JPH04177402A - Pc signal state display system - Google Patents

Abstract

PURPOSE:To easily grasp the tracing result and to facilitate the maintenance of a sequence program by displaying the signal ON/OFF state on a ladder diagram in the desired timing designated on a time chart. CONSTITUTION:A designated ladder diagram 2 and a designated time chart 3 are shown on a display screen 1 of a display device with operations of a keyboard. The diagram 2 consists of the contacts A, B and C and a coil D. The chart 3 shows a part of the result that is obtained by tracing the ON/OFF states of the contacts A-C and the coil D in terms of time. If the ON/OFF state is needed in the timing (t) of the coil D, a cursor 4 is set at the timing (t). So that the ON/OFF states of the contacts A-C and the coil D are displayed on a ladder sequence.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a PC signal status display method controlled by a ladder diagram, and in particular to a PC signal status display method that allows the change status of PC signals to be confirmed on the display screen. Related to signal status display method.

[Conventional technology]

Conventionally, signal states on a PC have been displayed by displaying a desired ladder diagram on a display screen to display changing states of signals while the PC is operating.

In addition, a so-called tracing method was also used in which the changing states of this signal were sequentially stored in a memory and repeated on a display screen for later confirmation.

[Problem to be solved by the invention]

However, with the method of displaying signal status only using a ladder diagram,
This method has the problem of not being able to adequately handle cases where the signal changes quickly, and making it difficult for the operator to check the trace results.

The present invention has been made in view of these points, and is based on P.
An object of the present invention is to provide a signal state display method for a PC that can display the on/off state of a signal processed by a PC in an easy-to-understand manner to an operator.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a method for displaying the signal status of a PC (programmable controller) to check the change state of a specific signal in a PC (programmable controller). The on/off states of the signals are sequentially stored in a memory, a desired ladder diagram is displayed on the display screen, the on/off states of the signals in the ladder diagram are read out from the memory, and the read on/off states are read out from the memory. Displaying the time chart in the off state on the same display screen as the ladder diagram,
A PC characterized in that a desired timing is specified on the time chart, and an on/off state of the signal at the specified timing is displayed on the ladder diagram.
A signal status display method is provided.

[Effect]

The desired ladder diagram and the time chart corresponding to the signal state are displayed on the same display screen, and by specifying the desired timing on the time chart, the on/off state of the signal at that timing is displayed on the ladder diagram. be done.

Therefore, since the signal state at the timing desired by the operator is displayed, the trace result is easy to understand.

〔Example〕

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

FIG. 3 shows a numerical control device (CNC) for implementing the present invention.
) is a block diagram of the entire hardware. A PMC (programmable machine controller) 20 is built into the numerical control device (CNC) 10. Processor 11
is a processor that plays a central role in controlling the entire numerical control device (CNC) 10, reads out the system program stored in the ROM 1'3 via the bus 19, and executes the entire numerical control device (CNC) 10 according to this system program. control.

The shared RAM 12 is a RAM for exchanging data between the CPUI 1 and the CPU 21.
Data is exchanged with each other via . It also stores data necessary for access from both sides at the same time.

The RAM 14 stores temporary calculation data, display data, etc. The CMO 3l 5 is configured as a nonvolatile memory, and stores the tool correction amount, pitch error correction amount, cutting program, parameters, and the like. CMO3 is backed up by a battery (not shown) and is connected to a numerical controller (C
Since it is a non-volatile memory even if the power of the NC) 10 is turned off, the data is retained as is. Further, the CMO 315 also stores parameters and the like 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 image signals and outputs the image signals. This image signal is CRT/MD
It is sent to the display device 31 of the I unit 30, and the display device 31
will be displayed. Further, the display device 31 can also display parameters on the PMC 20 side, a ladder diagram, a time chart, etc. to be described later. Data at this time is sent from the PMC 20 via the shared RAM 12.

The interface 17 receives data from the keyboard 32 in the CRT/MDI unit 30 and sends the data to the processor 11.
give it to In addition, the data to the PMC20 side is also transferred to the keyboard 3.
2, the data can be input from shared RAM1
2, and is sent to the PMC20 side.

, The interface 18 is an interface for external devices, and is connected to external devices 40 such as a paper tape reader, a paper tape puncher, a paper tape reader/puncher, and a printer. The cannibal program is read from the paper tape reader, and the cannibal program edited in the numerical control device (CNC) 10 can be output to the paper tape puncher.

The processor 11 and elements such as the shared RAM 12 and ROM 13 are connected by a bus 19.

In the diagram, an axis control circuit for controlling a servo motor, etc., a servo amplifier, a spindle control circuit, a spindle amplifier, a manual pulse generator interface, etc. are omitted.

PMC (jlogrammable machine controller) 20
has a processor 21 for PMC, and the processor 21
is connected by bus 25 to shared RAM 12, which is coupled to bus 19 of CNCl0.

Further, a ROM 22 is coupled to the bus 25. R.O.
A management program and a sequence program for controlling the PMC 20 are stored in the M22. Sequence programs are generally created in a ladder language, but may also be created in a high-level language such as Pascal. Also, R
In some cases, a ROM cassette interface is provided in place of the OM 22, a sequence program is stored in the ROM cassette, and the sequence program is connected to the ROM cassette interface. By doing so, the sequence program can be easily upgraded or changed.

Further, a RAM 23 is coupled to the bus 25, and R
A human output signal is stored in the AM 23, and its contents are rewritten as the sequence program is executed.

