BUS SUBSCRIBER AND METHOD FOR OPERATING A BUS SUBSCRIBER
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.