Sequence program inputting device
AssigneeHitachi, Ltd.
InventorsYoshimitsu Ohshima, Norio Yokozawa, Masayoshi Ohzeki
Life of this patent
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Abstract
A sequence program inputting device in a programmable sequence controller includes a separate producing circuit for producing a ladder diagram to be displayed on a display screen and a separate converting circuit for converting the ladder diagram to a machine instruction sequence of the programmable sequence controller to enable independent operations of those circuits.
Claims8
A sequence program inputting device for providing a machine instruction sequence for executing controls defined by a ladder diagram to a sequence controller which provides control output signals in response to said machine instruction sequence, wherein said ladder diagram comprises a plurality of device symbols, line symbols for connecting said device symbols and reference symbols for indicating references of said device symbols, comprising:
- first means for individually manually specifying said device symbols, said line symbols and said reference symbols;
- second means for displaying patterns including a refresh memory which stores pattern codes for specifying patterns to be displayed at respective display positions;
- third means for generating pattern codes for displaying said specified symbols and for storing said generated pattern codes in said refresh memory at storing positions thereof corresponding to display positions of said specified symbols, thereby allowing said second means to display said ladder diagram, wheren said third means further includes means for generating said machine instruction sequence by decoding said pattern codes stored in said refresh memory after said ladder diagram is displayed by said second means.
A sequence program inputting device for providing a machine instruction sequence for executing controls defined by a ladder diagram to a sequence controller which provides control output signals in response to said machine instruction sequence, wherein said ladder diagram comprises a plurality of device symbols, line symbols for connecting said device symbols and reference symbols for indicating references of said device symbols, comprising:
- first means for manually specifying one of said device symbols, said line symbols and said reference symbols to generate a symbol code and a position signal of said specified symbol;
- second means for storing said symbol codes and position signals each for said specified symbol;
- third means for displaying symbol patterns in response to said stored symbol codes and at display positions corresponding to said position signals of said respective symbols, thereby displaying said display diagram;
- fourth means for generating said machine instruction sequence by decoding said symbol codes and position signals stored in said second means.
Dependencies are inferred from the claim text.