Siemens Aktiengesellschaft

Kay Grammatke

Raimund Kram

Tino Heber

Horst Stiehler

Joachim Ebermann

There is described a method and a device for positioning an element of a machine. A setpoint position variable is generated, said setpoint position variable is reduced by means of a limiting variable and a modified setpoint position variable which is forwarded as a setpoint variable to a controller for positioning the element is formed in this manner. An expected setpoint position variable is determined from the modified setpoint position variable, the braking distance of the element is determined from the expected setpoint position variable, and a braking process of the element is initiated if the braking distance matches a target position which is reduced by the expected setpoint position variable. An element of a machine can so be positioned with accuracy.

Method and facility for positioning an element of a machine

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, ts) is determined from at least two previous samples (AT, AT, AT-AT) 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-ts) can likewise be determined with the aid of a mathematical approximation function and the samples (AT, AT, AT-AT). A timing mechanism can be started in the predicted sampling cycle (Ato A) preceding the threshold value crossing (SD-SD) using a time difference (ZD-ZD) remaining until the threshold value crossing (SD-SD). The threshold value crossing time (ts-ts) is determined once again using a further, subsequent sample (AT, AT, AT-AT) and the approximation function, and the remaining time difference (ZD-ZD) of the timing mechanism is adapted once again if necessary.

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Hartmannsdorf, Germany

Kay Grammatke