Talon SRX Motor Controller Problem

[ozrien]

Originally Posted by FTC Team CC

Ok, thanks for the clarification. Do you guys just solder the cables to each other if they run from one SRX to the next?

Also, do you have one cable on the last SRX in the daisy chain just sticking out and not connected to anything? Or does that connect back to the RoboRio/PDP?

Thanks,
Charging Champions

Hi FTC Team CC,
This is all explained in our documentation. Please read section 1.3.2 of the Talon SRX User's Guide. I think you will find answers much faster this way instead of posting a question and waiting for responses at each step.

We do not recommend star-topology, the CD forum is filled with many threads explaining why. But ultimately it can create failure-modes that are difficult to root-cause for the inexperienced. It's not clear to me that star-top is explicitly illegal from reading R70, but again we don't recommend it.

The alternative to daisy chaining would be to create a single bus harness that the CAN nodes "tap" into via short splices. This is how CAN buses are wired in cars. However in FRC its generally more convenient to daisy chain via connectors for high-serviceability during competition season.

Many teams have wired the Talon SRX on CAN bus in the fashion we've documented with great success.

There are no crash symptoms in WPILIB caused by unpowering a Talon, nor does it impact communication with sibling Talons on the CAN bus. This is explained in section 16.6 of the Talon SRX Software reference manual. In fact this is true for all of CTRE CAN products.