| 摘要 |
A protective device working in a contact free manner for the securing of a danger zone of a machine or the like comprises an optical evaluation field and a control and evaluation device which allows, in addition to a securing operation, in which a warning or machine stop signal is generated as a result of a respective intrusion into the evaluation field, a cyclical operation in which a release signal is generated as a result of at least one respective intrusion into the evaluation field in order to release a respective machine cycle, with one and the same evaluation field being provided for securing operation and for cyclical operation and with the control and evaluation device being designed such that only a part of the evaluation field is monitored accordingly both for securing operation and cyclical operation.
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