| 摘要 |
The invention relates to a method for process-variable-dependent identification signal emission for a closed-loop and/or open-loop control program with cyclic sampling of process variables from a technical process. A threshold value crossing time (ts 1 , ts 3 ) is determined from at least two previous samples (AT 1 , AT 2 , AT 5 -AT 7 ) of a process variable (P). At this time, an identification signal can be triggered, which can call up a single-stage or multi-stage command sequence. The threshold value crossing time (ts 1 -ts 3 ) can likewise be determined with the aid of a mathematical approximation function and the samples (AT 1 , AT 2 , AT 5 -AT 7 ). A timing mechanism can be started in the predicted sampling cycle (A 12 to A 89 ) preceding the threshold value crossing (SD 1 -SD 3 ) using a time difference (ZD 1 -ZD 3 ) remaining until the threshold value crossing (SD 1 -SD 3 ). The threshold value crossing time (ts 1 -ts 3 ) is determined once again using a further, subsequent sample (AT 1 , AT 2 , AT 5 -AT 7 ) and the approximation function, and the remaining time difference (ZD 1 -ZD 3 ) of the timing mechanism is adapted once again if necessary.
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