JP2771017B2 - production management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention is used, for example, in an automobile production line or the like that mixes and produces different types of machines, and distributes information of processing contents using a network, and The present invention relates to a production management system that instructs processing such as welding for each model, for each derivative, for each unit, and executes the processing.

2. Description of the Related Art In a production line or the like, a processing machine is arranged at a predetermined position and performs various processes on a workpiece moving along the line. By the way, when different types of vehicles and the like are produced on the same line as in the case of an automobile production line, each processing machine must perform processing according to the types of vehicles and the like. Further, it is necessary to perform a process of converting the processing order information into a model pattern for performing a process corresponding to the type of the machine of each processing machine. Furthermore, since the information on the processing order is mixed and complicated, it is necessary to perform processing for organizing and collecting the information into the information of each processing machine.

For this reason, the operator in the conventional machining process first sorts and summarizes the information on the machining order into order data of each machining process unit as shown in FIG. After converting the data into a model pattern, the model pattern is input to the processing machine, and the work is set on the processing machine based on the ranking data. These are the first and second conversion processes by a person. The ranking data is based on the model (year, manufacturing factory, 2
Doors, 4 doors, etc.), derivation (grade), options (presence / absence of sunroof, etc.), rod numbers (numbers assigned for each predetermined number), numerical values for the predetermined number, etc., are arranged according to the processing order. It is a thing. On the other hand, the processing machine is arranged in the area of the production line, and when a model pattern is input by an operator, a code for determining an operation is created using a conversion table stored therein, and according to the code, Perform processing. This is the third conversion processing by (M / C). The code includes the number and operation pattern of the processing jig, the job number (operation pattern, welding condition number, etc.) of the robot, and the like.

For example, in a processing step of welding a side panel to a floor panel, information of a processing order is converted into order data of the processing step, and further converted into a model pattern,
Input to the processing machine. After that, based on the ranking data, take out the side panel suitable for the model, derivation, etc. from the mounting place and set it on the jig, while the processing machine creates the code for deciding the operation based on the model pattern Weld necessary parts to the floor panel and assemble the floor panel and side panel.

In addition, the work of converting the order information into a model pattern for integrating the order data into processing process units is changed when a model change of a vehicle type or the like occurs. Conduct education. Further, when the processing information is changed due to an order from a user, reprocessing, or the like, the changed order information is transmitted to the processing step each time.

[Problems to be Solved by the Invention] However, in such a conventional production line, in each processing machine arranged in the line area, an operator (person) collects and converts the processing order information. As a result, human errors occur, the efficiency of production management is low, and the number of man-hours is increased despite the automation line.

In addition, the work of the aggregation and conversion of the ranking information changes depending on the model change of the vehicle type, etc.However, in the case of a car line that produces a different model, the model change of the vehicle type is complicated, so every change is required. The number of man-hours for training the operators to be performed increases, and the efficiency of production management decreases. Further, the order information is changed by an order received from a user, reworked, or the like. However, the order information has been frequently changed due to factors such as a reduction in manufacturing lead time in recent years. At this time, every time a change is made, it is necessary to transmit the contents of the change of the order information to each process, so that the flow of the entire production management is not smooth and the efficiency is reduced.

In addition, each production line cannot efficiently perform terminal-specific processing that is not included in the processing order.
There was a problem that the efficiency of production management for line processing was poor.

Specifically, each line has a model, a derivative code, an option code, an M / C model operation pattern code, etc. as conversion codes for processing information, but these are simply handled as data by the operator and input to the processing machine. Therefore, the processing unique to the terminal cannot be automatically interrupted, and the efficiency of production management has been reduced.

Therefore, the present invention enables the reduction of man-hours of the operator, and also improves the operability of the line by accepting an interruption to the processing contents and efficiently performing processing such as terminal-specific processing, thereby improving the efficiency of the automated line system. The purpose is to provide a production management system that can realize the construction and increase the efficiency of production management.

