Hi, my team is using the CAN bus for the motors for the first time this season. We are using the Talon SRX. As far as I know, we have daisy-chained each talon starting from PDP to the roborio. Everything was working fine at first. Two days ago, we rewired the whole robot and now when we start the robot up, 4 talons blink alternate red for the first 30 seconds and then they start blinking alternate orange. But the other 2 talons were blinking alternate orange from the start. Once the robot is enabled the 4 talons become solid orange while the other 2 are still blinking alternate orange. Also on Phoenix Tuner, it shows only the 4 talons. Help me figure this stuff out please. Also the PCM isn’t being detected when it was put in the daisy chain. The PCM status light blinks orange when the robot starts up.
Check to ensure the jumper on the pdp is in the “on” position. After you have more than 5 CAN devices you must have a terminating resistor of approximatly 120ohm. There is one built into the pdp when you have the jumper on. Otherwise after your last device connect green to yellow through a 120ohm resistor.
^^ First, check termination. You really should have a terminated bus even with only the RIO and PDP, but the fewer items/shorter bus you have, the more likely it is that you can get away without it. The easy way to do the bus is to put the PDP and RIO at opposite ends of the bus, and move the jumper next to the CAN Weidmullers to the TERM position on the PDP.
In Tuner, verify that the four controllers all have different CAN IDs. Likley not the problem, as you had this working before rewiring, but it shouldn’t take long to be sure. If not, re-address duplicates, and try again.
Then, use the identify/strobe function in Tuner (haven’t used Tuner, so I don’t know what they called it, but I’m sure it’s there) on each of the four controllers you see. Are the two which did not come up at the far end of the chain? If so, check between the four you have working and the two which do not for a loose connection.
I agree with @GeeTwo’s method (you’re looking for the Blink button under the CAN Devices tab, select the device in the list and click Blink). Assuming the PDP is the last device on the CAN bus, does the PDP show in Tuner?
Also, since you rewired, check for a reversal of the yellow/green wires between a working Talon and a non-working Talon.
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