JPH0442309A - Signal tracing method for cnc - Google Patents

Abstract

PURPOSE:To simplify the display the state change of a necessary signal for the useful application to the fault diagnoses, etc., by displaying the change of a trace signal together with the changing time. CONSTITUTION:A trace table 3 can contain the addresses 3a, the changing states 3b, and the changing times 3c of the trace signals. The trace signal designated through a signal designation table 2 is monitored at each fixed time, and the changed trace signal is written into the table 3. Then the changing state of the trace signal is displayed together with the changing time. Thus an operator can clearly recognize the changing process of a necessary signal for the benefit of the diagnoses of faults, the check of a sequence program, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal tracing method for a numerical control device (CNC), and particularly to a signal tracing method for a CNC that displays the time at which a trace signal changes.

[Conventional technology]

In numerical control equipment (CNC), internal signals or human output signals are displayed on the display screen for various purposes such as failure diagnosis of numerical control equipment, checking of PMC sequence/prograno, and rKMKJ of external input/output signals. It is now possible to do so.

The operator can refer to these signals to diagnose failures, check sequence programs, etc.

[Problem to be solved by the invention]

However, these display signals merely display the current signal state, and cannot know the past change state of the signal that caused the failure. Furthermore, when checking a sequence program, it is not possible to confirm past signal states that may cause the sequence program to malfunction.

The present invention has been made in view of these points, and an object of the present invention is to provide a CNC signal tracing method that can trace past signal states.

Another object of the present invention is to provide a CNC signal tracing method that can display the state of change in a trace signal together with the time of change.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a numerical control device (
In a CNC signal tracing method that traces human output signals or internal signals in time series (CNC),
A change in the trace signal is determined, and when there is a signal change in the trace signal, the trace signal and the time of change are stored in a trace table, and the trace signal is displayed on a display screen together with the time of change. CNC
A signal tracing method is provided.

[Effect]

Signals to be traced are specified, these trace signals are monitored at regular intervals, and when a change occurs, it is stored in a trace table along with the time. Meanwhile, these trace signals and change times are displayed on the display screen.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 2 shows a numerical control device (CNC) for implementing the present invention.
) is a block diagram of the hardware.

The processor 11 controls the entire numerical control device according to a system program stored in the ROM 12. ROM
12 uses EPROM or EEFROM. The RAM 13 uses SRΔM and stores various data. The nonvolatile memory 14 stores a trace table 3 that stores trace signals, which will be described later. In addition, the computer program, parameters, etc. are stored and used by the battery-backed CMO 3 and the like, and the contents are retained even after the numerical control device is powered off.

PMC (';' Logrammable Machine Controller)
15 receives commands for the M function, S function, T function, etc., decodes and processes the commands using a sequence program 15a, and outputs an output signal for controlling the machine tool. Also, in response to the limit switch signal from the machine side or the switch signal from the machine operation panel, the sequence program 1
5a and outputs an output signal to control the machine side, and the signals necessary for the numerical control device are sent to RAM 1 via bus 25.
Transfer to 3. This signal is read by processor 11.

The graphic control circuit 16 converts the contents of a trace table, which will be described later, into a display signal and sends it to the display device 16a.
It is displayed on the display device 16a. The display device 16a is a CRT,
A liquid crystal display device or the like is used. The keyboard 17 is used to input various data.

The axis control circuit 18 receives a position command from the processor 11 and outputs a speed command signal for controlling the servo motor 20 to the servo amplifier 19. The servo amplifier 19 amplifies this speed command signal and drives the servo motor 20. A pulse coder 21 that outputs a position feedback signal is coupled to the servo motor 20. The pulse coder 21 feeds back position feedback pulses to the axis control circuit 18. In addition to the pulse coder 21, a position detector such as a linear scale may be used. These elements are required for the number of axes, but since the configuration of each element is the same, only one axis is shown here.

The input/output circuit 22 exchanges input/output signals with the machine side.

That is, the 2MC 15 receives input signals from the machine side, such as limit switch signals from the machine side and switch signals from the machine mock board, and reads these signals. In addition, receiving an output signal from the PMC15 that controls the pneumatic actuator etc. on the machine side,
Output to the machine side.

The manual pulse generator 23 outputs a pulse train for precisely moving each axis according to the rotation angle, and is used to precisely position the machine. Manual pulse generator 23 is usually mounted on a machine operation panel.

In FIG. 2, the spindle control circuit, spindle amplifier, spindle motor, etc. for controlling the spindle are omitted.

Further, although there is one processor here, a multi-processor system using a plurality of processors can be used depending on the system.

FIG. 3 is a diagram showing an example of a signal specification table for specifying trace signals. The signal designation table 2 allows ten signals to be designated as trace signals. That is, the first signal specifies the signal at address X0O20,2 as a trace signal. Here, the address X means the address of a signal that is manually input from the machine side to the PMC 15 via the input/output circuit 22. The four-digit number following the X represents the signal address, and the number to the right of the decimal point represents the bit.

