Output converting circuit for a programmable sequence controller
AssigneeToyoda Koki Kabushiki Kaisha
InventorsToshihiko Yomogida, Yasuo Suzuki
Life of this patent
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Abstract
An output circuit for a programmable sequence controller wherein a load drive element control circuit is responsive to a command signal stored in a memory circuit for controlling a load drive element connected between a load and a first electric supply. Between a power input terminal of the load drive element control circuit and a second electric supply, there is connected in series a switching element, which is switched on in response to a signal applied from a supply voltage detecting circuit only when the voltage level of the second electric supply is not lower than a level sufficient for normal and reliable operation of the load drive element control circuit.
Claims4
An output converting circuit for a programmable sequence controller wherein, in accordance with a sequence control program, the operational state of an input element is tested so as to generate a command signal to energize or deenergize a load based upon the result of the test, comprising:
- a memory circuit for storing said command signal;
- a load drive element connected between said load and a first electric supply;
- a load drive element control circuit responsive to said command signal stored in said memory circuit for controlling said load drive element;
- a switching element connected in series between a power input terminal of said load drive element control circuit and a second electric supply;
- and
- a supply voltage detecting circuit for detecting a voltage level of said second electric supply so as to output a signal to enable said switching element to switch on only when the voltage level of said second electric supply is not lower than a predetermined level sufficient for normal operation of said load drive element control circuit.
Dependencies are inferred from the claim text.