Your question is Troubleshoot CAN or Modbus Failures. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you troubleshoot a communication failure between an industrial PC and an embedded sensor over a CAN bus or Modbus protocol at J. B Poindexter &?