Method for process-variable-dependent identification signal emission
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 previo...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | 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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