Fanuc Corporation

Hiroshi Noda

Hiroshige Ando

Kouji Hada

Koichi Murata

Hideaki Inoue

Yuji Sone

Kazuhiko Miura

Each of the host transmitting/receiving blocks of a plurality of I/O units connected to a CNC reads the destination specification data and a diagnostic result bit each time the host transmitting/receiving block receives a signal packet from the CNC. When the diagnostic result bit indicates the execution of a diagnosis, the signal packet contains diagnostic DO data, and the relevant DO signal output terminal is short-circuited to the relevant DI signal input terminal to form a diagnostic loop. The diagnostic packet signal passes through the diagnostic loop, the external signal transmitting/receiving block, and the host transmitting/receiving block and returns to the CNC through the host transmitting/receiving block of an adjacent I/O unit closer to the CNC. The CNC analyzes the packet signal to determine whether each of the I/O units is operating normally or not.

Method and system for diagnosing external signal input/output units

A numerical controller in which group IDs are automatically allocated to I/O units so that the group IDs and addresses can be set automatically even when a system configuration is changed in response to detection of a configuration error. When a power of the numerical controller is turned on, group IDs are successively allocated to I/O units with distance from the numerical controller, and types of the I/O units are stored. Initial values of the group IDs allocated when the power is turned on for the first time after a system of the numerical controller is constructed, and addresses for the allocated group IDs are stored. An alarm is issued if the types and number of units for the group IDs automatically allocated for the second or later time of starting the numerical controller are different from the initial values.

Numerical controller managing multiple input/output units that automatically allocate and stores group IDs for the input/output units

The numerical control apparatus includes a numerical control part for outputting a move command, one motor control part for generating a PWM signal for a plurality of motors based on the move command from the numerical control part, and a plurality of motor amplfiers for driving the respective motors based on the PWM signal from the motor control part. The motor control part and the plurality of motor amplifiers are placed on a power panel, and the numerical control part and the motor control part are connected by a serial communication line.

Numerical control apparatus

A personal computer incorporated in a numerical control device (CNC) has a function for emulating a CNC display circuit. This personal computer emulates a CNC display circuit and converts a transmitted display command A into a video signal for transmission to display means. The numerical control device (CNC) incorporating this personal computer need not to provide a display circuit for each of the CNC body and the personal computer, and, moreover, a switching circuit for selectively receiving the video signals from two display circuits and transmitting selected signal to the display means is not required either. Furthermore, the personal computer has a function for emulating a data input/output circuit of CNC. The personal computer inputs or outputs data transmitted from the CNC or data to be transmitted to the CNC, from or to a data input/output circuit in the personal computer to or from an external input/output device, through an input/output data RAM. Therefore, it is not necessary to provide data input/output circuits for both the CNC body and the personal computer.

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Yamanashi, Japan

Hiroshi Noda