JPS63284604A - Programmable controller - Google Patents

Abstract

PURPOSE:To shorten the processing time with a programmable controller by showing the time needed for processing of a sequence program on a display screen and performing the prescribed processing with reference to said shown time. CONSTITUTION:A numerical control NC system consists of an NC device main body 1, a machine tool 2, a programmable controller 3, a data transfer control part 4, and a display device 5. The controller 3 consists of a computer and stores the control software CTP of a sequence program SQP, etc. into a ROM 3b together with a processor 3a, etc. The program SQP is divided into a high- level program part requiring the emergency processing like an emergency stop, etc., and a low-level program part which carries out the processing based on the data received from the NC device 1, etc. Then the TOP counts the total executing time and displays it on the device 5.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a programmable control device (gologram pull controller), and in particular measures and displays the total execution time required to execute a sequence program. Regarding programmable controllers.

<Prior Art> In a numerical control system, each mechanical element of a machine tool is controlled based on commands from the NC device. And N
Control of signal transmission and reception between the C device and the machine tool is executed by a programmable controller provided on the NC device based on a sequence program.

This sequence program is a logical program of the functions of the high-power circuit that controls data exchange between the NC device side and the machine tool using instruction codes and operands, and depending on the system, the program can be quite long.

Therefore, as shown in Figure 4, the Silkens program SPR performs predetermined processing based on the program part PRI of the first rubel that requires emergency processing such as an emergency stop, and data from the machine tool and NC device. The program is divided into a second level program part PR2, which requires synchronization with these NC devices, and a third level program part PR3, which does not require synchronization and can be processed automatically by the programmable controller, such as creating messages. ing. The second level program portion PR2 is divided into a plurality of subprogram portions SPI to SPn.

In such a sequence program, when an interrupt pulse (timer interrupt) occurs at a predetermined time interval, for example, every 16 m5ec, the entire program portion PRI of the first level is executed, and after the execution of the first program portion, the second program portion is executed. Predetermined subprogram portion S P of PR2
i (i = 1, 2.

) is executed, and then the third level program portion is executed from the unexecuted position of the third level program portion PR3 for a remaining time of 16 m5ec.

When the execution of the last subprogram part of the second level is completed, the management program of the programmable controller outputs the processing results of the sequence program to the NC device and machine, and also outputs the processing results from these NC devices and machines. A new signal is stored in the built-in RAM, and the above sequence program processing is continued.

<Problem to be solved by the invention> However, a management program intervenes during the process of running a program at a certain level to a program at the next level, and during this time the sequence program is not executed. A problem arises in that the execution time of the sequence program becomes long. The conventional method requires a long processing time because there are three levels.

Another problem with conventional sequence programs is that even if the second level subprogram processing is completed in a short time due to a jump instruction, the third level program portion that does not require an emergency is executed for the remainder of the 16 m5ec. be.

From the foregoing, it is an object of the present invention to provide a goragrample control device that can shorten the processing time of a sequence program, and can also draw the time required to process a sequence program on a display screen and perform predetermined processing using the time as a reference. That is.

<Means for Solving the Problems> FIG. 1 is a block diagram of a numerical control system equipped with a programmable control device W (programmable controller) according to the present invention.

1 is an NC device, 2 is a machine tool, 3 is a phlogramaple control device Wt (phlogramaple controller),
4 is a data exchange control unit, 5 is a display device,
In the programmable controller 1-roller 3, 3a is a processor, 3b is a program 7 memory (ROM), and 3c
is a RAM, and 3d is a Dr/Do device.

Further, SQP is a sequence program, and CTP is management software.

<Function> Gologram pull con) roller 3 ha ROM 3 b
The data exchange between the NC device 1 and the machine tool 2 is controlled by the sequence program SQP stored in the .

This sequence program is divided into a high-level program portion PR1 that is always executed at predetermined time intervals and a low-level program portion PR2.

The management software 3b processes the high-level program part PRI every predetermined time (16m5ec), and the software 3a
At the same time, for the remaining time of 16m5ec, the low level program part PR2 is continuously executed from the unexecuted position, and the low level program part P
The 1.-tal time required until all R2 is executed is constantly clocked, and the minimum and maximum times are displayed on the display device 5, for example.

<Example> Fig. 1 is a block diagram of the NC system, where 1 is a numerical control device (NC device), 2 is a machine tool, 3 is a programmable control device (programmable controller), 4 is a data exchange control section, 5 is a display device.