[Means for Solving the Problems] In order to achieve the above object, the production management system according to the present invention, as shown in FIG. A production line b that conveys between processing steps in a predetermined order for each predetermined number
In addition to setting and storing processing contents related to the processing order and the like for each predetermined number of models and each derivation for the workpiece a on the production line b, and distributing information of the processing contents using a network And a middle controller d that creates a conversion file that divides the information of the processing order into machine type derivations for each processing step of the production line, and distributes the conversion file to the upper controller c. And information of the processing content from the upper controller c,
Receiving the conversion file, converting the processing content information into processing instruction information for each processing step based on the conversion file, and providing a lower-order controller e for giving a processing instruction;
That performs predetermined processing corresponding to each model, each derivation, and the like in a predetermined order on a predetermined number of workpieces a based on a processing instruction from a lower-level controller e. Execution means f, and display means i attached to the processing execution means f capable of accepting an interruption from outside in response to a given processing instruction.

In a preferred embodiment, the display means i attached to the processing execution means f accepts, as an external interrupt, a change in the processing order of the workpiece a.

The display means i attached to the processing execution means f accepts the setting of the M / C operation pattern and the number of processed parts by an operator (operator) as an external interrupt.

The display means i attached to the processing execution means f automatically displays the model, derivation and options of the workpiece a.

The display means i attached to the processing execution means f displays data received as an external interrupt.

[Operation] In the present invention, the processing contents are set and stored for each predetermined number of models and for each derivation of the workpiece a by the higher-level controller c, and this information is stored in a plurality of lower-levels using a network. Distributed to the controller e. In addition, a conversion file is created in the middle controller d that is classified into machine type derivation sections for each machining process, and the conversion file is distributed to the upper controller c. The lower controller e analyzes the processing instruction corresponding to the processing content for each different model based on the conversion file received from the higher controller c, and gives the processing instruction to the processing execution means f. Is performed. At this time, the display means i attached to the processing execution means f can accept an interruption from the outside for the processing contents.

Therefore, the processing contents and the conversion file for the workpiece a are collectively managed by the higher-order controller c, and the number of steps for inputting or changing the processing order and the conversion file is reduced. In addition, processing such as terminal-specific processing is efficiently performed by an external interruption to the display means i attached to the processing execution means f, and the efficiency of production management for line processing is improved.

Hereinafter, the present invention will be described with reference to the drawings.

2 to 12 are diagrams showing an embodiment of the production management system according to the present invention.

First, the configuration will be described. FIG. 2 is a schematic configuration diagram showing a network in a welding section of an automobile production line to which the present invention is applied. In this figure, 1 is a host computer (upper controller) as a processing order file computer, 2C, 2D, and 2E are derived centralized maintenance computers (middle controller), 2A and 2B are line area computers (lower controller), Reference numerals 3 and 3A denote networks, for example, the network 3 has a total of 44 nodes as nodes, and the personal computer network 3A has a total of 6 communication terminals. 4A-4X
Is a sequencer (processing means) of the terminal, and is composed of a welding robot or the like that performs welding processing. Reference numeral 5 denotes a production line, which places each body (workpiece) 6 including a different model on a carrier trolley (not shown) and transports each of the bodies in a predetermined order from a loading section to a delivery section. Production line 5
Is, for each step of the welding process, as shown in FIG.
A large number of lines 203 to 212 are provided, and processing information is aggregated for each line.

The host computer 1 receives, for example, weekly processing order data from an external computer, checks a joint of the processing order data, stores the data, and distributes the processing order data to the line area computers 2A and 2B. That is, for each body 6 on the production line 5, the processing order is set and stored for each predetermined number of models and for each model derivation, etc., and information of the processing content is distributed through the networks 3 and 3A, and the processing information is separated for each line. Distribute files for aggregation. As the aggregation setting of the processing information for each line, for example, setting of a model-specific derived aggregation code for each line,
It sets the option code for each line, sets the M / C operation pattern code for each line, sets the work material code for each line, sets the representative value of the consolidated code for each line, and so on. The model-specific derivation aggregation code is a code with a large digit to identify the type of vehicle and to indicate two-door, four-door, overseas, domestic, etc. In some cases, the derived aggregate code for each model is simplified until it can be used in a line.

