Safety device and method for monitoring at least one machine

A safety device for monitoring at least one machine, wherein the safety device has at least one sensor for generating sensor data on the machine and a processing unit for the sensor data that is at least indirectly connected to the sensor and to the machine, that is configured as a performance environment having at least one computing node and that is configured to allow a plurality of logic units to run on the at least one computing node, wherein at least one logic unit is configured as a safety function unit for a safety-directed evaluation of the sensor data and at least one logic unit is configured as a diagnostic unit for monitoring the at least one safety function unit,

• wherein the at least one safety function unit is configured to transmit status messages and performance messages to the diagnostic unit;
• wherein the diagnostic unit is configured to recognize a safety-related malfunction of the safety device in a status monitoring based on statuses from the status messages and in a performance monitoring based on a performance routine from the performance messages;
• wherein the at least one logic unit, which is configured as a diagnostic unit, is simultaneously configured as a safety function unit, and the safety function unit and the diagnostic unit communicate with one another within the logic unit that is configured as a diagnostic unit.