From the file attached, I am having difficulty seeing exactly how you are trying to control each axis. You have three loops which run in parallel generating data. Note these loops don't actually output data, this data won't get output until the DAQmx Assistant VI's execute. If you are going to use three separate tasks (3 separate instances of the DAQmx Assistant), then you need to ensure that none of these are allowed to execute in parallel. As I mentioned in my previous post these three channels share a single timing controller and FIFO. Once one task is running, these resources will not be available to any other task until the first task has completed. Your other option is to place all three channels in the same task. You can then independently control each axis by changing what data is written which which channel.
As a simple example, let's say I wanted to move along the X axis, then Y axis, then Z axis. My data might look something like this (I will assume 0 V means no motion, 1 V causes motion):
Channel 0 (X Axis): 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Channel 1 (Y Axis): 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
Channel 2 (Z Axis: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
This allows me to have a single task which uses all three of these channels. I write and output to all three at the same time. However, the pattern of data I write, allows me to control when each axis moves relative to the others.
I hope that helps,
Dan