The NC device 1 performs a predetermined N based on the NC program data.
The programmable controller 3 controls M- and S from the NC device 1 based on the sequence program SQP.
-, T- Executes predetermined sheet 1ance control according to function commands and contact signals from the machine tool 2, and outputs the processing results to N
The data is transferred to the C device 1, and each mechanical element of the machine tool 2 is controlled based on the processing results. Digital signals are exchanged between the NC device 1 and the gorogram pull controller 3 via a data exchange control section 4 that includes, for example, a common RAM and a bus control section.

The programmable controller 3 has a computer configuration, and includes a program processor 3a, a program memory 3b as a ROM, a RAM 3c, and a digital signal input/output device (DI/Do device) 3d, and the ROM 3b stores a sequence program. Management software for running SQP, the sequence program, and other processing]・ware CTP is stored in the RAM 3 cI
ζ stores data exchanged with the NC device 1 and the machine 3.

As shown in Figure 2, the sequence program SQP includes a high-level program part PRH that requires emergency processing such as an emergency stop, and processing based on data from the machine tool or NC device (synchronization processing with the NC device, etc. is required). The program is divided into a low-level program portion PRL that executes processing that can be processed automatically on the programmable controller side (no synchronization processing required), such as message creation (processing to be executed) and message creation.

The management software CTP runs the sequence program and measures the total execution time of the sequence program and displays it on the display device 5.

FIG. 3 is a flowchart of the process of the present invention, and the overall operation of FIG. 1 will be explained below according to this flowchart.

The management software CTP reads data from the NC device 1 and the machine tool 2 via the data exchange control section 4 and the DI/Do device 3d at a predetermined timing, and stores the data in the RAM 3.
In addition to storing the sequence processing result in N
Output to C device 1 and machine tool 3 (STEP 101)
.

Thereafter, when a timer interrupt (for example, occurs every 16 m5ec) occurs (step 102), the management software CTP starts timing and interrupts (step 103).
), the high-level program portion PRH in the sequence program SQP is executed based on the data stored in the RAM 3c (step 104).

When all the high-level program parts are executed, the management software CTP executes the program from the unexecuted position in the low-level program part PRL for the remaining time of 16 m5ec (step 105). Incidentally, since the unexecuted position is stored in a pointer as described later, the low level program PRL is executed from the address indicated by the pointer (see FIG. 2).

Low-level program part) River 0. During the grand prize of 1ζ, it is determined whether the program part PRL has been completely completed (step 106), and if it has not been completed, the low level program is executed until a timer interrupt occurs (step 107).
), when a timer interrupt occurs, the next address to be executed is stored in the pointer, and the processing from step 104 onwards is repeated.

On the other hand, if the processing of the low-level program portion PRL is completed in step 106, the management software CTP
stops the time measurement, and compares the measured time t with the minimum execution time T IT l +1 and the maximum execution time TMAX (both initial values are zero), and if TM, N: > t, then t →
T111 Update the minimum execution time as N, TM□〈t
If so, update the maximum execution time by going from t to T (step 1.08), and change the TMAXj TMl□ to the NC device 1.
and display it on the display device 5 (step 1
09).

<Effects of the Invention> According to the present invention, since the number of levels of a sequence program is reduced compared to the past, the time required for management software to intervene when switching levels is reduced, and the processing time of a sequence program can be shortened. The time required to execute a program skipped by an instruction can be reliably shortened.

Further, according to the present invention, since the time required to execute the sequence program is displayed, the operator can grasp the execution time, and the programmable controller can be controlled from the machine side by considering the total execution time of the sequence program. 1 - Determine the minimum duration of the contact signal output to the roller.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an NC system including a programmable control device according to the present invention, Fig. 2 is a configuration diagram of a sequence program, Fig. 3 is a flowchart of the processing of the present invention, and Fig. 4 is an explanatory diagram of a conventional method. be. 1.NG device, 2.Machine tool, 3.Programmable controller, 4.Data exchange control unit, 5.Display device, SQP.Sequence program, CTP.Management software patent applicant FANUC CORPORATION Agent Patent Attorney Chiki Saito Figure 2 Figure 4 Figure 3

Claims (1)

[Claims] In a programmable control device that has a sequence program that executes sequence processing and controls data exchange between an NC device and a machine tool, the sequence program is always executed at predetermined time intervals. The program is divided into a high-level program part and a low-level program part that is executed from an unexecuted position after the high-level program part is executed, and the total time required until all the low-level program parts are executed is measured. A programmable control device characterized by displaying information.