Numerical control with DNC operation function using a variety of communication lines

摘要

A numerical controller capable of DNC operation using an NC program acquired from a host through a communication path, the numerical controller comprising: a numerical control unit that controls a machine tool based on the NC program; a plurality of communication units using different communication paths to obtain the NC program; and a DNC operation management unit that provides the NC program obtained from the communication units to the numerical control unit, wherein each of the plurality of communication units comprises: a reception data buffer storing the NC program, an NC program receiving unit that receives the NC Program receives from the host to store the NC program in the reception data buffer, wherein the DNC operation management unit takes over the NC program from the reception data buffer included in one of the plurality of communication units to the NC program at the numeric To provide a control unit, and a reception management unit which detects a communication error of the communication path used by the communication unit based on a remaining amount of the NC program stored in the reception data buffer of the communication unit which is a takeover target of the NC program, and a takeover target of the NC program mms switches to the receive data buffer of another communication unit when a communication error of the communication path used by a plurality of communication devices is detected.