Network system, time master station, and time slave station
AssigneeMitsubishi Electric Corporation
InventorAtsushi Yamada
Life of this patent
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Abstract
A network system includes a synchronous master device to output a cooperative-operation timing signal in a cooperative-operation cycle, a time master station connected to a network, and a time slave station connected to the network. The time master station includes a master clock to count a time, and a master generation unit to generate master cooperative-operation-time information on the basis of the cooperative-operation timing signal and the time counted by the master clock. The time slave station includes a slave clock to count a time, and a slave generation unit to generate slave cooperative-operation-time information on the basis of the master cooperative-operation-time information and the time counted by the slave clock.
Claims9
A network system comprising:
- a synchronous master device to output a cooperative-operation timing signal in a cooperative-operation cycle;
- a time master station connected to a network;
- and
- a time slave station connected to the network, wherein
- the time master station includes:
- a processor to execute a program;
- and
- a memory to store the program which, when executed by the processor, performs processes of,
- counting a first counter value,
- receiving the cooperative-operation timing signal output from the synchronous master device,
- generating, on a basis of the received cooperative-operation timing signal and the counted first counter value, master cooperative-operation-time information that is information for generating slave cooperative-operation-time information indicating a reference counter value for operating a plurality of external devices in a cooperative manner, and
- transmitting the generated master cooperative-operation-time information, and
- the time slave station includes:
- a processor to execute a program;
- and
- a memory to store the program which, when executed by the processor, performs processes of,
- counting a second counter value,
- receiving the transmitted master cooperative-operation-time information,
- generating the slave cooperative-operation-time information on a basis of the received master cooperative-operation-time information, the counted second counter value, and the cooperative-operation cycle, and
- outputting a synchronization command signal to the external device on a basis of the slave cooperative-operation-time information generated by the slave generation unit.
A time master station comprising:
- a processor to execute a program;
- and
- a memory to store the program which, when executed by the processor, performs processes of,
- counting a counter value;
- receiving a cooperative-operation timing signal output in a cooperative-operation cycle;
- generating, on a basis of the received cooperative-operation timing signal and the counted counter value, master cooperative-operation-time information that indicates a reference counter value for operating a plurality of external devices in a cooperative manner;
- and
- transmitting the generated master cooperative-operation-time information, to a time slave station, wherein
- when determining that the cooperative-operation timing signal is not received, the process of generating the master cooperative-operation-time information further comprises generating the master cooperative-operation-time information on a basis of the cooperative-operation cycle and the counted counter value.
A time slave station comprising:
- a processor to execute a program;
- and
- a memory to store the program which, when executed by the processor, performs processes of,
- counting a counter value;
- receiving master cooperative-operation-time information transmitted from a time master station in a cooperative-operation cycle;
- generating, on a basis of the received master cooperative-operation-time information and the counted counter value, slave cooperative-operation-time information that indicates a reference counter value for operating a plurality of external devices in a cooperative manner;
- and
- outputting a synchronization command signal to the external device on a basis of the generated slave cooperative-operation-time information, wherein
- when determining that the master cooperative-operation-time information is not received, the process of generating the slave cooperative-operation-time information further comprises generating the slave cooperative-operation-time information on a basis of the cooperative-operation cycle and the counted counter value counted by the slave clock.
Dependencies are inferred from the claim text.