Bus subscriber and method for operating a bus subscriber

Abstract

A bus subscriber includes: a first logic unit; a second logic unit; a monitoring circuit; a transmission unit; and a first test line. The bus subscriber 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.

1 . A bus subscriber, comprising:
 a first logic unit;   a second logic unit;   a monitoring circuit;   a transmission unit; and   a first test line,   wherein the bus subscriber is configured 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, and   wherein 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.   
     
     
         2 . The bus subscriber according to  claim 1 ,
 wherein the first and/or the second logic unit is configured to determine, in a test phase, whether the transmission unit receives the monitoring signal.   
     
     
         3 . The bus subscriber according to  claim 1 ,
 wherein the first and/or the second logic unit is configured to determine in the test phase whether the transmission unit blocks communication after receiving the monitoring signal.   
     
     
         4 . The bus subscriber according to  claim 1 ,
 wherein the monitoring circuit is configured to generate the monitoring signal when an error occurs due to common causes and/or a failure occurs due to common causes.   
     
     
         5 . The bus subscriber according to  claim 4 ,
 wherein a failure of the first and the second logic unit comprises a common cause failure that occurs as a result of a single fault cause or a single event.   
     
     
         6 . The bus subscriber according to  claim 1 ,
 wherein the monitoring circuit is configured to generate the monitoring signal when a supply voltage of the first and the second logic unit is outside a predetermined range.   
     
     
         7 . The bus subscriber according to  claim 1 ,
 wherein a control output of the monitoring circuit is coupled to the transmission unit via a control line of the bus subscriber so as to emit the monitoring signal to the transmission unit.   
     
     
         8 . The bus subscriber according to  claim 7 ,
 wherein the transmission unit comprises a switch arrangement that is connected to the control line on a control side.   
     
     
         9 . The bus subscriber according to  claim 1 ,
 wherein a bus connection of the first logic unit is coupled to the bus via the transmission unit and is configured to emit a connection signal to the transmission unit.   
     
     
         10 . The bus subscriber according to  claim 1 ,
 wherein the transmission unit is coupled with a signal input of the second logic unit and/or with a signal input of the first logic unit via a feedback line of the bus subscriber.   
     
     
         11 . A method of operating a bus subscriber, comprising:
 communicating between a first logic unit and a bus via a transmission unit in a communication phase;   in case of fault, emitting a monitoring signal to the transmission unit by a monitoring circuit, such that the transmission unit blocks the communication; and   emitting a first test signal by the first and/or a second logic unit via a first test line to the monitoring circuit in a test phase,   wherein the bus subscriber comprises the first and the second logic unit, the monitoring circuit, the transmission unit, and the first test line.   
     
     
         12 . The method according to  claim 11 , further comprising:
 determining in the test phase whether the transmission unit receives   the monitoring signal from the monitoring circuit.