Regelung der Erfassungsgeschwindigkeit

Aufgabe

Bei einer Messmaschine werden induktive Längenmesstaster simultan erfasst und die Messwerte mit einer SPS weiterverarbeitet. Sporadisch schwanken die Messwerte sehr stark, was zu höherem Ausschuss führt. Beim manuellen Nachmessen des Ausschusses stellt sich heraus, dass es sich hauptsächlich um „Pseudo-Ausschuss“ handelt.

Eine genaue Analyse bringt die Ursache ans Licht: Der Gabelstapler-Verkehr, der direkt an der Messmaschine vorbeiführt, verursacht Schwingungen, die einen „Pseudo-Ausschuss“ erzeugen.

Lösung

Das intelligente Ethernet-Längenmesssystem MSX-E3711 erfasst die induktiven Messtaster simultan. Die Parametrierung der Erfassung erfolgt mittels ModBus TCP. Die Messwerte werden anschließend per Ethernet an eine SPS weitergeleitet, die die Maschine steuert. Ein zusätzlicher Taster wird als Referenz kontinuierlich erfasst. Nähert sich ein Gabelstapler, fängt er an zu schwingen. Auch bei den anderen Messtastern fangen die Messwerte zu schwingen an, was unweigerlich zu ungenauen Messwerten führen würde.

Um die Messgenauigkeit der erfassenden Messtaster trotz Schwingung zu wahren, reduziert die SPS die Erfassungsgeschwindigkeit des MSX-E3711: per ModBus-Befehl wird die integrierte Mittelwertbildung aktiviert. Hierdurch sinkt zwar die Erfassungsgeschwindigkeit, jedoch bleibt die Präzision der Messwerte erhalten. In kritischen Fällen wird die Erfassung sogar gestoppt. Sobald der Gabelstapler die Maschine passiert hat und die Schwingung verschwunden ist, setzt die SPS per ModBus-Befehl die Messwerterfassung wieder auf die ursprünglichen Parameter zurück.

Die Messung läuft dann wieder mit maximaler Geschwindigkeit.

Somit konnte der Ausschuss aufgrund von Fehlmessungen erheblich reduziert und die Qualität und Aussagekraft der Messwerte erhöht werden.Thus the rejects due to measurement errors are considerably reduced and the quality and reliability of the measurement values is significantly increased.

Verwendete Produkte:

Regelung der Erfassungsgeschwindigkeit

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