| 主权项 |
1. A safety switching apparatus for switching-on or switching-off a technical installation, comprising:
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 which 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 providing a second clock signal having a second clock frequency, and a current-increasing circuit having a switching element, said current-increasing circuit arranged for selectively increasing an input current into the first input, wherein 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. |
