| 摘要 |
A method of acquiring status information of I/O units connected to a numerical controller capable of transmitting status information indicative of particulars of an abnormality occurred in any of the I/O units with less influence on an amount of transmittable information of input/output data. When an abnormality has occurred in the I/O unit, the I/O unit transmits an output signal with a status abnormality notifying bit set to a programmable controller (PC) in the numerical controller. The PC stores information indicative of I/O units in which the status abnormality has occurred as status-abnormality acquiring I/O unit information, in a storage device of the PC. The PC requests the status information to the I/O unit in which the abnormality has occurred according to the status-abnormality acquiring I/O unit information. In response to the request, the I/O unit transmits the status information to the PC. |
