JPH0223898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an inventory management device, and particularly to an inventory management device suitable for inventory management of various articles such as products and parts.

[Background of the invention]

2. Description of the Related Art In engine production lines and the like, engines that have been completed as reconditioned products are temporarily stored in a storage, and the engines in the storage are taken out from the storage as necessary. When storing an engine in a storage shed or taking an engine out of a storage shed, it is necessary to know the number of engines in stock. Therefore, conventionally, when determining the number of products in stock, for example, when determining the number of products in stock in a storage warehouse with shelves capable of storing 1,000 engines, 1,000 limit switches were placed on each shelf. However, the output of each limit switch is connected to a controller, and the controller calculates the number of products in stock based on the output signal of the limit switch. In other words, when 500 limit switches are turned on, the number of products in stock is 500.
A configuration was adopted in which each person was an individual.

In this way, a limit switch is provided for each shelf, and the number of products in stock can be determined by the output signal of the limit switch. However, the following problems occur in the conventional configuration.

(1) The same number of limit switches as shelves are required, making the shelf configuration extremely complicated.

(2) The number of signal lines connecting the limit switch and the controller is at least the same as the number of shelves, and the wiring between the shelves and the controller becomes extremely complicated.

(3) The limit switch input ports of the controller require the same number of bits as the number of shelves, which makes the hardware configuration of the controller extremely complicated.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide an inventory management device that can simplify the configuration of hardware for detecting the number of products in stock.

[Summary of the invention]

The present invention provides an incoming sensor that detects the number of articles entering a storage warehouse, an outgoing sensor that detects the number of articles leaving the storage warehouse, and a storage sensor that detects the number of articles leaving the storage warehouse when a group of articles stored in the storage warehouse reaches a predetermined number. Calculate the number of items in stock based on the inventory error check sensor that detects the error, and the detection outputs of the warehousing sensor and the warehousing sensor.
A controller that determines whether the calculated value is good or bad based on the detection output of the inventory error check sensor when the calculated value reaches a predetermined number, and notifies the result of this determination;
The invention is characterized in that the above object is achieved by an inventory management device equipped with the following.

[Embodiments of the invention]

Hereinafter, the configuration of a preferred embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of a preferred embodiment of the present invention. In FIG. 1, a limit switch 18 is provided at the entrance 14 of a shelf 12 serving as a storage for storing 800 completed engines 10 as products, for detecting the number of engines 10 that have been received by the conveyor 16. It is being shelf 12
A predetermined number of engines 10 are installed approximately in the center of the
A limit switch 20 is provided as an inventory error check sensor for detecting when the inventory reaches 400 items. In other words, the limit switch 20 is turned ON when the number of engines in stock reaches 400,
It is arranged so that it remains OFF until it reaches the number. Further, on the exit 22 side of the shelf 12, a limit switch 24 is arranged to detect the number of engines 10 that are delivered from the shelf 12. The output signals of each limit switch 18, 20, 24 are connected to the signal line 10.
0, 102, 104 to the input interface circuit 28 of the controller 26. The controller 26 includes a CPU 30, a memory 32, an input interface circuit 28, an output interface circuit 34, etc., and each part is connected by a bus line 36. The output of the output interface circuit 34 is connected to a display device 38.

The CPU 30 is a warehousing counter that counts the output signal of the limit switch 18, and the limit switch 24.
limit switch 1 based on a processing program stored in memory 32.
The inventory quantity of the engine 10 is calculated based on the output signals of the limit switches 8 and 24, and the quality of the calculated value is determined based on the output signal of the limit switch 20. This determination result is displayed on the display device 38 via the output interface circuit 34. It is configured to be displayed.

The present embodiment has the above-mentioned configuration, and its operation will be explained next based on the flowchart of FIG.

When the controller 26 is powered on and starts operating, first step 200 is performed.
In steps 202 and 204, the count value of the inventory counter is initialized to zero, and the count values of the warehousing counter and the outbound counter are initialized to zero.

Next, in step 206, it is determined based on the output signal of the limit switch 18 whether or not an interrupt signal indicating that the engine 10 has been put into storage has been generated, and when the storage of the engine 10 has started, the process moves to step 208. , the increment of the warehousing counter is started, and the process moves to step 210. In step 210, the deviation between the count values of the warehousing counter and the warehousing counter is determined, and this deviation is set as the count value of the inventory counter. Next, in step 212, it is determined whether the count value of the inventory counter has reached a predetermined count value j. This count value j is the limit switch 20
For example, when the total number of storage units on the shelf 12 is n and the limit switch 20 is disposed in the center of the shelf 12, j=
It becomes n/2. In step 212, YES
When it is determined that the limit switch 20 is ON, the process moves to step 214 and it is determined whether the limit switch 20 is ON or not.
If the limit switch 20 is not turned on in this step, an error message is displayed on the screen of the display device 38 indicating that there is an error in the number of engines 10 in stock (step 216). On the other hand, step 2
If the determination in step 14 is YES, it is determined that there is no error in the number of engines 10 in stock calculated in step 210, and the process proceeds to step 218.