A predetermined number of the bodies 6 are arranged on the production line 5 in a predetermined order, and the processing content for each body 6 is determined and loaded in the host computer 1 in advance, for example, on a weekly basis. Further, the information of the host computer 1 is transferred in a constantly communicating state to 2E, one of the derivative centralized maintenance computers, through the personal computer network 3A to back up the data. In other words, 2E, one of the derivative centralized maintenance computers, stores data and has an alternative function. Further, the switching to the alternative machine is performed by the switching device 10. Further, the derivative aggregation maintenance computers 2C, 2D, and 2E create a conversion file that divides the information of the processing order into a model derivation section for each processing step of the production line 5 and distributes the conversion file to the host computer 1. Further, the converted file delivered to the host computer 1 is backed up at the same level by 2E, which is one of the derivative aggregation maintenance computers in a constantly communicating state. That is, the host computer 1 stores data as a function of a file server, and 2E, which is one of the derivative centralized maintenance computers, stores data of the host computer 1 at the same level as an alternative function. Also,
Among the derivative aggregate maintenance computers, 2C and 2D have a function of converting processing order information into processing instruction information, which will be described later, as an alternative function to the line area computers 2A and 2B. That is, in the derivative aggregate maintenance computers 2C and 2D, after replacement with the line area computers 2A and 2B and distribution of the processing order information from the host computer 1, the functions as the line area computers are satisfied. .

The host computer 1 has a disk drive device 11, a printer 12, a keyboard 13 and a CRT display 14 as auxiliary devices, which are connected to the other computer 2C.
The same applies to the above (however, others are not shown).

The information from the derivative aggregation maintenance computers 2C, 2D, 2E is stored once in the host computer 1 and then input to the line area computers 2A, 2B via the network 3A.
Receiving the processing order information and the conversion file from
The processing order information is converted into processing instruction information for each processing step based on the conversion file, and processing instructions corresponding to processing contents for each body 6 for different models, different derivatives, etc. are output to the sequencers 4A to 4X for each line. . The derived centralized maintenance computer 2C has a disk drive device 21 as an accessory device,
It has a printer 22, a keyboard 23 and a CRT display 24, which is the same for the other derivative centralized maintenance computer 2D and line area computers 2A and 2B (others are not shown).

25 is a transceiver of the personal computer network 26,
The coding is omitted for other transceivers to avoid complications.

The sequencers 4A to 4X are arranged in the area of the production line 5, and a predetermined number corresponding to each model in the order in which the predetermined number of each body 6 is arranged based on a processing instruction from the line area computers 2A and 2B. Is performed for each line. The computer graphics CRTs 400A to 400X are attached to the sequencers 4A to 4X, and display the processing instruction information and the data such as the process status.

Here, the network of the processing instruction system can be easily understood as shown in FIG. In the figure, 1A is an external computer that performs information processing such as creation of weekly processing order data, 1 is a processing order file computer as a host computer, 2C, 2D, and 2E are derived aggregate maintenance computers, 2A and 2B are line area computers, 2G is a performance monitor computer, 2H is a performance data collection controller, 4A to 4X are M / C controllers as sequencers, 400
A to 400X are computer graphic CRTs.

31-35 are performance monitoring computers, network 3
, The process status of each process is received. The data of the process status is measured by the sequencers 4A to 4X performing a predetermined welding process. Tact equivalent to the cumulative number of machining and machining time per unit, and sequencers 4A to 4X
The status monitor computer receives the status signal of automatic / manual, cutting and change signals, and the remaining number of machines which are updated each time a predetermined welding process is completed. In addition, using the calculation result of the total number of machines processed in the own process and the total number of machines processed in the next process as the number of flows of a specific line from the process status data, the data including at least the number of flows is networked. 3 to each process. These are arranged in, for example, an office, a maintenance department, a planning room, a warehouse, and the like, and display the processing results in real time. The performance monitor computer 31 has a main body 41, a printer 42, a keyboard 43, and a CRT display 44, and the same applies to other performance monitor computers (however, other symbols are omitted). 51 is a line server in the network 3 and 52 is a power supply device.

The information handled by the network 3 includes the following information.

Machining instruction Actual number of machines Line stop time Line tact: Machining time per unit number Flow between lines: Relationship between the cumulative number of own process and the cumulative number of next process.

Line automatic operation signal: Includes channel, manual, and abnormal signals.

Maintenance notification signal Construction notification signal Line status signal Next, the operation of this embodiment with the above configuration will be described.

