Sequence block display system

Details Sequence block display system Sequence block display system

1974-05-20

1976-06-15

Morrison, Malcolm A.

Communications: electrical

Digital comparator systems

23515111, G06F 314

Patent

active

039640264

ABSTRACT:
In a programmable logic controller in which the control sequence for a controlled-objective such as a machine tool is stored in a memory unit, and the controlled-objective is automatically operated in a predetermined sequence according to the control sequence stored in the memory unit; a display system is provided in which a sequence block obtained from the control sequence stored in the memory unit is displayed in the form of a sequence diagram, particularly, a sequence diagram which includes symbols of control elements such as relays. A necessary sequence block is automatically obtained from the control sequence and is displayed. This display system is capable of displaying the states of the control elements, such as the on-off states of relay contacts.

REFERENCES:
patent: 3593316 (1971-07-01), Frieband et al.
patent: 3706075 (1972-12-01), Fredrickson et al.
patent: 3803559 (1974-04-01), Bandoo et al.
patent: 3829842 (1974-08-01), Langdon et al.

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