Do NOT refer to some function by whatever you read on the icon. Use the actual function name.
Open that DAQ function and look at the code to see what it does. There is no such thing as a guide that defines a DAQmx equivalent for each and every traditional DAQ function or VI. If you haven't noticed yet, the traditional DAQ palette has items that are VIs that contain multiple subVIs. You really need to first understand what the original functions did before you start your rewrite. It is not going to be as simple as replacing one with another. For example, the single point update that you ask about would require you to place DAQmx create channel, timing, start task, write, and clear functions on your block diagram. The write function would be the only one placed inside a loop.
