, information on changing the work order). These points are detailed in Japanese Patent Application No. 1983-3431 (filed on January 13, 1982), which was previously filed by the present applicant.

FIG. 2 shows a functional configuration diagram mainly including the control device 1 in FIG. 1. FIG. 4 is a flowchart for explaining the operation.

In Fig. 2, the control device 1 is a device using a microcomputer, etc., and 11 is a RAM.
A function 11-a that stores production schedule data related to the work station in the production schedule planned by the host computer 9, and a function 11-a that stores the production schedule data for the relevant work station in the production schedule planned by the host computer 9; It has a function 11-b for storing the amount of work and time deviation relative to the scheduled number of days for completing the work), and a function 11-c for storing work performance data regarding the work station. Reference numeral 12 denotes a ROM, which includes a pace calculation program 12-a that calculates the production progress pace of the work station from actual performance data, a code conversion program 12-b that expresses the pace in code, and a program that is set by the user in advance. A table of countermeasures for the code (Danger table Fig. 3) 12-c and a judgment program 12-d that compares the code and the table and selects a countermeasure.
and a program 12-b for changing the work order (given as production schedule data) within the work station. 13
is a communication control section, which has a data receiving function 13-a and a data transmitting function 13-b for data communication with the control device 1 and host computer 9 of each work station. And these RAM11, RAM
12. The communication control unit 13 is connected to a central processing unit (not shown) via a bus, and is processed according to the flow shown in FIG.

FIG. 3 shows a conceptual diagram of the decision table 12-c in FIG. 2. The code is -1, 0, 1
The work waiting time Q, which indicates the production pace, is a three-value value.
There are 3 ³ = 27 ways to code the amount of work to be completed U and the time difference D relative to the scheduled number of days for completing the work. In addition, as a countermeasure for when an abnormality occurs in the base, dispatching rules for determining the work order, reminders to other work stations, requests to change the work order, etc. are determined. The decision table represents the presence or absence of each measure for these 27 code combinations.

Next, the operation of the functions shown in FIG. 2 will be explained based on the flowchart shown in FIG.

First, when there is a change in performance data such as work completion or equipment failure, the operation starts and the performance is captured (100). Next, the actual paces Q, U, and D are calculated from the schedule data and actual data stored in the RAM 11 according to the base calculation program stored in the ROM 12.

) Work waiting time Q: Total number of man-hours for the work waiting job for the relevant work station Q = _l 〓 ⁱ⁼¹ ST _i (1) However, J _i is the i (i = 1 to l)-th work waiting job, and b is the number of jobs waiting to be worked on, ST _i
is the number of work steps (number of work minutes) at the work station of job J _i waiting for work.

) Amount of work consumed U: Total number of work man-hours completed at the relevant work station from the time the target base was set U= _n 〓 ^j=1 ST _j )/t (2) However, J _j is changed to j (j=1 ~m)-th work completed job, m is the number of completed jobs ST _j is the number of man-hours (work minutes) of the corresponding work station of the completed job J _j , and t is the work completion time of job J _n (target-based setting). (assuming the time is 0).

) Time lag D relative to the scheduled number of days for work completion:
The average value of the deviation between the scheduled and completion dates of jobs completed within a certain period of time at the relevant station. Here, J _k is the k (k = 1 to n) job that has completed work, n is the number of jobs that have completed work, t _k is the work completion time of job J _k that has completed work, and t _d is the schedule of job J _k that has completed work. The work completion time is displayed.

Calculate the above three things and use this on an actual basis (Q,
U and D) (200).

Next, according to the code exchange program 12-b, the target base calculated in advance based on the schedule data given from the host system is compared with the actual base calculated as described above, and the results are coded.
The components Q, U, and D representing the target base each have a range, and when the target value and the actual value are compared and the actual value is smaller, it is assumed that a negative abnormality has occurred in the base, and -1 is set for the actual value. If it is larger, it is assumed that a positive abnormality has occurred and is set as 1, and if it satisfies the target base, it is judged as normal and 0 is set as each code.
The production status of the station will be understood by coding (300).

Then, the determination program 12-d compares the three codes Q, U, and D with the decision table 12-c to select a countermeasure. For example, as shown in Figure 3, if (Q, U, D) = (0, 0, 1), it is determined that the delivery date is delayed, and the dispatching rule is set to the maximum delivery date in the countermeasure table. The instruction A to change to the priority one and the instruction c to urge the work station in the previous process to send the work early are also, for example, (Q, U, D) = (-
1, 0, 0), it is determined that it is waiting for work,
In the countermeasure table, instruction B is given to urge the work station in the previous process to send work quickly. Therefore, if the instruction A to change the dispatching rule is selected, the work order of the target work in the work station is determined according to the dispatching rule. here,
If there is a change in the work order, the production schedule data will be changed, so the work station information for the previous and subsequent processes is transmitted. Furthermore, if instructions B and C for reminder or preparation reminder are selected for the work station of another process, information is transmitted to that process (400).

Next, if performance data is input from the input device 2 or the like, the process is repeated, and if not, the process ends (500).

In addition, although the above-mentioned example explained a distributed computer system, as another implementation form,
FIG. 5 can also be considered as an example. In FIG. 5, the equipment configuration is the same as that in FIG. 1, but each control device 1 and a host computer 9 are connected via a communication line 4 in a centralized manner. In the equipment configuration shown in Figure 1, each control device 1
However, in the equipment configuration shown in FIG. 5, when the control devices 1 transmit and receive data to each other, the host computer 9 is always used.

〔Effect of the invention〕

According to the present invention, production fluctuations, that is, deviations from target values, can be detected by collecting actual results each time work is completed in each process, and by capturing them in code, it is easy to correspond with the decision table. Excellent responsiveness. This has the effect that production information that fluctuates between each process (equipment failures, emergency work interruptions, etc.) can be immediately reflected in the schedule plan.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a distributed autonomous computer system using computers installed in each process, FIG. 2 is a functional configuration diagram of a control device according to an embodiment of the present invention, and FIG. 3 is a conceptual diagram of a decision table. FIG. 4 is a flowchart of the program stored in FIG. 2, and FIG. 5 is a diagram of another embodiment of the distributed system configuration. DESCRIPTION OF SYMBOLS 1...Control device, 2...Input device, 3...Work display (output) device, 4...Communication line, 5...Terminal resistor, 6
...Transceiver, 7...Transceiver cable, 8
...Signal line, 9...Upper computer, 11...RAM, 12
...ROM, 13...communication control section.

Claims (1)

[Scope of Claims] 1. In a production system in which each of many types of products undergoes work at a plurality of work stations to complete the product, performance data and production schedules obtained at the work stations are provided. From the planning data, the production progress is expressed as a pace, and by comparing it with the target pace, depending on the abnormality occurrence situation, the production progress is expressed as a pace. For abnormalities that can be handled, the information is kept within the station, and when requesting work to other work stations, the information is sent to each work station so that each work station can independently manage the production system. A production progress control method characterized by responding to production abnormalities. 2. Production progress control according to claim 1, characterized in that the pace representing the production progress is coded to pattern the production progress, and countermeasures for each pattern are provided in the form of a table. Method.