JPH05265518A - Signal control system for pc - Google Patents

Abstract

PURPOSE:To reduce the number of program step in a sequence program by providing a function perforating the synchronization control of an output signal in a PC(programmable controller). CONSTITUTION:Primary output signals DO1a, DO2a for which processings were performed in a sequence program, are temporarily stored in an output register 1 of an input/output control circuit IOC 24. Next, the synchronization control with output signals DI1, DI2 from a machine side is performed for the signals in a timing control circuit 2 of an I/O unit 26 and the signals are outputted as output signals DO1, DO2 to the machine side.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a PC (programmable
The present invention relates to an output signal control system of a controller), and particularly to a signal control system of a PC for controlling a machine tool or the like.

[0002]

2. Description of the Related Art Conventionally, a PC for controlling a machine tool has a CN
It is connected to C and controls input / output signals to / from the machine side.
These controls are performed by the sequence program in the PC. As a sequence program, a ladder program described in a ladder format is widely used.

There are many output signals to the machine side,
It is sequentially output by the processing of the sequence program. These output signals may be output in synchronization with other signals as needed. For example, it is not necessary to turn on the output to the machine side immediately after the output signal is turned on after being processed by the sequence program, and to turn on the output to the machine side after turning on other signals. There may be. In order to synchronize these, conventionally, a sequence program has performed synchronization processing.

[0004]

However, when the number of signals for performing these synchronous controls increases, the number of program steps of the sequence program increases, the preparation labor increases, and the processing time of the sequence program also increases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a signal control system of a PC for controlling an output signal by another signal.

[0006]

According to the present invention, in order to solve the above problems, a PC (programmable controller) is used.
In a PC signal control system for controlling the output signal of the above, an output register for storing a primary output signal processed by a sequence program, and a timing control circuit for synchronously controlling and outputting the primary output signal at the timing of the control signal,
There is provided a signal control system for a PC characterized by having:

[0007]

The primary output signal processed by the sequence program is temporarily stored in the output register. Then, the primary output signal is synchronously controlled by the timing control circuit with other control signals, and is output to the machine side as an output signal.

Therefore, the step command of the sequence program for the synchronous control becomes unnecessary.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of the present invention. The primary output signals (DO1a, DO2a) processed by the ladder program, which is a kind of sequence program, are temporarily
It is stored in the output register 1 provided in the (IO control circuit) 24. Then, input signals from the machine side (DI1, D
I2), the timing control circuit 2 synchronously controls and outputs as output signals (DO1, DO2) to the machine side. The timing control circuit 2 is provided in the I / O unit 26. Details of the IOC 24 and the I / O unit 26 will be described later.

FIG. 2 is a time chart showing a first example of synchronous control of the timing control circuit. Here, the primary output signal is DO1a. Further, the input signal DI1 from the machine side is used as the control signal. The output signal to the machine side is DO1.

The primary output signal DO1a stored in the output register 1 is repeatedly turned on and off at regular intervals as shown in the figure. Then, the input signal DI1 is turned on only for a short time at constant time intervals. Here, when the primary output signal DO1a is on and the input signal DI1 is first turned on, the output signal DO1 is turned on. Then, the primary output signal DO
When 1a is turned off and the input signal DI1 is turned on, the output signal DO1 is turned off. Such control is performed by the timing control circuit.

FIG. 3 is a time chart showing a second example of the synchronous control of the timing control circuit. In the second example, the primary output signal is DO2a, the control signal is input signal DI2, and the output signal is DO2. Here, the primary output signal D
The output signal DO2 is turned on only when O2a is on and the control signal DI2 is on.

In the examples shown in FIGS. 2 and 3, the primary output signal and the output signal are described as one, but it is of course possible to control a plurality of primary output signals and output signals. Generally, many output signals are controlled synchronously.

Although the input signal is used as the synchronization control signal, another primary output signal may be used. The synchronization control shown in FIGS. 2 and 3 can be individually provided in the timing control circuit 2 by hardware. Further, when there are many output signals to be processed, it can be configured by a microprocessor and processed in the same manner as a PC.

FIG. 4 is a block diagram of the hardware of the whole numerical controller for implementing the present invention. PMC (Programmable Machine Controller) 2 as a PC
0 is built in the numerical controller (CNC) 10. The processor 11 is a central processor for controlling the entire CNC 10, reads a system program stored in the ROM 13 via the bus 19, and executes control of the entire CNC 10 according to the system program.

The shared RAM 12 is composed of the CNC 10 and the PMC 20.
RAM for exchanging data with each other, and exchanging data with each other via this shared RAM 12. At the same time, it stores the data required for access from both sides.

The RAM 14 stores temporary calculation data, display data and the like. The CMOS 15 is configured as a non-volatile memory and stores a tool correction amount, a pitch error correction amount, a machining program, parameters and the like. CMOS is backed up by a battery (not shown), CNC
Even if the power of 10 is turned off, the data is retained as it is because it is a non-volatile memory. Also, C
The MOS 15 also stores parameters necessary for the PMC 20 side.

The graphic control circuit 16 converts digital data such as the current position of each axis, alarms, parameters and image data into an image signal and outputs it. This image signal is sent to the display device 31 of the CRT / MDI unit 30,
It is displayed on the display device 31. Parameters on the PMC 20 side, ladder diagrams, etc. can also be displayed on the display device 31. The data at this time is shared R from the PMC 20.
It is sent via AM12.

