Identify one mico is off bus during two micro communication via CAN

[lijun0]

Gentleman,
I have a questyion. When one micro. is receiving message using the CAN_Rx mudular in the basic FB librey how can I identify that the sending micro. is off bus. Since I tested to see the received data remains unchanged even the sender stopps or off bus. This is a safety concern. I had tried to use the Rx (updated) but found this dioesn't tell anything (alwase in off status). Any other means to identify this status?

[lijun0]

Sorry, after further test I found it can use the updated(Rx) to identify the status.

Thanks!

[George]

If your data is really sensitive, I would prefer to add a simple counter in data. That way you can easily detect a timeout or missing data packages.

[FStelzer]

Hey,
I always use the Rx output of the block and connect this to an off delay.
Then you can define the "error detecting time.
Connect all delay outputs with an OR . Goes the output of the OR Block TRUE, you know that there is an CAN Error.

Best regards
FStelzer

[bryantmorris]

Hey,
I always use the Rx output of the block and connect this to an off delay.
Then you can define the "error detecting time.
Connect all delay outputs with an OR . Goes the output of the OR Block TRUE, you know that there is an CAN Error.

Best regards
FStelzer

This is a great idea, thank you for the input