07-29-2007 02:53 AM
07-30-2007 07:03 AM
07-30-2007 07:33 AM
wsaall
You can send a screen shot or the VI that shows how you are placing the PID VIs together or with Multichannel mode. Generally speaking, the PID VIs are designed to work separated from each other or on multichannel model without interfering with each other.
Also, just to be sure, the versions of the PID Toolkit and/or LabVIEW RT module would help to identify the problem.
Now, answering your questions:
1. To use two PID with different parameters, you have to create an array with 2 elements, where the element 0 is for the channel 0 and element 1, channel 1 correspondently. If you just provide one set of gains and/or output ranges, it will assume that you want this values to be applied to all channels. So, you can have the same value of Output Range for all channels with only one element in the array and a different PID gains for each channel.
2. To determine the best PID parameters, please refer to PID literature available for tuning PID Controllers. In the PID Manual you would give some information about it.
Hope this helps...