In step 218, limit switch 2
It is determined whether or not an interrupt indicating the leaving of the engine 10 has occurred based on the output signal of step 220. If the determination is YES, the process moves to step 220.
At step 220, the delivery counter is incremented, and the process proceeds to step 222.
In step 222, the deviation between the count value of the warehousing counter and the count value of the warehousing counter is set as the count value of the inventory counter, and the process moves to step 224.
In step 224, as in step 212, it is determined whether the count value of the inventory counter is equal to a predetermined value j. Then, when the count value of the inventory counter is equal to the predetermined value j, the process moves to step 226, and similarly to the process of step 214, the quality of the inventory quantity calculated in step 222 is determined based on the detection output of the limit switch 20. At this time, if there is an error in the inventory quantity, proceed to step 228.
Then, an error message is displayed on the screen of the display device 38, and the operation of the controller 26 is stopped.

If NO is determined in both steps 218 and 224, or YES is determined in step 226, the processing in this routine ends.

In this way, in this embodiment, the shelves 12 can be operated without placing a limit switch in each shelf.
A limit switch is installed on the entrance and exit side of the
The number of engines 10 in stock can be calculated based on the output signals of the limit switches 18 and 24, and the hardware configuration for determining the number of engines 10 in stock can be simplified. Further, in this embodiment, since the number of engines 10 in stock is verified based on the detection output of the limit switch 20, the number of engines 10 in stock can be accurately grasped. That is, in a production factory etc., the loading and unloading of parts is normally carried out automatically, but if parts are loaded or unloaded from a place other than the loading/unloading position, or if a theft occurs, the loading/unloading of parts is stopped by the limit switch 18, 24, and the detected inventory quantity may differ from the actual inventory quantity. Therefore,
If the limit switch 20 detects the absolute number j of parts, and when the number in stock detected by the limit switches 18 and 24 reaches a predetermined number j, the quality of the detected number in stock is determined according to the output of the limit switch 20, then the number of parts in stock can be determined. can be managed accurately.

As an example of the hardware simplification in the above embodiment, if 800 engines are to be stored in the shelf 12, the conventional 800 limit switches can be reduced to 3 limit switches. Also, whereas conventionally 800 signal lines were required between the limit switch and the controller 26, this embodiment requires only 3 signal lines.
Limit switch and controller 2 with real signal line
Signal processing between 6 and 6 times can be performed. In addition, the input port of the input interface 28 of the controller 26 conventionally requires an 800-bit port, but in this embodiment it can be configured with a 3-bit port. Further, in the embodiment described above, it is possible to grasp the number of engines 10 in stock as well as the number of engines 10 that are in stock and the number of engines that are out of stock.

Further, in the above embodiment, limit switches 18, 20, and 24 are used, but if a sensor such as a barcode reader is used instead of the limit switches, the number of items in stock, the number of inputs, and the number of outputs for each type of engine 10 can be determined. The number can be accurately determined for each unit.

〔Effect of the invention〕

As explained above, according to the present invention, the number of items in stock is calculated based on the detection outputs of a pair of warehousing sensors and warehousing sensors, and the quality of the calculated value is determined based on the detection output of an inventory error check sensor. Since this determination result is notified, it is possible to accurately manage the number of items in stock and to simplify the hardware configuration, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure is a flowchart for explaining the operation of the apparatus shown in FIG. 1. 10... Engine, 12... Shelf, 16... Conveyor, 18, 20, 24... Limit switch,
26... Controller, 28... Input interface circuit, 30... CPU, 32... Memory,
34...Output interface circuit, 38...Display device.

Claims (1)

[Claims] 1. A warehousing sensor that detects the number of articles entering the storage warehouse, an outgoing sensor that detects the number of articles leaving the storage warehouse, and a sensor that detects when the number of articles stored in the storage warehouse reaches a predetermined number. The number of items in stock is calculated based on the detection outputs of the inventory error check sensor, the warehousing sensor, and the output sensor, and when the calculated value reaches a predetermined number, the calculated value is calculated based on the detection output of the inventory error check sensor. determine the quality of the
An inventory management device comprising: a controller that notifies this determination result.