
In short, I can't tell if these are hardware problems or software problems. It could also be that the students or mentors are downloading something that is messing them up. I have not figured out what causes this nore have I taken good enough notes to know if it is the same roboRIO or different ones that are giving me issues.


More information on faults and sticky faults is available under Faults-pcm.The roboRIO is the onboard robot computer that is responsible for reading the sensors and controling the robot. Use the Self-test Snapshot in Phoenix Tuner to inspect and clear sticky faults. It may blink orange instead to signal that a sticky fault has been logged. If the PCM CAN connection is healthy, then it should slowly blink green (when robot is disabled). If it’s just the PCM then inspect the Weidmuller CAN contacts on the PCM. If several CAN devices are also blinking red then check the CANH/CANL chain.

If these negative symptoms are noticed, recheck CAN bus harness and termination resistors. To distinguish a fault condition, confirm the PCM does appear in the configuration page, and use the Self-test Snapshot to identify which fault condition is occurring. This is important to check because a red STATUS LED pattern may also reflect a fault condition (if robot is enabled).

If a PCM does not see a healthy CAN bus it will blink the STATUS LED red (See User’s Guide for LED States).Īdditionally the PCM will not appear in Phoenix Tuner or will report loss of communication. The PCM must be connected to the CAN bus chain.