In the production process for welding, first an external computer
For example, the processing contents (particularly, processing order) of the body 6 are determined and sent in units of one week from the host computer 1 to the host computer 1, and are loaded in the host computer 1 in advance. This information is used for setting and supplementing the processing order for each body 6 on the production line 5 for each predetermined number of models, for each model, for each derivative, and the like.
It is distributed to the line area computers 2A and 2B via 3A. The information includes, for example, the model of the body 6 (the model name of the body and whether it is a 4-door or 2-door, etc.), derivative information (destination country, destination: cold district, etc.), and optional information (such as the presence or absence of a sunroof, etc.). ) Etc. are included. These correspond to, for example, a model-specific derivation aggregation code and an option code for each line.

In addition, the setting of the model-specific derivative aggregation code for each line is performed by the derivative aggregation maintenance computers 2C, 2D, and 2E. In particular, the processing order information is classified into a model derivation section for each machining process of the production line 5, and the like. This conversion file is created as a file, distributed to the host computer 1, stored in the host computer 1 as setting data, and further distributed to the line area computers 2A and 2B.

Next, the processing order information and the conversion file from the host computer 1 are analyzed by the line area computers 2A and 2B, and processing instructions corresponding to the processing contents for each body 6 for different models, different derivatives, etc.
Output to 4A ~ 4X. On the other hand, on the production line 5, each body 6 including different models is placed on a transport trolley from the input section to the output section, and is transported every predetermined number in a predetermined order. Then, based on the processing instructions summarized by line, the sequencers 4A to 4X use a predetermined number of the respective bodies 6 placed on the production line 5 in the order in which they are arranged, for each model, for each derivative, etc. A corresponding predetermined welding process is performed for each line.

At this time, the host computer 1
An external interrupt is always possible, for example, there are the following external interrupts.

# 1) The processing content of each body 6 is changed.

# 2) The operator sets the M / C operation pattern and the number of machines processed.

This is performed by switching the screens of the computer graphics CRTs 400A to 400X attached to the sequencers 4A to 4X to the setting screens, and setting the number of patterns using a cursor and fiction keys, for example. Note that the above item # 1 is also executed by the same operation.

# 3) Automatic display of the model, derivation and options of each body 6 is performed.

This searches and displays the model, derivative, and option based on the representative value of the M / C pattern. The representative value of the M / C pattern is transmitted by the host computer 1 as a file server via the line area computers 2A and 2B, and stored in a file in the M / C controllers (sequencers 4A to 4X).

The display and the calculation in the interrupt are executed by, for example, the M / C controller and the CRT.

The display contents of the computer graphics CRT 400A to 400X include, for example, data of processing information for each line, aggregation of processing information for each line, distribution of the next process status and flow number using the network 3, and measurement of the number of processing and tact in M / C processing. is there. Further, as display data, each body 6 on each production line 5 is displayed.
The data after derivation and aggregation of the model type and the remaining number of machining are treated as the current rod (the meaning of the rod will be described later), the next rod, and the reserved rod.

FIG. 4 shows a specific example of the welding process.
At 06, the rear frame, rear floor panel, front wheel house, front floor, rear floor and front comp were assembled (component: COMP).
In step 107, the rear floor is inspected, and in steps 108 and 109, the rear floor, front floor, and front comp are respectively carried out. In step 110, the assembled parts are transported,
In step 111, the floor is assembled. Next, in step 112, processing of sub-main general welding (SMGW) is performed. Prior to this process, in steps 114 to 118, the 2F
Execute download (DL) to. That is, step 11
In step 4, the roof is lowered from 2F to 1F. In steps 115 and 116, the left and right sides of the rear inner panel are lowered, and in steps 117 and 118, the left and right sides of the side panel are lowered. Step 11
At 9 and 120, lower the left and right of the pillar inner similarly. Next, in step 121, additional welding is performed on the sub main general welding, and similarly in step 122.
Performs additional beating by spot welding robot (SR).
Next, final MIG welding is performed in step 123, and if necessary, a spot welding supplementary step (supplementation step by a person in the event of a robot trouble) is performed in step 124, and a door or the like is attached in step 125. In steps 126 to 132, the bonnet is assembled, the trunk is assembled, the left and right front doors and the left and right rear doors are assembled, and the left and right huenders are assembled. Will be

FIG. 5 shows the state of each line in the production line 5, and lines 203 to 212 are provided around the management office 201 and the maintenance section 202 for each welding process.
In the figure, a black portion is a portion where welding is automatically performed, and a hatched portion is a portion where welding is performed manually or a switch is in an “OFF” state. In addition, the white portions are portions where the jig replacement (CH) according to the model change is performed.

