Help With Multiple Tasks on cDAQ9184

I have a CDAQ9184 chassis with 3 different analog input modules installed. I read somewhere that I need a separate task for each type of module but when I try to do this, only one of the tasks (the last one to be created) actually runs.

I have tried reading all 3 modules within the one task but this doesnt work.

Can someone please tell me if I run 3 tasks on a cDAQ9184 chassis and if not, what should I do to read the three analog modules?

For info, I am using C++ and not LabView

Thanks