Boots – shoes – and leggings
Patent
1991-12-09
1994-03-29
Ruggiero, Joseph
Boots, shoes, and leggings
364192, 364DIG2, 364949, 3649269, 395275, G06F 1546, G06F 900
Patent
active
052991148
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a sequence program search method of searching for a net in the sequence program of a programmable controller (PC), and more specifically, to a sequence program search method by which a required net can be easily found when the sequence program is debugged, or the like.
1. Field of the Invention
Programs in a ladder form are widely used in the sequence programming of a programmable controller (PC), and these ladder programs are expressed in a relay logic form, where one logic line is referred to as a net.
The ladder program is created by a program creation unit, and after having been debugged, is stored in the programmable controller (PC) for use. When the ladder program is debugged, a search must be made for a required net.
For example, if a coil signal is not actuated when needed, a search must be made for a contact signal used for actuating the coil signal. Usually, this search is carried out by using the symbol or net number, or the like, of the contact signal.
Nevertheless, since respective contact signals are not always arranged sequentially, such a search takes a long time, and thus a problem arises when the sequence program is debugged. Further, when the size of the programmable controller (PC) is increased, and accordingly, the capacity of the sequence program is increased, such a search cannot be easily carried out.
In particular, in debugging a search for the same signals must be often made to confirm whether the logic of the sequence program is correct.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a sequence program search method by which a required net can be easily found due to the provision of a net mark.
To attain the above object, according to the present invention, there is provided a sequence program search method of searching for a net in the sequence program of a programmable controller (PC), comprising the steps of setting a mark for the net, if a search for the net is necessary, and searching for and displaying a next forward net with a mark, each time a forward operation key is depressed, and searching for and displaying a next backward net with a mark, each time a backward operation key is depressed.
Namely, a mark is set for a net to be searched for, e.g., a mark is set for the net of a contact signal for actuating a logic coil. Then, when the forward operation key is depressed, a next forward net with a mark is searched for and displayed, and when the backward operation key is depressed, the routine searches for a next backward net with a mark, and the net is displayed. Therefore, when marks are set for logically-related nets, reference can be easily made to the related nets, whereby the time needed for debugging and the like can be shortened.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing an example of a ladder program display screen of a sequence program search method according to the present invention;
FIG. 2 is a diagram showing an example of a directory screen;
FIG. 3 is a flowchart showing the routine for a sequence program search method according to the present invention; and
FIG. 4 is a block diagram of a program creation unit embodying the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an example of a ladder program display screen of a sequence program search method according to the present invention. A sequence program in a ladder form is displayed at a ladder program display screen 7a, where 10a, 10b and 10c designate net numbers. First, a cursor 11 is moved or set to a net number 06, to which a mark is to be set, and then a mark set key 13b, such as a soft key, is depressed, whereby a mark 12a is set for the net number 06. In the same way, when the cursor 11 is set to a net number 08 (10c) and the mark set key 13b is depressed, a mark 12b is set for the net number 08.
Next, for example,
REFERENCES:
patent: 4292666 (1981-09-01), Hill et al.
patent: 4636977 (1987-01-01), Ikemoto et al.
patent: 4991076 (1991-02-01), Zifferer et al.
patent: 5113359 (1992-05-01), Kiya et al.
patent: 5126956 (1992-06-01), Komiya et al.
Hakoshima Masashi
Onishi Yasushi
Fanuc Ltd.
Ruggiero Joseph
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