Here, in the distribution of the next process status and the number of processing flows using the network 3, for example, setting of a next process node number and a name, data reception from the next process, and the like are performed. As a specific example of such a processing situation, for example, the number of flows between lines is shown as in FIG. In the measurement of the number of machines and the tact corresponding to the machining time per unit in the M / C machining, setting of the number of machines, setting of the tact measurement, storage of the number of machines and tact measurement data, and the like are performed. In the setting of the number of units, you can select the M / C operation mode (manual / automatic change), whether or not the number of units can be counted depending on the presence or absence of a work,
Selects the number count timing in the M / C1 cycle. The measurement of the tact is basically the same as the processing number count timing, and the measurement and data storage of the number of machines and the tact are data communication that can be communicated on the network 3 (for example, writing to a register circuit). In the calculation of the number of units in the processing order data, each time one unit is processed, the number of processed units is stored as the remaining number of units, and the number of processed units per day is stored as the cumulative number data. The deletion of the cumulative number is automatically performed at the beginning of the day.

As a specific example of such a processing situation, for example, the flow number between lines is shown in FIG. 6, the remaining number of processing lots is shown in FIG. 7, a list of cumulative processing numbers is shown in FIG. Shown respectively. In this case, the display usually
The whole integrated screen shown in FIG. 8 is displayed. When "roof" is designated on the screen, a detailed screen shown in FIG. 9 is displayed.

Furthermore, the measured value of the process tact by line is
It is shown as in Figure 10. In FIG. 10, each column is the first,
2 shows the time histories, and the tact result is shown in the order of the numbers. As an example, the required processing time of the first, fifth and fourteenth machines is picked up in the figure.

For the processing lots (corresponding to a group of groups defined in each body 6), the data after derivation and aggregation and the remaining number are displayed as current rods, next rods, and reserved rods by computer graphics CRT400A to 400X.

Specific displays include, for example, the following items, which are shown as a processing instruction screen as shown in FIG.

-Only the current rod is displayed in different colors.

-The data of the current rod is deleted when the remaining number of the current rods becomes 0 or less.

-There are cases of automatic deletion and cases of deletion by the operator's start button.

・ After deleting the current rod, the next rod is displayed as the current rod.

・ Similarly, the reservation rod is displayed as the next rod.

・ In the reservation rod, the data held in the terminal is displayed sequentially.

-Request data from the line area computer at the timing when there is no more data displayed on the reservation rod.

・ For terminal-owned data that is not displayed on the reservation rod, only the presence or absence of the data is displayed on the screen (up to 10 lines).

・ Data stored in the terminal including the current rod is stored in the M / C controller.

-Enable manual correction only for the remaining number of rods.

In the processing instruction screen shown in FIG. 11, the setting screen (308)
Can be changed, the setting of each part of (302) to (307) can be changed.

Furthermore, when the number of units is selected in the interrupt,
As shown in the interrupt screen in the figure, the model, derivation, and option name corresponding to (302) are automatically displayed, and are not color-coded on the current rod, but are performed at the interrupt. Similarly, when the number is selected in the interruption, the subtraction of the remaining number is not performed by the current rod, but is performed by the interruption. When the number of interrupts is reduced to 0 or less, data is erased by an automatic or activation push button.

Considering the effect of this embodiment, the following is obtained.

(I) The processing order data and the conversion file for the body 6 are collectively managed by the host computer 1 as an upper controller, and the processing order data is analyzed for each line by the line area computers 2A and 2B as lower controllers. Since the data is consolidated, unlike the conventional method where the operator analyzes and consolidates the processing data each time, it is possible to reduce man-hours for inputting or changing or analyzing the processing order and conversion file, and consolidating, The efficiency of production management can be improved. As a result, it is possible to realize an efficient automated line system.

(II) Further, since it is possible to accept an interrupt from the outside of the processing contents and to perform automatic display, automatic subtraction, etc., it is possible to efficiently deal with a change in the processing order. Also, terminal-specific processing that is not included in the processing order, such as service part processing, trial processing, KD processing, waste product reprocessing, and the like can be performed by interruption from the outside.
Therefore, the system can be operated while maintaining the automation of the processing system.

