PFEA112-20 3BSE050091R20 | ABB | Analyzer monitoring nodes

Description

PFEA112-20 3BSE050091R20 | ABB | Analyzer monitoring nodes

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A functioning CAN network has at least two or more CAN nodes. If only one CAN node is working properly, its error state will enter passive error because it cannot receive confirmation responses from the other party after sending messages.

/PFEA112-20 3BSE050091R20 Solution/

PFEA112-20 3BSE050091R20 can use an analyzer to monitor the error status of nodes:

Bus Light: Enter “error active” when there are more than 96 errors

Bus Heavy: If there are more than 127 errors, enter “error passive”

Bus Off: If there are more than 255 errors, enter “bus off”
Note: If there is only one functioning CAN node and it sends a CAN message, the message will quickly be resent until it receives confirmation from another node or enters a passive error state.

The baud rate of the traditional PFEA112-20 3BSE050091R20 bus is related to its length (as shown in the table above). A baud rate of 1Mbit/s cannot exceed 40m (theoretical value) in a perfect wiring system. The maximum cable length also depends on the transceiver used. For CAN FD, the baud rate also depends on the length of the cable. Although the baud rate of CAN FD is higher, if the bus length exceeds 40 meters, the CAN message will fail because the ACK bit arrives too late.

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