Safety control device, safety control system, and method for detecting communication error
AssigneesJtekt Corporation, ELAN Schaltelemente GmbH & Co. KG
InventorsTsutomu Araki, Hirofumi Kato, Sutemaro Kato, Michael Niehaus
Life of this patent
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Abstract
A safety control device for ensuring safety of an object to be controlled, including: communication unit which is used for communication with another safety control device and uses a frame including a test bit string T having correlation with a base bit string B; and detection unit which compares with the base bit string B the test bit string T included in a frame having been received from another safety control device, thereby determining the number of bit errors in the frame.
Claims12
A safety control device for ensuring safety of an object to be controlled, comprising:
- a controller that generates a base bit string;
- a communication unit that receives, from another safety control device, a frame including a base bit string and a test bit string having correlation with the base bit string, and communicates the frame including the test bit string having correlation with the base bit string from the 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 included in the received frame, and detects a number of bit errors in the frame.
A safety control system comprising:
- 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 comprises:
- a controller unit that generates a base bit string;
- a communication unit that receives, from another safety control device, a frame including a base bit string and a test bit string having correlation with the base bit string, and communicates the frame including the test bit string having correlation with the base bit string from 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 included in the received frame, and determines a number of bit errors in the frame.
A method for detecting an error in communication between safety control devices that ensures safety of an object to be controlled, the method comprising:
- generating a base bit string in one safety control device;
- receiving by one of the safety control devices from another of the safety control devices a frame including the base bit string and a test bit string having correlation with the 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 included in the received frame.
A method for detecting an error in communication between safety control devices that ensures safety of an object to be controlled, the method comprising:
- generating, in a first safety control device, a frame including a base bit string and a test bit string having correlation with the base bit string;
- transmitting the frame generated in the first safety control device from the first safety control device to the 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 included in the received frame with the test bit string included in the received frame.
Dependencies are inferred from the claim text.