value sent to fpga pid setpoint changes over a long period of time

[bermea]

Hi,

I am using LabVIEW 8.6.1 with a cRIO-9073, I have noticed that the setpoint i send from the host.vi to the fpga.vi begins to increase after a long period of time (hours). That is at startup the host vi sends a setpoint value of 0 to the fpga pid setpoint (PID Temp SP) then after 8 hours the code is left running without any user interacting with the machine, the setpoint value increases to a value of 6. This will happen to other values I send to the fpga as well, i can eliminate this behaviour by rewriting the value to the fpga when it starts increasing, but I would prefer to avoid this method. Is there a more reliable way of writing or sending values to the FPGA, instead of using Read/Write Node on Host.vi?

Thank you, 

[A_Patel]

Hi bermea,

It is hard to believe that the number is increasing without a user input or code on your FPGA doing it. Can you have the Host VI log the values it is writing to the FPGA every 5 minutes?

Flash