I'm trying to use the power line frequency vi in the niDCPower driver. If I use the Initialize with channels vi and define a single channel then I have no problems but if I try to define multiple channels then the PLF vi gives an error "BFFA0044 Channel or repeated capability name required." Can anyone explain why this vi gives this error when multiple channels are defined in the initialize phase? I checked the DC Power SFP and this attribute is only settable in one place and applies, as you would expect, to all channels so I'm a bit confused why this error occurs.
I'm using a 4140 but this issue can also be seen if you simulate this device. You can see this issue if you place the Initialize with channels.vi, configure power line frequency.vi and Close.vi on your block diagram, wire up the error and instrument handle clusters. Create a resource name constant on the initialize vi and a power line freq constant on the config vi. Create a channels control on the initialize vi and set it to 0 (single channel) now run this vi and you will see no error. Now change the channels value to 0:1 (two channels) and run it again, there's the error.
I have tried to replicate your problem and below is a snippet of the code that I used which gives error on running. I have used a simulated PXIe-4140. I am not sure if I'm missing out something, let me know.
Your code snippet is exactly what I have with the exception that I have an error cluster on the output of the close vi. Strangely I get an error every time I try to run with more than one channel defined. Maybe it's down to SW versions? I've listed mine below:-
Just to let you know I've updated to the latest versions of MAX and DC Power and the problem has gone so it was to do with SW versions somehow. Interesting that the upgrade notes do not mention this in the list of fixes the new version brings but anyway it's all good now.
