| 摘要 |
<p>A system for processing MST functional instruction in a numerical control system which consists of a numerical controller (CNC, 10) and a PMC (programmable machine controller, 20). The numerical controller (10) produces strobe signals MF, SF and TF in the logic state opposite to that of completion signals MFIN, SFIN and TFIN. The PMC (20) judges that an instruction is produced when the strobe signal logic becomes opposite to the completion signal that is being produced. When the execution of MST function is finished, the completion signal is rendered in the same logic state as that of the strobe signals MF, SF and TF. When the completion signal becomes the same logic as the strobe signal, the numerical controller (10) determines that the processing of MST function is finished. Therefore, it is determined that the instruction is issued when the completion signals and the strobe signals are different from the respective output signals. Further, when the strobe signals and the completion signals are in the same logic state, it is determined that the processing is finished. Therefore, no cycle is required for confirming the signals, and the processing time is shortened.</p> |
