Programmable logic controller, central processing unit, and recording medium
AssigneeMitsubishi Electric Corporation
InventorsHiroyuki OZAWA, Yuki HIDAKA, Chiaki KATAOKA
Life of this patent
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Abstract
Central processing units can perform factory automation control independently of each other. A first output selector selects to stop or not to stop an operation of a second central processing unit when a voltage drop in an internal power supply in a first central processing unit is detected. A first reset signal output controller stops the operation of the second central processing unit when the first output selector selects to stop the operation of the second central processing unit, and does not stop the operation of the second central processing unit when the first output selector selects not to stop the operation of the second central processing unit.
Claims6
A programmable logic controller including a first central processing unit and a second central processing unit capable of controlling a control target device independently of each other, the programmable logic controller comprising:
- processing circuitry;
- and
- a transmitter-receiver, wherein
- the first central processing unit includes an outputter to output, to the second central processing unit, an operation determination signal for determining that the first central processing unit is in operation when a voltage drop in an internal power supply in the first central processing unit is not detected, and
- the processing circuitry
- selects to stop or not to stop an operation of the second central processing unit when the second central processing unit does not acquire the operation determination signal, and
- stops the operation of the second central processing unit when the processing circuitry selects to stop the operation of the second central processing unit, and does not stop the operation of the second central processing unit when the processing circuitry selects not to stop the operation of the second central processing unit.
-6. (canceled)
A central processing unit capable of controlling a control target device independently of another central processing unit mounted on a programmable logic controller, the central processing unit comprising:
- processing circuitry;
- and
- a transmitter-receiver, wherein
- the processing circuitry
- selects to stop or not to stop an operation of the central processing unit when an operation determination signal for determining that the another central processing unit is in operation is not acquired from the another central processing unit;
- and
- stops the operation of the central processing unit when the operation determination signal is not acquired from the another central processing unit and the processing circuitry selects to stop the operation of the central processing unit, and does not stop the operation of the central processing unit when the operation determination signal is not acquired from the another central processing unit and the processing circuitry selects not to stop the operation of the central processing unit.
(canceled)
A non-transitory computer-readable recording medium storing a program, the program causing a programmable logic controller including a first central processing unit and a second central processing unit mounted on the programmable logic controller to execute processing comprising:
- selecting to stop or not to stop an operation of the second central processing unit when an operation determination signal for determining that the first central processing unit is in operation is not acquired from the first central processing unit;
- and
- controlling the second central processing unit to stop operating when to stop the operation of the second central processing unit is selected, and controlling the second central processing unit not to stop operating when not to stop the operation of the second central processing unit is selected.
Dependencies are inferred from the claim text.