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US 11,962,425 B2Granted
Communication system
AssigneeFanuc Corporation
InventorsTeruki Nakasato, Tomomasa Nakama
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AssigneeFanuc Corporation
InventorsTeruki Nakasato, Tomomasa Nakama
Estimating the term…
A master communication device of this communication system comprises: a generation unit that generates transmission data consisting of consecutive data to all slave communication devices following one header; and a transmission unit that transmits the transmission data generated by the generation unit at the fastest cycle, among communication cycles requested by the plurality of slave communication devices. Each of the plurality of slave communication devices of the communication system comprises: a storage unit that adds information indicating reliability to data received from the master communication device and stores the same; a comparison unit that compares the reliability of subsequently received data and the reliability of the data stored in the storage unit; and a selection unit that selects the data stored in the storage unit if the reliability of the data stored in the storage unit is higher than the reliability of the data subsequently received by the comparison unit.
A communication system in which a plurality of slave communication devices are connected in a daisy chain to a master communication device,
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
No references of this kind are recorded.
Arrangements for detecting or preventing errors in the information received: using redundant apparatus to increase reliability
Bus networks: with centralised control, e.g. polling
Bus transfer protocol, e.g. handshake; Synchronisation: on a daisy chain bus
Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location: arrangements specific…
About 14 years 4 months of term left · ends 4 Mar 2041 (estimated)
The present invention relates to a communication system in which a plurality of slave communication devices are connected in a daisy chain from a master communication device.
Conventionally, in such a type of communication system, a master communication device communicates with each of slave communication devices at a fixed cycle. In this case, in order to improve communication efficiency, data to be exchanged between the master communication device and the slave communication devices has a fixed structure in which one header is set and data for all the slave communication devices is linked in a subsequent stage of the header.
In the communication system, the master communication device executes transfer processing by attaching an ECC (Error-Correcting Code) to the data for each slave communication device, thereby improving reliability of the data. Patent Document 1: Japanese Unexamined Patent Application, Publication No. 2006-94302 Patent Document 2: Japanese Unexamined Patent Application, Publication No. 2002-171176
FIG. 1 is a block diagram illustrating a configuration of a communication system showing the present embodiment;
FIG. 2 is a flowchart illustrating data communication processing of the communication system showing the present embodiment;
FIG. 3 is a flowchart illustrating data communication processing of the communication system showing the present embodiment;
Embodiments of the present disclosure will be described below. First, a configuration of a communication system will be described, in which a plurality of slave communication devices are connected in a daisy chain from a master communication device, with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration of a communication system showing the present embodiment. This example shows a communication system in which a transmission-side unit 1 and a reception-side unit 2 communicate with each other via a predetermined communication path 3, while omitting an upstream side from the transmission-side unit 1 and a downstream side of the reception-side unit 2 are omitted.
In this example, the transmission-side unit 1 as a master communication device generates transmission data, and repeatedly transmits the same generated transmission data to the reception-side unit 2 as a slave communication device. A plurality of reception-side units 2 (not shown) are also connected to a subsequent stage of the reception-side unit 2.