US Patent 11372796 Bus subscriber and method for operating a bus subscriber

A device, having a safe state, is coupleable to a communication bus. The device includes a first logic unit; a second logic unit; a monitoring circuit; a transmission unit; and a first test line. The device is adapted such that the first logic unit communicates with a bus via the transmission unit in a communication phase and the monitoring circuit emits a monitoring signal to the transmission unit upon a fault so that the transmission unit blocks the communication. The first and/or the second logic unit is coupled to the monitoring circuit via the first test line so as to emit a first test signal to the monitoring circuit.