Digital logical sequence controller
AssigneesMitsubishi Denki Kabushiki Kaisha, Nissan Motor Co., Ltd.
InventorsHaruo Koyanagi, Masayoshi Takahashi, Nobuharu Yamauchi, Masaji Matsumura, Katsuhide Morimoto
Life of this patent
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Abstract
A sequence controller of the digital logical circuit type, comprising a sequence program part and a processing circuit, wherein the desired sequence instruction is read from the sequence program part, and the sequence is processed and controlled by the processing circuit. A certain definite level is set at a branch point in an equivalent sequential circuit according to the path along which a signal of the sequential circuit is transmitted. This level and the on-off state of the branch point are stored in a memory. The given data are processed and controlled through the sequence program part and the memory.
Claims5
A sequence controller comprising:
- an input selection circuit;
- a logical processing circuit;
- an output control circuit;
- a sequence program storage circuit;
- a memory circuit;
- means connecting a plurality of input contacts to the input selection circuit;
- means connecting the input selection circuit to the logical processing circuit;
- means connecting the logical processing circuit and the memory circuit;
- means connecting the memory circuit and the logical processing circuit to the output control circuit;
- means connecting the sequence program storage circuit to the logical processing circuit;
- means connecting a plurality of output relays to the output control circuit to be controlled thereby;
- the sequence program storage circuit storing a relay sequence having branch points;
- the level of each branch point and its on-off state being stored in the memory circuit;
- whereby data from the plurality of input contacts is processed in accordance with the relay sequence stored in the sequence program storage circuit to control the output relays.
A sequence controller as claimed in claim 2 wherein the logical processing circuit comprises:
- a logical processing part for performing logical operations in accordance with a Boolean algebraic equation and
- a level processing part for processing the levels of the branch points.
Dependencies are inferred from the claim text.