PROGRAMMABLE CONTROLLER
First Claim
Patent Images
1. A safety control device for ensuring safety of an object to be controlled, comprising:
- a communication unit that communicates a frame including a test bit string having correlation with a base bit string with another safety control device; and
a detection unit that compares the test bit string included in the frame received from the another safety control device with the base bit string, and detects a number of bit errors in the frame.
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Abstract
A programmable controller having self-diagnosis unit 60 (70) for self-diagnosis, wherein the self-diagnosis unit 60 (70) comprises data storage unit 61 (71) for storing data pertaining to an inspection unit for which the inspection is completed, and inspection start unit 62 (72) for starting the inspection from the next inspection unit of the inspection unit for which the inspection is already completed at the time before the power is turned on, when performing a self-diagnosis that occurs after the power is turned on, based on the data stored in the data storage unit 61 (71).
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Citations
13 Claims
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1. A safety control device for ensuring safety of an object to be controlled, comprising:
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a communication unit that communicates a frame including a test bit string having correlation with a base bit string with another safety control device; and
a detection unit that compares the test bit string included in the frame received from the another safety control device with the base bit string, and detects a number of bit errors in the frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A safety control system comprising:
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a plurality of safety control devices for ensuring safety of objects to be controlled; and
a communication line that connects the safety control devices with each other, wherein each of the safety control devices includes;
a communication unit that communicates a frame including a test bit string having correlation with a base bit string with at least another one of the safety control devices through the communication line; and
a detection unit that compares the test bit string included in the frame received from the another safety control device with the base bit string, and determines a number of bit errors in the frame.
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12. A method for detecting an error in communication between safety control devices that ensures safety of an object to be controlled, the method comprising:
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receiving by one of the safety control devices from another of the safety control devices a frame including a test bit string having correlation with a base bit string; and
detecting a number of bit errors in the frame by comparing the test bit string included in the frame received from the another safety control device with the base bit string.
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13. A method for detecting an error in communication between safety control devices that ensures safety of an object to be controlled, the method comprising:
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generating, in a first safety control device, a frame including a test bit string having correlation with a base bit string;
transmitting the frame generated from the first safety control device to a second safety control device; and
detecting, in the second safety control device, a number of bit errors in the frame by comparing the base bit string with the test bit string included in the frame.
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Specification