SU408276A1 - VPTB - Google Patents

Description

PROGRAM CONTROL SYSTEM

one

The invention relates to the field of automatic control and is intended for use in numerical control systems for machine tools.

Known contour software control systems contain a main program input device and an interpolator whose output is connected to a drive control unit. However, these systems feature low productivity and processing accuracy. The proposed system contains two commutators, a reversible loop counter, a cyclic program input device, subprogram number controler circuit, a zero indication circuit, an inverter and two keys, the output of the main program input device connected to the first switch, the outputs of which are connected respectively to the interpolator, control circuit the numbers of the subroutines and the summing input of the reversible loop counter, the output of the input device of the cyclic subroutines is connected to the second switch, the outputs of which are connected respectively etstvenno to the interpolator, the control room circuitry routines and subtraction input of a reversing cycle counter, the trigger output of the interpolator via the keys, and a stop output is directly connected to respective inputs of the input device of the main program and cyclic programs.

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The output of the zero indication circuit is connected via an inverter to the control input of one key and directly to the control input of another key, and the input of this circuit is connected to the output of the reversible loop counter. This allows for increased productivity and processing accuracy.

The drawing shows a functional diagram of the described system. The system includes the main program input device 1, switch 2, subroutine number control circuit 3, reversible loop counter 4, interpolator 5, drive control unit 6, cyclic subroutine input device 7, switch 8, zero display circuit 9, key 10, inverter 11 and key 12. The system works as follows. The part program is divided into a main program and a series of cyclic subroutines. The main program contains information necessary for processing non-repeating parts of the part, as well as information on the numbers of the subprograms and the number of repetitions (cycles) of the subprogram. The subroutines contain the information necessary to handle repetitive sites. Each program is assigned a specific number, which is stamped in the first frame. Each subroutine loops. When the system is turned on, the loop counter is 4

is in the zero state, while the output of the circuit 9 is a signal that opens the key 10. After the signal from the interpolator 5 starts the input device to the inputs of the keys 10, 12, the device 1 is switched on, because the key 10 is open and the key 12 is closed.

The information from the output of the input device 1 is fed to the input of the switch 2. Information about the movement of the tool comes from the switch 2 to the input of the interpolator 5. If the frame contains information about the number of the subroutine that needs to be installed in the additional input device 7, it goes to the control circuit 3 At the same time, the subroutine died is displayed on a special display. After the input of each frame is completed, the interpolator gives a signal to stop the input device, which stops device 1. Information transformed into interpolator 5 is received by the input of the control circuit of the drive 6. After the processing of each frame is completed, the interpolator gives a signal to start the input device, which Having passed through key 10, it starts up input device 1. At the same time, the system processes the part according to the main program. This continues until the frame in which the number of cycles other than 0 is written. This number comes from the output of switch 2 to counter 4. The signal at the output of circuit 9 disappears, with the result that key 10 closes and key 12 opens.

The next start signal coming from the interpolator includes an additional input device 7. At this time, the subroutine, the number of which is displayed on the scoreboard, should be in the input device. In the first block of the subroutine, the zero displacements and the code of the subroutine number are indicated. Switch 8 transmits the unit number to circuit 3, in which the code of the subroutine number is compared with the code previously received from switch 2, and if it does not match, the control circuit generates a "prohibiton" signal that arrives at key 12 and prohibits input of the next frame of the unit. In the event that the codes match, the "no inhibit" signal will occur and the system will continue to process the part of the subroutine, with the information about the movements coming from the switch 8 to the input of the interpolator 5.

Each time the subroutine passes one full cycle, a switch from switch 8 to the subtracting input of cycle counter 4 receives a signal that reduces the contents of cycle counter 4 by one. This continues until the content of the counter is equal to zero. In this case, the key 10 is opened and the key 12 is closed, which causes the switching of the input devices, and the system continues processing through the main program until the next transition to the subroutine.

Subject invention

The contractual software control system containing the input device of the main program and the interpolator, the output of which is connected to the drive control unit, is characterized in that, in order to improve the performance and accuracy of processing, it

contains two switches, reversible loop counter, cyclic subroutine input device, subroutine number control circuit, zero display circuit, inverter and two keys, the output of the input program of the main program is connected to the first switch, the outputs of which are connected respectively to the interpolator, subroutine number control circuit and the summing input of the reversible loop counter, the output of the input device of cyclic nodirogram is connected to the second switch, the outputs of which are connected respectively to the inter half a clock, control circuit of the number of subprograms and subtractive input of the reversible counter

cycles, the starting output of the interpolator through the keys, and the output of the stop directly H1o are connected to the corresponding inputs of the input devices of the main program and cyclic subroutines, the output of the display circuit

The zero is connected via an inverter to the control input of one key and directly to the control input of another key, and the input of this circuit is connected to the output of the reversible counter of the total frequency.

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