Conveyance system
AssigneeMurata Machinery, Ltd.
InventorKotaro Shibata
Life of this patent
Estimating the term…
Abstract
A conveyance system includes a transport vehicle configured to transport an article to or from a passive device and including a communication unit configured to communicate wirelessly with the passive device. The transport vehicle includes: a counter configured to generate a counter value corresponding to an elapsed time from a timing when reception has become impossible due to a communication failure during wireless communication with the passive device; and an output unit configured to output the counter value when a time-out error has occurred in the transport vehicle, and the counter resets the counter value whenever reception is possible.
Claims3
A conveyance system comprising a transport vehicle configured to transport an article to or from a passive device, wherein
- the transport vehicle includes:
- a communication unit configured to transmit and receive a wireless signal to and from the passive device while constantly transmitting and receiving received signal strength to and from the passive device during transfer of the article;
- a counter configured to generate a counter value corresponding to an elapsed time from a timing when the communication unit has missed receiving the received signal strength transmitted from the passive device during the transfer of the article;
- and
- an output unit configured to output the counter value when a time-out error has occurred, the time-out error being a state in which the communication unit has failed to recognize the wireless signal output by the passive device during a predetermined period of time,
- the counter resets the counter value every time the received signal strength has been received,
- the wireless signal includes an E84 signal specified in an international standard for semiconductor manufacturing equipment, and
- the output unit is configured to output the counter value only when the time-out error due to the E84 signal has occurred.
A conveyance system comprising a transport vehicle configured to transport an article to or from a passive device, wherein
- the transport vehicle includes:
- a communication unit configured to transmit and receive a wireless signal to and from the passive device while constantly transmitting and receiving received signal strength to and from the passive device during transfer of the article;
- a counter configured to generate a counter value corresponding to an elapsed time from a timing when the communication unit has missed receiving the received signal strength transmitted from the passive device during the transfer of the article;
- and
- an output unit configured to output the counter value when a time-out error has occurred, the time-out error being a state in which the communication unit has failed to recognize the wireless signal output by the passive device during a predetermined period of time,
- the counter resets the counter value every time the received signal strength has been received, and
- the counter value is the elapsed time itself.
A conveyance system comprising a transport vehicle configured to transport an article to or from a passive device, wherein
- the transport vehicle includes:
- a communication unit configured to transmit and receive a wireless signal to and from the passive device while constantly transmitting and receiving received signal strength to and from the passive device during transfer of the article;
- a counter configured to generate a counter value corresponding to an elapsed time from a timing when the communication unit has missed receiving the received signal strength transmitted from the passive device during the transfer of the article;
- and
- an output unit configured to output the counter value when a time-out error has occurred, the time-out error being a state in which the communication unit has failed to recognize the wireless signal output by the passive device during a predetermined period of time,
- the counter resets the counter value every time the received signal strength has been received, and
- the counter constantly resets the counter value during wireless communication between the transport vehicle and the passive device.
Dependencies are inferred from the claim text.