Boots – shoes – and leggings
Patent
1989-08-21
1992-05-12
Dixon, Joseph L.
Boots, shoes, and leggings
364147, 395161, G06F 1500
Patent
active
051133598
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a simulation method for a programmable controller (PC), more particularly, the present invention is directed to a simulation method for a PC which performs a logical process on a signal from a screen displaying a ladder program and a signal from a machine, and uses the result as an input signal.
A PC (programmable controller) must be connected to a machine to confirm a created ladder program, etc. If the ladder program is incomplete the machine operation is not complete, and thus only a part of the program can be simulated.
Desirably, simulators are connected to simulate a part of a program that cannot be simulated using the machine. This means that simulators should be prepared at all times, and if a large number of ladder programs are involved, it is difficult to always provide such simulators. Accordingly, a method has been employed in which the input/output is controlled by a keyboard, etc., of a program editing apparatus, to simulate the ladder program.
In the prior art method, however, since the input/output is controlled by using alphabetic or numerical keys of the keyboard, it is difficult to intuitively grasp the relationship with the ladder program, and accordingly, much time is required and setting errors frequently occur.
Further, a satisfactory simulation cannot be achieved if a simulation using a machine and a simulation using the program editing apparatus are carried out separately.
SUMMARY OF THE INVENTION
In view of the foregoing, the object of the present invention is to provide a simulation method for a PC which performs a logical process on a signal from a screen displaying a ladder program and a signal from a machine, and uses the result as an input signal.
To achieve the above object, the present invention provides a simulation method for a PC where a ladder program of a PC (programmable controller) is simulated. The method of the present invention comprises setting a cursor at a relay contact on a screen displaying a ladder program, for a directly changing an input signal, and performing a logical process on the input signal and an input signal from a machine to simulate the ladder program.
The ladder program is displayed on the screen, and the cursor can be set at a relay contact to change the same, whereby the signal to be changed can be clearly recognized, and thus the simulation efficiency is improved and errors are eliminated.
Furthermore, the input signal from the display screen displaying the ladder program and the input signal from the machine are subjected to a logical process, e.g., an AND process, and the result is used as an actual input signal. Therefore, it is possible to carry out a satisfactory simulation through a selection of the signals from the display screen and the machine .
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram of a screen displaying a ladder program according to one embodiment of the present invention;
FIG. 2 is a diagram of a process for the selection of signals from a machine and from a display screen; and
FIG. 3 is a block diagram of an arrangement of a PC (programmable controller) for carrying out the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an example of a screen displaying a ladder program according to one embodiment of the invention. In the figure, 42a denotes a display screen of a program editing apparatus, on which a ladder program is displayed, and 1 denotes a cursor which can be moved on the screen by cursor keys, not shown.
To turn on a relay contact (X3.0) 2, the cursor 1 is moved to the contact (X3.0) 2 and then an ON button of software keys 42c is pressed, whereby the contact (X3.0) 2 and a coil (Y0,0) 3 are turned ON and the corresponding line becomes a bold line. The figure shows a state after the line is changed. To turn off the contact, only an OFF button of the software keys 42c need be pressed. When the contact (X3.0) 2 is turned ON, this state is
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Fouch, W. H., "A New Generation of Programmable Controls", Plastics Engineering, vol. 31, No. 3, Mar. 1975, pp. 41-43.
Kiya Nobuyuki
Maeda Kimio
Saiki Yoshiharu
Dixon Joseph L.
Fanuc Ltd.
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