Code Not Recognizing Second PCM

[alambert14]

I asked a question on here a while ago asking how to wire multiple PCMs, and I wired in in the can bus in series exactly how people said. As I can see on the roboRIO system configuration, the roboRIO recognizes both PCMs and has labeled them 0 and 1. However, when I upload our code to the roboRIO, and enable the robot, it says

Unhandled exception: edu.wpi.first.wpilibj.util.AllocationException: Solenoid channel 0 on module 1 is already allocated at [edu.wpi.first.wpilibj.Solenoid.initSolenoid(Soleno id.java:41)...

I have not allocated that channel anywhere in the code, and it gives the same error no matter what module ID I use or channel number.

Has anyone else had this same issue? Are the PCMs wired wrong? Thanks

[Joe Ross]

We are succesfully using two PCMs, with Java.

However, when I upload our code to the roboRIO, and enable the robot, it says

Unhandled exception: edu.wpi.first.wpilibj.util.AllocationException: Solenoid channel 0 on module 1 is already allocated at [edu.wpi.first.wpilibj.Solenoid.initSolenoid(Soleno id.java:41)...

I have not allocated that channel anywhere in the code, and it gives the same error no matter what module ID I use or channel number.


If you keep reading through the trace-back from the exception, it will show what line of your code it thinks is re-allocating channel 0 on module 1. It's possible it's somewhere in your code that you forgot about.

[alambert14]

We looked through all of our code and we are certain that it was not already allocated somewhere, especially since we had not previously had a second PCM ID in our RobotMap. In addition, it says that every single channel is already allocated.

[Joe Ross]

It's really hard to diagnose without the trace back and your code.