The hardware structure of the numerical control system with online measurement and control mechanism is exactly the same as that of the traditional numerical control. The workpiece measuring instrument is used as the external device of the numerical control system, and is connected with the numerical control system through the I/0 interface circuit. The measured threshold level of the measuring instrument is used as the input switching quantity. For CNC system testing and control conditions.
Let the conditional short-circuit instruction have the format: M95Ek (k=1, 2,, n), where M95 is the conditional short-circuit instruction word, and Ek represents the condition of the kth, which can be the state of any I/O information of the system. Since the condition is satisfied or not, the algorithm of the conditional short-circuit instruction is mainly implemented in the real-time interpolation stage.
Generally, the numerical control system performs data processing on the part processing program in a flow-by-flow manner, which is roughly divided into three data processing stages: decoding, tool compensation, and interpolation. The interpolation module processes the data structure queue, which is dynamically established by the decoding and tool-compensation module for processing the part processing program piece by piece.
Without loss of generality, the vector represents the coordinate displacement of the block trajectory, regardless of the line type of the track segment. Let the coordinate displacement of the i-th block track be xei, yei, zei be recorded as Sei, here: Sei=(xei, yei, zei)XYZ, the same reason, remember that Sti is the current time of the i-th block has been completed. The coordinate displacement amount; Sri is the coordinate displacement of the current unfinished block of the i-th block; Ssum is a vector accumulator for storing the sum of the remaining coordinate displacements of the block caused by the conditional short-circuit command. The accumulator has a zero initial value when starting a new part program.
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