The I10 control circuit 24 is connected to the bus 25 and the RAM 23
The output signal stored in the I10 unit 26 is converted into a serial signal and sent to the I10 unit 26. It also converts the serial input signal from the I10 unit 26 into a parallel signal and connects it to the bus 25.
send to The signal is sent to the RAM 2 by the processor 21.
3.

The processor 21 receives command signals such as M function commands and T function commands from the CNCID via the shared RAMI 2, and -
The command is stored in the RAM 23, processed according to the sequence program stored in the ROM 22, and outputted to the I10 unit 26 via the I10 control circuit 24. This output signal controls hydraulic equipment, pneumatic equipment, and electromagnetic equipment on the machine side.

In addition, the processor 21 receives human input signals such as machine-side limit switch signals and machine operation switch signals from the I10 unit 26, and once receives these input signals from the RA.
Store in M23. 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, the - part signals are sent to the CNC side, and the other signals are sent to the I10 control circuit (■○C) 24 as output signals.
It is output from the 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 commands are read by the processor 21, they are sent to the processor 11 via the shared RAM 12 to control the servo motor. Similarly, a spindle motor etc. can also be controlled by commands from the PMC side.

In addition, the sequence program stored in the ROM 22 and the human output signal stored in the RAM 23 are connected to the CRT/MDI.
It can be displayed on the display device 31 of the unit 30.

Furthermore, the sequence program in ROM22 is shared by R
It is possible to print out to a printer connected to the interface 18 via the AM 12 and the bus 19.

Furthermore, it is also possible to connect a program creation device to the interface 18, transfer a sequence program etc. created by the program creation device to the RAM 23, and operate the PMC 20 with the sequence program in the RAM 23.

Next, a specific example of the signal status display method of the present invention will be explained based on FIG. FIG. 1 is a diagram showing a display screen on which a ladder diagram and a time chart are displayed simultaneously. In the figure, a display screen 1 is a screen of a display device 31, and a ladder diagram 2 and a time chart 3 specified by the operation of a keyboard 32 are displayed. Ladder diagram 2 is contact ASB'J6
and C, and a coil D. Time chart 3 is
This is a part of the results of temporally tracing the on/off states of each contact A-, C, and coil D in the ladder diagram 2.

4 is a cursor, and by operating a cursor movement key on the keyboard 32, the cursor can be moved left and right to specify a desired timing on the time chart 3.

Now, if you want to know the on/off state of coil D at timing t, move the cursor 4 to timing t.

Then, the on/off states of the coil D and the contacts A to C related thereto at this timing t are displayed on the ladder sequence 2. As can be seen from time chart 3, at timing t, contacts A, B and coil D are on. Accordingly, in ladder diagram 2, these turned-on contacts A, B and coil D
are displayed as thick lines, and the lines connecting them are also displayed as thick lines. By specifying the desired timing with the cursor 4 in this manner, the on/off state of the coil D and the on/off states of the contacts A to C related thereto can be known at a glance.

On display screen 1, contacts, coils, etc. that are turned on are displayed as thick lines, but by using display attributes according to the signal status as shown in Figure 2, it is possible to display the rise or rise of each pulse in time chart 3. It is possible to display the status at the falling edge, that is, when the signal changes from off to on or from on to off.

In addition to the display attributes shown in FIG. 2, contacts, coils, etc. may be color-coded depending on the signal state.

Note that although the above explanation has been made using a PMC built into a CNC, the present invention can be similarly applied to an independent PC.

〔Effect of the invention〕

As explained above, in the present invention, the on/off state of the signal at the desired timing specified on the time chart is displayed on the ladder diagram, making it easier to understand the trace results, which makes it possible to develop and maintain sequence programs. becomes easier.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a display screen on which a ladder diagram and a time chart are displayed simultaneously, Fig. 2 is a diagram showing display attributes according to signal states, and Fig. 3 is a numerical control device for implementing the present invention ( CNC
) is a block diagram of the entire hardware. 1 - - - - Display screen 2 - - - Ladder diagram 3 Time chart 4 - - - - Cursor 10 Papa ° - Numerical control unit (CNC) 11 - - - Processor 12 ° “Shared RAM 13'... ROM 14--RAM 15 0M08 16 Graphic control circuit 17 Interface 18' Interface 19 Bus 20 PMC (Programmable Machine Controller) 21--Processor 22 °ROM 23 RAM 24 I10 control circuit 26 - ■ / 0 units 30 ・ CRT/MDI unit 31 Display device 32 Keyboard 40° External device applicant Fanuc Co., Ltd. agent Patent attorney Takeshi Hattori Figure 1

Claims (5)

[Claims] (1) In a PC signal status display method for checking the change state of a specific signal in a PC (programmable controller), the on/off status of the signal processed by the PC is sequentially stored in memory and displayed on the display screen. A desired ladder diagram is displayed on the top, the on/off states of the signals of the ladder diagram are read out from the memory, and the time charts of the read out on/off states are displayed on the same display screen as the ladder diagram. , specifying a desired timing on the time chart, and displaying the on/off state of the signal at the specified timing on the ladder diagram.
C signal status display method. (2) The PC signal status display method according to claim 1, wherein the timing is specified using a cursor. (3) The display of the on/off state of the signal on the ladder diagram is represented by the thickness of the line.
The signal status display method of the PC described. (4) In displaying the on/off state of the signal on the ladder diagram, the state in which the signal changes from off to on or from on to off is expressed by reversing the line. A signal status display method for a PC according to claim 1. (5) The PC signal status display method according to claim 1, wherein the on/off status of the signal on the ladder diagram is expressed by changing the color of the line.