The interface 17 receives data from the keyboard 32 in the CRT / MDI unit 30 and transfers it to the processor 11. Further, data to the PMC 20 side can also be input from the keyboard 32, and the data is sent to the PMC 20 side via the shared RAM 12.

The interface 18 is an interface for an external device, and is connected to an external device 33 such as a paper tape reader, a paper tape puncher, a paper tape reader / puncher, a printer or the like. The processing program is read from the paper tape reader, and the numerical controller (CNC) 10
It is possible to output the processing program edited in the paper tape puncher.

Processor 11, shared RAM 12, ROM
Elements such as 13 are connected by a bus 19. In the figure, an axis control circuit for controlling a servo motor, a servo amplifier, a spindle control circuit, a spindle amplifier, a manual pulse generator interface, etc. are omitted.

A PMC (Programmable Machine Controller) 20 has a processor 21 for performing PMC processing, and the processor 21 uses a bus 25 to share a shared RAM.
12 and the shared RAM 12 is the bus 1 of the CNC 10.
It is connected to 9.

The ROM 22 is coupled to the bus 25. The ROM 22 stores a management program and sequence program for controlling the PMC 20.
The sequence program is generally written in a ladder language, but may be written in a high-level language such as Pascal.
Further, the ROM 22 stores a message for displaying a screen as needed during the operation of the PMC 20. In some cases, instead of the ROM 22, a ROM cassette interface is provided, the sequence program is stored in the ROM cassette, and the sequence program is connected to the ROM cassette interface. By doing so, it is possible to easily upgrade the level of the sequence program or change the sequence program.

Further, a RAM 23 is coupled to the bus 25, an input / output signal is stored in the RAM 23, and its contents are rewritten as the sequence program is executed. Furthermore, a message group described later is transferred from the ROM 22 to the RAM 23 when the power of the PMC 20 is turned on.

The I / O control circuit (IOC) 24 is a bus 25.
And the output register 1 is provided as described above. Then, the primary output signal stored in the RAM 23 is converted into a serial signal and sent to the I / O unit 26. Also, a serial input signal from the I / O unit 26 is converted into a parallel signal and sent to the bus 25. The signal is stored in the RAM 23 by the processor 21.

Further, the I / O unit is provided with the timing control circuit 2 as described above, and the primary output signal is synchronously controlled by the input signal and output as the output signal.

The processor 21 receives the shared RA from the CNC 10.
A command signal such as an M function command or a T function command is received via M12, temporarily stored in the RAM 23, and the command is stored in the ROM.
22 is processed according to the sequence program stored in the I / O unit 2 via the I / O control circuit 24.
Output to 6. This output signal controls hydraulic equipment, pneumatic equipment, and electromagnetic equipment on the machine side.

Further, the processor 21 is the I / O unit 2
Upon receiving an input signal such as a limit switch signal on the machine side and a signal of an operation switch on the machine operation panel from 6, the input signal is temporarily stored in the RAM 23. Input signals that do not need to be processed by the PMC 20 are sent to the processor 11 via the shared RAM 12. The other signals are processed by the sequence program, some of the signals are output to the CNC side, and the other signals are output as I / O control circuit 24.
Output from the O unit 26 to the machine side.

On the other hand, the sequence program can include instructions for controlling the movement of each axis. When these instructions are read by the processor 21, they are sent to the processor 11 via the shared RAM 12 to control the servo motor. Similarly, the spindle motor and the like can also be controlled by a command from the PMC side.

The sequence program stored in the ROM 22 and the input / output signal stored in the RAM 23 are C
It can be displayed on the display device 31 of the RT / MDI unit 30.

Further, the sequence program of the ROM 22 can be printed out to the printer connected to the interface 18 via the shared RAM 12 and the bus 19.

Further, a program creating device is connected to the interface 18, the sequence program created by the program creating device is transferred to the RAM 23, and the RAM
It is also possible to operate the PMC 20 with a sequence program of 23.

[0033]

As described above, according to the present invention, since the timing control circuit for synchronizing the primary output signal with the other control signal is provided, the primary output signal is synchronized with the other control signal. There is no need for program steps, the sequence program can be easily created, and the processing time of the sequence program can be shortened.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the present invention.

FIG. 2 is a time chart showing a first example of synchronization control of a timing control circuit.

FIG. 3 is a time chart showing a second example of synchronization control of the timing control circuit.

FIG. 4 is a hardware block diagram of the entire numerical control device for carrying out the present invention.

[Explanation of symbols]

 1 Output Register 2 Timing Control Circuit 10 Numerical Control Unit (CNC) 11 Processor 12 Shared RAM 13 ROM 14 RAM 15 CMOS 16 Graphic Control Circuit 17 Interface 18 Interface 19 Bus 20 PMC 21 Processor 22 ROM 23 RAM 24 I / O Control Circuit 26 I / O unit

Claims (5)

[Claims] 1. A PC (programmable controller)
In a signal control system of a PC for controlling the output signal of, an output register for storing a primary output signal processed by a sequence program, and a timing control circuit for synchronously controlling and outputting the primary output signal at a timing of a control signal, A signal control system for a PC, characterized by comprising: 2. The signal control system for a PC according to claim 1, wherein the control signal is an input signal from a machine side. 3. The signal control system for a PC according to claim 1, wherein the control signal is another output signal. 4. The primary output signal is turned on, the output signal is turned on when the first control signal is turned on, and the output signal is turned off when the second control signal is turned on. The signal control system for a PC according to claim 1. 5. The signal control system for a PC according to claim 1, wherein the output signal is turned on only when the primary output signal is on and the control signal is on.