Method and device for the failsafe monitoring of the...

Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing

Reexamination Certificate

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C700S090000, C700S117000, C377S002000

Reexamination Certificate

active

06898479

ABSTRACT:
A method for the failsafe monitoring of the rotational movement of a shaft comprises a first step of picking up a characteristic pulse train with a number of pulses following one another at successive times, the time interval between the pulses is dependent on the rotational movement. A second step determines a monitoring time period and a third step monitors whether an expected pulse of the pulse train occurs within the monitoring time period. Finally, there is a fourth step of generating a control signal when the expected pulse does not occur within the monitoring time period. The mounting time period is repeatedly adapted to the time interval of the pulses during monitoring.

REFERENCES:
patent: 4517684 (1985-05-01), Fennel
patent: 4521894 (1985-06-01), Moffat
patent: 5931008 (1999-08-01), Mizutani et al.
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patent: 39 25 889 (1990-02-01), None
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patent: 0 090 717 (1983-10-01), None
patent: 6-122007 (1994-05-01), None
Sicherheitssteuerungen Systemfamilie PSS, PSS Standardfunktionsbausteine, MBS Exzenterpressen, Version 2.1, Bedienungsanleitung, Sach-Nr. 19 196; pp. 4-108-4-112.
Failsafe Function Blocks, SB 077/SB 078—Monitoring broken shearpins on eccentric presses; Pilz GmbH & Co., one (1) sheet.

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