Network comprising a plurality of network nodes for media access checks
First Claim
1. A network comprising a plurality of intercoupled network nodes, characterized in that the network nodes, controlled by a respective bus guardian, send messages during an assigned time slot and receive messages outside this time slot, in that each network node contains a test signal generator which delivers a test signal outside the assigned time slot, and in that each network node contains a test signal detector which, after receiving a test signal from at least another network node outside the time slot, detects that there is a defective circuit portion in the assigned network node and/or in at least another network node, the test signal detector is also provided for directly receiving the test signal of the assigned test signal generator and in that a control unit in a network nodereceives and evaluates the detection results of the test signal detector andestablishes that a circuit portion in the assigned network node is defective when only during the assigned time slot the assigned test signal generator and another network node deliver a test signal andestablishes that a circuit portion in at least another network node is defective when during the assigned and the other time slot at least another network node delivers a test signal.
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Abstract
The invention relates to a network comprising a plurality of intercoupled network nodes. Controlled by a bus guardian the network nodes transmit messages during a respectively assigned time slot and receive messages from other network nodes outside this time slot. Each network node comprises a test signal generator which delivers a test signal outside the respectively assigned time slot, and includes a test signal detector which detects outside the respective time slot, after receiving a test signal from at least another network node, that there is a defective circuit portion in the assigned network node and/or in at least another network node.
54 Citations
7 Claims
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1. A network comprising a plurality of intercoupled network nodes, characterized in that the network nodes, controlled by a respective bus guardian, send messages during an assigned time slot and receive messages outside this time slot, in that each network node contains a test signal generator which delivers a test signal outside the assigned time slot, and in that each network node contains a test signal detector which, after receiving a test signal from at least another network node outside the time slot, detects that there is a defective circuit portion in the assigned network node and/or in at least another network node, the test signal detector is also provided for directly receiving the test signal of the assigned test signal generator and in that a control unit in a network node
receives and evaluates the detection results of the test signal detector and establishes that a circuit portion in the assigned network node is defective when only during the assigned time slot the assigned test signal generator and another network node deliver a test signal and establishes that a circuit portion in at least another network node is defective when during the assigned and the other time slot at least another network node delivers a test signal.
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4. A network comprising a plurality of intercoupled network nodes, characterized in that the network nodes, controlled by a respective bus guardian, send messages during an assigned time slot and receive messages outside this time slot,
in that each network node contains a test signal generator which delivers a test signal outside the assigned time slot, and in that each network node contains a test signal detector which, after receiving a test signal from at least another network node outside the time slot, detects that there is a defective circuit portion in the assigned network node and/or in at least another network node, in that at least part of the network nodes are directly intercoupled via at least one star node, in that the star node comprises a plurality of star interfaces which are assigned to at least one network node, in that a respective star interface in dependence on a pilot signal transfers a message from the assigned network node to the other star interfaces or from another star interface to at least one of the assigned network nodes, in that more than one star interface are assigned to at least one network node, of which only one interface transfers messages in dependence on the status of the assigned network node.
Specification