(III) In addition, it is possible to realize the delegation of authority (uniqueness) and the support function (automation) to the operator.

In the above embodiment, welding is performed as a process on a workpiece, but the present invention is not limited to this, and can be applied to other processes, such as assembly.
Further, the workpiece is not limited to the body of the vehicle, but may be another object.

[Effect] According to the present invention, the processing order data and the conversion file for the workpiece are collectively managed by the upper controller, and the data is analyzed and aggregated by the lower controller. Can be reduced,
The efficiency of production management can be improved.

In addition, since external interrupts are accepted for the processing instruction content given from the lower-level controller, and automatic display and automatic subtraction are performed, it is possible to efficiently perform processing changes and terminal-specific processing. it can. as a result,
The system can be operated while maintaining the automation of the processing system, and a highly efficient automated line system can be constructed, and the efficiency of production management can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a basic conceptual diagram of the present invention, FIGS. 2 to 12 are diagrams showing an embodiment of a production management system according to the present invention, and FIG. FIG. 3 is a schematic diagram showing a computer network of the machining instruction system, FIG. 4 is a diagram showing specific steps of the welding process, and FIG. 5 is a production line of the network. FIG. 6 is a diagram showing a specific example of the number of inter-line flows, FIG. 7 is a diagram showing the number of remaining processing lots, FIG. 8 is a diagram showing a list of the cumulative number of processing, FIG. 9 is a diagram showing a list of the actual number of processed machines, FIG. 10 is a diagram showing measured values of the process tact, FIG. 11 is a diagram showing the machining instruction screen, FIG. 12 is a diagram showing the interrupt screen, FIG. 13 is a diagram for explaining the processing order of the conventional production management system. 1 ... host computer (upper controller), 2C, 2D, 2E ... derived centralized maintenance computer (middle controller), 2A, 2B ... line area computer (lower controller), 3 ... network, 3A ... ... PC network, 4A ~ 4X ... Sequencer (processing means), 5 ... Production line, 6 ... Body (workpiece), 10 ... Switcher, 11, 21 ... Disk drive device, 12,22 , 42 ... Printer, 13,23,43 ... Keyboard, 14,24,44 ... CRT display, 25 ... Transceiver, 26 ... PC net, 31-35 ... Result monitor computer, 41 ... Main unit, 51: Line server, 52: Power supply device, 400A to 400X: Display panel (display means).

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G05B 15/02 G05B 19/418 G06F 17/60 B23Q 41/08

Claims (5)

(57) [Claims] 1. A production line for transporting workpieces including different types of machines from a feeding section to a delivery section in a predetermined order at a predetermined number of times between processing steps, and a predetermined number of workpieces on the production line. For each model,
For each derivation, etc., set and store the processing contents related to the processing order and the like, and distribute the information of the processing contents using a network, a higher-level controller, and the processing order information for each processing step of the production line. Create a conversion file to be classified into model-derived sections, etc., distribute the conversion file to a higher-level controller, receive information on the processing contents from the higher-level controller, and the conversion file, and receive the conversion file. The information is converted into processing instruction information for each processing step based on the conversion file, and a lower-level controller that gives a processing instruction, and a predetermined number of objects to be processed are arranged in the area of the production line and based on the processing instruction from the lower-level controller. Processing execution means for executing predetermined processing corresponding to each model, each derivative, etc. in the processing order with respect to the processing object; A production management system comprising: a display unit attached to a processing execution unit capable of accepting an external interrupt in response to an instruction. 2. The display means attached to the processing execution means,
2. The production management system according to claim 1, wherein the setting of the processing content of the workpiece is accepted as an external interrupt. 3. The display means attached to the processing execution means,
2. The production management system according to claim 1, wherein the setting of the M / C operation pattern and the number of processed units by an operator is accepted as an external interrupt. 4. The display means attached to the processing execution means,
2. The production management system according to claim 1, wherein a model, a derivative, and an option of the workpiece are automatically displayed. 5. The display means attached to the processing execution means,
2. The production management system according to claim 1, wherein data received as an external interrupt is displayed.