Method for reliable high-performance recording of process data with numerically controlled industrial processing machines

Process data are recorded by accumulating process data in a delay-time critical cyclic time plane-e.g., a main processor clock-and storing the accumulated data in an data buffer memory having a FIFO characteristic using a cyclic clock. The data buffer memory is read out in a delay-time uncritical acyclic time plane-e.g., a pre-process clock-and the read out data are processed and stored as data sets in a log memory. To achieve synchronous recording of process data of different time planes, such as process data generated in a cyclic interpolator time plane and a cyclic position control time plane, the process data for position control are accumulated over the time interval of an interpolation clock cycle and provided synchronously with the data of the interpolator for recording.