Joss @ DMU

I'm a student studying at De Montfort University and currently trying to design a PID autotune programme to heat an element. The programme is designed using Visilogic and is for a V350-J-TRA22 controller. I have managed to display the temperature detected by a thermocouple on the HMI and the programme is almost exactly the same as the one shown in the 'PID' tutorials video on the Unitronics main site but when the controller is wired to an oscilloscope there is no output of any kind. Various combinations and checks have been carried out but nothing so far has worked. Does the autotune have to be carried out whilst the device is still connected to the PC and then the PID values entered manually or is this all done once the device has powered up automatically as it would suggest? I am new to Visilogic so if anyone could check over the programme (attached) to see if i have missed anything or direct me to someone who would, it would be much appreciated Joss test 25-30.vlp