Patent ID: 8692420

Claim:
A safety device for multichannel controlling of a safety-related unit, comprising: a first control unit controlled by a microprocessor and having a signal generation unit for generating a first monitoring signal that indicates the current operating state of the first control unit; a second control unit; a switching unit drivable by the first and second control units that can turn on the safety-related unit or run it into a secured state, wherein the second control unit has a hardware-based switching unit that, in response to the monitoring signal, drives the switching unit in such a manner that the safety-related unit is drivable into a safe state in case of faulty operation of the first control unit, wherein the switching unit comprises a first safety relay connected to the first control unit and a second safety relay connected to the second control unit, wherein each safety relay comprises at least one normally open contact and one normally closed contact fixedly coupled to one another; and a device connected to the first safety relay and configured to apply an enable signal to the second control unit via the first safety relay only in case of a fault-free function of the first safety relay.