US Patent No. 9,128,839

NUMERICAL CONTROL SYSTEM HAVING REMOVABLE FILTER CIRCUIT


Patent No. 9,128,839
Issue Date September 08, 2015
Title Numerical Control System Having Removable Filter Circuit
Inventorship Yuuji Sone, Minamitsuru-gun (JP)
Hiroshige Andou, Minamitsuru-gun (JP)
Assignee FANUC Corporation, Minamitsuru-gun, Yamanashi (JP)

Claim of US Patent No. 9,128,839

1. A numerical control system, comprising:
a plurality of data communication apparatuses; and
a numerical controller that transmits and receives data to and from the data communication apparatuses,
wherein each of the data communication apparatuses includes:
a filter circuit removably attached to a connection unit for connection with the numerical controller or another data communication
apparatus that is connected before the data communication apparatus, and/or a connection unit for connection with another
data communication apparatus that is connected after the data communication apparatus;

a data transfer error detection unit that detects a data transfer error or a sign of the data transfer error as error information;
and

a data transmission unit that transmits the error information detected by the data transfer error detection unit to the numerical
controller, and

the numerical controller includes:
a filter circuit removably attached to the connection unit for connection with the data communication apparatus;
a data transfer error detection unit that detects a data transfer error or a sign of the data transfer error as error information;
an error information storage unit that stores the error information detected by the data transfer error detection unit of
the numerical controller and the error information received from the data communication apparatus, in association with the
numerical controller or the data communication apparatus in which the error information has occurred;

a filter circuit replacement determination unit that specifies a filter circuit, which needs to be replaced, of the filter
circuits provided in the numerical controller and the data communication apparatus from the error information stored in the
error information storage unit;

an output unit that outputs information prompting replacement of a filter circuit specified on the basis of a determination
result of the filter circuit replacement determination unit; and

a filter information storage unit that stores noise immunity levels of a plurality of filter circuits,
wherein the filter circuit replacement determination unit specifies the noise immunity level of a filter circuit, which is
to be replaced, from the error information and the noise immunity levels, and when the output unit outputs the information
prompting the replacement of the filter circuit, information of a filter circuit having noise immunity specified on a basis
of a determination result of the filter circuit replacement determination unit is output.