Also, the address Y of the third trace signal is 2MC15
It means the address of the output signal that is output from to the machine side via the input/output circuit 22.

Furthermore, the address G of the sixth trace signal is 2MC1
5 to the RAM 13. Address F of the 7th trace signal is from RAM13 to 2MC1
This means the signal transferred to 5.

In this way, in this embodiment, the input/output signals of the 2MC 15 are used as trace signals, but it is also possible to specify other signals to be stored in the RAM 13 or other signals.

FIG. 4 is a diagram showing an example of a trace table.

The trace table 3 can store the address 3a of the trace signal that has changed, the signal change state 3b, and the time 3c of the change. The change state 3b is represented by an upward arrow when the signal changes from 0 to 1, and a downward arrow when the signal changes from 1 to 0. Further, time 3c represents the elapsed time in ms from the time when tracing was started.

Here, the configuration is such that 60 trace signals can be displayed. That is, the trace signal specified in the signal specification table 2 is monitored at regular intervals, and the changed trace signal is written in the trace table 3. If the same trace signal changes, the trace signal again, the state of change, and the time of change are sequentially written into the trace table 3.

If the trace table 3 becomes full, the first trace signal written is erased, the trace signal is sequentially advanced by one address, and a new trace signal is written.

In addition, when the trace table 3 becomes full, the first written trace signal can be erased and newly changed signals can be sequentially written.

FIG. 5 is a flowchart of trace processing.

In the figure, the number following S indicates the step number.

['511] Determine whether it is race mode or not, and if it is trace mode, proceed to S2. It does not process unless it is in trace mode. The trace mode is specified by a software key as described later.

[S2] Set address number N in the signal specification table to 1. That is, tracing is started from the 1st signal in the signal specification table 2.

(S3) Determine whether the Nth trace signal has changed. If it has changed, proceed to S4; if not, proceed to S6.

[S4: Since the INth trace signal has changed, read the current time. This time becomes the change time of the Nth trace signal.

[: S5: Write the 8th IN trace signal and change time in the trace table.

[S6] Add 1 to N.

[S7: Determine whether IN is greater than or equal to 10. If it is greater than 10, the process ends because changes in trace signals in all signal specification tables 2 have been checked. If N is less than 10,
After checking the change in the next trace, the process returns to S3 and continues the process.

By performing such processing at regular intervals, the change state and change time of the trace signal are determined and written into the trace table 3. The contents of the trace table 3 can be displayed on the display screen by an operator's operation.

FIG. 1 is a diagram showing an example of displaying the contents of a trace table on a display screen. The trace screen 1 displays an address 1a, a change state 1b, and a change time 1c of the trace signal. Here, 20 trace signals are displayed on one screen, 20 trace signals can be displayed on the next screen, and 20 trace signals can be displayed on the next screen.

The change state 1b is displayed with an upward arrow and a downward arrow, similar to the trace table.

By displaying such a trace signal, the operator can clearly understand how the necessary signal changes over time. Therefore, it is useful for fault diagnosis, checking sequence programs, etc.

〔Effect of the invention〕

As described above, in the present invention, changes in the trace signal are displayed together with the time of change, so that the necessary change state of the signal can be easily displayed, which is useful for fault diagnosis and the like.

[Brief explanation of drawings]

FIG. 1 shows an example of a trace table displayed on a display screen, and FIG. 2 shows a numerical control device (CNC) for implementing the present invention.
), Figure 3 is a diagram showing an example of a signal specification table that specifies signals to be traced, Figure 4 is a diagram showing an example of a trace table, and Figure 5 is a flowchart of trace processing. . Axis control circuit Servo amplifier Servo motor Pulse coder Input/output circuit Manual pulse generator Nox 5a 6a Trace screen signal specification table Trace table processor OM AM Non-volatile memory PMC (Programmable Machine Controller) Sequence program display device keyboard Patent applicant Agent of FANUC Co., Ltd. Patent attorney Takeshi Hattori

Claims (4)

[Claims] (1) In a CNC signal tracing method that traces input/output signals or internal signals in a numerical control device (CNC) in time series, a change in the trace signal is determined, and when there is a signal change in the trace signal, the A CNC signal tracing method, characterized in that a trace signal and a time of change are stored in a trace table, and the trace signal and the time of change are displayed on a display screen. (2) The state of change in the trace signal is set to 0 when the signal logic is 0.
2. The CNC signal tracing method according to claim 1, wherein a change from 1 to 1 is indicated by an upward arrow, and a change from 1 to 0 is indicated by a downward arrow. (3) When the trace table becomes full, the trace signal written first is erased, the trace signal is sequentially advanced by one address, and a new trace signal is written. The CNC signal tracing method according to claim 1. (4) The trace signal is transmitted to the PMC from at least the machine side.
(programmable machine controller), input signal from the PMC to the CNC, the CN
2. The CNC signal tracing method according to claim 1, further comprising: an output signal from the PMC to the PMC, or an output signal from the PMC to the machine side.