Leuze Lumiflex Gmbh & Co., Ltd.

Leuze Electronic Gmbh + Co Kg

Paul Haberl

Bernhard Feller

Lutz Lohmann

Hermann Haberer

Joachim Koperski

Werner Lehner

Paul Hartl

Ralf Bihr

Viktor Wursthorn

Florian Nützel

Armin Gläser

Jörg Bortz

Andreas Tull

Stephan Luthardt

A circuit arrangement for testing of a tristate detection circuit has controllable switches ( ) which simulate the three states: logical &ldquo;1&rdquo;, logical &ldquo;0&rdquo;, and high-impedance on a terminal (K ). Inputs (P , P ) from comparators ( ) of the detection circuit are set to supply voltage or to ground. Switching of the comparators ( ) on and off is checked independently of the state on the terminal (K ).

Circuit for checking a tristate detection circuit

A photoelectric barrier and operation thereof, the barrier having at least two pairs of transmitters/receivers each operating synchronously. Each of the two transmitters transmits a light signal having a specific identifier, the signal being in the form of a double pulse separated by a pause, which double pulse consists of two pulse groups each separated by a pause, and each receiver then evaluates a light signal of the associated transmitter as correctly received when at least one of the two pulse groups is recognized as valid by means of the associated identifier, in which the duration of the pulse groups and the pauses between them are established so that at most one pulse group of one double pulse of the one transmitter is superimposed with one pulse group of one double pulse of the other transmitter.

Photoelectric barrier and method for operation

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München, Germany

Paul Haberl