SAFETY SWITCHING APPARATUS FOR SWITCHING-ON OR SWITCHING-OFF A TECHNICAL INSTALLATION

A safety switching apparatus for switching-on or switching-off a technical installation has a first input for receiving a first clock signal via a feed line, said first clock signal having a first clock frequency. A failsafe control/evaluation unit processes the first clock signal in a failsafe mann...

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Bibliographische Detailangaben
Hauptverfasser:	VEIL RICHARD, SCHWENKEL HANS
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING ELECTRIC SWITCHES ELECTRICITY EMERGENCY PROTECTIVE DEVICES FUNCTIONAL ELEMENTS OF SUCH SYSTEMS MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING RELAYS SELECTORS
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Beschreibung
Zusammenfassung:	A safety switching apparatus for switching-on or switching-off a technical installation has a first input for receiving a first clock signal via a feed line, said first clock signal having a first clock frequency. A failsafe control/evaluation unit processes the first clock signal in a failsafe manner in order to generate an output signal for switching-on or switching-off the technical installation in response to the first clock signal. A clock reference provides a second clock signal having a second clock frequency. A current-increasing circuit having a switching element is arranged for selectively increasing an input current into the first input. The switching element is coupled to the clock reference and selectively activates or deactivates the current-increasing circuit in response to the second clock frequency.